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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[API Reference](/docs/pages/api-reference)next.config.js Options next.config.js Options ====================== Next.js can be configured through a `next.config.js` file in the root of your project directory (for example, by `package.json`) with a default export. next.config.js // @ts-check /** @type {import('next').NextConfig} */ const nextConfig = { /* config options here */ } module.exports = nextConfig `next.config.js` is a regular Node.js module, not a JSON file. It gets used by the Next.js server and build phases, and it's not included in the browser build. If you need [ECMAScript modules](https://nodejs.org/api/esm.html), you can use `next.config.mjs`: next.config.mjs // @ts-check /** * @type {import('next').NextConfig} */ const nextConfig = { /* config options here */ } export default nextConfig You can also use a function: next.config.mjs // @ts-check export default (phase, { defaultConfig }) => { /** * @type {import('next').NextConfig} */ const nextConfig = { /* config options here */ } return nextConfig } Since Next.js 12.1.0, you can use an async function: next.config.js // @ts-check module.exports = async (phase, { defaultConfig }) => { /** * @type {import('next').NextConfig} */ const nextConfig = { /* config options here */ } return nextConfig } `phase` is the current context in which the configuration is loaded. You can see the [available phases](https://github.com/vercel/next.js/blob/5e6b008b561caf2710ab7be63320a3d549474a5b/packages/next/shared/lib/constants.ts#L19-L23). Phases can be imported from `next/constants`: // @ts-check const { PHASE_DEVELOPMENT_SERVER } = require('next/constants') module.exports = (phase, { defaultConfig }) => { if (phase === PHASE_DEVELOPMENT_SERVER) { return { /* development only config options here */ } } return { /* config options for all phases except development here */ } } The commented lines are the place where you can put the configs allowed by `next.config.js`, which are [defined in this file](https://github.com/vercel/next.js/blob/canary/packages/next/src/server/config-shared.ts). However, none of the configs are required, and it's not necessary to understand what each config does. Instead, search for the features you need to enable or modify in this section and they will show you what to do. > Avoid using new JavaScript features not available in your target Node.js version. `next.config.js` will not be parsed by Webpack, Babel or TypeScript. This page documents all the available configuration options: [ ### assetPrefix Learn how to use the assetPrefix config option to configure your CDN. ](/docs/pages/api-reference/next-config-js/assetPrefix)[ ### basePath Use \`basePath\` to deploy a Next.js application under a sub-path of a domain. ](/docs/pages/api-reference/next-config-js/basePath)[ ### compress Next.js provides gzip compression to compress rendered content and static files, it only works with the server target. Learn more about it here. ](/docs/pages/api-reference/next-config-js/compress)[ ### crossOrigin Use the \`crossOrigin\` option to add a crossOrigin tag on the \`script\` tags generated by \`next/script\` and \`next/head\`. ](/docs/pages/api-reference/next-config-js/crossOrigin)[ ### devIndicators Optimized pages include an indicator to let you know if it's being statically optimized. You can opt-out of it here. ](/docs/pages/api-reference/next-config-js/devIndicators)[ ### distDir Set a custom build directory to use instead of the default .next directory. ](/docs/pages/api-reference/next-config-js/distDir)[ ### env Learn to add and access environment variables in your Next.js application at build time. ](/docs/pages/api-reference/next-config-js/env)[ ### eslint Next.js reports ESLint errors and warnings during builds by default. Learn how to opt-out of this behavior here. ](/docs/pages/api-reference/next-config-js/eslint)[ ### exportPathMap Customize the pages that will be exported as HTML files when using \`next export\`. ](/docs/pages/api-reference/next-config-js/exportPathMap)[ ### generateBuildId Configure the build id, which is used to identify the current build in which your application is being served. ](/docs/pages/api-reference/next-config-js/generateBuildId)[ ### generateEtags Next.js will generate etags for every page by default. Learn more about how to disable etag generation here. ](/docs/pages/api-reference/next-config-js/generateEtags)[ ### headers Add custom HTTP headers to your Next.js app. ](/docs/pages/api-reference/next-config-js/headers)[ ### httpAgentOptions Next.js will automatically use HTTP Keep-Alive by default. Learn more about how to disable HTTP Keep-Alive here. ](/docs/pages/api-reference/next-config-js/httpAgentOptions)[ ### images Custom configuration for the next/image loader ](/docs/pages/api-reference/next-config-js/images)[ ### instrumentationHook Use the instrumentationHook option to set up instrumentation in your Next.js App. ](/docs/pages/api-reference/next-config-js/instrumentationHook)[ ### onDemandEntries Configure how Next.js will dispose and keep in memory pages created in development. ](/docs/pages/api-reference/next-config-js/onDemandEntries)[ ### optimizePackageImports API Reference for optmizedPackageImports Next.js Config Option ](/docs/pages/api-reference/next-config-js/optimizePackageImports)[ ### output Next.js automatically traces which files are needed by each page to allow for easy deployment of your application. Learn how it works here. ](/docs/pages/api-reference/next-config-js/output)[ ### pageExtensions Extend the default page extensions used by Next.js when resolving pages in the Pages Router. ](/docs/pages/api-reference/next-config-js/pageExtensions)[ ### poweredByHeader Next.js will add the \`x-powered-by\` header by default. Learn to opt-out of it here. ](/docs/pages/api-reference/next-config-js/poweredByHeader)[ ### productionBrowserSourceMaps Enables browser source map generation during the production build. ](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps)[ ### reactStrictMode The complete Next.js runtime is now Strict Mode-compliant, learn how to opt-in ](/docs/pages/api-reference/next-config-js/reactStrictMode)[ ### redirects Add redirects to your Next.js app. ](/docs/pages/api-reference/next-config-js/redirects)[ ### rewrites Add rewrites to your Next.js app. ](/docs/pages/api-reference/next-config-js/rewrites)[ ### Runtime Config Add client and server runtime configuration to your Next.js app. ](/docs/pages/api-reference/next-config-js/runtime-configuration)[ ### trailingSlash Configure Next.js pages to resolve with or without a trailing slash. ](/docs/pages/api-reference/next-config-js/trailingSlash)[ ### transpilePackages Automatically transpile and bundle dependencies from local packages (like monorepos) or from external dependencies (\`node\_modules\`). ](/docs/pages/api-reference/next-config-js/transpilePackages)[ ### turbo Configure Next.js with Turbopack-specific options ](/docs/pages/api-reference/next-config-js/turbo)[ ### typescript Next.js reports TypeScript errors by default. Learn to opt-out of this behavior here. ](/docs/pages/api-reference/next-config-js/typescript)[ ### urlImports Configure Next.js to allow importing modules from external URLs (experimental). ](/docs/pages/api-reference/next-config-js/urlImports)[ ### webpack Learn how to customize the webpack config used by Next.js ](/docs/pages/api-reference/next-config-js/webpack)[ ### webVitalsAttribution Learn how to use the webVitalsAttribution option to pinpoint the source of Web Vitals issues. ](/docs/pages/api-reference/next-config-js/webVitalsAttribution) [Previous userAgent ](/docs/pages/api-reference/functions/userAgent) [Next assetPrefix ](/docs/pages/api-reference/next-config-js/assetPrefix) Was this helpful? supported. Send

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webpack configuration to your application make sure Next.js doesn't already support your use-case: * [CSS imports](/docs/pages/building-your-application/styling) * [CSS modules](/docs/pages/building-your-application/styling/css-modules) * [Sass/SCSS imports](/docs/pages/building-your-application/styling/sass) * [Sass/SCSS modules](/docs/pages/building-your-application/styling/sass) * [Customizing babel configuration](/docs/pages/building-your-application/configuring/babel) Some commonly asked for features are available as plugins: * [@next/mdx](https://github.com/vercel/next.js/tree/canary/packages/next-mdx) * [@next/bundle-analyzer](https://github.com/vercel/next.js/tree/canary/packages/next-bundle-analyzer) In order to extend our usage of `webpack`, you can define a function that extends its config inside `next.config.js`, like so: next.config.js module.exports = { webpack: ( config, { buildId, dev, isServer, defaultLoaders, nextRuntime, webpack } ) => { // Important: return the 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Development](#development) * [Turbopack](#turbopack) * [HTTPS for Local Development](#https-for-local-development) * [Build](#build) * [Debug](#debug) * [Linting](#linting) * [Mangling](#mangling) * [Profiling](#profiling) * [Production](#production) * [Keep Alive Timeout](#keep-alive-timeout) * [Info](#info) * [Lint](#lint) * [Telemetry](#telemetry) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/05-next-cli.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[API Reference](/docs/pages/api-reference)Next.js CLI Next.js CLI =========== The Next.js CLI allows you to develop, build, start your application, and more. To get a list of the available CLI commands, run the following command inside your project directory: Terminal next -h The output should look like this: Terminal Usage next [options] [command] The Next.js CLI allows you to develop, build, start your application, and more. Options: -v, --version Outputs the Next.js version. -h, --help Displays this message. Commands: build [directory] [options] Creates an optimized production build of your application. The output displays information about each route. dev [directory] [options] Starts Next.js in development mode with hot-code reloading, error reporting, and more. info [options] Prints relevant details about the current system which can be used to report Next.js bugs. lint [directory] [options] Runs ESLint for all files in the `/src`, `/app`, `/pages`, `/components`, and `/lib` directories. It also provides a guided setup to install any required dependencies if ESLint is not already configured in your application. start [directory] [options] Starts Next.js in production mode. The application should be compiled with `next build` first. telemetry [options] Allows you to enable or disable Next.js' completely anonymous telemetry collection. You can pass any [node arguments](https://nodejs.org/api/cli.html#cli_node_options_options) to `next` commands: Terminal NODE_OPTIONS='--throw-deprecation' next NODE_OPTIONS='-r esm' next NODE_OPTIONS='--inspect' next > **Good to know**: Running `next` without a command is the same as running `next dev` [Development](#development) --------------------------- `next dev` starts the application in development mode with hot-code reloading, error reporting, and more. To get a list of the available options with `next dev`, run the following command inside your project directory: Terminal next dev -h The output should look like this: Terminal Usage: next dev [directory] [options] Starts Next.js in development mode with hot-code reloading, error reporting, and more. Arguments: [directory] A directory on which to build the application. If no directory is provided, the current directory will be used. Options: --turbo Starts development mode using Turbopack (beta). -p, --port <port> Specify a port number on which to start the application. (default: 3000, env: PORT) -H, --hostname <hostname> Specify a hostname on which to start the application (default: 0.0.0.0). --experimental-https Starts the server with HTTPS and generates a self-signed certificate. --experimental-https-key, <path> Path to a HTTPS key file. --experimental-https-cert, <path> Path to a HTTPS certificate file. --experimental-https-ca, <path> Path to a HTTPS certificate authority file. --experimental-upload-trace, <traceUrl> Reports a subset of the debugging trace to a remote HTTP URL. Includes sensitive data. -h, --help Displays this message. The application will start at `http://localhost:3000` by default. The default port can be changed with `-p`, like so: Terminal next dev -p 4000 Or using the `PORT` environment variable: Terminal PORT=4000 next dev > **Good to know**: > > * `PORT` cannot be set in `.env` as booting up the HTTP server happens before any other code is initialized. > * Next.js will automatically retry with another port until a port is available if a port is not specified with the CLI option `--port` or the `PORT` environment variable. You can also set the hostname to be different from the default of `0.0.0.0`, this can be useful for making the application available for other devices on the network. The default hostname can be changed with `-H`, like so: Terminal next dev -H 192.168.1.2 ### [Turbopack](#turbopack) [Turbopack](/docs/architecture/turbopack) (beta), our new bundler, which is being tested and stabilized in Next.js, helps speed up local iterations while working on your application. To use Turbopack in development mode, add the `--turbo` option: Terminal next dev --turbo ### [HTTPS for Local Development](#https-for-local-development) For certain use cases like webhooks or authentication, it may be required to use HTTPS to have a secure environment on `localhost`. Next.js can generate a self-signed certificate with `next dev` as follows: Terminal next dev --experimental-https You can also provide a custom certificate and key with `--experimental-https-key` and `--experimental-https-cert`. Optionally, you can provide a custom CA certificate with `--experimental-https-ca` as well. Terminal next dev --experimental-https --experimental-https-key ./certificates/localhost-key.pem --experimental-https-cert ./certificates/localhost.pem `next dev --experimental-https` is only intended for development and creates a locally-trusted certificate with `mkcert`. In production, use properly issued certificates from trusted authorities. When deploying to Vercel, HTTPS is [automatically configured](https://vercel.com/docs/security/encryption) for your Next.js application. [Build](#build) --------------- `next build` creates an optimized production build of your application. The output displays information about each route: Terminal Route (app) Size First Load JS ┌ ○ / 5.3 kB 89.5 kB ├ ○ /_not-found 885 B 85.1 kB └ ○ /about 137 B 84.4 kB + First Load JS shared by all 84.2 kB ├ chunks/184-d3bb186aac44da98.js 28.9 kB ├ chunks/30b509c0-f3503c24f98f3936.js 53.4 kB └ other shared chunks (total) ○ (Static) prerendered as static content * **Size**: The number of assets downloaded when navigating to the page client-side. The size for each route only includes its dependencies. * **First Load JS**: The number of assets downloaded when visiting the page from the server. The amount of JS shared by all is shown as a separate metric. Both of these values are [**compressed with gzip**](/docs/app/api-reference/next-config-js/compress). The first load is indicated by green, yellow, or red. Aim for green for performant applications. To get a list of the available options with `next build`, run the following command inside your project directory: Terminal next build -h The output should look like this: Terminal Usage: next build [directory] [options] Creates an optimized production build of your application. The output displays information about each route. Arguments: [directory] A directory on which to build the application. If no provided, the current directory will be used. Options: -d, --debug Enables a more verbose build output. --profile Enables production profiling for React. --no-lint Disables linting. --no-mangling Disables mangling. --experimental-app-only Builds only App Router routes. --experimental-build-mode [mode] Uses an experimental build mode. (choices: "compile" "generate", default: "default") -h, --help Displays this message. ### [Debug](#debug) You can enable more verbose build output with the `--debug` flag in `next build`. Terminal next build --debug With this flag enabled additional build output like rewrites, redirects, and headers will be shown. ### [Linting](#linting) You can disable linting for builds like so: Terminal next build --no-lint ### [Mangling](#mangling) You can disable [mangling](https://en.wikipedia.org/wiki/Name_mangling) for builds like so: Terminal next build --no-mangling > **Good to know**: This may affect performance and should only be used for debugging purposes. ### [Profiling](#profiling) You can enable production profiling for React with the `--profile` flag in `next build`. Terminal next build --profile After that, you can use the profiler in the same way as you would in development. [Production](#production) ------------------------- `next start` starts the application in production mode. The application should be compiled with [`next build`](#build) first. To get a list of the available options with `next start`, run the follow command inside your project directory: Terminal next start -h The output should look like this: Terminal Usage: next start [directory] [options] Starts Next.js in production mode. The application should be compiled with `next build` first. Arguments: [directory] A directory on which to start the application. If not directory is provided, the current directory will be used. Options: -p, --port <port> Specify a port number on which to start the application. (default: 3000, env: PORT) -H, --hostname <hostname> Specify a hostname on which to start the application (default: 0.0.0.0). --keepAliveTimeout <keepAliveTimeout> Specify the maximum amount of milliseconds to wait before closing the inactive connections. -h, --help Displays this message. The application will start at `http://localhost:3000` by default. The default port can be changed with `-p`, like so: Terminal next start -p 4000 Or using the `PORT` environment variable: Terminal PORT=4000 next start > **Good to know**: > > * `PORT` cannot be set in `.env` as booting up the HTTP server happens before any other code is initialized. > * `next start` cannot be used with `output: 'standalone'` or `output: 'export'`. ### [Keep Alive Timeout](#keep-alive-timeout) When deploying Next.js behind a downstream proxy (e.g. a load-balancer like AWS ELB/ALB) it's important to configure Next's underlying HTTP server with [keep-alive timeouts](https://nodejs.org/api/http.html#http_server_keepalivetimeout) that are _larger_ than the downstream proxy's timeouts. Otherwise, once a keep-alive timeout is reached for a given TCP connection, Node.js will immediately terminate that connection without notifying the downstream proxy. This results in a proxy error whenever it attempts to reuse a connection that Node.js has already terminated. To configure the timeout values for the production Next.js server, pass `--keepAliveTimeout` (in milliseconds) to `next start`, like so: Terminal next start --keepAliveTimeout 70000 [Info](#info) ------------- `next info` prints relevant details about the current system which can be used to report Next.js bugs. This information includes Operating System platform/arch/version, Binaries (Node.js, npm, Yarn, pnpm) and npm package versions (`next`, `react`, `react-dom`). To get a list of the available options with `next info`, run the following command inside your project directory: Terminal next info -h The output should look like this: Terminal Usage: next info [options] Prints relevant details about the current system which can be used to report Next.js bugs. Options: --verbose Collections additional information for debugging. -h, --help Displays this message. Running `next info` will give you information like this example: Terminal Operating System: Platform: linux Arch: x64 Version: #22-Ubuntu SMP Fri Nov 5 13:21:36 UTC 2021 Available memory (MB): 31795 Available CPU cores: 16 Binaries: Node: 16.13.0 npm: 8.1.0 Yarn: 1.22.17 pnpm: 6.24.2 Relevant Packages: next: 14.1.1-canary.61 // Latest available version is detected (14.1.1-canary.61). react: 18.2.0 react-dom: 18.2.0 Next.js Config: output: N/A This information should then be pasted into GitHub Issues. You can also run `next info --verbose` which will print additional information about the system and the installation of packages related to `next`. [Lint](#lint) ------------- `next lint` runs ESLint for all files in the `pages/`, `app/`, `components/`, `lib/`, and `src/` directories. It also provides a guided setup to install any required dependencies if ESLint is not already configured in your application. To get a list of the available options with `next lint`, run the following command inside your project directory: Terminal next lint -h The output should look like this: Terminal Usage: next lint [directory] [options] Runs ESLint for all files in the `/src`, `/app`, `/pages`, `/components`, and `/lib` directories. It also provides a guided setup to install any required dependencies if ESLint is not already configured in your application. Arguments: [directory] A base directory on which to lint the application. If no directory is provided, the current directory will be used. Options: -d, --dir, <dirs...> Include directory, or directories, to run ESLint. --file, <files...> Include file, or files, to run ESLint. --ext, [exts...] Specify JavaScript file extensions. (default: [".js", ".mjs", ".cjs", ".jsx", ".ts", ".mts", ".cts", ".tsx"]) -c, --config, <config> Uses this configuration file, overriding all other configuration options. --resolve-plugins-relative-to, <rprt> Specify a directory where plugins should be resolved from. --strict Creates a `.eslintrc.json` file using the Next.js strict configuration. --rulesdir, <rulesdir...> Uses additional rules from this directory(s). --fix Automatically fix linting issues. --fix-type <fixType> Specify the types of fixes to apply (e.g., problem, suggestion, layout). --ignore-path <path> Specify a file to ignore. --no-ignore <path> Disables the `--ignore-path` option. --quiet Reports errors only. --max-warnings [maxWarnings] Specify the number of warnings before triggering a non-zero exit code. (default: -1) -o, --output-file, <outputFile> Specify a file to write report to. -f, --format, <format> Uses a specifc output format. --no-inline-config Prevents comments from changing config or rules. --report-unused-disable-directives-severity <level> Specify severity level for unused eslint-disable directives. (choices: "error", "off", "warn") --no-cache Disables caching. --cache-location, <cacheLocation> Specify a location for cache. --cache-strategy, [cacheStrategy] Specify a strategy to use for detecting changed files in the cache. (default: "metadata") --error-on-unmatched-pattern Reports errors when any file patterns are unmatched. -h, --help Displays this message. If you have other directories that you would like to lint, you can specify them using the `--dir` flag: Terminal next lint --dir utils For more information on the other options, check out our [ESLint](/docs/app/building-your-application/configuring/eslint) configuration documentation. [Telemetry](#telemetry) ----------------------- Next.js collects **completely anonymous** telemetry data about general usage. Participation in this anonymous program is optional, and you may opt-out if you'd not like to share any information. To get a list of the available options with `next telemetry`, run the following command in your project directory: Terminal next telemetry -h The output should look like this: Terminal Usage: next telemetry [options] Allows you to enable or disable Next.js' completely anonymous telemetry collection. Options: --enable Eanbles Next.js' telemetry collection. --disable Disables Next.js' telemetry collection. -h, --help Displays this message. Learn more: https://nextjs.org/telemetry Learn more about [Telemetry](/telemetry). [Previous create-next-app ](/docs/pages/api-reference/create-next-app) [Next Edge Runtime ](/docs/pages/api-reference/edge) Was this helpful? supported. Send

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CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/webVitalsAttribution.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)webVitalsAttribution webVitalsAttribution ==================== When debugging issues related to Web Vitals, it is often helpful if we can pinpoint the source of the problem. For example, in the case of Cumulative Layout Shift (CLS), we might want to know the first element that shifted when the single largest layout shift occurred. Or, in the case of Largest Contentful Paint (LCP), we might want to identify the element corresponding to the LCP for the page. If the LCP element is an image, knowing the URL of the image resource can help us locate the asset we need to optimize. Pinpointing the biggest contributor to the Web Vitals score, aka [attribution](https://github.com/GoogleChrome/web-vitals/blob/4ca38ae64b8d1e899028c692f94d4c56acfc996c/README.md#attribution), allows us to obtain more in-depth information like entries for [PerformanceEventTiming](https://developer.mozilla.org/docs/Web/API/PerformanceEventTiming), [PerformanceNavigationTiming](https://developer.mozilla.org/docs/Web/API/PerformanceNavigationTiming) and [PerformanceResourceTiming](https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming). Attribution is disabled by default in Next.js but can be enabled **per metric** by specifying the following in `next.config.js`. next.config.js experimental: { webVitalsAttribution: ['CLS', 'LCP'] } Valid attribution values are all `web-vitals` metrics specified in the [`NextWebVitalsMetric`](https://github.com/vercel/next.js/blob/442378d21dd56d6e769863eb8c2cb521a463a2e0/packages/next/shared/lib/utils.ts#L43) type. [Previous webpack ](/docs/pages/api-reference/next-config-js/webpack) [Next create-next-app ](/docs/pages/api-reference/create-next-app) Was this helpful? supported. Send

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[<Link>](/docs/app/api-reference/components/link) * [<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, 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[useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * 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[turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Interactive](#interactive) * [Non-interactive](#non-interactive) * [Why use Create Next App?](#why-use-create-next-app) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/04-create-next-app.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[API Reference](/docs/pages/api-reference)create-next-app create-next-app =============== The easiest way to get started with Next.js is by using `create-next-app`. This CLI tool enables you to quickly start building a new Next.js application, with everything set up for you. You can create a new app using the default Next.js template, or by using one of the [official Next.js examples](https://github.com/vercel/next.js/tree/canary/examples). ### [Interactive](#interactive) You can create a new project interactively by running: Terminal npx create-next-app@latest Terminal yarn create next-app Terminal pnpm create next-app Terminal bunx create-next-app You will then be asked the following prompts: Terminal What is your project named? my-app Would you like to use TypeScript? No / Yes Would you like to use ESLint? No / Yes Would you like to use Tailwind CSS? No / Yes Would you like to use `src/` directory? No / Yes Would you like to use App Router? (recommended) No / Yes Would you like to customize the default import alias (@/*)? No / Yes Once you've answered the prompts, a new project will be created with the correct configuration depending on your answers. ### [Non-interactive](#non-interactive) You can also pass command line arguments to set up a new project non-interactively. Further, you can negate default options by prefixing them with `--no-` (e.g. `--no-eslint`). See `create-next-app --help`: Terminal Usage: create-next-app <project-directory> [options] Options: -V, --version output the version number --ts, --typescript Initialize as a TypeScript project. (default) --js, --javascript Initialize as a JavaScript project. --tailwind Initialize with Tailwind CSS config. (default) --eslint Initialize with ESLint config. --app Initialize as an App Router project. --src-dir Initialize inside a `src/` directory. --import-alias <alias-to-configure> Specify import alias to use (default "@/*"). --use-npm Explicitly tell the CLI to bootstrap the app using npm --use-pnpm Explicitly tell the CLI to bootstrap the app using pnpm --use-yarn Explicitly tell the CLI to bootstrap the app using Yarn --use-bun Explicitly tell the CLI to bootstrap the app using Bun -e, --example [name]|[github-url] An example to bootstrap the app with. You can use an example name from the official Next.js repo or a public GitHub URL. The URL can use any branch and/or subdirectory --example-path <path-to-example> In a rare case, your GitHub URL might contain a branch name with a slash (e.g. bug/fix-1) and the path to the example (e.g. foo/bar). In this case, you must specify the path to the example separately: --example-path foo/bar --reset-preferences Explicitly tell the CLI to reset any stored preferences -h, --help output usage information ### [Why use Create Next App?](#why-use-create-next-app) `create-next-app` allows you to create a new Next.js app within seconds. It is officially maintained by the creators of Next.js, and includes a number of benefits: * **Interactive Experience**: Running `npx create-next-app@latest` (with no arguments) launches an interactive experience that guides you through setting up a project. * **Zero Dependencies**: Initializing a project is as quick as one second. Create Next App has zero dependencies. * **Offline Support**: Create Next App will automatically detect if you're offline and bootstrap your project using your local package cache. * **Support for Examples**: Create Next App can bootstrap your application using an example from the Next.js examples collection (e.g. `npx create-next-app --example api-routes`) or any public GitHub repository. * **Tested**: The package is part of the Next.js monorepo and tested using the same integration test suite as Next.js itself, ensuring it works as expected with every release. [Previous webVitalsAttribution ](/docs/pages/api-reference/next-config-js/webVitalsAttribution) [Next Next.js CLI ](/docs/pages/api-reference/next-cli) Was this helpful? supported. Send

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[reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Network APIs](#network-apis) * [Encoding APIs](#encoding-apis) * [Stream APIs](#stream-apis) * [Crypto APIs](#crypto-apis) * [Web Standard APIs](#web-standard-apis) * [Next.js Specific Polyfills](#nextjs-specific-polyfills) * [Environment Variables](#environment-variables) * [Unsupported APIs](#unsupported-apis) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/06-edge.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[API Reference](/docs/pages/api-reference)Edge Runtime Edge Runtime ============ The Next.js Edge Runtime is based on standard Web APIs, it supports the following APIs: [Network APIs](#network-apis) ----------------------------- API Description [`Blob`](https://developer.mozilla.org/docs/Web/API/Blob) Represents a blob [`fetch`](https://developer.mozilla.org/docs/Web/API/Fetch_API) Fetches a resource [`FetchEvent`](https://developer.mozilla.org/docs/Web/API/FetchEvent) Represents a fetch event [`File`](https://developer.mozilla.org/docs/Web/API/File) Represents a file [`FormData`](https://developer.mozilla.org/docs/Web/API/FormData) Represents form data [`Headers`](https://developer.mozilla.org/docs/Web/API/Headers) Represents HTTP headers [`Request`](https://developer.mozilla.org/docs/Web/API/Request) Represents an HTTP request [`Response`](https://developer.mozilla.org/docs/Web/API/Response) Represents an HTTP response [`URLSearchParams`](https://developer.mozilla.org/docs/Web/API/URLSearchParams) Represents URL search parameters [`WebSocket`](https://developer.mozilla.org/docs/Web/API/WebSocket) Represents a websocket connection [Encoding APIs](#encoding-apis) ------------------------------- API Description [`atob`](https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/atob) Decodes a base-64 encoded string [`btoa`](https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/btoa) Encodes a string in base-64 [`TextDecoder`](https://developer.mozilla.org/docs/Web/API/TextDecoder) Decodes a Uint8Array into a string [`TextDecoderStream`](https://developer.mozilla.org/docs/Web/API/TextDecoderStream) Chainable decoder for streams [`TextEncoder`](https://developer.mozilla.org/docs/Web/API/TextEncoder) Encodes a string into a Uint8Array [`TextEncoderStream`](https://developer.mozilla.org/docs/Web/API/TextEncoderStream) Chainable encoder for streams [Stream APIs](#stream-apis) --------------------------- API Description [`ReadableStream`](https://developer.mozilla.org/docs/Web/API/ReadableStream) Represents a readable stream [`ReadableStreamBYOBReader`](https://developer.mozilla.org/docs/Web/API/ReadableStreamBYOBReader) Represents a reader of a ReadableStream [`ReadableStreamDefaultReader`](https://developer.mozilla.org/docs/Web/API/ReadableStreamDefaultReader) Represents a reader of a ReadableStream [`TransformStream`](https://developer.mozilla.org/docs/Web/API/TransformStream) Represents a transform stream [`WritableStream`](https://developer.mozilla.org/docs/Web/API/WritableStream) Represents a writable stream [`WritableStreamDefaultWriter`](https://developer.mozilla.org/docs/Web/API/WritableStreamDefaultWriter) Represents a writer of a WritableStream [Crypto APIs](#crypto-apis) --------------------------- API Description [`crypto`](https://developer.mozilla.org/docs/Web/API/Window/crypto) Provides access to the cryptographic functionality of the platform [`CryptoKey`](https://developer.mozilla.org/docs/Web/API/CryptoKey) Represents a cryptographic key [`SubtleCrypto`](https://developer.mozilla.org/docs/Web/API/SubtleCrypto) Provides access to common cryptographic primitives, like hashing, signing, encryption or decryption [Web Standard APIs](#web-standard-apis) --------------------------------------- API Description [`AbortController`](https://developer.mozilla.org/docs/Web/API/AbortController) Allows you to abort one or more DOM requests as and when desired [`Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array) Represents an array of values [`ArrayBuffer`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) Represents a generic, fixed-length raw binary data buffer [`Atomics`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Atomics) Provides atomic operations as static methods [`BigInt`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/BigInt) Represents a whole number with arbitrary precision [`BigInt64Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array) Represents a typed array of 64-bit signed integers [`BigUint64Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array) Represents a typed array of 64-bit unsigned integers [`Boolean`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean) Represents a logical entity and can have two values: `true` and `false` [`clearInterval`](https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/clearInterval) Cancels a timed, repeating action which was previously established by a call to `setInterval()` [`clearTimeout`](https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/clearTimeout) Cancels a timed, repeating action which was previously established by a call to `setTimeout()` [`console`](https://developer.mozilla.org/docs/Web/API/Console) Provides access to the browser's debugging console [`DataView`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/DataView) Represents a generic view of an `ArrayBuffer` [`Date`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Date) Represents a single moment in time in a platform-independent format [`decodeURI`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/decodeURI) Decodes a Uniform Resource Identifier (URI) previously created by `encodeURI` or by a similar routine [`decodeURIComponent`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent) Decodes a Uniform Resource Identifier (URI) component previously created by `encodeURIComponent` or by a similar routine [`DOMException`](https://developer.mozilla.org/docs/Web/API/DOMException) Represents an error that occurs in the DOM [`encodeURI`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/encodeURI) Encodes a Uniform Resource Identifier (URI) by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character [`encodeURIComponent`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent) Encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character [`Error`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error) Represents an error when trying to execute a statement or accessing a property [`EvalError`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/EvalError) Represents an error that occurs regarding the global function `eval()` [`Float32Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Float32Array) Represents a typed array of 32-bit floating point numbers [`Float64Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Float64Array) Represents a typed array of 64-bit floating point numbers [`Function`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function) Represents a function [`Infinity`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Infinity) Represents the mathematical Infinity value [`Int8Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Int8Array) Represents a typed array of 8-bit signed integers [`Int16Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Int16Array) Represents a typed array of 16-bit signed integers [`Int32Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Int32Array) Represents a typed array of 32-bit signed integers [`Intl`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl) Provides access to internationalization and localization functionality [`isFinite`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/isFinite) Determines whether a value is a finite number [`isNaN`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/isNaN) Determines whether a value is `NaN` or not [`JSON`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/JSON) Provides functionality to convert JavaScript values to and from the JSON format [`Map`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map) Represents a collection of values, where each value may occur only once [`Math`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Math) Provides access to mathematical functions and constants [`Number`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number) Represents a numeric value [`Object`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object) Represents the object that is the base of all JavaScript objects [`parseFloat`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/parseFloat) Parses a string argument and returns a floating point number [`parseInt`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/parseInt) Parses a string argument and returns an integer of the specified radix [`Promise`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise) Represents the eventual completion (or failure) of an asynchronous operation, and its resulting value [`Proxy`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Proxy) Represents an object that is used to define custom behavior for fundamental operations (e.g. property lookup, assignment, enumeration, function invocation, etc) [`queueMicrotask`](https://developer.mozilla.org/docs/Web/API/queueMicrotask) Queues a microtask to be executed [`RangeError`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RangeError) Represents an error when a value is not in the set or range of allowed values [`ReferenceError`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError) Represents an error when a non-existent variable is referenced [`Reflect`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Reflect) Provides methods for interceptable JavaScript operations [`RegExp`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp) Represents a regular expression, allowing you to match combinations of characters [`Set`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Set) Represents a collection of values, where each value may occur only once [`setInterval`](https://developer.mozilla.org/docs/Web/API/setInterval) Repeatedly calls a function, with a fixed time delay between each call [`setTimeout`](https://developer.mozilla.org/docs/Web/API/setTimeout) Calls a function or evaluates an expression after a specified number of milliseconds [`SharedArrayBuffer`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) Represents a generic, fixed-length raw binary data buffer [`String`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String) Represents a sequence of characters [`structuredClone`](https://developer.mozilla.org/docs/Web/API/Web_Workers_API/Structured_clone_algorithm) Creates a deep copy of a value [`Symbol`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol) Represents a unique and immutable data type that is used as the key of an object property [`SyntaxError`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/SyntaxError) Represents an error when trying to interpret syntactically invalid code [`TypeError`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/TypeError) Represents an error when a value is not of the expected type [`Uint8Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) Represents a typed array of 8-bit unsigned integers [`Uint8ClampedArray`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray) Represents a typed array of 8-bit unsigned integers clamped to 0-255 [`Uint32Array`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array) Represents a typed array of 32-bit unsigned integers [`URIError`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/URIError) Represents an error when a global URI handling function was used in a wrong way [`URL`](https://developer.mozilla.org/docs/Web/API/URL) Represents an object providing static methods used for creating object URLs [`URLPattern`](https://developer.mozilla.org/docs/Web/API/URLPattern) Represents a URL pattern [`URLSearchParams`](https://developer.mozilla.org/docs/Web/API/URLSearchParams) Represents a collection of key/value pairs [`WeakMap`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakMap) Represents a collection of key/value pairs in which the keys are weakly referenced [`WeakSet`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakSet) Represents a collection of objects in which each object may occur only once [`WebAssembly`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly) Provides access to WebAssembly [Next.js Specific Polyfills](#nextjs-specific-polyfills) -------------------------------------------------------- * [`AsyncLocalStorage`](https://nodejs.org/api/async_context.html#class-asynclocalstorage) [Environment Variables](#environment-variables) ----------------------------------------------- You can use `process.env` to access [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) for both `next dev` and `next build`. [Unsupported APIs](#unsupported-apis) ------------------------------------- The Edge Runtime has some restrictions including: * Native Node.js APIs **are not supported**. For example, you can't read or write to the filesystem. * `node_modules` _can_ be used, as long as they implement ES Modules and do not use native Node.js APIs. * Calling `require` directly is **not allowed**. Use ES Modules instead. The following JavaScript language features are disabled, and **will not work:** API Description [`eval`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/eval) Evaluates JavaScript code represented as a string [`new Function(evalString)`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function) Creates a new function with the code provided as an argument [`WebAssembly.compile`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/compile) Compiles a WebAssembly module from a buffer source [`WebAssembly.instantiate`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiate) Compiles and instantiates a WebAssembly module from a buffer source In rare cases, your code could contain (or import) some dynamic code evaluation statements which _can not be reached at runtime_ and which can not be removed by treeshaking. You can relax the check to allow specific files with your Middleware or Edge API Route exported configuration: export const config = { runtime: 'edge', // for Edge API Routes only unstable_allowDynamic: [ // allows a single file '/lib/utilities.js', // use a glob to allow anything in the function-bind 3rd party module '/node_modules/function-bind/**', ], } `unstable_allowDynamic` is a [glob](https://github.com/micromatch/micromatch#matching-features), or an array of globs, ignoring dynamic code evaluation for specific files. The globs are relative to your application root folder. Be warned that if these statements are executed on the Edge, _they will throw and cause a runtime error_. [Previous Next.js CLI ](/docs/pages/api-reference/next-cli) [Next Architecture ](/docs/architecture) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Adding a trailing slash](#adding-a-trailing-slash) * [Customizing the output directory](#customizing-the-output-directory) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/exportPathMap.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)exportPathMap exportPathMap ============= > This feature is exclusive to `next export` and currently **deprecated** in favor of `getStaticPaths` with `pages` or `generateStaticParams` with `app`. Examples * [Static Export](https://github.com/vercel/next.js/tree/canary/examples/with-static-export) `exportPathMap` allows you to specify a mapping of request paths to page destinations, to be used during export. Paths defined in `exportPathMap` will also be available when using [`next dev`](/docs/app/api-reference/next-cli#development). Let's start with an example, to create a custom `exportPathMap` for an app with the following pages: * `pages/index.js` * `pages/about.js` * `pages/post.js` Open `next.config.js` and add the following `exportPathMap` config: next.config.js module.exports = { exportPathMap: async function ( defaultPathMap, { dev, dir, outDir, distDir, buildId } ) { return { '/': { page: '/' }, '/about': { page: '/about' }, '/p/hello-nextjs': { page: '/post', query: { title: 'hello-nextjs' } }, '/p/learn-nextjs': { page: '/post', query: { title: 'learn-nextjs' } }, '/p/deploy-nextjs': { page: '/post', query: { title: 'deploy-nextjs' } }, } }, } > **Good to know**: the `query` field in `exportPathMap` cannot be used with [automatically statically optimized pages](/docs/pages/building-your-application/rendering/automatic-static-optimization) or [`getStaticProps` pages](/docs/pages/building-your-application/data-fetching/get-static-props) as they are rendered to HTML files at build-time and additional query information cannot be provided during `next export`. The pages will then be exported as HTML files, for example, `/about` will become `/about.html`. `exportPathMap` is an `async` function that receives 2 arguments: the first one is `defaultPathMap`, which is the default map used by Next.js. The second argument is an object with: * `dev` - `true` when `exportPathMap` is being called in development. `false` when running `next export`. In development `exportPathMap` is used to define routes. * `dir` - Absolute path to the project directory * `outDir` - Absolute path to the `out/` directory ([configurable with `-o`](#customizing-the-output-directory)). When `dev` is `true` the value of `outDir` will be `null`. * `distDir` - Absolute path to the `.next/` directory (configurable with the [`distDir`](/docs/pages/api-reference/next-config-js/distDir) config) * `buildId` - The generated build id The returned object is a map of pages where the `key` is the `pathname` and the `value` is an object that accepts the following fields: * `page`: `String` - the page inside the `pages` directory to render * `query`: `Object` - the `query` object passed to `getInitialProps` when prerendering. Defaults to `{}` > The exported `pathname` can also be a filename (for example, `/readme.md`), but you may need to set the `Content-Type` header to `text/html` when serving its content if it is different than `.html`. [Adding a trailing slash](#adding-a-trailing-slash) --------------------------------------------------- It is possible to configure Next.js to export pages as `index.html` files and require trailing slashes, `/about` becomes `/about/index.html` and is routable via `/about/`. This was the default behavior prior to Next.js 9. To switch back and add a trailing slash, open `next.config.js` and enable the `trailingSlash` config: next.config.js module.exports = { trailingSlash: true, } [Customizing the output directory](#customizing-the-output-directory) --------------------------------------------------------------------- [`next export`](/docs/pages/building-your-application/deploying/static-exports) will use `out` as the default output directory, you can customize this using the `-o` argument, like so: Terminal next export -o outdir > **Warning**: Using `exportPathMap` is deprecated and is overridden by `getStaticPaths` inside `pages`. We don't recommend using them together. [Previous eslint ](/docs/pages/api-reference/next-config-js/eslint) [Next generateBuildId ](/docs/pages/api-reference/next-config-js/generateBuildId) Was this helpful? supported. Send

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[<Link>](/docs/app/api-reference/components/link) * [<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, 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[useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [ basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Links](#links) * [Images](#images) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/basePath.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)basePath basePath ======== To deploy a Next.js application under a sub-path of a domain you can use the `basePath` config option. `basePath` allows you to set a path prefix for the application. For example, to use `/docs` instead of `''` (an empty string, the default), open `next.config.js` and add the `basePath` config: next.config.js module.exports = { basePath: '/docs', } > **Good to know**: This value must be set at build time and cannot be changed without re-building as the value is inlined in the client-side bundles. ### [Links](#links) When linking to other pages using `next/link` and `next/router` the `basePath` will be automatically applied. For example, using `/about` will automatically become `/docs/about` when `basePath` is set to `/docs`. export default function HomePage() { return ( <> <Link href="/about">About Page</Link> </> ) } Output html: <a href="/docs/about">About Page</a> This makes sure that you don't have to change all links in your application when changing the `basePath` value. ### [Images](#images) When using the [`next/image`](/docs/pages/api-reference/components/image) component, you will need to add the `basePath` in front of `src`. For example, using `/docs/me.png` will properly serve your image when `basePath` is set to `/docs`. import Image from 'next/image' function Home() { return ( <> <h1>My Homepage</h1> <Image src="/docs/me.png" alt="Picture of the author" width={500} height={500} /> <p>Welcome to my homepage!</p> </> ) } export default Home [Previous assetPrefix ](/docs/pages/api-reference/next-config-js/assetPrefix) [Next compress ](/docs/pages/api-reference/next-config-js/compress) Was this helpful? supported. Send

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(CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Route Announcements](#route-announcements) * [Linting](#linting) * [Accessibility Resources](#accessibility-resources) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/04-architecture/accessibility.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Architecture](/docs/architecture)Accessibility Accessibility ============= The Next.js team is committed to making Next.js accessible to all developers (and their end-users). By adding accessibility features to Next.js by default, we aim to make the Web more inclusive for everyone. [Route Announcements](#route-announcements) ------------------------------------------- When transitioning between pages rendered on the server (e.g. using the `<a href>` tag) screen readers and other assistive technology announce the page title when the page loads so that users understand that the page has changed. In addition to traditional page navigations, Next.js also supports client-side transitions for improved performance (using `next/link`). To ensure that client-side transitions are also announced to assistive technology, Next.js includes a route announcer by default. The Next.js route announcer looks for the page name to announce by first inspecting `document.title`, then the `<h1>` element, and finally the URL pathname. For the most accessible user experience, ensure that each page in your application has a unique and descriptive title. [Linting](#linting) ------------------- Next.js provides an [integrated ESLint experience](/docs/pages/building-your-application/configuring/eslint) out of the box, including custom rules for Next.js. By default, Next.js includes `eslint-plugin-jsx-a11y` to help catch accessibility issues early, including warning on: * [aria-props](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/HEAD/docs/rules/aria-props.md?rgh-link-date=2021-06-04T02%3A10%3A36Z) * [aria-proptypes](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/HEAD/docs/rules/aria-proptypes.md?rgh-link-date=2021-06-04T02%3A10%3A36Z) * [aria-unsupported-elements](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/HEAD/docs/rules/aria-unsupported-elements.md?rgh-link-date=2021-06-04T02%3A10%3A36Z) * [role-has-required-aria-props](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/HEAD/docs/rules/role-has-required-aria-props.md?rgh-link-date=2021-06-04T02%3A10%3A36Z) * [role-supports-aria-props](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/HEAD/docs/rules/role-supports-aria-props.md?rgh-link-date=2021-06-04T02%3A10%3A36Z) For example, this plugin helps ensure you add alt text to `img` tags, use correct `aria-*` attributes, use correct `role` attributes, and more. [Accessibility Resources](#accessibility-resources) --------------------------------------------------- * [WebAIM WCAG checklist](https://webaim.org/standards/wcag/checklist) * [WCAG 2.2 Guidelines](https://www.w3.org/TR/WCAG22/) * [The A11y Project](https://www.a11yproject.com/) * Check [color contrast ratios](https://developer.mozilla.org/docs/Web/Accessibility/Understanding_WCAG/Perceivable/Color_contrast) between foreground and background elements * Use [`prefers-reduced-motion`](https://web.dev/prefers-reduced-motion/) when working with animations [Previous Architecture ](/docs/architecture) [Next Fast Refresh ](/docs/architecture/fast-refresh) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [How It Works](#how-it-works) * [Error Resilience](#error-resilience) * [Syntax Errors](#syntax-errors) * [Runtime Errors](#runtime-errors) * [Limitations](#limitations) * [Tips](#tips) * [Fast Refresh and Hooks](#fast-refresh-and-hooks) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/04-architecture/fast-refresh.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Architecture](/docs/architecture)Fast Refresh Fast Refresh ============ Fast Refresh is a Next.js feature that gives you instantaneous feedback on edits made to your React components. Fast Refresh is enabled by default in all Next.js applications on **9.4 or newer**. With Next.js Fast Refresh enabled, most edits should be visible within a second, **without losing component state**. [How It Works](#how-it-works) ----------------------------- * If you edit a file that **only exports React component(s)**, Fast Refresh will update the code only for that file, and re-render your component. You can edit anything in that file, including styles, rendering logic, event handlers, or effects. * If you edit a file with exports that _aren't_ React components, Fast Refresh will re-run both that file, and the other files importing it. So if both `Button.js` and `Modal.js` import `theme.js`, editing `theme.js` will update both components. * Finally, if you **edit a file** that's **imported by files outside of the React tree**, Fast Refresh **will fall back to doing a full reload**. You might have a file which renders a React component but also exports a value that is imported by a **non-React component**. For example, maybe your component also exports a constant, and a non-React utility file imports it. In that case, consider migrating the constant to a separate file and importing it into both files. This will re-enable Fast Refresh to work. Other cases can usually be solved in a similar way. [Error Resilience](#error-resilience) ------------------------------------- ### [Syntax Errors](#syntax-errors) If you make a syntax error during development, you can fix it and save the file again. The error will disappear automatically, so you won't need to reload the app. **You will not lose component state**. ### [Runtime Errors](#runtime-errors) If you make a mistake that leads to a runtime error inside your component, you'll be greeted with a contextual overlay. Fixing the error will automatically dismiss the overlay, without reloading the app. Component state will be retained if the error did not occur during rendering. If the error did occur during rendering, React will remount your application using the updated code. If you have [error boundaries](https://react.dev/reference/react/Component#catching-rendering-errors-with-an-error-boundary) in your app (which is a good idea for graceful failures in production), they will retry rendering on the next edit after a rendering error. This means having an error boundary can prevent you from always getting reset to the root app state. However, keep in mind that error boundaries shouldn't be _too_ granular. They are used by React in production, and should always be designed intentionally. [Limitations](#limitations) --------------------------- Fast Refresh tries to preserve local React state in the component you're editing, but only if it's safe to do so. Here's a few reasons why you might see local state being reset on every edit to a file: * Local state is not preserved for class components (only function components and Hooks preserve state). * The file you're editing might have _other_ exports in addition to a React component. * Sometimes, a file would export the result of calling a higher-order component like `HOC(WrappedComponent)`. If the returned component is a class, its state will be reset. * Anonymous arrow functions like `export default () => <div />;` cause Fast Refresh to not preserve local component state. For large codebases you can use our [`name-default-component` codemod](/docs/pages/building-your-application/upgrading/codemods#name-default-component). As more of your codebase moves to function components and Hooks, you can expect state to be preserved in more cases. [Tips](#tips) ------------- * Fast Refresh preserves React local state in function components (and Hooks) by default. * Sometimes you might want to _force_ the state to be reset, and a component to be remounted. For example, this can be handy if you're tweaking an animation that only happens on mount. To do this, you can add `// @refresh reset` anywhere in the file you're editing. This directive is local to the file, and instructs Fast Refresh to remount components defined in that file on every edit. * You can put `console.log` or `debugger;` into the components you edit during development. * Remember that imports are case sensitive. Both fast and full refresh can fail, when your import doesn't match the actual filename. For example, `'./header'` vs `'./Header'`. [Fast Refresh and Hooks](#fast-refresh-and-hooks) ------------------------------------------------- When possible, Fast Refresh attempts to preserve the state of your component between edits. In particular, `useState` and `useRef` preserve their previous values as long as you don't change their arguments or the order of the Hook calls. Hooks with dependencies—such as `useEffect`, `useMemo`, and `useCallback`—will _always_ update during Fast Refresh. Their list of dependencies will be ignored while Fast Refresh is happening. For example, when you edit `useMemo(() => x * 2, [x])` to `useMemo(() => x * 10, [x])`, it will re-run even though `x` (the dependency) has not changed. If React didn't do that, your edit wouldn't reflect on the screen! Sometimes, this can lead to unexpected results. For example, even a `useEffect` with an empty array of dependencies would still re-run once during Fast Refresh. However, writing code resilient to occasional re-running of `useEffect` is a good practice even without Fast Refresh. It will make it easier for you to introduce new dependencies to it later on and it's enforced by [React Strict Mode](/docs/pages/api-reference/next-config-js/reactStrictMode), which we highly recommend enabling. [Previous Accessibility ](/docs/architecture/accessibility) [Next Next.js Compiler ](/docs/architecture/nextjs-compiler) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Header Overriding Behavior](#header-overriding-behavior) * [Path Matching](#path-matching) * [Wildcard Path Matching](#wildcard-path-matching) * [Regex Path Matching](#regex-path-matching) * [Header, Cookie, and Query Matching](#header-cookie-and-query-matching) * [Headers with basePath support](#headers-with-basepath-support) * [Headers with i18n support](#headers-with-i18n-support) * [Cache-Control](#cache-control) * [Options](#options) * [CORS](#cors) * [X-DNS-Prefetch-Control](#x-dns-prefetch-control) * [Strict-Transport-Security](#strict-transport-security) * [X-Frame-Options](#x-frame-options) * [Permissions-Policy](#permissions-policy) * [X-Content-Type-Options](#x-content-type-options) * [Referrer-Policy](#referrer-policy) * [Content-Security-Policy](#content-security-policy) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/headers.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)headers headers ======= Headers allow you to set custom HTTP headers on the response to an incoming request on a given path. To set custom HTTP headers you can use the `headers` key in `next.config.js`: next.config.js module.exports = { async headers() { return [ { source: '/about', headers: [ { key: 'x-custom-header', value: 'my custom header value', }, { key: 'x-another-custom-header', value: 'my other custom header value', }, ], }, ] }, } `headers` is an async function that expects an array to be returned holding objects with `source` and `headers` properties: * `source` is the incoming request path pattern. * `headers` is an array of response header objects, with `key` and `value` properties. * `basePath`: `false` or `undefined` - if false the basePath won't be included when matching, can be used for external rewrites only. * `locale`: `false` or `undefined` - whether the locale should not be included when matching. * `has` is an array of [has objects](#header-cookie-and-query-matching) with the `type`, `key` and `value` properties. * `missing` is an array of [missing objects](#header-cookie-and-query-matching) with the `type`, `key` and `value` properties. Headers are checked before the filesystem which includes pages and `/public` files. [Header Overriding Behavior](#header-overriding-behavior) --------------------------------------------------------- If two headers match the same path and set the same header key, the last header key will override the first. Using the below headers, the path `/hello` will result in the header `x-hello` being `world` due to the last header value set being `world`. next.config.js module.exports = { async headers() { return [ { source: '/:path*', headers: [ { key: 'x-hello', value: 'there', }, ], }, { source: '/hello', headers: [ { key: 'x-hello', value: 'world', }, ], }, ] }, } [Path Matching](#path-matching) ------------------------------- Path matches are allowed, for example `/blog/:slug` will match `/blog/hello-world` (no nested paths): next.config.js module.exports = { async headers() { return [ { source: '/blog/:slug', headers: [ { key: 'x-slug', value: ':slug', // Matched parameters can be used in the value }, { key: 'x-slug-:slug', // Matched parameters can be used in the key value: 'my other custom header value', }, ], }, ] }, } ### [Wildcard Path Matching](#wildcard-path-matching) To match a wildcard path you can use `*` after a parameter, for example `/blog/:slug*` will match `/blog/a/b/c/d/hello-world`: next.config.js module.exports = { async headers() { return [ { source: '/blog/:slug*', headers: [ { key: 'x-slug', value: ':slug*', // Matched parameters can be used in the value }, { key: 'x-slug-:slug*', // Matched parameters can be used in the key value: 'my other custom header value', }, ], }, ] }, } ### [Regex Path Matching](#regex-path-matching) To match a regex path you can wrap the regex in parenthesis after a parameter, for example `/blog/:slug(\\d{1,})` will match `/blog/123` but not `/blog/abc`: next.config.js module.exports = { async headers() { return [ { source: '/blog/:post(\\d{1,})', headers: [ { key: 'x-post', value: ':post', }, ], }, ] }, } The following characters `(`, `)`, `{`, `}`, `:`, `*`, `+`, `?` are used for regex path matching, so when used in the `source` as non-special values they must be escaped by adding `\\` before them: next.config.js module.exports = { async headers() { return [ { // this will match `/english(default)/something` being requested source: '/english\\(default\\)/:slug', headers: [ { key: 'x-header', value: 'value', }, ], }, ] }, } [Header, Cookie, and Query Matching](#header-cookie-and-query-matching) ----------------------------------------------------------------------- To only apply a header when header, cookie, or query values also match the `has` field or don't match the `missing` field can be used. Both the `source` and all `has` items must match and all `missing` items must not match for the header to be applied. `has` and `missing` items can have the following fields: * `type`: `String` - must be either `header`, `cookie`, `host`, or `query`. * `key`: `String` - the key from the selected type to match against. * `value`: `String` or `undefined` - the value to check for, if undefined any value will match. A regex like string can be used to capture a specific part of the value, e.g. if the value `first-(?<paramName>.*)` is used for `first-second` then `second` will be usable in the destination with `:paramName`. next.config.js module.exports = { async headers() { return [ // if the header `x-add-header` is present, // the `x-another-header` header will be applied { source: '/:path*', has: [ { type: 'header', key: 'x-add-header', }, ], headers: [ { key: 'x-another-header', value: 'hello', }, ], }, // if the header `x-no-header` is not present, // the `x-another-header` header will be applied { source: '/:path*', missing: [ { type: 'header', key: 'x-no-header', }, ], headers: [ { key: 'x-another-header', value: 'hello', }, ], }, // if the source, query, and cookie are matched, // the `x-authorized` header will be applied { source: '/specific/:path*', has: [ { type: 'query', key: 'page', // the page value will not be available in the // header key/values since value is provided and // doesn't use a named capture group e.g. (?<page>home) value: 'home', }, { type: 'cookie', key: 'authorized', value: 'true', }, ], headers: [ { key: 'x-authorized', value: ':authorized', }, ], }, // if the header `x-authorized` is present and // contains a matching value, the `x-another-header` will be applied { source: '/:path*', has: [ { type: 'header', key: 'x-authorized', value: '(?<authorized>yes|true)', }, ], headers: [ { key: 'x-another-header', value: ':authorized', }, ], }, // if the host is `example.com`, // this header will be applied { source: '/:path*', has: [ { type: 'host', value: 'example.com', }, ], headers: [ { key: 'x-another-header', value: ':authorized', }, ], }, ] }, } [Headers with basePath support](#headers-with-basepath-support) --------------------------------------------------------------- When leveraging [`basePath` support](/docs/app/api-reference/next-config-js/basePath) with headers each `source` is automatically prefixed with the `basePath` unless you add `basePath: false` to the header: next.config.js module.exports = { basePath: '/docs', async headers() { return [ { source: '/with-basePath', // becomes /docs/with-basePath headers: [ { key: 'x-hello', value: 'world', }, ], }, { source: '/without-basePath', // is not modified since basePath: false is set headers: [ { key: 'x-hello', value: 'world', }, ], basePath: false, }, ] }, } [Headers with i18n support](#headers-with-i18n-support) ------------------------------------------------------- When leveraging [`i18n` support](/docs/pages/building-your-application/routing/internationalization) with headers each `source` is automatically prefixed to handle the configured `locales` unless you add `locale: false` to the header. If `locale: false` is used you must prefix the `source` with a locale for it to be matched correctly. next.config.js module.exports = { i18n: { locales: ['en', 'fr', 'de'], defaultLocale: 'en', }, async headers() { return [ { source: '/with-locale', // automatically handles all locales headers: [ { key: 'x-hello', value: 'world', }, ], }, { // does not handle locales automatically since locale: false is set source: '/nl/with-locale-manual', locale: false, headers: [ { key: 'x-hello', value: 'world', }, ], }, { // this matches '/' since `en` is the defaultLocale source: '/en', locale: false, headers: [ { key: 'x-hello', value: 'world', }, ], }, { // this gets converted to /(en|fr|de)/(.*) so will not match the top-level // `/` or `/fr` routes like /:path* would source: '/(.*)', headers: [ { key: 'x-hello', value: 'world', }, ], }, ] }, } [Cache-Control](#cache-control) ------------------------------- You cannot set `Cache-Control` headers in `next.config.js` for pages or assets, as these headers will be overwritten in production to ensure that responses and static assets are cached effectively. If you need to revalidate the cache of a page that has been [statically generated](/docs/pages/building-your-application/rendering/static-site-generation), you can do so by setting the `revalidate` prop in the page's [`getStaticProps`](/docs/pages/building-your-application/data-fetching/get-static-props) function. You can set the `Cache-Control` header in your [API Routes](/docs/pages/building-your-application/routing/api-routes) by using the `res.setHeader` method: pages/api/hello.ts TypeScript JavaScriptTypeScript import type { NextApiRequest, NextApiResponse } from 'next' type ResponseData = { message: string } export default function handler( req: NextApiRequest, res: NextApiResponse<ResponseData> ) { res.setHeader('Cache-Control', 's-maxage=86400') res.status(200).json({ message: 'Hello from Next.js!' }) } [Options](#options) ------------------- ### [CORS](#cors) [Cross-Origin Resource Sharing (CORS)](https://developer.mozilla.org/docs/Web/HTTP/CORS) is a security feature that allows you to control which sites can access your resources. You can set the `Access-Control-Allow-Origin` header to allow a specific origin to access your API Endpoints. async headers() { return [ { source: "/api/:path*", headers: [ { key: "Access-Control-Allow-Origin", value: "*", // Set your origin }, { key: "Access-Control-Allow-Methods", value: "GET, POST, PUT, DELETE, OPTIONS", }, { key: "Access-Control-Allow-Headers", value: "Content-Type, Authorization", }, ], }, ]; }, ### [X-DNS-Prefetch-Control](#x-dns-prefetch-control) [This header](https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control) controls DNS prefetching, allowing browsers to proactively perform domain name resolution on external links, images, CSS, JavaScript, and more. This prefetching is performed in the background, so the [DNS](https://developer.mozilla.org/docs/Glossary/DNS) is more likely to be resolved by the time the referenced items are needed. This reduces latency when the user clicks a link. { key: 'X-DNS-Prefetch-Control', value: 'on' } ### [Strict-Transport-Security](#strict-transport-security) [This header](https://developer.mozilla.org/docs/Web/HTTP/Headers/Strict-Transport-Security) informs browsers it should only be accessed using HTTPS, instead of using HTTP. Using the configuration below, all present and future subdomains will use HTTPS for a `max-age` of 2 years. This blocks access to pages or subdomains that can only be served over HTTP. If you're deploying to [Vercel](https://vercel.com/docs/concepts/edge-network/headers#strict-transport-security?utm_source=next-site&utm_medium=docs&utm_campaign=next-website), this header is not necessary as it's automatically added to all deployments unless you declare `headers` in your `next.config.js`. { key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubDomains; preload' } ### [X-Frame-Options](#x-frame-options) [This header](https://developer.mozilla.org/docs/Web/HTTP/Headers/X-Frame-Options) indicates whether the site should be allowed to be displayed within an `iframe`. This can prevent against clickjacking attacks. **This header has been superseded by CSP's `frame-ancestors` option**, which has better support in modern browsers (see [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) for configuration details). { key: 'X-Frame-Options', value: 'SAMEORIGIN' } ### [Permissions-Policy](#permissions-policy) [This header](https://developer.mozilla.org/docs/Web/HTTP/Headers/Permissions-Policy) allows you to control which features and APIs can be used in the browser. It was previously named `Feature-Policy`. { key: 'Permissions-Policy', value: 'camera=(), microphone=(), geolocation=(), browsing-topics=()' } ### [X-Content-Type-Options](#x-content-type-options) [This header](https://developer.mozilla.org/docs/Web/HTTP/Headers/X-Content-Type-Options) prevents the browser from attempting to guess the type of content if the `Content-Type` header is not explicitly set. This can prevent XSS exploits for websites that allow users to upload and share files. For example, a user trying to download an image, but having it treated as a different `Content-Type` like an executable, which could be malicious. This header also applies to downloading browser extensions. The only valid value for this header is `nosniff`. { key: 'X-Content-Type-Options', value: 'nosniff' } ### [Referrer-Policy](#referrer-policy) [This header](https://developer.mozilla.org/docs/Web/HTTP/Headers/Referrer-Policy) controls how much information the browser includes when navigating from the current website (origin) to another. { key: 'Referrer-Policy', value: 'origin-when-cross-origin' } ### [Content-Security-Policy](#content-security-policy) Learn more about adding a [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) to your application. [Version History](#version-history) ----------------------------------- Version Changes `v13.3.0` `missing` added. `v10.2.0` `has` added. `v9.5.0` Headers added. [Previous generateEtags ](/docs/pages/api-reference/next-config-js/generateEtags) [Next httpAgentOptions ](/docs/pages/api-reference/next-config-js/httpAgentOptions) Was this helpful? supported. Send

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apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * 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[pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party 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Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Why SWC?](#why-swc) * [Supported Features](#supported-features) * [Styled Components](#styled-components) * [Jest](#jest) * [Relay](#relay) * [Remove React Properties](#remove-react-properties) * [Remove Console](#remove-console) * [Legacy Decorators](#legacy-decorators) * [importSource](#importsource) * [Emotion](#emotion) * [Minification](#minification) * [Module Transpilation](#module-transpilation) * [Modularize Imports](#modularize-imports) * [Experimental Features](#experimental-features) * [SWC Trace profiling](#swc-trace-profiling) * [SWC Plugins (Experimental)](#swc-plugins-experimental) * [Unsupported Features](#unsupported-features) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/04-architecture/nextjs-compiler.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Architecture](/docs/architecture)Next.js Compiler Next.js Compiler ================ The Next.js Compiler, written in Rust using [SWC](https://swc.rs/), allows Next.js to transform and minify your JavaScript code for production. This replaces Babel for individual files and Terser for minifying output bundles. Compilation using the Next.js Compiler is 17x faster than Babel and enabled by default since Next.js version 12. If you have an existing Babel configuration or are using [unsupported features](#unsupported-features), your application will opt-out of the Next.js Compiler and continue using Babel. [Why SWC?](#why-swc) -------------------- [SWC](https://swc.rs/) is an extensible Rust-based platform for the next generation of fast developer tools. SWC can be used for compilation, minification, bundling, and more – and is designed to be extended. It's something you can call to perform code transformations (either built-in or custom). Running those transformations happens through higher-level tools like Next.js. We chose to build on SWC for a few reasons: * **Extensibility:** SWC can be used as a Crate inside Next.js, without having to fork the library or workaround design constraints. * **Performance:** We were able to achieve ~3x faster Fast Refresh and ~5x faster builds in Next.js by switching to SWC, with more room for optimization still in progress. * **WebAssembly:** Rust's support for WASM is essential for supporting all possible platforms and taking Next.js development everywhere. * **Community:** The Rust community and ecosystem are amazing and still growing. [Supported Features](#supported-features) ----------------------------------------- ### [Styled Components](#styled-components) We're working to port `babel-plugin-styled-components` to the Next.js Compiler. First, update to the latest version of Next.js: `npm install next@latest`. Then, update your `next.config.js` file: next.config.js module.exports = { compiler: { styledComponents: true, }, } For advanced use cases, you can configure individual properties for styled-components compilation. > Note: `minify`, `transpileTemplateLiterals` and `pure` are not yet implemented. You can follow the progress [here](https://github.com/vercel/next.js/issues/30802). `ssr` and `displayName` transforms are the main requirement for using `styled-components` in Next.js. next.config.js module.exports = { compiler: { // see https://styled-components.com/docs/tooling#babel-plugin for more info on the options. styledComponents: { // Enabled by default in development, disabled in production to reduce file size, // setting this will override the default for all environments. displayName?: boolean, // Enabled by default. ssr?: boolean, // Enabled by default. fileName?: boolean, // Empty by default. topLevelImportPaths?: string[], // Defaults to ["index"]. meaninglessFileNames?: string[], // Enabled by default. cssProp?: boolean, // Empty by default. namespace?: string, // Not supported yet. minify?: boolean, // Not supported yet. transpileTemplateLiterals?: boolean, // Not supported yet. pure?: boolean, }, }, } ### [Jest](#jest) The Next.js Compiler transpiles your tests and simplifies configuring Jest together with Next.js including: * Auto mocking of `.css`, `.module.css` (and their `.scss` variants), and image imports * Automatically sets up `transform` using SWC * Loading `.env` (and all variants) into `process.env` * Ignores `node_modules` from test resolving and transforms * Ignoring `.next` from test resolving * Loads `next.config.js` for flags that enable experimental SWC transforms First, update to the latest version of Next.js: `npm install next@latest`. Then, update your `jest.config.js` file: jest.config.js const nextJest = require('next/jest') // Providing the path to your Next.js app which will enable loading next.config.js and .env files const createJestConfig = nextJest({ dir: './' }) // Any custom config you want to pass to Jest const customJestConfig = { setupFilesAfterEnv: ['<rootDir>/jest.setup.js'], } // createJestConfig is exported in this way to ensure that next/jest can load the Next.js configuration, which is async module.exports = createJestConfig(customJestConfig) ### [Relay](#relay) To enable [Relay](https://relay.dev/) support: next.config.js module.exports = { compiler: { relay: { // This should match relay.config.js src: './', artifactDirectory: './__generated__', language: 'typescript', eagerEsModules: false, }, }, } > **Good to know**: In Next.js, all JavaScript files in `pages` directory are considered routes. So, for `relay-compiler` you'll need to specify `artifactDirectory` configuration settings outside of the `pages`, otherwise `relay-compiler` will generate files next to the source file in the `__generated__` directory, and this file will be considered a route, which will break production builds. ### [Remove React Properties](#remove-react-properties) Allows to remove JSX properties. This is often used for testing. Similar to `babel-plugin-react-remove-properties`. To remove properties matching the default regex `^data-test`: next.config.js module.exports = { compiler: { reactRemoveProperties: true, }, } To remove custom properties: next.config.js module.exports = { compiler: { // The regexes defined here are processed in Rust so the syntax is different from // JavaScript `RegExp`s. See https://docs.rs/regex. reactRemoveProperties: { properties: ['^data-custom$'] }, }, } ### [Remove Console](#remove-console) This transform allows for removing all `console.*` calls in application code (not `node_modules`). Similar to `babel-plugin-transform-remove-console`. Remove all `console.*` calls: next.config.js module.exports = { compiler: { removeConsole: true, }, } Remove `console.*` output except `console.error`: next.config.js module.exports = { compiler: { removeConsole: { exclude: ['error'], }, }, } ### [Legacy Decorators](#legacy-decorators) Next.js will automatically detect `experimentalDecorators` in `jsconfig.json` or `tsconfig.json`. Legacy decorators are commonly used with older versions of libraries like `mobx`. This flag is only supported for compatibility with existing applications. We do not recommend using legacy decorators in new applications. First, update to the latest version of Next.js: `npm install next@latest`. Then, update your `jsconfig.json` or `tsconfig.json` file: { "compilerOptions": { "experimentalDecorators": true } } ### [importSource](#importsource) Next.js will automatically detect `jsxImportSource` in `jsconfig.json` or `tsconfig.json` and apply that. This is commonly used with libraries like [Theme UI](https://theme-ui.com). First, update to the latest version of Next.js: `npm install next@latest`. Then, update your `jsconfig.json` or `tsconfig.json` file: { "compilerOptions": { "jsxImportSource": "theme-ui" } } ### [Emotion](#emotion) We're working to port `@emotion/babel-plugin` to the Next.js Compiler. First, update to the latest version of Next.js: `npm install next@latest`. Then, update your `next.config.js` file: next.config.js module.exports = { compiler: { emotion: boolean | { // default is true. It will be disabled when build type is production. sourceMap?: boolean, // default is 'dev-only'. autoLabel?: 'never' | 'dev-only' | 'always', // default is '[local]'. // Allowed values: `[local]` `[filename]` and `[dirname]` // This option only works when autoLabel is set to 'dev-only' or 'always'. // It allows you to define the format of the resulting label. // The format is defined via string where variable parts are enclosed in square brackets []. // For example labelFormat: "my-classname--[local]", where [local] will be replaced with the name of the variable the result is assigned to. labelFormat?: string, // default is undefined. // This option allows you to tell the compiler what imports it should // look at to determine what it should transform so if you re-export // Emotion's exports, you can still use transforms. importMap?: { [packageName: string]: { [exportName: string]: { canonicalImport?: [string, string], styledBaseImport?: [string, string], } } }, }, }, } ### [Minification](#minification) Next.js' swc compiler is used for minification by default since v13. This is 7x faster than Terser. If Terser is still needed for any reason this can be configured. next.config.js module.exports = { swcMinify: false, } ### [Module Transpilation](#module-transpilation) Next.js can automatically transpile and bundle dependencies from local packages (like monorepos) or from external dependencies (`node_modules`). This replaces the `next-transpile-modules` package. next.config.js module.exports = { transpilePackages: ['@acme/ui', 'lodash-es'], } ### [Modularize Imports](#modularize-imports) This option has been superseded by [`optimizePackageImports`](/docs/app/api-reference/next-config-js/optimizePackageImports) in Next.js 13.5. We recommend upgrading to use the new option that does not require manual configuration of import paths. [Experimental Features](#experimental-features) ----------------------------------------------- ### [SWC Trace profiling](#swc-trace-profiling) You can generate SWC's internal transform traces as chromium's [trace event format](https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview?mode=html#%21=). next.config.js module.exports = { experimental: { swcTraceProfiling: true, }, } Once enabled, swc will generate trace named as `swc-trace-profile-${timestamp}.json` under `.next/`. Chromium's trace viewer (chrome://tracing/, [https://ui.perfetto.dev/](https://ui.perfetto.dev/)), or compatible flamegraph viewer ([https://www.speedscope.app/](https://www.speedscope.app/)) can load & visualize generated traces. ### [SWC Plugins (Experimental)](#swc-plugins-experimental) You can configure swc's transform to use SWC's experimental plugin support written in wasm to customize transformation behavior. next.config.js module.exports = { experimental: { swcPlugins: [ [ 'plugin', { ...pluginOptions, }, ], ], }, } `swcPlugins` accepts an array of tuples for configuring plugins. A tuple for the plugin contains the path to the plugin and an object for plugin configuration. The path to the plugin can be an npm module package name or an absolute path to the `.wasm` binary itself. [Unsupported Features](#unsupported-features) --------------------------------------------- When your application has a `.babelrc` file, Next.js will automatically fall back to using Babel for transforming individual files. This ensures backwards compatibility with existing applications that leverage custom Babel plugins. If you're using a custom Babel setup, [please share your configuration](https://github.com/vercel/next.js/discussions/30174). We're working to port as many commonly used Babel transformations as possible, as well as supporting plugins in the future. [Version History](#version-history) ----------------------------------- Version Changes `v13.1.0` [Module Transpilation](https://nextjs.org/blog/next-13-1#built-in-module-transpilation-stable) and [Modularize Imports](https://nextjs.org/blog/next-13-1#import-resolution-for-smaller-bundles) stable. `v13.0.0` SWC Minifier enabled by default. `v12.3.0` SWC Minifier [stable](https://nextjs.org/blog/next-12-3#swc-minifier-stable). `v12.2.0` [SWC Plugins](#swc-plugins-experimental) experimental support added. `v12.1.0` Added support for Styled Components, Jest, Relay, Remove React Properties, Legacy Decorators, Remove Console, and jsxImportSource. `v12.0.0` Next.js Compiler [introduced](https://nextjs.org/blog/next-12). [Previous Fast Refresh ](/docs/architecture/fast-refresh) [Next Supported Browsers ](/docs/architecture/supported-browsers) Was this helpful? supported. Send

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into Next.js. [Usage](#usage) --------------- Turbopack can be used in Next.js in both the `pages` and `app` directories for faster local development. To enable Turbopack, use the `--turbo` flag when running the Next.js development server. package.json { "scripts": { "dev": "next dev --turbo", "build": "next build", "start": "next start", "lint": "next lint" } } [Supported features](#supported-features) ----------------------------------------- Turbopack in Next.js requires zero-configuration for most users and can be extended for more advanced use cases. To learn more about the currently supported features for Turbopack, view the [API Reference](/docs/app/api-reference/next-config-js/turbo). [Unsupported features](#unsupported-features) --------------------------------------------- Turbopack currently only supports `next dev` and does not support `next build`. We are currently working on support for builds as we move closer towards stability. These features are currently not supported: * [`webpack()`](/docs/app/api-reference/next-config-js/webpack) configuration in `next.config.js` * Turbopack replaces Webpack, this means that webpack configuration is not supported. * To configure Turbopack, [see the documentation](/docs/app/api-reference/next-config-js/turbo). * A subset of [Webpack loaders](/docs/app/api-reference/next-config-js/turbo#webpack-loaders) are supported in Turbopack. * Babel (`.babelrc`) * Turbopack leverages the [SWC](/docs/architecture/nextjs-compiler#why-swc) compiler for all transpilation and optimizations. This means that Babel is not included by default. * If you have a `.babelrc` file, you might no longer need it because Next.js includes common Babel plugins as SWC transforms that can be enabled. You can read more about this in the [compiler documentation](docs/architecture/nextjs-compiler#supported-features). * If you still need to use Babel after verifying your particular use case is not covered, you can leverage Turbopack's [support for custom webpack loaders](/docs/app/api-reference/next-config-js/turbo#webpack-loaders) to include `babel-loader`. * Creating a root layout automatically in App Router. * This behavior is currently not supported since it changes input files, instead, an error will be shown for you manually add a root layout in the desired location. * `@next/font` (legacy font support). * `@next/font` is deprecated in favor of `next/font`. [`next/font`](/docs/app/building-your-application/optimizing/fonts) is fully supported with Turbopack. * `new Worker('file', import.meta.url)`. * We are planning to implement this in the future. * [Relay transforms](/docs/architecture/nextjs-compiler#relay) * We are planning to implement this in the future. * `experimental.nextScriptWorkers` * We are planning to implement this in the future. * [AMP](/docs/pages/building-your-application/configuring/amp). * We are currently not planning to support AMP in Next.js with Turbopack. * Yarn PnP * We are currently not planning to support Yarn PnP in Next.js with Turbopack. * [`experimental.urlImports`](/docs/app/api-reference/next-config-js/urlImports) * We are currently not planning to support `experimental.urlImports` in Next.js with Turbopack. [Generating Trace Files](#generating-trace-files) ------------------------------------------------- Trace files allow the Next.js team to investigate and improve performance metrics and memory usage. To generate a trace file, append `NEXT_TURBOPACK_TRACING=1` to the `next dev --turbo` command, this will generate a `.next/trace.log` file. When reporting issues related to Turbopack performance and memory usage, please include the trace file in your [GitHub](https://github.com/vercel/next.js) issue. [Previous Supported Browsers ](/docs/architecture/supported-browsers) [Next Community ](/docs/community) Was this helpful? supported. Send

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(Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)images images ====== If you want to use a cloud provider to optimize images instead of using the Next.js built-in Image Optimization API, you can configure `next.config.js` with the following: next.config.js module.exports = { images: { loader: 'custom', loaderFile: './my/image/loader.js', }, } This `loaderFile` must point to a file relative to the root of your Next.js application. The file must export a default function that returns a string, for example: my/image/loader.js export default function myImageLoader({ src, width, quality }) { return `https://example.com/${src}?w=${width}&q=${quality || 75}` } Alternatively, you can use the [`loader` prop](/docs/pages/api-reference/components/image#loader) to pass the function to each instance of `next/image`. To learn more about configuring the behavior of the built-in [Image Optimization API](/docs/pages/building-your-application/optimizing/images) and the [Image Component](/docs/pages/api-reference/components/image), see [Image Configuration Options](/docs/pages/api-reference/components/image#configuration-options) for available options. [Example Loader Configuration](#example-loader-configuration) ------------------------------------------------------------- * [Akamai](#akamai) * [AWS CloudFront](#aws-cloudfront) * [Cloudinary](#cloudinary) * [Cloudflare](#cloudflare) * [Contentful](#contentful) * [Fastly](#fastly) * [Gumlet](#gumlet) * [ImageEngine](#imageengine) * [Imgix](#imgix) * [Thumbor](#thumbor) * [Sanity](#sanity) * [Sirv](#sirv) * [Supabase](#supabase) ### [Akamai](#akamai) // Docs: https://techdocs.akamai.com/ivm/reference/test-images-on-demand export default function akamaiLoader({ src, width, quality }) { return `https://example.com/${src}?imwidth=${width}` } ### [AWS CloudFront](#aws-cloudfront) // Docs: https://aws.amazon.com/developer/application-security-performance/articles/image-optimization export default function cloudfrontLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) url.searchParams.set('format', 'auto') url.searchParams.set('width', width.toString()) url.searchParams.set('quality', (quality || 75).toString()) return url.href ### [Cloudinary](#cloudinary) // Demo: https://res.cloudinary.com/demo/image/upload/w_300,c_limit,q_auto/turtles.jpg export default function cloudinaryLoader({ src, width, quality }) { const params = ['f_auto', 'c_limit', `w_${width}`, `q_${quality || 'auto'}`] return `https://example.com/${params.join(',')}${src}` } ### [Cloudflare](#cloudflare) // Docs: https://developers.cloudflare.com/images/url-format export default function cloudflareLoader({ src, width, quality }) { const params = [`width=${width}`, `quality=${quality || 75}`, 'format=auto'] return `https://example.com/cdn-cgi/image/${params.join(',')}/${src}` } ### [Contentful](#contentful) // Docs: https://www.contentful.com/developers/docs/references/images-api/ export default function contentfulLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) url.searchParams.set('fm', 'webp') url.searchParams.set('w', width.toString()) url.searchParams.set('q', (quality || 75).toString()) return url.href } ### [Fastly](#fastly) // Docs: https://developer.fastly.com/reference/io/ export default function fastlyLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) url.searchParams.set('auto', 'webp') url.searchParams.set('width', width.toString()) url.searchParams.set('quality', (quality || 75).toString()) return url.href } ### [Gumlet](#gumlet) // Docs: https://docs.gumlet.com/reference/image-transform-size export default function gumletLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) url.searchParams.set('format', 'auto') url.searchParams.set('w', width.toString()) url.searchParams.set('q', (quality || 75).toString()) return url.href } ### [ImageEngine](#imageengine) // Docs: https://support.imageengine.io/hc/en-us/articles/360058880672-Directives export default function imageengineLoader({ src, width, quality }) { const compression = 100 - (quality || 50) const params = [`w_${width}`, `cmpr_${compression}`)] return `https://example.com${src}?imgeng=/${params.join('/')` } ### [Imgix](#imgix) // Demo: https://static.imgix.net/daisy.png?format=auto&fit=max&w=300 export default function imgixLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) const params = url.searchParams params.set('auto', params.getAll('auto').join(',') || 'format') params.set('fit', params.get('fit') || 'max') params.set('w', params.get('w') || width.toString()) params.set('q', (quality || 50).toString()) return url.href } ### [Thumbor](#thumbor) // Docs: https://thumbor.readthedocs.io/en/latest/ export default function thumborLoader({ src, width, quality }) { const params = [`${width}x0`, `filters:quality(${quality || 75})`] return `https://example.com${params.join('/')}${src}` } ### [Sanity](#sanity) // Docs: https://www.sanity.io/docs/image-urls export default function sanityLoader({ src, width, quality }) { const prj = 'zp7mbokg' const dataset = 'production' const url = new URL(`https://cdn.sanity.io/images/${prj}/${dataset}${src}`) url.searchParams.set('auto', 'format') url.searchParams.set('fit', 'max') url.searchParams.set('w', width.toString()) if (quality) { url.searchParams.set('q', quality.toString()) } return url.href } ### [Sirv](#sirv) // Docs: https://sirv.com/help/articles/dynamic-imaging/ export default function sirvLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) const params = url.searchParams params.set('format', params.getAll('format').join(',') || 'optimal') params.set('w', params.get('w') || width.toString()) params.set('q', (quality || 85).toString()) return url.href } ### [Supabase](#supabase) // Docs: https://supabase.com/docs/guides/storage/image-transformations#nextjs-loader export default function supabaseLoader({ src, width, quality }) { const url = new URL(`https://example.com${src}`) url.searchParams.set('width', width.toString()) url.searchParams.set('quality', (quality || 75).toString()) return url.href } [Previous httpAgentOptions ](/docs/pages/api-reference/next-config-js/httpAgentOptions) [Next instrumentationHook ](/docs/pages/api-reference/next-config-js/instrumentationHook) Was this helpful? supported. 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Browserslist](#browserslist) * [Polyfills](#polyfills) * [Custom Polyfills](#custom-polyfills) * [JavaScript Language Features](#javascript-language-features) * [TypeScript Features](#typescript-features) * [Customizing Babel Config (Advanced)](#customizing-babel-config-advanced) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/04-architecture/supported-browsers.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Architecture](/docs/architecture)Supported Browsers Supported Browsers ================== Next.js supports **modern browsers** with zero configuration. * Chrome 64+ * Edge 79+ * Firefox 67+ * Opera 51+ * Safari 12+ [Browserslist](#browserslist) ----------------------------- If you would like to target specific browsers or features, Next.js supports [Browserslist](https://browsersl.ist) configuration in your `package.json` file. Next.js uses the following Browserslist configuration by default: package.json { "browserslist": [ "chrome 64", "edge 79", "firefox 67", "opera 51", "safari 12" ] } [Polyfills](#polyfills) ----------------------- We inject [widely used polyfills](https://github.com/vercel/next.js/blob/canary/packages/next-polyfill-nomodule/src/index.js), including: * [**fetch()**](https://developer.mozilla.org/docs/Web/API/Fetch_API) — Replacing: `whatwg-fetch` and `unfetch`. * [**URL**](https://developer.mozilla.org/docs/Web/API/URL) — Replacing: the [`url` package (Node.js API)](https://nodejs.org/api/url.html). * [**Object.assign()**](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign) — Replacing: `object-assign`, `object.assign`, and `core-js/object/assign`. If any of your dependencies include these polyfills, they’ll be eliminated automatically from the production build to avoid duplication. In addition, to reduce bundle size, Next.js will only load these polyfills for browsers that require them. The majority of the web traffic globally will not download these polyfills. ### [Custom Polyfills](#custom-polyfills) If your own code or any external npm dependencies require features not supported by your target browsers (such as IE 11), you need to add polyfills yourself. In this case, you should add a top-level import for the **specific polyfill** you need in your [Custom `<App>`](/docs/pages/building-your-application/routing/custom-app) or the individual component. [JavaScript Language Features](#javascript-language-features) ------------------------------------------------------------- Next.js allows you to use the latest JavaScript features out of the box. In addition to [ES6 features](https://github.com/lukehoban/es6features), Next.js also supports: * [Async/await](https://github.com/tc39/ecmascript-asyncawait) (ES2017) * [Object Rest/Spread Properties](https://github.com/tc39/proposal-object-rest-spread) (ES2018) * [Dynamic `import()`](https://github.com/tc39/proposal-dynamic-import) (ES2020) * [Optional Chaining](https://github.com/tc39/proposal-optional-chaining) (ES2020) * [Nullish Coalescing](https://github.com/tc39/proposal-nullish-coalescing) (ES2020) * [Class Fields](https://github.com/tc39/proposal-class-fields) and [Static Properties](https://github.com/tc39/proposal-static-class-features) (ES2022) * and more! ### [TypeScript Features](#typescript-features) Next.js has built-in TypeScript support. [Learn more here](/docs/pages/building-your-application/configuring/typescript). ### [Customizing Babel Config (Advanced)](#customizing-babel-config-advanced) You can customize babel configuration. [Learn more here](/docs/pages/building-your-application/configuring/babel). [Previous Next.js Compiler ](/docs/architecture/nextjs-compiler) [Next Turbopack ](/docs/architecture/turbopack) Was this helpful? supported. Send

https://nextjs.org/learn/react-foundations

React Foundations ================= To effectively learn Next.js, it helps to be familiar with JavaScript, React, and related web development concepts. But JavaScript and React are vast topics. How do you know when you're ready to start using Next.js? Welcome to the React Foundations course! This beginner-friendly, example-led course will guide you through the prerequisite knowledge for Next.js. You will build a simple project step-by-step; starting with a JavaScript application, then migrating it to React and Next.js. Each section builds on the previous one, so you can choose where to start depending on what you already know. ### [Prerequisite knowledge](#prerequisite-knowledge) This tutorial assumes knowledge of HTML, CSS, JavaScript, and no knowledge of React. If you're already familiar with React, you can skip to the [From React to Next.js](/learn/react-foundations/from-react-to-nextjs) chapter or take [Dashboard App](/learn/dashboard-app) course. ### [System requirements](#system-requirements) Before you start this course, make sure you have the following installed: * Node.js 20.12.0 or later installed. * Operating systems: macOS, Windows (including WSL), or Linux. * VSCode or another text editor of your choice. ### [Join the conversation](#join-the-conversation) If you have questions about anything related to Next.js or this course, you're welcome to ask our community on [Discord](https://discord.gg/Q3AsD4efFC). Ready to get started? --------------------- Now that you've been introduced to the course, let's dive in. Next Up 1: About React and Next.js Learn what React and Next.js are, and how they can help you build modern web applications. [Start Chapter 1](/learn/react-foundations/what-is-react-and-nextjs) Was this helpful? supported. Send

https://nextjs.org/docs/community

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Switcher](#ts-and-js-switcher) * [Line Highlighting](#line-highlighting) * [Icons](#icons) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/05-community/01-contribution-guide.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Community](/docs/community)Contribution Guide Docs Contribution Guide ======================= Welcome to the Next.js Docs Contribution Guide! We're excited to have you here. This page provides instructions on how to edit the Next.js documentation. Our goal is to ensure that everyone in the community feels empowered to contribute and improve our docs. [Why Contribute?](#why-contribute) ---------------------------------- Open-source work is never done, and neither is documentation. Contributing to docs is a good way for beginners to get involved in open-source and for experienced developers to clarify more complex topics while sharing their knowledge with the community. By contributing to the Next.js docs, you're helping us build a more robust learning resource for all developers. Whether you've found a typo, a confusing section, or you've realized that a particular topic is missing, your contributions are welcomed and appreciated. [How to Contribute](#how-to-contribute) --------------------------------------- The docs content can be found on the [Next.js repo](https://github.com/vercel/next.js/tree/canary/docs). To contribute, you can edit the files directly on GitHub or clone the repo and edit the files locally. ### [GitHub Workflow](#github-workflow) If you're new to GitHub, we recommend reading the [GitHub Open Source Guide](https://opensource.guide/how-to-contribute/#opening-a-pull-request) to learn how to fork a repository, create a branch, and submit a pull request. > **Good to know**: The underlying docs code lives in a private codebase that is synced to the Next.js public repo. This means that you can't preview the docs locally. However, you'll see your changes on [nextjs.org](https://nextjs.org/docs) after merging a pull request. ### [Writing MDX](#writing-mdx) The docs are written in [MDX](https://mdxjs.com/), a markdown format that supports JSX syntax. This allows us to embed React components in the docs. See the [GitHub Markdown Guide](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) for a quick overview of markdown syntax. ### [VSCode](#vscode) #### [Previewing Changes Locally](#previewing-changes-locally) VSCode has a built-in markdown previewer that you can use to see your edits locally. To enable the previewer for MDX files, you'll need to add a configuration option to your user settings. Open the command palette (`⌘ + ⇧ + P` on Mac or `Ctrl + Shift + P` on Windows) and search from `Preferences: Open User Settings (JSON)`. Then, add the following line to your `settings.json` file: settings.json { "files.associations": { "*.mdx": "markdown" } } Next, open the command palette again, and search for `Markdown: Preview File` or `Markdown: Open Preview to the Side`. This will open a preview window where you can see your formatted changes. #### [Extensions](#extensions) We also recommend the following extensions for VSCode users: * [MDX](https://marketplace.visualstudio.com/items?itemName=unifiedjs.vscode-mdx): Intellisense and syntax highlighting for MDX. * [Grammarly](https://marketplace.visualstudio.com/items?itemName=znck.grammarly): Grammar and spell checker. * [Prettier](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode): Format MDX files on save. ### [Review Process](#review-process) Once you've submitted your contribution, the Next.js or Developer Experience teams will review your changes, provide feedback, and merge the pull request when it's ready. Please let us know if you have any questions or need further assistance in your PR's comments. Thank you for contributing to the Next.js docs and being a part of our community! > **Tip:** Run `pnpm prettier-fix` to run Prettier before submitting your PR. [File Structure](#file-structure) --------------------------------- The docs use **file-system routing**. Each folder and files inside [`/docs`](https://github.com/vercel/next.js/tree/canary/docs) represent a route segment. These segments are used to generate the URL paths, navigation, and breadcrumbs. The file structure reflects the navigation that you see on the site, and by default, navigation items are sorted alphabetically. However, we can change the order of the items by prepending a two-digit number (`00-`) to the folder or file name. For example, in the [functions API Reference](/docs/app/api-reference/functions), the pages are sorted alphabetically because it makes it easier for developers to find a specific function: 03-functions ├── cookies.mdx ├── draft-mode.mdx ├── fetch.mdx └── ... But, in the [routing section](/docs/app/building-your-application/routing), the files are prefixed with a two-digit number, sorted in the order developers should learn these concepts: 02-routing ├── 01-defining-routes.mdx ├── 02-pages-and-layouts.mdx ├── 03-linking-and-navigating.mdx └── ... To quickly find a page, you can use `⌘ + P` (Mac) or `Ctrl + P` (Windows) to open the search bar on VSCode. Then, type the slug of the page you're looking for. E.g. `defining-routes` > **Why not use a manifest?** > > We considered using a manifest file (another popular way to generate the docs navigation), but we found that a manifest would quickly get out of sync with the files. File-system routing forces us to think about the structure of the docs and feels more native to Next.js. [Metadata](#metadata) --------------------- Each page has a metadata block at the top of the file separated by three dashes. ### [Required Fields](#required-fields) The following fields are **required**: Field Description `title` The page's `<h1>` title, used for SEO and OG Images. `description` The page's description, used in the `<meta name="description">` tag for SEO. required-fields.mdx --- title: Page Title description: Page Description --- It's good practice to limit the page title to 2-3 words (e.g. Optimizing Images) and the description to 1-2 sentences (e.g. Learn how to optimize images in Next.js). ### [Optional Fields](#optional-fields) The following fields are **optional**: Field Description `nav_title` Overrides the page's title in the navigation. This is useful when the page's title is too long to fit. If not provided, the `title` field is used. `source` Pulls content into a shared page. See [Shared Pages](#shared-pages). `related` A list of related pages at the bottom of the document. These will automatically be turned into cards. See [Related Links](#related-links). optional-fields.mdx --- nav_title: Nav Item Title source: app/building-your-application/optimizing/images related: description: See the image component API reference. links: - app/api-reference/components/image --- [`App` and `Pages` Docs](#app-and-pages-docs) --------------------------------------------- Since most of the features in the **App Router** and **Pages Router** are completely different, their docs for each are kept in separate sections (`02-app` and `03-pages`). However, there are a few features that are shared between them. ### [Shared Pages](#shared-pages) To avoid content duplication and risk the content becoming out of sync, we use the `source` field to pull content from one page into another. For example, the `<Link>` component behaves _mostly_ the same in **App** and **Pages**. Instead of duplicating the content, we can pull the content from `app/.../link.mdx` into `pages/.../link.mdx`: app/.../link.mdx --- title: <Link> description: API reference for the <Link> component. --- This API reference will help you understand how to use the props and configuration options available for the Link Component. pages/.../link.mdx --- title: <Link> description: API reference for the <Link> component. source: app/api-reference/components/link --- {/* DO NOT EDIT THIS PAGE. */} {/* The content of this page is pulled from the source above. */} We can therefore edit the content in one place and have it reflected in both sections. ### [Shared Content](#shared-content) In shared pages, sometimes there might be content that is **App Router** or **Pages Router** specific. For example, the `<Link>` component has a `shallow` prop that is only available in **Pages** but not in **App**. To make sure the content only shows in the correct router, we can wrap content blocks in an `<AppOnly>` or `<PagesOnly>` components: app/.../link.mdx This content is shared between App and Pages. <PagesOnly> This content will only be shown on the Pages docs. </PagesOnly> This content is shared between App and Pages. You'll likely use these components for examples and code blocks. [Code Blocks](#code-blocks) --------------------------- Code blocks should contain a minimum working example that can be copied and pasted. This means that the code should be able to run without any additional configuration. For example, if you're showing how to use the `<Link>` component, you should include the `import` statement and the `<Link>` component itself. app/page.tsx import Link from 'next/link' export default function Page() { return <Link href="/about">About</Link> } Always run examples locally before committing them. This will ensure that the code is up-to-date and working. ### [Language and Filename](#language-and-filename) Code blocks should have a header that includes the language and the `filename`. Add a `filename` prop to render a special Terminal icon that helps orientate users where to input the command. For example: code-example.mdx ```bash filename="Terminal" npx create-next-app ``` Most examples in the docs are written in `tsx` and `jsx`, and a few in `bash`. However, you can use any supported language, here's the [full list](https://github.com/shikijs/shiki/blob/main/docs/languages.md#all-languages). When writing JavaScript code blocks, we use the following language and extension combinations. Language Extension JavaScript files with JSX code \`\`\`jsx .js JavaScript files without JSX \`\`\`js .js TypeScript files with JSX \`\`\`tsx .tsx TypeScript files without JSX \`\`\`ts .ts ### [TS and JS Switcher](#ts-and-js-switcher) Add a language switcher to toggle between TypeScript and JavaScript. Code blocks should be TypeScript first with a JavaScript version to accommodate users. Currently, we write TS and JS examples one after the other, and link them with `switcher` prop: code-example.mdx ```tsx filename="app/page.tsx" switcher ``` ```jsx filename="app/page.js" switcher ``` > **Good to know**: We plan to automatically compile TypeScript snippets to JavaScript in the future. In the meantime, you can use [transform.tools](https://transform.tools/typescript-to-javascript). ### [Line Highlighting](#line-highlighting) Code lines can be highlighted. This is useful when you want to draw attention to a specific part of the code. You can highlight lines by passing a number to the `highlight` prop. **Single Line:** `highlight={1}` app/page.tsx import Link from 'next/link' export default function Page() { return <Link href="/about">About</Link> } **Multiple Lines:** `highlight={1,3}` app/page.tsx import Link from 'next/link' export default function Page() { return <Link href="/about">About</Link> } **Range of Lines:** `highlight={1-5}` app/page.tsx import Link from 'next/link' export default function Page() { return <Link href="/about">About</Link> } [Icons](#icons) --------------- The following icons are available for use in the docs: mdx-icon.mdx <Check size={18} /> <Cross size={18} /> **Output:** We do not use emojis in the docs. [Notes](#notes) --------------- For information that is important but not critical, use notes. Notes are a good way to add information without distracting the user from the main content. notes.mdx > **Good to know**: This is a single line note. > **Good to know**: > > - We also use this format for multi-line notes. > - There are sometimes multiple items worth knowing or keeping in mind. **Output:** > **Good to know**: This is a single line note. > **Good to know**: > > * We also use this format for multi-line notes. > * There are sometimes multiple item worths knowing or keeping in mind. [Related Links](#related-links) ------------------------------- Related Links guide the user's learning journey by adding links to logical next steps. * Links will be displayed in cards under the main content of the page. * Links will be automatically generated for pages that have child pages. For example, the [Optimizing](/docs/app/building-your-application/optimizing) section has links to all of its child pages. Create related links using the `related` field in the page's metadata. example.mdx --- related: description: Learn how to quickly get started with your first application. links: - app/building-your-application/routing/defining-routes - app/building-your-application/data-fetching - app/api-reference/file-conventions/page --- ### [Nested Fields](#nested-fields) Field Required? Description `title` Optional The title of the card list. Defaults to **Next Steps**. `description` Optional The description of the card list. `links` Required A list of links to other doc pages. Each list item should be a relative URL path (without a leading slash) e.g. `app/api-reference/file-conventions/page` [Diagrams](#diagrams) --------------------- Diagrams are a great way to explain complex concepts. We use [Figma](https://www.figma.com/) to create diagrams, following Vercel's design guide. The diagrams currently live in the `/public` folder in our private Next.js site. If you'd like to update or add a diagram, please open a [GitHub issue](https://github.com/vercel/next.js/issues/new?assignees=&labels=template%3A+documentation&projects=&template=4.docs_request.yml&title=Docs%3A+) with your ideas. [Custom Components and HTML](#custom-components-and-html) --------------------------------------------------------- These are the React Components available for the docs: `<Image />` (next/image), `<PagesOnly />`, `<AppOnly />`, `<Cross />`, and `<Check />`. We do not allow raw HTML in the docs besides the `<details>` tag. If you have ideas for new components, please open a [GitHub issue](https://github.com/vercel/next.js/issues/new/choose). [Style Guide](#style-guide) --------------------------- This section contains guidelines for writing docs for those who are new to technical writing. ### [Page Templates](#page-templates) While we don't have a strict template for pages, there are page sections you'll see repeated across the docs: * **Overview:** The first paragraph of a page should tell the user what the feature is and what it's used for. Followed by a minimum working example or its API reference. * **Convention:** If the feature has a convention, it should be explained here. * **Examples**: Show how the feature can be used with different use cases. * **API Tables**: API Pages should have an overview table at the of the page with jump-to-section links (when possible). * **Next Steps (Related Links)**: Add links to related pages to guide the user's learning journey. Feel free to add these sections as needed. ### [Page Types](#page-types) Docs pages are also split into two categories: Conceptual and Reference. * **Conceptual** pages are used to explain a concept or feature. They are usually longer and contain more information than reference pages. In the Next.js docs, conceptual pages are found in the **Building Your Application** section. * **Reference** pages are used to explain a specific API. They are usually shorter and more focused. In the Next.js docs, reference pages are found in the **API Reference** section. > **Good to know**: Depending on the page you're contributing to, you may need to follow a different voice and style. For example, conceptual pages are more instructional and use the word _you_ to address the user. Reference pages are more technical, they use more imperative words like "create, update, accept" and tend to omit the word _you_. ### [Voice](#voice) Here are some guidelines to maintain a consistent style and voice across the docs: * Write clear, concise sentences. Avoid tangents. * If you find yourself using a lot of commas, consider breaking the sentence into multiple sentences or use a list. * Swap out complex words for simpler ones. For example, _use_ instead of _utilize_. * Be mindful with the word _this_. It can be ambiguous and confusing, don't be afraid to repeat the subject of the sentence if unclear. * For example, _Next.js uses React_ instead of _Next.js uses this_. * Use an active voice instead of passive. An active sentence is easier to read. * For example, _Next.js uses React_ instead of _React is used by Next.js_. If you find yourself using words like _was_ and _by_ you may be using a passive voice. * Avoid using words like _easy_, _quick_, _simple_, _just_, etc. This is subjective and can be discouraging to users. * Avoid negative words like _don't_, _can't_, _won't_, etc. This can be discouraging to readers. * For example, _"You can use the `Link` component to create links between pages"_ instead of _"Don't use the `<a>` tag to create links between pages"_. * Write in second person (you/your). This is more personal and engaging. * Use gender-neutral language. Use _developers_, _users_, or _readers_, when referring to the audience. * If adding code examples, ensure they are properly formatted and working. While these guidelines are not exhaustive, they should help you get started. If you'd like to dive deeper into technical writing, check out the [Google Technical Writing Course](https://developers.google.com/tech-writing/overview). * * * Thank you for contributing to the docs and being part of the Next.js community! [Previous Community ](/docs/community) Was this helpful? supported. Send

https://nextjs.org/learn/dashboard-app

Learn Next.js ============= Welcome to the Next.js App Router course! In this free interactive course, you'll learn the main features of Next.js by building a full-stack web application. [What we'll be building](#what-well-be-building) ------------------------------------------------  For this course, we'll be building a simplified version of the financial dashboard that has: * A public home page. * A login page. * Dashboard pages that are protected by authentication. * The ability for users to add, edit, and delete invoices. The dashboard will also have an accompanying database, which you'll set up in [a later chapter](/learn/dashboard-app/setting-up-your-database). By the end of the course, you'll have the essential skills needed to start building full-stack Next.js applications. [Overview](#overview) --------------------- Here's an overview of features you'll learn about in this course: * **Styling**: The different ways to style your application in Next.js. * **Optimizations**: How to optimize images, links, and fonts. * **Routing**: How to create nested layouts and pages using file-system routing. * **Data Fetching**: How to set up a database on Vercel, and best practices for fetching and streaming. * **Search and Pagination**: How to implement search and pagination using URL Search Params. * **Mutating Data:** How to mutate data using React Server Actions, and revalidate the Next.js cache. * **Error Handling:** How to handle general and `404` not found errors. * **Form Validation and Accessibility:** How to do server-side form validation and tips for improving accessibility. * **Authentication**: How to add authentication to your application using [`NextAuth.js`](https://next-auth.js.org/) and Middleware. * **Metadata**: How to add metadata and prepare your application for social sharing. [Prerequisite knowledge](#prerequisite-knowledge) ------------------------------------------------- This course assumes you have a basic understanding of React and JavaScript. If you're new to React, we recommend going through our [React Foundations](/learn/react-foundations) course first to learn the fundamentals of React, such as components, props, state, and hooks, and newer features like Server Components and Suspense. [System requirements](#system-requirements) ------------------------------------------- Before you start this course, make sure your system meets the following requirements: * Node.js 18.17.0 or later installed. [Download here](https://nodejs.org/en). * Operating systems: macOS, Windows (including WSL), or Linux. In addition, you'll also need a [GitHub Account](https://github.com/join/) and a [Vercel Account](https://vercel.com/signup). [Join the conversation](#join-the-conversation) ----------------------------------------------- If you have questions about this course or would like to provide feedback, you can ask our community on [Discord](https://discord.com/invite/Q3AsD4efFC) or [GitHub](https://github.com/vercel/next-learn). Ready to get started? --------------------- Now that you've been introduced to the course, let's dive in. Next Up 1: Getting Started Learn how to create a Next.js application and run your local development server. [Start Chapter 1](/learn/dashboard-app/getting-started) Was this helpful? supported. Send

https://nextjs.org/docs/pages/api-reference/next-config-js/pageExtensions

Menu Using Pages Router Features available in /pages * [Getting Started](/docs/getting-started) * [Installation](/docs/getting-started/installation) * [Project Structure](/docs/getting-started/project-structure) * [Building Your Application](/docs/app/building-your-application) * [Routing](/docs/app/building-your-application/routing) * [Defining Routes](/docs/app/building-your-application/routing/defining-routes) * [Pages and Layouts](/docs/app/building-your-application/routing/pages-and-layouts) * [Linking and Navigating](/docs/app/building-your-application/routing/linking-and-navigating) * [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [Error Handling](/docs/app/building-your-application/routing/error-handling) * [Redirecting](/docs/app/building-your-application/routing/redirecting) * [Route Groups](/docs/app/building-your-application/routing/route-groups) * [Project Organization](/docs/app/building-your-application/routing/colocation) * [Dynamic Routes](/docs/app/building-your-application/routing/dynamic-routes) * [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) * [Intercepting Routes](/docs/app/building-your-application/routing/intercepting-routes) * [Route Handlers](/docs/app/building-your-application/routing/route-handlers) * [Middleware](/docs/app/building-your-application/routing/middleware) * [Internationalization](/docs/app/building-your-application/routing/internationalization) * [Data Fetching](/docs/app/building-your-application/data-fetching) * [Fetching, Caching, and Revalidating](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) * [Server Actions and Mutations](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) * [Data Fetching Patterns and Best Practices](/docs/app/building-your-application/data-fetching/patterns) * [Rendering](/docs/app/building-your-application/rendering) * [Server Components](/docs/app/building-your-application/rendering/server-components) * [Client Components](/docs/app/building-your-application/rendering/client-components) * [Composition Patterns](/docs/app/building-your-application/rendering/composition-patterns) * [Edge and Node.js Runtimes](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) * [Caching](/docs/app/building-your-application/caching) * [Styling](/docs/app/building-your-application/styling) * [CSS Modules](/docs/app/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/app/building-your-application/styling/css-in-js) * [Sass](/docs/app/building-your-application/styling/sass) * [Optimizing](/docs/app/building-your-application/optimizing) * [Images](/docs/app/building-your-application/optimizing/images) * [Videos](/docs/app/building-your-application/optimizing/videos) * [Fonts](/docs/app/building-your-application/optimizing/fonts) * [Metadata](/docs/app/building-your-application/optimizing/metadata) * [Scripts](/docs/app/building-your-application/optimizing/scripts) * [Bundle Analyzer](/docs/app/building-your-application/optimizing/bundle-analyzer) * [Lazy Loading](/docs/app/building-your-application/optimizing/lazy-loading) * [Analytics](/docs/app/building-your-application/optimizing/analytics) * [Instrumentation](/docs/app/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/app/building-your-application/optimizing/open-telemetry) * [Static Assets](/docs/app/building-your-application/optimizing/static-assets) * [Third Party Libraries](/docs/app/building-your-application/optimizing/third-party-libraries) * [Memory Usage](/docs/app/building-your-application/optimizing/memory-usage) * [Configuring](/docs/app/building-your-application/configuring) * [TypeScript](/docs/app/building-your-application/configuring/typescript) * [ESLint](/docs/app/building-your-application/configuring/eslint) * [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases) * [MDX](/docs/app/building-your-application/configuring/mdx) * [src Directory](/docs/app/building-your-application/configuring/src-directory) * [Draft Mode](/docs/app/building-your-application/configuring/draft-mode) * [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) * [Testing](/docs/app/building-your-application/testing) * [Vitest](/docs/app/building-your-application/testing/vitest) * [Jest](/docs/app/building-your-application/testing/jest) * [Playwright](/docs/app/building-your-application/testing/playwright) * [Cypress](/docs/app/building-your-application/testing/cypress) * [Authentication](/docs/app/building-your-application/authentication) * [Deploying](/docs/app/building-your-application/deploying) * [Production Checklist](/docs/app/building-your-application/deploying/production-checklist) * [Static Exports](/docs/app/building-your-application/deploying/static-exports) * [Upgrading](/docs/app/building-your-application/upgrading) * [Codemods](/docs/app/building-your-application/upgrading/codemods) * [App Router Migration](/docs/app/building-your-application/upgrading/app-router-migration) * [Version 14](/docs/app/building-your-application/upgrading/version-14) * [Migrating from Vite](/docs/app/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/app/building-your-application/upgrading/from-create-react-app) * [API Reference](/docs/app/api-reference) * [Components](/docs/app/api-reference/components) * [Font](/docs/app/api-reference/components/font) * [<Image>](/docs/app/api-reference/components/image) * [<Link>](/docs/app/api-reference/components/link) * [<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, icon, and apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Including non-page files in the pages directory](#including-non-page-files-in-the-pages-directory) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/pageExtensions.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)pageExtensions pageExtensions ============== You can extend the default Page extensions (`.tsx`, `.ts`, `.jsx`, `.js`) used by Next.js. Inside `next.config.js`, add the `pageExtensions` config: next.config.js module.exports = { pageExtensions: ['mdx', 'md', 'jsx', 'js', 'tsx', 'ts'], } Changing these values affects _all_ Next.js pages, including the following: * [`middleware.js`](/docs/pages/building-your-application/routing/middleware) * [`instrumentation.js`](/docs/pages/building-your-application/optimizing/instrumentation) * `pages/_document.js` * `pages/_app.js` * `pages/api/` For example, if you reconfigure `.ts` page extensions to `.page.ts`, you would need to rename pages like `middleware.page.ts`, `instrumentation.page.ts`, `_app.page.ts`. [Including non-page files in the `pages` directory](#including-non-page-files-in-the-pages-directory) ----------------------------------------------------------------------------------------------------- You can colocate test files or other files used by components in the `pages` directory. Inside `next.config.js`, add the `pageExtensions` config: next.config.js module.exports = { pageExtensions: ['page.tsx', 'page.ts', 'page.jsx', 'page.js'], } Then, rename your pages to have a file extension that includes `.page` (e.g. rename `MyPage.tsx` to `MyPage.page.tsx`). Ensure you rename _all_ Next.js pages, including the files mentioned above. [Previous output ](/docs/pages/api-reference/next-config-js/output) [Next poweredByHeader ](/docs/pages/api-reference/next-config-js/poweredByHeader) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Disabling compression](#disabling-compression) * [Changing the compression algorithm](#changing-the-compression-algorithm) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/optimizePackageImports.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)optimizePackageImports optimizePackageImports ====================== By default, Next.js uses `gzip` to compress rendered content and static files when using `next start` or a custom server. This is an optimization for applications that do not have compression configured. If compression is _already_ configured in your application via a custom server, Next.js will not add compression. > **Good to know:** > > * When hosting your application on [Vercel](https://vercel.com/docs/edge-network/compression), compression uses `brotli` first, then `gzip`. > * You can check if compression is enabled and which algorithm is used by looking at the [`Accept-Encoding`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding) (browser accepted options) and [`Content-Encoding`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding) (currently used) headers in the response. [Disabling compression](#disabling-compression) ----------------------------------------------- To disable **compression**, set the `compress` config option to `false`: next.config.js module.exports = { compress: false, } We do not recommend disabling compression unless you have compression configured on your server, as compression reduces bandwidth usage and improves the performance of your application. [Changing the compression algorithm](#changing-the-compression-algorithm) ------------------------------------------------------------------------- To change your compression algorithm, you will need to configure your custom server and set the `compress` option to `false` in your `next.config.js` file. For example, you're using [nginx](https://www.nginx.com/) and want to switch to `brotli`, set the `compress` option to `false` to allow nginx to handle compression. > **Good to know:** > > * For Next.js applications on Vercel, compression is handled by the Vercel's Edge Network and not Next.js. See the [Vercel documentation](https://vercel.com/docs/edge-network/compression) for more information. [Previous onDemandEntries ](/docs/pages/api-reference/next-config-js/onDemandEntries) [Next output ](/docs/pages/api-reference/next-config-js/output) Was this helpful? supported. Send

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[turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party 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Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [ output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [How it Works](#how-it-works) * [Automatically Copying Traced Files](#automatically-copying-traced-files) * [Caveats](#caveats) * [Experimental turbotrace](#experimental-turbotrace) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/output.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)output output ====== During a build, Next.js will automatically trace each page and its dependencies to determine all of the files that are needed for deploying a production version of your application. This feature helps reduce the size of deployments drastically. Previously, when deploying with Docker you would need to have all files from your package's `dependencies` installed to run `next start`. Starting with Next.js 12, you can leverage Output File Tracing in the `.next/` directory to only include the necessary files. Furthermore, this removes the need for the deprecated `serverless` target which can cause various issues and also creates unnecessary duplication. [How it Works](#how-it-works) ----------------------------- During `next build`, Next.js will use [`@vercel/nft`](https://github.com/vercel/nft) to statically analyze `import`, `require`, and `fs` usage to determine all files that a page might load. Next.js' production server is also traced for its needed files and output at `.next/next-server.js.nft.json` which can be leveraged in production. To leverage the `.nft.json` files emitted to the `.next` output directory, you can read the list of files in each trace that are relative to the `.nft.json` file and then copy them to your deployment location. [Automatically Copying Traced Files](#automatically-copying-traced-files) ------------------------------------------------------------------------- Next.js can automatically create a `standalone` folder that copies only the necessary files for a production deployment including select files in `node_modules`. To leverage this automatic copying you can enable it in your `next.config.js`: next.config.js module.exports = { output: 'standalone', } This will create a folder at `.next/standalone` which can then be deployed on its own without installing `node_modules`. Additionally, a minimal `server.js` file is also output which can be used instead of `next start`. This minimal server does not copy the `public` or `.next/static` folders by default as these should ideally be handled by a CDN instead, although these folders can be copied to the `standalone/public` and `standalone/.next/static` folders manually, after which `server.js` file will serve these automatically. > **Good to know**: > > * `next.config.js` is read during `next build` and serialized into the `server.js` output file. If the legacy [`serverRuntimeConfig` or `publicRuntimeConfig` options](/docs/pages/api-reference/next-config-js/runtime-configuration) are being used, the values will be specific to values at build time. > * If your project needs to listen to a specific port or hostname, you can define `PORT` or `HOSTNAME` environment variables before running `server.js`. For example, run `PORT=8080 HOSTNAME=0.0.0.0 node server.js` to start the server on `http://0.0.0.0:8080`. > * If your project uses [Image Optimization](/docs/pages/building-your-application/optimizing/images) with the default `loader`, you must install `sharp` as a dependency: Terminal npm i sharp Terminal yarn add sharp Terminal pnpm add sharp Terminal bun add sharp [Caveats](#caveats) ------------------- * While tracing in monorepo setups, the project directory is used for tracing by default. For `next build packages/web-app`, `packages/web-app` would be the tracing root and any files outside of that folder will not be included. To include files outside of this folder you can set `experimental.outputFileTracingRoot` in your `next.config.js`. packages/web-app/next.config.js module.exports = { experimental: { // this includes files from the monorepo base two directories up outputFileTracingRoot: path.join(__dirname, '../../'), }, } * There are some cases in which Next.js might fail to include required files, or might incorrectly include unused files. In those cases, you can leverage `experimental.outputFileTracingExcludes` and `experimental.outputFileTracingIncludes` respectively in `next.config.js`. Each config accepts an object with [minimatch globs](https://www.npmjs.com/package/minimatch) for the key to match specific pages and a value of an array with globs relative to the project's root to either include or exclude in the trace. next.config.js module.exports = { experimental: { outputFileTracingExcludes: { '/api/hello': ['./un-necessary-folder/**/*'], }, outputFileTracingIncludes: { '/api/another': ['./necessary-folder/**/*'], }, }, } * Currently, Next.js does not do anything with the emitted `.nft.json` files. The files must be read by your deployment platform, for example [Vercel](https://vercel.com), to create a minimal deployment. In a future release, a new command is planned to utilize these `.nft.json` files. [Experimental `turbotrace`](#experimental-turbotrace) ----------------------------------------------------- Tracing dependencies can be slow because it requires very complex computations and analysis. We created `turbotrace` in Rust as a faster and smarter alternative to the JavaScript implementation. To enable it, you can add the following configuration to your `next.config.js`: next.config.js module.exports = { experimental: { turbotrace: { // control the log level of the turbotrace, default is `error` logLevel?: | 'bug' | 'fatal' | 'error' | 'warning' | 'hint' | 'note' | 'suggestions' | 'info', // control if the log of turbotrace should contain the details of the analysis, default is `false` logDetail?: boolean // show all log messages without limit // turbotrace only show 1 log message for each categories by default logAll?: boolean // control the context directory of the turbotrace // files outside of the context directory will not be traced // set the `experimental.outputFileTracingRoot` has the same effect // if the `experimental.outputFileTracingRoot` and this option are both set, the `experimental.turbotrace.contextDirectory` will be used contextDirectory?: string // if there is `process.cwd()` expression in your code, you can set this option to tell `turbotrace` the value of `process.cwd()` while tracing. // for example the require(process.cwd() + '/package.json') will be traced as require('/path/to/cwd/package.json') processCwd?: string // control the maximum memory usage of the `turbotrace`, in `MB`, default is `6000`. memoryLimit?: number }, }, } [Previous optimizePackageImports ](/docs/pages/api-reference/next-config-js/optimizePackageImports) [Next pageExtensions ](/docs/pages/api-reference/next-config-js/pageExtensions) Was this helpful? supported. 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https://nextjs.org/telemetry

Telemetry ========= Next.js collects **completely anonymous** telemetry data about general usage. Participation in this anonymous program is optional, and you may opt-out if you'd not like to share any information. [Why is telemetry collected?](#why-is-telemetry-collected) ---------------------------------------------------------- Next.js has grown considerably since its release, becoming the de-facto React Framework for developers. Prior to telemetry collection, making decisions about how to improve Next.js was a very manual process. For example, Vercel [dogfoods](https://en.wikipedia.org/wiki/Eating_your_own_dog_food) many large React applications (including the Next.js website). Additionally, we actively engage with the community to gather feedback. However, this approach only allows us to collect feedback from a subset of users. This subset may have different needs and use cases than you. Telemetry allows us to accurately gauge Next.js feature usage, pain points, and customization across all users. This data will let us better tailor Next.js to the masses, ensuring its continued growth, relevance, and best-in-class developer experience. Furthermore, this will allow us to verify if improvements made to the framework are improving the baseline of all applications. [What is being collected?](#what-is-being-collected) ---------------------------------------------------- We track general usage information, such as Next.js plugins and build performance. Specifically, we track the following anonymously: * Command invoked (`next build`, `next dev`, or `next export`) * Version of Next.js * General machine information (e.g. number of CPUs, macOS/Windows/Linux, whether or not the command was run within CI) * What Next.js plugins are present in your project * Duration of `next build` and size of application (total number of pages) > **Note**: This list is regularly audited to ensure its accuracy. You can view exactly what is being collected by setting the following environment variable: `NEXT_TELEMETRY_DEBUG=1`. When this environment variable is set, data will **not be sent to us**. The data will only be printed out to the [_stderr_ stream](https://en.wikipedia.org/wiki/Standard_streams), prefixed with `[telemetry]`. An example telemetry event looks like this: { "eventName": "NEXT_VERSION", "payload": { "version": "9.0.5-canary.2", "isDevelopment": false } } [What about sensitive data (e.g. secrets)?](#what-about-sensitive-data-eg-secrets) ---------------------------------------------------------------------------------- We **do not** collect any metrics which may contain sensitive data. This includes, but is not limited to: environment variables, file paths, contents of files, logs, or serialized JavaScript errors. We take privacy and our security very seriously. Next.js telemetry falls under the [security disclosure policy](https://vercel.com/security). [Will this data be shared?](#will-this-data-be-shared) ------------------------------------------------------ The data we collect is completely anonymous, not traceable to the source, and only meaningful in aggregate form. **No data we collect is personally identifiable.** [How do I opt-out?](#how-do-i-opt-out) -------------------------------------- You may opt out-by running `next telemetry disable` in the root of your project directory: npx next telemetry disable yarn next telemetry disable pnpm exec next telemetry disable bun next telemetry disable You may check the status of telemetry collection at any time by running `next telemetry status` in the root of your project directory: npx next telemetry status yarn next telemetry status pnpm exec next telemetry status bun next telemetry status You may re-enable telemetry if you'd like to re-join the program by running the following in the root of your project directory: npx next telemetry enable yarn next telemetry enable pnpm exec next telemetry enable bun next telemetry enable You may also opt-out by setting an environment variable: `NEXT_TELEMETRY_DISABLED=1`.

https://nextjs.org/docs/app

Menu Using App Router Features available in /app * [Getting Started](/docs/getting-started) * [Installation](/docs/getting-started/installation) * [Project Structure](/docs/getting-started/project-structure) * [Building Your Application](/docs/app/building-your-application) * [Routing](/docs/app/building-your-application/routing) * [Defining Routes](/docs/app/building-your-application/routing/defining-routes) * [Pages and Layouts](/docs/app/building-your-application/routing/pages-and-layouts) * [Linking and Navigating](/docs/app/building-your-application/routing/linking-and-navigating) * [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [Error Handling](/docs/app/building-your-application/routing/error-handling) * [Redirecting](/docs/app/building-your-application/routing/redirecting) * [Route Groups](/docs/app/building-your-application/routing/route-groups) * [Project Organization](/docs/app/building-your-application/routing/colocation) * [Dynamic Routes](/docs/app/building-your-application/routing/dynamic-routes) * [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) * [Intercepting Routes](/docs/app/building-your-application/routing/intercepting-routes) * [Route Handlers](/docs/app/building-your-application/routing/route-handlers) * [Middleware](/docs/app/building-your-application/routing/middleware) * [Internationalization](/docs/app/building-your-application/routing/internationalization) * [Data Fetching](/docs/app/building-your-application/data-fetching) * [Fetching, Caching, and Revalidating](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) * [Server Actions and Mutations](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) * [Data Fetching Patterns and Best Practices](/docs/app/building-your-application/data-fetching/patterns) * [Rendering](/docs/app/building-your-application/rendering) * [Server Components](/docs/app/building-your-application/rendering/server-components) * [Client Components](/docs/app/building-your-application/rendering/client-components) * [Composition Patterns](/docs/app/building-your-application/rendering/composition-patterns) * [Edge and Node.js Runtimes](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) * [Caching](/docs/app/building-your-application/caching) * [Styling](/docs/app/building-your-application/styling) * [CSS Modules](/docs/app/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/app/building-your-application/styling/css-in-js) * [Sass](/docs/app/building-your-application/styling/sass) * [Optimizing](/docs/app/building-your-application/optimizing) * [Images](/docs/app/building-your-application/optimizing/images) * [Videos](/docs/app/building-your-application/optimizing/videos) * [Fonts](/docs/app/building-your-application/optimizing/fonts) * [Metadata](/docs/app/building-your-application/optimizing/metadata) * [Scripts](/docs/app/building-your-application/optimizing/scripts) * [Bundle Analyzer](/docs/app/building-your-application/optimizing/bundle-analyzer) * [Lazy Loading](/docs/app/building-your-application/optimizing/lazy-loading) * [Analytics](/docs/app/building-your-application/optimizing/analytics) * [Instrumentation](/docs/app/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/app/building-your-application/optimizing/open-telemetry) * [Static Assets](/docs/app/building-your-application/optimizing/static-assets) * [Third Party Libraries](/docs/app/building-your-application/optimizing/third-party-libraries) * [Memory Usage](/docs/app/building-your-application/optimizing/memory-usage) * [Configuring](/docs/app/building-your-application/configuring) * [TypeScript](/docs/app/building-your-application/configuring/typescript) * [ESLint](/docs/app/building-your-application/configuring/eslint) * [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases) * [MDX](/docs/app/building-your-application/configuring/mdx) * [src Directory](/docs/app/building-your-application/configuring/src-directory) * [Draft Mode](/docs/app/building-your-application/configuring/draft-mode) * [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) * [Testing](/docs/app/building-your-application/testing) * [Vitest](/docs/app/building-your-application/testing/vitest) * [Jest](/docs/app/building-your-application/testing/jest) * [Playwright](/docs/app/building-your-application/testing/playwright) * [Cypress](/docs/app/building-your-application/testing/cypress) * [Authentication](/docs/app/building-your-application/authentication) * [Deploying](/docs/app/building-your-application/deploying) * [Production Checklist](/docs/app/building-your-application/deploying/production-checklist) * [Static Exports](/docs/app/building-your-application/deploying/static-exports) * [Upgrading](/docs/app/building-your-application/upgrading) * [Codemods](/docs/app/building-your-application/upgrading/codemods) * [App Router Migration](/docs/app/building-your-application/upgrading/app-router-migration) * [Version 14](/docs/app/building-your-application/upgrading/version-14) * [Migrating from Vite](/docs/app/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/app/building-your-application/upgrading/from-create-react-app) * [API Reference](/docs/app/api-reference) * [Components](/docs/app/api-reference/components) * [Font](/docs/app/api-reference/components/font) * [<Image>](/docs/app/api-reference/components/image) * [<Link>](/docs/app/api-reference/components/link) * [<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, icon, and apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Frequently Asked Questions](#frequently-asked-questions) * [How can I access the request object in a layout?](#how-can-i-access-the-request-object-in-a-layout) * [How can I access the URL on a page?](#how-can-i-access-the-url-on-a-page) * [How can I redirect from a Server Component?](#how-can-i-redirect-from-a-server-component) * [How can I handle authentication with the App Router?](#how-can-i-handle-authentication-with-the-app-router) * [How can I set cookies?](#how-can-i-set-cookies) * [How can I build multi-tenant apps?](#how-can-i-build-multi-tenant-apps) * [How can I invalidate the App Router cache?](#how-can-i-invalidate-the-app-router-cache) * [Are there any comprehensive, open-source applications built on the App Router?](#are-there-any-comprehensive-open-source-applications-built-on-the-app-router) * [Learn More](#learn-more) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top App Router ========== The Next.js App Router introduces a new model for building applications using React's latest features such as [Server Components](/docs/app/building-your-application/rendering/server-components), [Streaming with Suspense](/docs/app/building-your-application/routing/loading-ui-and-streaming#streaming-with-suspense), and [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). Get started with the App Router by [creating your first page](/docs/app/building-your-application/routing/pages-and-layouts). [Frequently Asked Questions](#frequently-asked-questions) --------------------------------------------------------- ### [How can I access the request object in a layout?](#how-can-i-access-the-request-object-in-a-layout) You intentionally cannot access the raw request object. However, you can access [`headers`](/docs/app/api-reference/functions/headers) and [`cookies`](/docs/app/api-reference/functions/cookies) through server-only functions. You can also [set cookies](#how-can-i-set-cookies). [Layouts](/docs/app/building-your-application/routing/pages-and-layouts#layouts) do not rerender. They can be cached and reused to avoid unnecessary computation when navigating between pages. By restricting layouts from accessing the raw request, Next.js can prevent the execution of potentially slow or expensive user code within the layout, which could negatively impact performance. This design also enforces consistent and predictable behavior for layouts across different pages, which simplifies development and debugging. Depending on the UI pattern you're building, [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) allow you to render multiple pages in the same layout, and pages have access to the route segments as well as the URL search params. ### [How can I access the URL on a page?](#how-can-i-access-the-url-on-a-page) By default, pages are Server Components. You can access the route segments through the [`params`](/docs/app/api-reference/file-conventions/page#params-optional) prop and the URL search params through the [`searchParams`](/docs/app/api-reference/file-conventions/page#searchparams-optional) prop for a given page. If you are using Client Components, you can use [`usePathname`](/docs/app/api-reference/functions/use-pathname), [`useSelectedLayoutSegment`](/docs/app/api-reference/functions/use-selected-layout-segment), and [`useSelectedLayoutSegments`](/docs/app/api-reference/functions/use-selected-layout-segments) for more complex routes. Further, depending on the UI pattern you're building, [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) allow you to render multiple pages in the same layout, and pages have access to the route segments as well as the URL search params. ### [How can I redirect from a Server Component?](#how-can-i-redirect-from-a-server-component) You can use [`redirect`](/docs/app/api-reference/functions/redirect) to redirect from a page to a relative or absolute URL. [`redirect`](/docs/app/api-reference/functions/redirect) is a temporary (307) redirect, while [`permanentRedirect`](/docs/app/api-reference/functions/permanentRedirect) is a permanent (308) redirect. When these functions are used while streaming UI, they will insert a meta tag to emit the redirect on the client side. ### [How can I handle authentication with the App Router?](#how-can-i-handle-authentication-with-the-app-router) Here are some common authentication solutions that support the App Router: * [NextAuth.js](https://next-auth.js.org/configuration/nextjs#in-app-router) * [Clerk](https://clerk.com/docs/quickstarts/nextjs) * [Lucia](https://lucia-auth.com/getting-started/nextjs-app) * [Auth0](https://github.com/auth0/nextjs-auth0#app-router) * [Stytch](https://stytch.com/docs/example-apps/frontend/nextjs) * [Kinde](https://kinde.com/docs/developer-tools/nextjs-sdk/) * Or manually handling sessions or JWTs ### [How can I set cookies?](#how-can-i-set-cookies) You can set cookies in [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations#cookies) or [Route Handlers](/docs/app/building-your-application/routing/route-handlers) using the [`cookies`](/docs/app/api-reference/functions/cookies) function. Since HTTP does not allow setting cookies after streaming starts, you cannot set cookies from a page or layout directly. You can also set cookies from [Middleware](/docs/app/building-your-application/routing/middleware#using-cookies). ### [How can I build multi-tenant apps?](#how-can-i-build-multi-tenant-apps) If you are looking to build a single Next.js application that serves multiple tenants, we have [built an example](https://vercel.com/templates/next.js/platforms-starter-kit) showing our recommended architecture. ### [How can I invalidate the App Router cache?](#how-can-i-invalidate-the-app-router-cache) There are multiple layers of caching in Next.js, and thus, multiple ways to invalidate different parts of the cache. [Learn more about caching](/docs/app/building-your-application/caching). ### [Are there any comprehensive, open-source applications built on the App Router?](#are-there-any-comprehensive-open-source-applications-built-on-the-app-router) Yes. You can view [Next.js Commerce](https://vercel.com/templates/next.js/nextjs-commerce) or the [Platforms Starter Kit](https://vercel.com/templates/next.js/platforms-starter-kit) for two larger examples of using the App Router that are open-source. [Learn More](#learn-more) ------------------------- * [Routing Fundamentals](/docs/app/building-your-application/routing) * [Data Fetching, Caching, and Revalidating](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) * [Forms and Mutations](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) * [Caching](/docs/app/building-your-application/caching) * [Rendering Fundamentals](/docs/app/building-your-application/rendering) * [Server Components](/docs/app/building-your-application/rendering/server-components) * [Client Components](/docs/app/building-your-application/rendering/client-components) [ ### Building Your Application Learn how to use Next.js features to build your application. ](/docs/app/building-your-application)[ ### API Reference Next.js API Reference for the App Router. ](/docs/app/api-reference) [Previous Project Structure ](/docs/getting-started/project-structure) [Next Building Your Application ](/docs/app/building-your-application) Was this helpful? supported. 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[generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [ redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Path Matching](#path-matching) * [Wildcard Path Matching](#wildcard-path-matching) * [Regex Path Matching](#regex-path-matching) * [Header, Cookie, and Query Matching](#header-cookie-and-query-matching) * [Redirects with basePath support](#redirects-with-basepath-support) * [Redirects with i18n support](#redirects-with-i18n-support) * [Other Redirects](#other-redirects) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/redirects.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)redirects redirects ========= Redirects allow you to redirect an incoming request path to a different destination path. To use redirects you can use the `redirects` key in `next.config.js`: next.config.js module.exports = { async redirects() { return [ { source: '/about', destination: '/', permanent: true, }, ] }, } `redirects` is an async function that expects an array to be returned holding objects with `source`, `destination`, and `permanent` properties: * `source` is the incoming request path pattern. * `destination` is the path you want to route to. * `permanent` `true` or `false` - if `true` will use the 308 status code which instructs clients/search engines to cache the redirect forever, if `false` will use the 307 status code which is temporary and is not cached. > **Why does Next.js use 307 and 308?** Traditionally a 302 was used for a temporary redirect, and a 301 for a permanent redirect, but many browsers changed the request method of the redirect to `GET`, regardless of the original method. For example, if the browser made a request to `POST /v1/users` which returned status code `302` with location `/v2/users`, the subsequent request might be `GET /v2/users` instead of the expected `POST /v2/users`. Next.js uses the 307 temporary redirect, and 308 permanent redirect status codes to explicitly preserve the request method used. * `basePath`: `false` or `undefined` - if false the `basePath` won't be included when matching, can be used for external redirects only. * `locale`: `false` or `undefined` - whether the locale should not be included when matching. * `has` is an array of [has objects](#header-cookie-and-query-matching) with the `type`, `key` and `value` properties. * `missing` is an array of [missing objects](#header-cookie-and-query-matching) with the `type`, `key` and `value` properties. Redirects are checked before the filesystem which includes pages and `/public` files. When using the Pages Router, redirects are not applied to client-side routing (`Link`, `router.push`) unless [Middleware](/docs/app/building-your-application/routing/middleware) is present and matches the path. When a redirect is applied, any query values provided in the request will be passed through to the redirect destination. For example, see the following redirect configuration: { source: '/old-blog/:path*', destination: '/blog/:path*', permanent: false } When `/old-blog/post-1?hello=world` is requested, the client will be redirected to `/blog/post-1?hello=world`. [Path Matching](#path-matching) ------------------------------- Path matches are allowed, for example `/old-blog/:slug` will match `/old-blog/hello-world` (no nested paths): next.config.js module.exports = { async redirects() { return [ { source: '/old-blog/:slug', destination: '/news/:slug', // Matched parameters can be used in the destination permanent: true, }, ] }, } ### [Wildcard Path Matching](#wildcard-path-matching) To match a wildcard path you can use `*` after a parameter, for example `/blog/:slug*` will match `/blog/a/b/c/d/hello-world`: next.config.js module.exports = { async redirects() { return [ { source: '/blog/:slug*', destination: '/news/:slug*', // Matched parameters can be used in the destination permanent: true, }, ] }, } ### [Regex Path Matching](#regex-path-matching) To match a regex path you can wrap the regex in parentheses after a parameter, for example `/post/:slug(\\d{1,})` will match `/post/123` but not `/post/abc`: next.config.js module.exports = { async redirects() { return [ { source: '/post/:slug(\\d{1,})', destination: '/news/:slug', // Matched parameters can be used in the destination permanent: false, }, ] }, } The following characters `(`, `)`, `{`, `}`, `:`, `*`, `+`, `?` are used for regex path matching, so when used in the `source` as non-special values they must be escaped by adding `\\` before them: next.config.js module.exports = { async redirects() { return [ { // this will match `/english(default)/something` being requested source: '/english\\(default\\)/:slug', destination: '/en-us/:slug', permanent: false, }, ] }, } [Header, Cookie, and Query Matching](#header-cookie-and-query-matching) ----------------------------------------------------------------------- To only match a redirect when header, cookie, or query values also match the `has` field or don't match the `missing` field can be used. Both the `source` and all `has` items must match and all `missing` items must not match for the redirect to be applied. `has` and `missing` items can have the following fields: * `type`: `String` - must be either `header`, `cookie`, `host`, or `query`. * `key`: `String` - the key from the selected type to match against. * `value`: `String` or `undefined` - the value to check for, if undefined any value will match. A regex like string can be used to capture a specific part of the value, e.g. if the value `first-(?<paramName>.*)` is used for `first-second` then `second` will be usable in the destination with `:paramName`. next.config.js module.exports = { async redirects() { return [ // if the header `x-redirect-me` is present, // this redirect will be applied { source: '/:path((?!another-page$).*)', has: [ { type: 'header', key: 'x-redirect-me', }, ], permanent: false, destination: '/another-page', }, // if the header `x-dont-redirect` is present, // this redirect will NOT be applied { source: '/:path((?!another-page$).*)', missing: [ { type: 'header', key: 'x-do-not-redirect', }, ], permanent: false, destination: '/another-page', }, // if the source, query, and cookie are matched, // this redirect will be applied { source: '/specific/:path*', has: [ { type: 'query', key: 'page', // the page value will not be available in the // destination since value is provided and doesn't // use a named capture group e.g. (?<page>home) value: 'home', }, { type: 'cookie', key: 'authorized', value: 'true', }, ], permanent: false, destination: '/another/:path*', }, // if the header `x-authorized` is present and // contains a matching value, this redirect will be applied { source: '/', has: [ { type: 'header', key: 'x-authorized', value: '(?<authorized>yes|true)', }, ], permanent: false, destination: '/home?authorized=:authorized', }, // if the host is `example.com`, // this redirect will be applied { source: '/:path((?!another-page$).*)', has: [ { type: 'host', value: 'example.com', }, ], permanent: false, destination: '/another-page', }, ] }, } ### [Redirects with basePath support](#redirects-with-basepath-support) When leveraging [`basePath` support](/docs/app/api-reference/next-config-js/basePath) with redirects each `source` and `destination` is automatically prefixed with the `basePath` unless you add `basePath: false` to the redirect: next.config.js module.exports = { basePath: '/docs', async redirects() { return [ { source: '/with-basePath', // automatically becomes /docs/with-basePath destination: '/another', // automatically becomes /docs/another permanent: false, }, { // does not add /docs since basePath: false is set source: '/without-basePath', destination: 'https://example.com', basePath: false, permanent: false, }, ] }, } ### [Redirects with i18n support](#redirects-with-i18n-support) When leveraging [`i18n` support](/docs/pages/building-your-application/routing/internationalization) with redirects each `source` and `destination` is automatically prefixed to handle the configured `locales` unless you add `locale: false` to the redirect. If `locale: false` is used you must prefix the `source` and `destination` with a locale for it to be matched correctly. next.config.js module.exports = { i18n: { locales: ['en', 'fr', 'de'], defaultLocale: 'en', }, async redirects() { return [ { source: '/with-locale', // automatically handles all locales destination: '/another', // automatically passes the locale on permanent: false, }, { // does not handle locales automatically since locale: false is set source: '/nl/with-locale-manual', destination: '/nl/another', locale: false, permanent: false, }, { // this matches '/' since `en` is the defaultLocale source: '/en', destination: '/en/another', locale: false, permanent: false, }, // it's possible to match all locales even when locale: false is set { source: '/:locale/page', destination: '/en/newpage', permanent: false, locale: false, }, { // this gets converted to /(en|fr|de)/(.*) so will not match the top-level // `/` or `/fr` routes like /:path* would source: '/(.*)', destination: '/another', permanent: false, }, ] }, } In some rare cases, you might need to assign a custom status code for older HTTP Clients to properly redirect. In these cases, you can use the `statusCode` property instead of the `permanent` property, but not both. To to ensure IE11 compatibility, a `Refresh` header is automatically added for the 308 status code. [Other Redirects](#other-redirects) ----------------------------------- * Inside [API Routes](/docs/pages/building-your-application/routing/api-routes) and [Route Handlers](/docs/app/building-your-application/routing/route-handlers), you can redirect based on the incoming request. * Inside [`getStaticProps`](/docs/pages/building-your-application/data-fetching/get-static-props) and [`getServerSideProps`](/docs/pages/building-your-application/data-fetching/get-server-side-props), you can redirect specific pages at request-time. [Version History](#version-history) ----------------------------------- Version Changes `v13.3.0` `missing` added. `v10.2.0` `has` added. `v9.5.0` `redirects` added. 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CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [ rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Rewrite parameters](#rewrite-parameters) * [Path Matching](#path-matching) * [Wildcard Path Matching](#wildcard-path-matching) * [Regex Path Matching](#regex-path-matching) * [Header, Cookie, and Query Matching](#header-cookie-and-query-matching) * [Rewriting to an external URL](#rewriting-to-an-external-url) * [Incremental adoption of Next.js](#incremental-adoption-of-nextjs) * [Rewrites with basePath support](#rewrites-with-basepath-support) * [Rewrites with i18n support](#rewrites-with-i18n-support) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/rewrites.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)rewrites rewrites ======== Rewrites allow you to map an incoming request path to a different destination path. Rewrites act as a URL proxy and mask the destination path, making it appear the user hasn't changed their location on the site. In contrast, [redirects](/docs/pages/api-reference/next-config-js/redirects) will reroute to a new page and show the URL changes. To use rewrites you can use the `rewrites` key in `next.config.js`: next.config.js module.exports = { async rewrites() { return [ { source: '/about', destination: '/', }, ] }, } Rewrites are applied to client-side routing, a `<Link href="/about">` will have the rewrite applied in the above example. `rewrites` is an async function that expects to return either an array or an object of arrays (see below) holding objects with `source` and `destination` properties: * `source`: `String` - is the incoming request path pattern. * `destination`: `String` is the path you want to route to. * `basePath`: `false` or `undefined` - if false the basePath won't be included when matching, can be used for external rewrites only. * `locale`: `false` or `undefined` - whether the locale should not be included when matching. * `has` is an array of [has objects](#header-cookie-and-query-matching) with the `type`, `key` and `value` properties. * `missing` is an array of [missing objects](#header-cookie-and-query-matching) with the `type`, `key` and `value` properties. When the `rewrites` function returns an array, rewrites are applied after checking the filesystem (pages and `/public` files) and before dynamic routes. When the `rewrites` function returns an object of arrays with a specific shape, this behavior can be changed and more finely controlled, as of `v10.1` of Next.js: next.config.js module.exports = { async rewrites() { return { beforeFiles: [ // These rewrites are checked after headers/redirects // and before all files including _next/public files which // allows overriding page files { source: '/some-page', destination: '/somewhere-else', has: [{ type: 'query', key: 'overrideMe' }], }, ], afterFiles: [ // These rewrites are checked after pages/public files // are checked but before dynamic routes { source: '/non-existent', destination: '/somewhere-else', }, ], fallback: [ // These rewrites are checked after both pages/public files // and dynamic routes are checked { source: '/:path*', destination: `https://my-old-site.com/:path*`, }, ], } }, } > **Good to know**: rewrites in `beforeFiles` do not check the filesystem/dynamic routes immediately after matching a source, they continue until all `beforeFiles` have been checked. The order Next.js routes are checked is: 1. [headers](/docs/pages/api-reference/next-config-js/headers) are checked/applied 2. [redirects](/docs/pages/api-reference/next-config-js/redirects) are checked/applied 3. `beforeFiles` rewrites are checked/applied 4. static files from the [public directory](/docs/pages/building-your-application/optimizing/static-assets), `_next/static` files, and non-dynamic pages are checked/served 5. `afterFiles` rewrites are checked/applied, if one of these rewrites is matched we check dynamic routes/static files after each match 6. `fallback` rewrites are checked/applied, these are applied before rendering the 404 page and after dynamic routes/all static assets have been checked. If you use [fallback: true/'blocking'](/docs/pages/api-reference/functions/get-static-paths#fallback-true) in `getStaticPaths`, the fallback `rewrites` defined in your `next.config.js` will _not_ be run. [Rewrite parameters](#rewrite-parameters) ----------------------------------------- When using parameters in a rewrite the parameters will be passed in the query by default when none of the parameters are used in the `destination`. next.config.js module.exports = { async rewrites() { return [ { source: '/old-about/:path*', destination: '/about', // The :path parameter isn't used here so will be automatically passed in the query }, ] }, } If a parameter is used in the destination none of the parameters will be automatically passed in the query. next.config.js module.exports = { async rewrites() { return [ { source: '/docs/:path*', destination: '/:path*', // The :path parameter is used here so will not be automatically passed in the query }, ] }, } You can still pass the parameters manually in the query if one is already used in the destination by specifying the query in the `destination`. next.config.js module.exports = { async rewrites() { return [ { source: '/:first/:second', destination: '/:first?second=:second', // Since the :first parameter is used in the destination the :second parameter // will not automatically be added in the query although we can manually add it // as shown above }, ] }, } > **Good to know**: Static pages from [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) or [prerendering](/docs/pages/building-your-application/data-fetching/get-static-props) params from rewrites will be parsed on the client after hydration and provided in the query. [Path Matching](#path-matching) ------------------------------- Path matches are allowed, for example `/blog/:slug` will match `/blog/hello-world` (no nested paths): next.config.js module.exports = { async rewrites() { return [ { source: '/blog/:slug', destination: '/news/:slug', // Matched parameters can be used in the destination }, ] }, } ### [Wildcard Path Matching](#wildcard-path-matching) To match a wildcard path you can use `*` after a parameter, for example `/blog/:slug*` will match `/blog/a/b/c/d/hello-world`: next.config.js module.exports = { async rewrites() { return [ { source: '/blog/:slug*', destination: '/news/:slug*', // Matched parameters can be used in the destination }, ] }, } ### [Regex Path Matching](#regex-path-matching) To match a regex path you can wrap the regex in parenthesis after a parameter, for example `/blog/:slug(\\d{1,})` will match `/blog/123` but not `/blog/abc`: next.config.js module.exports = { async rewrites() { return [ { source: '/old-blog/:post(\\d{1,})', destination: '/blog/:post', // Matched parameters can be used in the destination }, ] }, } The following characters `(`, `)`, `{`, `}`, `[`, `]`, `|`, `\`, `^`, `.`, `:`, `*`, `+`, `-`, `?`, `$` are used for regex path matching, so when used in the `source` as non-special values they must be escaped by adding `\\` before them: next.config.js module.exports = { async rewrites() { return [ { // this will match `/english(default)/something` being requested source: '/english\\(default\\)/:slug', destination: '/en-us/:slug', }, ] }, } [Header, Cookie, and Query Matching](#header-cookie-and-query-matching) ----------------------------------------------------------------------- To only match a rewrite when header, cookie, or query values also match the `has` field or don't match the `missing` field can be used. Both the `source` and all `has` items must match and all `missing` items must not match for the rewrite to be applied. `has` and `missing` items can have the following fields: * `type`: `String` - must be either `header`, `cookie`, `host`, or `query`. * `key`: `String` - the key from the selected type to match against. * `value`: `String` or `undefined` - the value to check for, if undefined any value will match. A regex like string can be used to capture a specific part of the value, e.g. if the value `first-(?<paramName>.*)` is used for `first-second` then `second` will be usable in the destination with `:paramName`. next.config.js module.exports = { async rewrites() { return [ // if the header `x-rewrite-me` is present, // this rewrite will be applied { source: '/:path*', has: [ { type: 'header', key: 'x-rewrite-me', }, ], destination: '/another-page', }, // if the header `x-rewrite-me` is not present, // this rewrite will be applied { source: '/:path*', missing: [ { type: 'header', key: 'x-rewrite-me', }, ], destination: '/another-page', }, // if the source, query, and cookie are matched, // this rewrite will be applied { source: '/specific/:path*', has: [ { type: 'query', key: 'page', // the page value will not be available in the // destination since value is provided and doesn't // use a named capture group e.g. (?<page>home) value: 'home', }, { type: 'cookie', key: 'authorized', value: 'true', }, ], destination: '/:path*/home', }, // if the header `x-authorized` is present and // contains a matching value, this rewrite will be applied { source: '/:path*', has: [ { type: 'header', key: 'x-authorized', value: '(?<authorized>yes|true)', }, ], destination: '/home?authorized=:authorized', }, // if the host is `example.com`, // this rewrite will be applied { source: '/:path*', has: [ { type: 'host', value: 'example.com', }, ], destination: '/another-page', }, ] }, } [Rewriting to an external URL](#rewriting-to-an-external-url) ------------------------------------------------------------- Examples * [Incremental adoption of Next.js](https://github.com/vercel/next.js/tree/canary/examples/custom-routes-proxying) * [Using Multiple Zones](https://github.com/vercel/next.js/tree/canary/examples/with-zones) Rewrites allow you to rewrite to an external url. This is especially useful for incrementally adopting Next.js. The following is an example rewrite for redirecting the `/blog` route of your main app to an external site. next.config.js module.exports = { async rewrites() { return [ { source: '/blog', destination: 'https://example.com/blog', }, { source: '/blog/:slug', destination: 'https://example.com/blog/:slug', // Matched parameters can be used in the destination }, ] }, } If you're using `trailingSlash: true`, you also need to insert a trailing slash in the `source` parameter. If the destination server is also expecting a trailing slash it should be included in the `destination` parameter as well. next.config.js module.exports = { trailingSlash: true, async rewrites() { return [ { source: '/blog/', destination: 'https://example.com/blog/', }, { source: '/blog/:path*/', destination: 'https://example.com/blog/:path*/', }, ] }, } ### [Incremental adoption of Next.js](#incremental-adoption-of-nextjs) You can also have Next.js fall back to proxying to an existing website after checking all Next.js routes. This way you don't have to change the rewrites configuration when migrating more pages to Next.js next.config.js module.exports = { async rewrites() { return { fallback: [ { source: '/:path*', destination: `https://custom-routes-proxying-endpoint.vercel.app/:path*`, }, ], } }, } ### [Rewrites with basePath support](#rewrites-with-basepath-support) When leveraging [`basePath` support](/docs/app/api-reference/next-config-js/basePath) with rewrites each `source` and `destination` is automatically prefixed with the `basePath` unless you add `basePath: false` to the rewrite: next.config.js module.exports = { basePath: '/docs', async rewrites() { return [ { source: '/with-basePath', // automatically becomes /docs/with-basePath destination: '/another', // automatically becomes /docs/another }, { // does not add /docs to /without-basePath since basePath: false is set // Note: this can not be used for internal rewrites e.g. `destination: '/another'` source: '/without-basePath', destination: 'https://example.com', basePath: false, }, ] }, } ### [Rewrites with i18n support](#rewrites-with-i18n-support) When leveraging [`i18n` support](/docs/pages/building-your-application/routing/internationalization) with rewrites each `source` and `destination` is automatically prefixed to handle the configured `locales` unless you add `locale: false` to the rewrite. If `locale: false` is used you must prefix the `source` and `destination` with a locale for it to be matched correctly. next.config.js module.exports = { i18n: { locales: ['en', 'fr', 'de'], defaultLocale: 'en', }, async rewrites() { return [ { source: '/with-locale', // automatically handles all locales destination: '/another', // automatically passes the locale on }, { // does not handle locales automatically since locale: false is set source: '/nl/with-locale-manual', destination: '/nl/another', locale: false, }, { // this matches '/' since `en` is the defaultLocale source: '/en', destination: '/en/another', locale: false, }, { // it's possible to match all locales even when locale: false is set source: '/:locale/api-alias/:path*', destination: '/api/:path*', locale: false, }, { // this gets converted to /(en|fr|de)/(.*) so will not match the top-level // `/` or `/fr` routes like /:path* would source: '/(.*)', destination: '/another', }, ] }, } [Version History](#version-history) ----------------------------------- Version Changes `v13.3.0` `missing` added. `v10.2.0` `has` added. `v9.5.0` Headers added. 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/trailingSlash.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)trailingSlash trailingSlash ============= By default Next.js will redirect urls with trailing slashes to their counterpart without a trailing slash. For example `/about/` will redirect to `/about`. You can configure this behavior to act the opposite way, where urls without trailing slashes are redirected to their counterparts with trailing slashes. Open `next.config.js` and add the `trailingSlash` config: next.config.js module.exports = { trailingSlash: true, } With this option set, urls like `/about` will redirect to `/about/`. When used with [`output: "export"`](/docs/app/building-your-application/deploying/static-exports) configuration, the `/about` page will output `/about/index.html` (instead of the default `/about.html`). [Version History](#version-history) ----------------------------------- Version Changes `v9.5.0` `trailingSlash` added. [Previous Runtime Config ](/docs/pages/api-reference/next-config-js/runtime-configuration) [Next transpilePackages ](/docs/pages/api-reference/next-config-js/transpilePackages) Was this helpful? supported. Send

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[Watch the Keynote](https://vercel.com/ship?utm_source=next_site&utm_medium=web&utm_campaign=vercel_ship&utm_content=next_site_showcase) The web framework for when it mattersself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rij6unhn6uf:",1) ======================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================= Peerless performance, efficiency and developer experience. Next.js is trusted by some of the biggest names of the web.self.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":R1qj6unhn6uf:",1)Peerless performance, efficiency and developer experienceself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":R2qj6unhn6uf:",1) [Learn About Managed Next.js](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=showcase_redesign&utm_campaign=hero_cta)[Contact Sales](https://vercel.com/contact/sales/nextjs?utm_source=next_site&utm_medium=showcase_redesign&utm_campaign=hero_cta) *   [Read the Washington Post's customer story](https://vercel.com/customers/washington-post-next.js-vercel-engineering-at-the-speed-of-breaking-news?utm_source=next-site&utm_medium=showcase-wapost-card&utm_campaign=showcase-new)  Engineering a site at the speed of breaking newsself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rl8b36unhn6uf:",1)The Washington Post had 5 billion+ AWS Lambda invocations per week, and saw lightning-fast turnaround on developing new features. 5 Billion+ Lambda invocations per week Lighting-Fast Turnaround on developing new features [Read the customer story](https://vercel.com/customers/washington-post-next.js-vercel-engineering-at-the-speed-of-breaking-news?utm_source=next-site&utm_medium=showcase-wapost-card&utm_campaign=showcase-new) 5 Billion+ Lambda invocations per week Lighting-Fast Turnaround on developing new features *   [View the AI Chatbot Template template](https://vercel.com/templates/next.js/nextjs-ai-chatbot?utm_source=next-site&utm_medium=showcase-ai-chatbot-card&utm_campaign=showcase-new) AI Chatbot Template A full-featured, hackable Next.js AI chatbot built by Vercelself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rl8j36unhn6uf:",1) [Deploy this template](https://vercel.com/templates/next.js/nextjs-ai-chatbot?utm_source=next-site&utm_medium=showcase-ai-chatbot-card&utm_campaign=showcase-new) *   [Read Stripe's customer story](https://vercel.com/blog/architecting-reliability-stripes-black-friday-site?utm_source=next-site&utm_medium=showcase-stripe-card&utm_campaign=showcase-new)  Architecting a live look at reliability: Stripe's viral Black Friday siteself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rl8r36unhn6uf:",1)With Vercel, Stripe's Black Friday site saw 100% uptime with over 17 million edge requests at launch 100% Uptime 17m+ Edge requests at launch [Read the customer story](https://vercel.com/blog/architecting-reliability-stripes-black-friday-site?utm_source=next-site&utm_medium=showcase-stripe-card&utm_campaign=showcase-new) 100% Uptime 17m+ Edge requests at launch *   [Read Sonos's customer story](https://vercel.com/blog/how-sonos-amplified-their-devex?utm_source=next-site&utm_medium=showcase-sonos-card&utm_campaign=showcase-new)  Developing at the speed of sound: How Sonos amplified their DevExself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rl9336unhn6uf:",1)After migrating to Next.js and Vercel, Sonos had 75% faster build times and improved their performance scores by 10% 75% faster Build times 10% better Performance scores [Read the customer story](https://vercel.com/blog/how-sonos-amplified-their-devex?utm_source=next-site&utm_medium=showcase-sonos-card&utm_campaign=showcase-new) 75% faster Build times 10% better Performance scores *   [View the Commerce Template template](https://vercel.com/templates/next.js/nextjs-commerce?utm_source=next-site&utm_medium=showcase-commerce-template-card&utm_campaign=showcase-new) Commerce Template Starter kit for high-performance commerce with Shopifyself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rl9b36unhn6uf:",1) [Deploy this template](https://vercel.com/templates/next.js/nextjs-commerce?utm_source=next-site&utm_medium=showcase-commerce-template-card&utm_campaign=showcase-new) 14th   Largest on GitHub \# 1 React Framework 110,000 Stars on GitHub Meet thousands of beautiful websites built with Next.js by Vercelself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rn6unhn6uf:",1) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- All Composable Commerce Web Apps AI Marketing & Media Platform Engineering [  Sonos Composable Commerce ](https://vercel.com/blog/how-sonos-amplified-their-devex?utm_source=next-site&utm_medium=sonos_callout&utm_campaign=showcase-new)[  Nike Composable Commerce ](https://www.nike.com)[  OpenAI ChatGPT AI ](https://chatgpt.com/)[  Claude AI ](https://claude.ai/)[  Spotify Web Apps ](https://open.spotify.com)[  NerdWallet Web Apps ](https://www.nerdwallet.com/) Load More Powering the best frontend teams        StarterEcommerceBlogAIEdge FunctionsEdge ConfigPortfolioSaaSMulti-tenant AppsRealtime AppsDocumentationVirtual EventWeb3 Build like the Best ------------------- Jumpstart your Next.js development with pre-built solutions from Vercel and our community.self.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":R9j96unhn6uf:",1) [Deploy a Template on Vercel](https://vercel.com/templates/next.js?utm_source=next-site&utm_medium=deploy-template-on-vercel-cta&utm_campaign=showcase-new)  Next.js Boilerplate A Next.js app and a Serverless Function API.  Image Gallery Starter An image gallery built on Next.js and Cloudinary.  Next.js Commerce An all-in-one starter kit for high-performance ecommerce sites. A powerful framework for building high-performance, server rendered web applicationsself.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":Rr6unhn6uf:",0.23) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ### Superior Developer Experience Deploy your Next.js site globally in seconds, with zero configuration just Git push to get started.self.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":R2jb6unhn6uf:",1) ### Battle-tested in Production All the features you need for production: hybrid static & server rendering, TypeScript support, smart bundling, route pre-fetching, and more.self.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":R2lb6unhn6uf:",1) ### Performance-obsessed stack Next.js brings years of experience in building and optimizing production applications.self.\_\_wrap\_n=self.\_\_wrap\_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.\_\_wrap\_b=(e,t,s)=>{let r=(s=s||document.querySelector(\`\[data-br="${e}"\]\`)).parentElement,n=e=>s.style.maxWidth=e+"px";s.style.maxWidth="";let a=r.clientWidth,i=r.clientHeight,c=a/2-.25,l=a+.5,o;if(a){for(n(c),c=Math.max(s.scrollWidth,c);c+1<l;)n(o=Math.round((c+l)/2)),r.clientHeight===i?l=o:c=o;n(l\*t+a\*(1-t))}s.\_\_wrap\_o||"undefined"!=typeof ResizeObserver&&(s.\_\_wrap\_o=new ResizeObserver(()=>{self.\_\_wrap\_b(0,+s.dataset.brr,s)})).observe(r)};self.\_\_wrap\_n!=1&&self.\_\_wrap\_b(":R2nb6unhn6uf:",1) [Learn About Managed Next.js](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=showcase_redesign&utm_campaign=footer_learn_cta)[Contact Sales](https://vercel.com/contact/sales/nextjs?utm_source=next_site&utm_medium=showcase_redesign&utm_campaign=footer_learn_cta)

https://nextjs.org/governance

Governance ========== Next.js was created by the team at [Vercel](https://vercel.com?utm_source=next-site&utm_medium=governance) in 2016. The research and development of Next.js is led by the core team working full-time at Vercel. With over 3,000 contributors from around the world, Next.js is a collaborative open-source effort to build tools for React and Web developers. [Teams](#teams) --------------- * **Lead:** [Tim Neutkens](https://twitter.com/timneutkens), Next.js Lead and Co-Creator * **Core Team:** Next.js team at [Vercel](https://vercel.com?utm_source=next-site&utm_medium=governance) manages the direction of Next.js and leadership of the project, as well as [SWC](https://swc.rs/), [Webpack](https://webpack.js.org/), and [Turbopack](https://turbo.build/pack) * **Documentation:** DevRel teams at [Vercel](https://vercel.com?utm_source=next-site&utm_medium=governance) manage documentation and learning platforms * **Collaborators:** [React team at Meta](https://react.dev/community/team) and the [Aurora team at Google](https://developer.chrome.com/blog/introducing-aurora/) [Roadmap and RFC Process](#roadmap-and-rfc-process) --------------------------------------------------- Large architecture decisions and features start as a [Request for Comments (RFC)](https://github.com/vercel/next.js/discussions/categories/rfc) inside GitHub Discussions. The entire Next.js community is invited be to involved in the process and discuss the tradeoffs of proposed work. This process is essential to ensure features are built together with the community and our collaborators. More minor changes including bug fixes and documentation improvements are still implemented through GitHub pull requests. However, for larger initiatives, we believe it's essential to follow the RFC process. [Stability and Release Phases](#stability-and-release-phases) ------------------------------------------------------------- Next.js follows [Semantic Versioning](https://semver.org/) and releases new versions on a regular basis. * **Experimental:** Experimental features lack essential capabilities required to be ready for stability. The feature is considered to be under active development and is being built to transition into Beta. * **Beta:** Beta means the feature does not yet meet our quality standards for a stable release. There is also usually a need for more information or feedback from Next.js developers to validate this feature works as expected in a variety of environments. * **Stable:** When the features reach stability, it is considered ready for use in production. APIs marked as stable will only change in a backward-compatible way unless there is a [major release](https://semver.org/). * **Deprecated:** A feature is in the process of being removed. Deprecated features include documentation for existing users with the next steps and information on when to expect the feature to be removed. [Next.js Support](#nextjs-support) ---------------------------------- For individual developers looking for free support on their Next.js application, they can ask questions in [GitHub Discussions](https://github.com/vercel/next.js/discussions) or in the [Next.js Discord](https://nextjs.org/discord). For companies looking for paid support on their Next.js application, they can [contact](https://vercel.com/contact/sales?utm_source=next-site&utm_medium=governance) the Next.js team at Vercel for more information. [Additional Resources](#additional-resources) --------------------------------------------- * [Logo Policy and Brand Guidelines](https://vercel.com/design/brands#next-js) * [Reporting Security Issues](https://github.com/vercel/next.js/security/policy) * [Code of Conduct](https://github.com/vercel/next.js/blob/canary/CODE_OF_CONDUCT.md) * [Contributing Guidelines](https://github.com/vercel/next.js/blob/canary/contributing.md)

https://nextjs.org/docs/pages/api-reference/next-config-js/transpilePackages

Menu Using Pages Router Features available in /pages * [Getting Started](/docs/getting-started) * [Installation](/docs/getting-started/installation) * [Project Structure](/docs/getting-started/project-structure) * [Building Your Application](/docs/app/building-your-application) * [Routing](/docs/app/building-your-application/routing) * [Defining Routes](/docs/app/building-your-application/routing/defining-routes) * [Pages and Layouts](/docs/app/building-your-application/routing/pages-and-layouts) * [Linking and Navigating](/docs/app/building-your-application/routing/linking-and-navigating) * [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [Error Handling](/docs/app/building-your-application/routing/error-handling) * [Redirecting](/docs/app/building-your-application/routing/redirecting) * [Route Groups](/docs/app/building-your-application/routing/route-groups) * [Project Organization](/docs/app/building-your-application/routing/colocation) * [Dynamic Routes](/docs/app/building-your-application/routing/dynamic-routes) * [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) * [Intercepting Routes](/docs/app/building-your-application/routing/intercepting-routes) * [Route Handlers](/docs/app/building-your-application/routing/route-handlers) * [Middleware](/docs/app/building-your-application/routing/middleware) * [Internationalization](/docs/app/building-your-application/routing/internationalization) * [Data Fetching](/docs/app/building-your-application/data-fetching) * [Fetching, Caching, and Revalidating](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) * [Server Actions and Mutations](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) * [Data Fetching Patterns and Best Practices](/docs/app/building-your-application/data-fetching/patterns) * [Rendering](/docs/app/building-your-application/rendering) * [Server Components](/docs/app/building-your-application/rendering/server-components) * [Client Components](/docs/app/building-your-application/rendering/client-components) * [Composition Patterns](/docs/app/building-your-application/rendering/composition-patterns) * [Edge and Node.js Runtimes](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) * [Caching](/docs/app/building-your-application/caching) * [Styling](/docs/app/building-your-application/styling) * [CSS Modules](/docs/app/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/app/building-your-application/styling/css-in-js) * [Sass](/docs/app/building-your-application/styling/sass) * [Optimizing](/docs/app/building-your-application/optimizing) * [Images](/docs/app/building-your-application/optimizing/images) * [Videos](/docs/app/building-your-application/optimizing/videos) * [Fonts](/docs/app/building-your-application/optimizing/fonts) * [Metadata](/docs/app/building-your-application/optimizing/metadata) * [Scripts](/docs/app/building-your-application/optimizing/scripts) * [Bundle Analyzer](/docs/app/building-your-application/optimizing/bundle-analyzer) * [Lazy Loading](/docs/app/building-your-application/optimizing/lazy-loading) * [Analytics](/docs/app/building-your-application/optimizing/analytics) * [Instrumentation](/docs/app/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/app/building-your-application/optimizing/open-telemetry) * [Static Assets](/docs/app/building-your-application/optimizing/static-assets) * [Third Party Libraries](/docs/app/building-your-application/optimizing/third-party-libraries) * [Memory Usage](/docs/app/building-your-application/optimizing/memory-usage) * [Configuring](/docs/app/building-your-application/configuring) * [TypeScript](/docs/app/building-your-application/configuring/typescript) * [ESLint](/docs/app/building-your-application/configuring/eslint) * [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases) * [MDX](/docs/app/building-your-application/configuring/mdx) * [src Directory](/docs/app/building-your-application/configuring/src-directory) * [Draft Mode](/docs/app/building-your-application/configuring/draft-mode) * [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) * [Testing](/docs/app/building-your-application/testing) * [Vitest](/docs/app/building-your-application/testing/vitest) * [Jest](/docs/app/building-your-application/testing/jest) * [Playwright](/docs/app/building-your-application/testing/playwright) * [Cypress](/docs/app/building-your-application/testing/cypress) * [Authentication](/docs/app/building-your-application/authentication) * [Deploying](/docs/app/building-your-application/deploying) * [Production Checklist](/docs/app/building-your-application/deploying/production-checklist) * [Static Exports](/docs/app/building-your-application/deploying/static-exports) * [Upgrading](/docs/app/building-your-application/upgrading) * [Codemods](/docs/app/building-your-application/upgrading/codemods) * [App Router Migration](/docs/app/building-your-application/upgrading/app-router-migration) * [Version 14](/docs/app/building-your-application/upgrading/version-14) * [Migrating from Vite](/docs/app/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/app/building-your-application/upgrading/from-create-react-app) * [API Reference](/docs/app/api-reference) * [Components](/docs/app/api-reference/components) * [Font](/docs/app/api-reference/components/font) * [<Image>](/docs/app/api-reference/components/image) * [<Link>](/docs/app/api-reference/components/link) * [<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, icon, and apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [webpack loaders](#webpack-loaders) * [Supported loaders](#supported-loaders) * [Resolve aliases](#resolve-aliases) * [Resolve extensions](#resolve-extensions) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/turbo.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)turbo turbo (experimental) ==================== Turbopack can be customized to transform different files and change how modules are resolved. > **Good to know**: > > * These features are experimental and will only work with `next --turbo`. > * Turbopack for Next.js does not require loaders nor loader configuration for built-in functionality. Turbopack has built-in support for css and compiling modern JavaScript, so there's no need for `css-loader`, `postcss-loader`, or `babel-loader` if you're using `@babel/preset-env`. [webpack loaders](#webpack-loaders) ----------------------------------- If you need loader support beyond what's built in, many webpack loaders already work with Turbopack. There are currently some limitations: * Only a core subset of the webpack loader API is implemented. Currently, there is enough coverage for some popular loaders, and we'll expand our API support in the future. * Only loaders that return JavaScript code are supported. Loaders that transform files like stylesheets or images are not currently supported. * Options passed to webpack loaders must be plain JavaScript primitives, objects, and arrays. For example, it's not possible to pass `require()`d plugin modules as option values. To configure loaders, add the names of the loaders you've installed and any options in `next.config.js`, mapping file extensions to a list of loaders: next.config.js module.exports = { experimental: { turbo: { rules: { '*.svg': { loaders: ['@svgr/webpack'], as: '*.js', }, }, }, }, } > **Good to know**: Prior to Next.js version 13.4.4, `experimental.turbo.rules` was named `experimental.turbo.loaders` and only accepted file extensions like `.mdx` instead of `*.mdx`. ### [Supported loaders](#supported-loaders) The following loaders have been tested to work with Turbopack's webpack loader implementation: * [`babel-loader`](https://www.npmjs.com/package/babel-loader) * [`@svgr/webpack`](https://www.npmjs.com/package/@svgr/webpack) * [`svg-inline-loader`](https://www.npmjs.com/package/svg-inline-loader) * [`yaml-loader`](https://www.npmjs.com/package/yaml-loader) * [`string-replace-loader`](https://www.npmjs.com/package/string-replace-loader) * [`raw-loader`](https://www.npmjs.com/package/raw-loader) * ['sass-loader'](https://www.npmjs.com/package/sass-loader) [Resolve aliases](#resolve-aliases) ----------------------------------- Through `next.config.js`, Turbopack can be configured to modify module resolution through aliases, similar to webpack's [`resolve.alias`](https://webpack.js.org/configuration/resolve/#resolvealias) configuration. To configure resolve aliases, map imported patterns to their new destination in `next.config.js`: next.config.js module.exports = { experimental: { turbo: { resolveAlias: { underscore: 'lodash', mocha: { browser: 'mocha/browser-entry.js' }, }, }, }, } This aliases imports of the `underscore` package to the `lodash` package. In other words, `import underscore from 'underscore'` will load the `lodash` module instead of `underscore`. Turbopack also supports conditional aliasing through this field, similar to Node.js's [conditional exports](https://nodejs.org/docs/latest-v18.x/api/packages.html#conditional-exports). At the moment only the `browser` condition is supported. In the case above, imports of the `mocha` module will be aliased to `mocha/browser-entry.js` when Turbopack targets browser environments. [Resolve extensions](#resolve-extensions) ----------------------------------------- Through `next.config.js`, Turbopack can be configured to resolve modules with custom extensions, similar to webpack's [`resolve.extensions`](https://webpack.js.org/configuration/resolve/#resolveextensions) configuration. To configure resolve extensions, use the `resolveExtensions` field in `next.config.js`: next.config.js module.exports = { experimental: { turbo: { resolveExtensions: [ '.mdx', '.tsx', '.ts', '.jsx', '.js', '.mjs', '.json', ], }, }, } This overwrites the original resolve extensions with the provided list. Make sure to include the default extensions. For more information and guidance for how to migrate your app to Turbopack from webpack, see [Turbopack's documentation on webpack compatibility](https://turbo.build/pack/docs/migrating-from-webpack). 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/03-pages/02-api-reference/03-next-config-js/runtime-configuration.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Pages Router](/docs/pages)[...](/docs/pages/api-reference)[next.config.js Options](/docs/pages/api-reference/next-config-js)Runtime Config Runtime Config ============== > **Warning:** > > * **This feature is deprecated.** We recommend using [environment variables](/docs/pages/building-your-application/configuring/environment-variables) instead, which also can support reading runtime values. > * You can run code on server startup using the [`register` function](/docs/app/building-your-application/optimizing/instrumentation). > * This feature does not work with [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization), [Output File Tracing](/docs/pages/api-reference/next-config-js/output#automatically-copying-traced-files), or [React Server Components](/docs/app/building-your-application/rendering/server-components). To add runtime configuration to your app, open `next.config.js` and add the `publicRuntimeConfig` and `serverRuntimeConfig` configs: next.config.js module.exports = { serverRuntimeConfig: { // Will only be available on the server side mySecret: 'secret', secondSecret: process.env.SECOND_SECRET, // Pass through env variables }, publicRuntimeConfig: { // Will be available on both server and client staticFolder: '/static', }, } Place any server-only runtime config under `serverRuntimeConfig`. Anything accessible to both client and server-side code should be under `publicRuntimeConfig`. > A page that relies on `publicRuntimeConfig` **must** use `getInitialProps` or `getServerSideProps` or your application must have a [Custom App](/docs/pages/building-your-application/routing/custom-app) with `getInitialProps` to opt-out of [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization). Runtime configuration won't be available to any page (or component in a page) without being server-side rendered. To get access to the runtime configs in your app use `next/config`, like so: import getConfig from 'next/config' import Image from 'next/image' // Only holds serverRuntimeConfig and publicRuntimeConfig const { serverRuntimeConfig, publicRuntimeConfig } = getConfig() // Will only be available on the server-side console.log(serverRuntimeConfig.mySecret) // Will be available on both server-side and client-side console.log(publicRuntimeConfig.staticFolder) function MyImage() { return ( <div> <Image src={`${publicRuntimeConfig.staticFolder}/logo.png`} alt="logo" layout="fill" /> </div> ) } export default MyImage [Previous rewrites ](/docs/pages/api-reference/next-config-js/rewrites) [Next trailingSlash ](/docs/pages/api-reference/next-config-js/trailingSlash) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Sitemap files (.xml)](#sitemap-files-xml) * [Generating a sitemap using code (.js, .ts)](#generating-a-sitemap-using-code-js-ts) * [Generate a localized Sitemap](#generate-a-localized-sitemap) * [Generating multiple sitemaps](#generating-multiple-sitemaps) * [Returns](#returns) * [Version History](#version-history) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/02-file-conventions/01-metadata/sitemap.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference/file-conventions)[Metadata Files](/docs/app/api-reference/file-conventions/metadata)sitemap.xml sitemap.xml =========== `sitemap.(xml|js|ts)` is a special file that matches the [Sitemaps XML format](https://www.sitemaps.org/protocol.html) to help search engine crawlers index your site more efficiently. ### [Sitemap files (.xml)](#sitemap-files-xml) For smaller applications, you can create a `sitemap.xml` file and place it in the root of your `app` directory. app/sitemap.xml <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"> <url> <loc>https://acme.com</loc> <lastmod>2023-04-06T15:02:24.021Z</lastmod> <changefreq>yearly</changefreq> <priority>1</priority> </url> <url> <loc>https://acme.com/about</loc> <lastmod>2023-04-06T15:02:24.021Z</lastmod> <changefreq>monthly</changefreq> <priority>0.8</priority> </url> <url> <loc>https://acme.com/blog</loc> <lastmod>2023-04-06T15:02:24.021Z</lastmod> <changefreq>weekly</changefreq> <priority>0.5</priority> </url> </urlset> ### [Generating a sitemap using code (.js, .ts)](#generating-a-sitemap-using-code-js-ts) You can use the `sitemap.(js|ts)` file convention to programmatically **generate** a sitemap by exporting a default function that returns an array of URLs. If using TypeScript, a [`Sitemap`](#returns) type is available. app/sitemap.ts TypeScript JavaScriptTypeScript import { MetadataRoute } from 'next' export default function sitemap(): MetadataRoute.Sitemap { return [ { url: 'https://acme.com', lastModified: new Date(), changeFrequency: 'yearly', priority: 1, }, { url: 'https://acme.com/about', lastModified: new Date(), changeFrequency: 'monthly', priority: 0.8, }, { url: 'https://acme.com/blog', lastModified: new Date(), changeFrequency: 'weekly', priority: 0.5, }, ] } Output: acme.com/sitemap.xml <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"> <url> <loc>https://acme.com</loc> <lastmod>2023-04-06T15:02:24.021Z</lastmod> <changefreq>yearly</changefreq> <priority>1</priority> </url> <url> <loc>https://acme.com/about</loc> <lastmod>2023-04-06T15:02:24.021Z</lastmod> <changefreq>monthly</changefreq> <priority>0.8</priority> </url> <url> <loc>https://acme.com/blog</loc> <lastmod>2023-04-06T15:02:24.021Z</lastmod> <changefreq>weekly</changefreq> <priority>0.5</priority> </url> </urlset> ### [Generate a localized Sitemap](#generate-a-localized-sitemap) app/sitemap.ts TypeScript JavaScriptTypeScript import { MetadataRoute } from 'next' export default function sitemap(): MetadataRoute.Sitemap { return [ { url: 'https://acme.com', lastModified: new Date(), alternates: { languages: { es: 'https://acme.com/es', de: 'https://acme.com/de', }, }, }, { url: 'https://acme.com/about', lastModified: new Date(), alternates: { languages: { es: 'https://acme.com/es/about', de: 'https://acme.com/de/about', }, }, }, { url: 'https://acme.com/blog', lastModified: new Date(), alternates: { languages: { es: 'https://acme.com/es/blog', de: 'https://acme.com/de/blog', }, }, }, ] } Output: acme.com/sitemap.xml <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml"> <url> <loc>https://acme.com</loc> <xhtml:link rel="alternate" hreflang="es" href="https://acme.com/es"/> <xhtml:link rel="alternate" hreflang="de" href="https://acme.com/de"/> <lastmod>2023-04-06T15:02:24.021Z</lastmod> </url> <url> <loc>https://acme.com/about</loc> <xhtml:link rel="alternate" hreflang="es" href="https://acme.com/es/about"/> <xhtml:link rel="alternate" hreflang="de" href="https://acme.com/de/about"/> <lastmod>2023-04-06T15:02:24.021Z</lastmod> </url> <url> <loc>https://acme.com/blog</loc> <xhtml:link rel="alternate" hreflang="es" href="https://acme.com/es/blog"/> <xhtml:link rel="alternate" hreflang="de" href="https://acme.com/de/blog"/> <lastmod>2023-04-06T15:02:24.021Z</lastmod> </url> </urlset> ### [Generating multiple sitemaps](#generating-multiple-sitemaps) While a single sitemap will work for most applications. For large web applications, you may need to split a sitemap into multiple files. There are two ways you can create multiple sitemaps: * By nesting `sitemap.(xml|js|ts)` inside multiple route segments e.g. `app/sitemap.xml` and `app/products/sitemap.xml`. * By using the [`generateSitemaps`](/docs/app/api-reference/functions/generate-sitemaps) function. For example, to split a sitemap using `generateSitemaps`, return an array of objects with the sitemap `id`. Then, use the `id` to generate the unique sitemaps. app/product/sitemap.ts TypeScript JavaScriptTypeScript import { BASE_URL } from '@/app/lib/constants' export async function generateSitemaps() { // Fetch the total number of products and calculate the number of sitemaps needed return [{ id: 0 }, { id: 1 }, { id: 2 }, { id: 3 }] } export default async function sitemap({ id, }: { id: number }): Promise<MetadataRoute.Sitemap> { // Google's limit is 50,000 URLs per sitemap const start = id * 50000 const end = start + 50000 const products = await getProducts( `SELECT id, date FROM products WHERE id BETWEEN ${start} AND ${end}` ) return products.map((product) => ({ url: `${BASE_URL}/product/${id}`, lastModified: product.date, })) } In production, your generated sitemaps will be available at `/.../sitemap/[id].xml`. For example, `/product/sitemap/1.xml`. In development, you can view the generated sitemap on `/.../sitemap.xml/[id]`. For example, `/product/sitemap.xml/1`. This difference is temporary and will follow the production format. See the [`generateSitemaps` API reference](/docs/app/api-reference/functions/generate-sitemaps) for more information. [Returns](#returns) ------------------- The default function exported from `sitemap.(xml|ts|js)` should return an array of objects with the following properties: type Sitemap = Array<{ url: string lastModified?: string | Date changeFrequency?: | 'always' | 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly' | 'never' priority?: number alternates?: { languages?: Languages<string> } }> [Version History](#version-history) ----------------------------------- Version Changes `v13.4.5` Add `changeFrequency` and `priority` attributes to sitemaps. `v13.3.0` `sitemap` introduced. Next Steps ---------- Learn how to use the generateSitemaps function. [ App Router ... Functions ### generateSitemaps Learn how to use the generateSiteMaps function to create multiple sitemaps for your application. ](/docs/app/api-reference/functions/generate-sitemaps) [Previous robots.txt ](/docs/app/api-reference/file-conventions/metadata/robots) [Next Functions ](/docs/app/api-reference/functions) Was this helpful? supported. Send

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[Fonts](/docs/app/building-your-application/optimizing/fonts) * [Metadata](/docs/app/building-your-application/optimizing/metadata) * [Scripts](/docs/app/building-your-application/optimizing/scripts) * [Bundle Analyzer](/docs/app/building-your-application/optimizing/bundle-analyzer) * [Lazy Loading](/docs/app/building-your-application/optimizing/lazy-loading) * [Analytics](/docs/app/building-your-application/optimizing/analytics) * [Instrumentation](/docs/app/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/app/building-your-application/optimizing/open-telemetry) * [Static Assets](/docs/app/building-your-application/optimizing/static-assets) * [Third Party Libraries](/docs/app/building-your-application/optimizing/third-party-libraries) * [Memory Usage](/docs/app/building-your-application/optimizing/memory-usage) * [Configuring](/docs/app/building-your-application/configuring) * [TypeScript](/docs/app/building-your-application/configuring/typescript) * [ESLint](/docs/app/building-your-application/configuring/eslint) * [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases) * [MDX](/docs/app/building-your-application/configuring/mdx) * [src Directory](/docs/app/building-your-application/configuring/src-directory) * [Draft Mode](/docs/app/building-your-application/configuring/draft-mode) * [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) * [Testing](/docs/app/building-your-application/testing) * [Vitest](/docs/app/building-your-application/testing/vitest) * [Jest](/docs/app/building-your-application/testing/jest) * [Playwright](/docs/app/building-your-application/testing/playwright) * [Cypress](/docs/app/building-your-application/testing/cypress) * [Authentication](/docs/app/building-your-application/authentication) * [Deploying](/docs/app/building-your-application/deploying) * [Production Checklist](/docs/app/building-your-application/deploying/production-checklist) * [Static Exports](/docs/app/building-your-application/deploying/static-exports) * [Upgrading](/docs/app/building-your-application/upgrading) * [Codemods](/docs/app/building-your-application/upgrading/codemods) * [App Router Migration](/docs/app/building-your-application/upgrading/app-router-migration) * [Version 14](/docs/app/building-your-application/upgrading/version-14) * [Migrating from Vite](/docs/app/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/app/building-your-application/upgrading/from-create-react-app) * [API Reference](/docs/app/api-reference) * [Components](/docs/app/api-reference/components) * [Font](/docs/app/api-reference/components/font) * [<Image>](/docs/app/api-reference/components/image) * [<Link>](/docs/app/api-reference/components/link) * [<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, icon, and apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Fetching data on the server](#fetching-data-on-the-server) * [Fetching data where it's needed](#fetching-data-where-its-needed) * [Streaming](#streaming) * [Parallel and sequential data fetching](#parallel-and-sequential-data-fetching) * [Sequential Data Fetching](#sequential-data-fetching) * [Parallel Data Fetching](#parallel-data-fetching) * [Preloading Data](#preloading-data) * [Using React cache, server-only, and the Preload Pattern](#using-react-cache-server-only-and-the-preload-pattern) * [Preventing sensitive data from being exposed to the client](#preventing-sensitive-data-from-being-exposed-to-the-client) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/02-data-fetching/03-patterns.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Data Fetching](/docs/app/building-your-application/data-fetching)Data Fetching Patterns and Best Practices Patterns and Best Practices =========================== There are a few recommended patterns and best practices for fetching data in React and Next.js. This page will go over some of the most common patterns and how to use them. [Fetching data on the server](#fetching-data-on-the-server) ----------------------------------------------------------- Whenever possible, we recommend fetching data on the server with Server Components. This allows you to: * Have direct access to backend data resources (e.g. databases). * Keep your application more secure by preventing sensitive information, such as access tokens and API keys, from being exposed to the client. * Fetch data and render in the same environment. This reduces both the back-and-forth communication between client and server, as well as the [work on the main thread](https://vercel.com/blog/how-react-18-improves-application-performance) on the client. * Perform multiple data fetches with single round-trip instead of multiple individual requests on the client. * Reduce client-server [waterfalls](#parallel-and-sequential-data-fetching). * Depending on your region, data fetching can also happen closer to your data source, reducing latency and improving performance. Then, you can mutate or update data with [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). [Fetching data where it's needed](#fetching-data-where-its-needed) ------------------------------------------------------------------ If you need to use the same data (e.g. current user) in multiple components in a tree, you do not have to fetch data globally, nor forward props between components. Instead, you can use `fetch` or React `cache` in the component that needs the data without worrying about the performance implications of making multiple requests for the same data. This is possible because `fetch` requests are automatically memoized. Learn more about [request memoization](/docs/app/building-your-application/caching#request-memoization) > **Good to know**: This also applies to layouts, since it's not possible to pass data between a parent layout and its children. [Streaming](#streaming) ----------------------- Streaming and [Suspense](https://react.dev/reference/react/Suspense) are React features that allow you to progressively render and incrementally stream rendered units of the UI to the client. With Server Components and [nested layouts](/docs/app/building-your-application/routing/pages-and-layouts), you're able to instantly render parts of the page that do not specifically require data, and show a [loading state](/docs/app/building-your-application/routing/loading-ui-and-streaming) for parts of the page that are fetching data. This means the user does not have to wait for the entire page to load before they can start interacting with it.  To learn more about Streaming and Suspense, see the [Loading UI](/docs/app/building-your-application/routing/loading-ui-and-streaming) and [Streaming and Suspense](/docs/app/building-your-application/routing/loading-ui-and-streaming#streaming-with-suspense) pages. [Parallel and sequential data fetching](#parallel-and-sequential-data-fetching) ------------------------------------------------------------------------------- When fetching data inside React components, you need to be aware of two data fetching patterns: Parallel and Sequential.  * With **sequential data fetching**, requests in a route are dependent on each other and therefore create waterfalls. There may be cases where you want this pattern because one fetch depends on the result of the other, or you want a condition to be satisfied before the next fetch to save resources. However, this behavior can also be unintentional and lead to longer loading times. * With **parallel data fetching**, requests in a route are eagerly initiated and will load data at the same time. This reduces client-server waterfalls and the total time it takes to load data. ### [Sequential Data Fetching](#sequential-data-fetching) If you have nested components, and each component fetches its own data, then data fetching will happen sequentially if those data requests are different (this doesn't apply to requests for the same data as they are automatically [memoized](/docs/app/building-your-application/caching#request-memoization)). For example, the `Playlists` component will only start fetching data once the `Artist` component has finished fetching data because `Playlists` depends on the `artistID` prop: app/artist/\[username\]/page.tsx TypeScript JavaScriptTypeScript // ... async function Playlists({ artistID }: { artistID: string }) { // Wait for the playlists const playlists = await getArtistPlaylists(artistID) return ( <ul> {playlists.map((playlist) => ( <li key={playlist.id}>{playlist.name}</li> ))} </ul> ) } export default async function Page({ params: { username }, }: { params: { username: string } }) { // Wait for the artist const artist = await getArtist(username) return ( <> <h1>{artist.name}</h1> <Suspense fallback={<div>Loading...</div>}> <Playlists artistID={artist.id} /> </Suspense> </> ) } In cases like this, you can use [`loading.js`](/docs/app/building-your-application/routing/loading-ui-and-streaming) (for route segments) or [React `<Suspense>`](/docs/app/building-your-application/routing/loading-ui-and-streaming#streaming-with-suspense) (for nested components) to show an instant loading state while React streams in the result. This will prevent the whole route from being blocked by data fetching, and the user will be able to interact with the parts of the page that are not blocked. > **Blocking Data Requests:** > > An alternative approach to prevent waterfalls is to fetch data globally, at the root of your application, but this will block rendering for all route segments beneath it until the data has finished loading. This can be described as "all or nothing" data fetching. Either you have the entire data for your page or application, or none. > > Any fetch requests with `await` will block rendering and data fetching for the entire tree beneath it, unless they are wrapped in a `<Suspense>` boundary or `loading.js` is used. Another alternative is to use [parallel data fetching](#parallel-data-fetching) or the [preload pattern](#preloading-data). ### [Parallel Data Fetching](#parallel-data-fetching) To fetch data in parallel, you can eagerly initiate requests by defining them outside the components that use the data, then calling them from inside the component. This saves time by initiating both requests in parallel, however, the user won't see the rendered result until both promises are resolved. In the example below, the `getArtist` and `getArtistAlbums` functions are defined outside the `Page` component, then called inside the component, and we wait for both promises to resolve: app/artist/\[username\]/page.tsx TypeScript JavaScriptTypeScript import Albums from './albums' async function getArtist(username: string) { const res = await fetch(`https://api.example.com/artist/${username}`) return res.json() } async function getArtistAlbums(username: string) { const res = await fetch(`https://api.example.com/artist/${username}/albums`) return res.json() } export default async function Page({ params: { username }, }: { params: { username: string } }) { // Initiate both requests in parallel const artistData = getArtist(username) const albumsData = getArtistAlbums(username) // Wait for the promises to resolve const [artist, albums] = await Promise.all([artistData, albumsData]) return ( <> <h1>{artist.name}</h1> <Albums list={albums}></Albums> </> ) } To improve the user experience, you can add a [Suspense Boundary](/docs/app/building-your-application/routing/loading-ui-and-streaming) to break up the rendering work and show part of the result as soon as possible. [Preloading Data](#preloading-data) ----------------------------------- Another way to prevent waterfalls is to use the preload pattern. You can optionally create a `preload` function to further optimize parallel data fetching. With this approach, you don't have to pass promises down as props. The `preload` function can also have any name as it's a pattern, not an API. components/Item.tsx TypeScript JavaScriptTypeScript import { getItem } from '@/utils/get-item' export const preload = (id: string) => { // void evaluates the given expression and returns undefined // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Operators/void void getItem(id) } export default async function Item({ id }: { id: string }) { const result = await getItem(id) // ... } app/item/\[id\]/page.tsx TypeScript JavaScriptTypeScript import Item, { preload, checkIsAvailable } from '@/components/Item' export default async function Page({ params: { id }, }: { params: { id: string } }) { // starting loading item data preload(id) // perform another asynchronous task const isAvailable = await checkIsAvailable() return isAvailable ? <Item id={id} /> : null } ### [Using React `cache`, `server-only`, and the Preload Pattern](#using-react-cache-server-only-and-the-preload-pattern) You can combine the `cache` function, the `preload` pattern, and the `server-only` package to create a data fetching utility that can be used throughout your app. utils/get-item.ts TypeScript JavaScriptTypeScript import { cache } from 'react' import 'server-only' export const preload = (id: string) => { void getItem(id) } export const getItem = cache(async (id: string) => { // ... }) With this approach, you can eagerly fetch data, cache responses, and guarantee that this data fetching [only happens on the server](/docs/app/building-your-application/rendering/composition-patterns#keeping-server-only-code-out-of-the-client-environment). The `utils/get-item` exports can be used by Layouts, Pages, or other components to give them control over when an item's data is fetched. > **Good to know:** > > * We recommend using the [`server-only` package](/docs/app/building-your-application/rendering/composition-patterns#keeping-server-only-code-out-of-the-client-environment) to make sure server data fetching functions are never used on the client. [Preventing sensitive data from being exposed to the client](#preventing-sensitive-data-from-being-exposed-to-the-client) ------------------------------------------------------------------------------------------------------------------------- We recommend using React's taint APIs, [`taintObjectReference`](https://react.dev/reference/react/experimental_taintObjectReference) and [`taintUniqueValue`](https://react.dev/reference/react/experimental_taintUniqueValue), to prevent whole object instances or sensitive values from being passed to the client. To enable tainting in your application, set the Next.js Config `experimental.taint` option to `true`: next.config.js module.exports = { experimental: { taint: true, }, } Then pass the object or value you want to taint to the `experimental_taintObjectReference` or `experimental_taintUniqueValue` functions: app/utils.ts TypeScript JavaScriptTypeScript import { queryDataFromDB } from './api' import { experimental_taintObjectReference, experimental_taintUniqueValue, } from 'react' export async function getUserData() { const data = await queryDataFromDB() experimental_taintObjectReference( 'Do not pass the whole user object to the client', data ) experimental_taintUniqueValue( "Do not pass the user's address to the client", data, data.address ) return data } app/page.tsx TypeScript JavaScriptTypeScript import { getUserData } from './data' export async function Page() { const userData = getUserData() return ( <ClientComponent user={userData} // this will cause an error because of taintObjectReference address={userData.address} // this will cause an error because of taintUniqueValue /> ) } Learn more about [Security and Server Actions](https://nextjs.org/blog/security-nextjs-server-components-actions). [Previous Server Actions and Mutations ](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) [Next Rendering ](/docs/app/building-your-application/rendering) Was this helpful? supported. Send

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ran **May 23**. Check out the announcements. Vercel Ship 24 [Watch the Keynote](https://vercel.com/ship?utm_source=next_site&utm_medium=web&utm_campaign=vercel_ship&utm_content=next_site_home) Vercel Ship 24 ran **May 23**. Check out the announcements. [Watch the Keynote](https://vercel.com/ship?utm_source=next_site&utm_medium=web&utm_campaign=vercel_ship&utm_content=next_site_home)  The React Framework for the Web =============================== Used by some of the world's largest companies, Next.js enables you to create **high-quality web applications** with the power of React components. [Get Started](/docs)[Learn Next.js](/learn?utm_source=next-site&utm_medium=homepage-cta&utm_campaign=home) ▲ ~ npx create-next-app@latest What's in Next.js? ------------------ Everything you need to build great products on the web. [ Original 1440px 375px Built-in Optimizations Automatic Image, Font, and Script Optimizations for improved UX and Core Web Vitals. ](/docs/app/building-your-application/optimizing/images)[ Data Fetching Make your React component async and await your data. Next.js supports both server and client data fetching. ](/docs/app/building-your-application/data-fetching)[ Server Actions Run server code by calling a function. Skip the API. Then, easily revalidate cached data and update your UI in one network roundtrip. ](/docs/app/building-your-application/data-fetching/forms-and-mutations)[ Advanced Routing & Nested Layouts Create routes using the file system, including support for more advanced routing patterns and UI layouts. ](/docs/app/building-your-application/routing) [ Dynamic HTML Streaming Instantly stream UI from the server, integrated with the App Router and React Suspense. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[ CSS Support Style your application with your favorite tools, including support for CSS Modules, Tailwind CSS, and popular community libraries. ](/docs/app/building-your-application/styling)[ Route Handlers Build API endpoints to securely connect with third-party services for handling auth or listening for webhooks. ](/docs/app/building-your-application/routing/router-handlers)[ Middleware Take control of the incoming request. Use code to define routing and access rules for authentication, experimentation, and internationalization. ](/docs/app/building-your-application/routing/middleware) [  React Server Components Add components without sending additional client-side JavaScript. Built on the latest React features. ](/docs/getting-started/react-essentials)[ Client and Server Rendering Flexible rendering and caching options, including Incremental Static Regeneration (ISR), on a per-page level. ](/docs/app/building-your-application/rendering)[ Next.js 14 The power of full-stack to the frontend. Read the release notes. ](/blog/next-14) [  Built-in Optimizations Automatic Image, Font, and Script Optimizations for improved UX and Core Web Vitals. ](/docs/app/building-your-application/optimizing/images)[  React Server Components Add components without sending additional client-side JavaScript. Built on the latest React features. ](/docs/getting-started/react-essentials)[ Data Fetching Make your React component async and await your data. Next.js supports both server and client data fetching. ](/docs/app/building-your-application/data-fetching)[ Server Actions Run server code by calling a function. Skip the API. Then, easily revalidate cached data and update your UI in one network roundtrip. ](/docs/app/building-your-application/data-fetching/forms-and-mutations)[ Advanced Routing & Nested Layouts Create routes using the file system, including support for more advanced routing patterns and UI layouts. ](/docs/app/building-your-application/routing) [ Dynamic HTML Streaming Instantly stream UI from the server, integrated with the App Router and React Suspense. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[ CSS Support Style your application with your favorite tools, including support for CSS Modules, Tailwind CSS, and popular community libraries. ](/docs/app/building-your-application/styling)[ Route Handlers Build API endpoints to securely connect with third-party services for handling auth or listening for webhooks. ](/docs/app/building-your-application/routing/router-handlers)[ Middleware Take control of the incoming request. Use code to define routing and access rules for authentication, experimentation, and internationalization. ](/docs/app/building-your-application/routing/middleware)[ Client and Server Rendering Flexible rendering and caching options, including Incremental Static Regeneration (ISR), on a per-page level. ](/docs/app/building-your-application/rendering)[ Next.js 14 The power of full-stack to the frontend. Read the release notes. ](/blog/next-14) [  Built-in Optimizations Automatic Image, Font, and Script Optimizations for improved UX and Core Web Vitals. ](/docs/app/building-your-application/optimizing/images)[ Dynamic HTML Streaming Instantly stream UI from the server, integrated with the App Router and React Suspense. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[  React Server Components Add components without sending additional client-side JavaScript. Built on the latest React features. ](/docs/getting-started/react-essentials) [ Data Fetching Make your React component async and await your data. Next.js supports both server and client data fetching. ](/docs/app/building-your-application/data-fetching)[ Server Actions Run server code by calling a function. Skip the API. Then, easily revalidate cached data and update your UI in one network roundtrip. ](/docs/app/building-your-application/data-fetching/forms-and-mutations)[ Advanced Routing & Nested Layouts Create routes using the file system, including support for more advanced routing patterns and UI layouts. ](/docs/app/building-your-application/routing)[ CSS Support Style your application with your favorite tools, including support for CSS Modules, Tailwind CSS, and popular community libraries. ](/docs/app/building-your-application/styling)[ Route Handlers Build API endpoints to securely connect with third-party services for handling auth or listening for webhooks. ](/docs/app/building-your-application/routing/router-handlers)[ Middleware Take control of the incoming request. Use code to define routing and access rules for authentication, experimentation, and internationalization. ](/docs/app/building-your-application/routing/middleware)[ Client and Server Rendering Flexible rendering and caching options, including Incremental Static Regeneration (ISR), on a per-page level. ](/docs/app/building-your-application/rendering) [ Next.js 14 The power of full-stack to the frontend. Read the release notes. ](/blog/next-14) Built on a foundation of fast, production-grade tooling -------------------------------------------------------  Powered By [  ReactThe library for web and native user interfaces. Next.js is built on the latest React features, including Server Components and Actions. ](https://react.dev)[  TurbopackAn incremental bundler optimized for JavaScript and TypeScript, written in Rust , and built into Next.js. ](https://turbo.build)[  Speedy Web CompilerAn extensible Rust  based platform for the next generation of fast developer tools, and can be used for both compilation and minification. ](https://swc.rs) Get started in seconds ---------------------- Deploy Next.js to Vercel StarterEcommerceBlogAIEdge FunctionsEdge ConfigPortfolioSaaSMulti-tenant AppsRealtime AppsDocumentationVirtual EventWeb3 Vercel is a frontend cloud from the creators of Next.js, making it easy to get started with Next.js quickly. Jumpstart your Next.js development with pre-built solutions from Vercel and our community. 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[View the Next.js Showcase](/showcase) Customer Testimonials --------------------- > ### “With Next.js at the helm of our headless tech stack, our developers can create features with velocity and speed, ultimately enabling users to create whatever, whenever they want to.” Tatiana Mac, Senior Software Engineer > ### “My favorite UX feedback from customers is: "How is the app so fast?" Because we’ve built on Next.js and Vercel since day one, our pages load in an instant, which is important when it comes to mission-critical software.” Fouad Matin, CEO > ### “Next.js has been a game-changer for our agency work and team collaboration. Its powerful features have allowed us to build high-performance websites quickly and efficiently like never before.” Daniel Lopes, Frontend Developer

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Start building with Next.js =========================== Go from beginner to expert by learning the foundations of Next.js and building a fully functional demo website that uses all the latest features. Learn Next.js Learn Next.js 16 chapters that take you from React to Next.js. [Placeholder](/learn) Learn React Foundations New to React? Learn how to go from JavaScript to React with this Foundations course. [React Foundations](/learn/react-foundations) How does the course work? ------------------------- By building a full web application. Step by step.  Set up your local environment and initializing the "ACME" Next.js project template. Use pre-styled components as part of each chapter that leverage Next.js conventions and patterns. Hook up real application logic and data to bring a fully-fledged demo website to life. At the end you’ll have a website that’s ready to ship and the knowledge to build and deploy your own. Your progress will be synced as you complete chapters Go at your own pace and pick up where you left off Test your knowledge during each chapter Take quick quizzes to see what you’ve learned What will I learn? ------------------ Here’s everything that’s covered in the course. [ Introduction Learn how to build a full-stack web application with the free, Next.js App Router Course. ](/learn/dashboard-app) [ 1 Getting Started Create a new Next.js application using the dashboard starter example and explore the project. ](/learn/dashboard-app/getting-started) [ 2 CSS Styling Style your Next.js application with Tailwind and CSS modules. ](/learn/dashboard-app/css-styling) [ 3 Optimizing Fonts and Images Optimize fonts and images with the Next.js built-in components. ](/learn/dashboard-app/optimizing-fonts-images) [ 4 Creating Layouts and Pages Create the dashboard routes and a shared layout that can be shared between multiple pages. ](/learn/dashboard-app/creating-layouts-and-pages) [ 5 Navigating Between Pages Learn how to use the <Link> component to navigate between pages. ](/learn/dashboard-app/navigating-between-pages) [ 6 Setting Up Your Database Setup a database for your application and seed it with initial data. ](/learn/dashboard-app/setting-up-your-database) [ 7 Fetching Data Learn about the different ways to fetch data in Next.js, and fetch data for your dashboard page using Server Components. ](/learn/dashboard-app/fetching-data) [ 8 Static and Dynamic Rendering Understand how rendering works in Next.js, and make your dashboard app dynamic. ](/learn/dashboard-app/static-and-dynamic-rendering) [ 9 Streaming Improve your application's loading experience with streaming and loading skeletons. ](/learn/dashboard-app/streaming) [ 10 Partial Prerendering An early look into Partial Prerendering and how it works. ](/learn/dashboard-app/partial-prerendering) [ 11 Adding Search and Pagination Add search and pagination to your dashboard application using Next.js APIs. ](/learn/dashboard-app/adding-search-and-pagination) [ 12 Mutating Data Mutate data using React Server Actions, and revalidate the Next.js cache. ](/learn/dashboard-app/mutating-data) [ 13 Handling Errors Handle errors gracefully with error.tsx and notFound. ](/learn/dashboard-app/error-handling) [ 14 Improving Accessibility Implement server-side form validation and improve accessibility in your forms. ](/learn/dashboard-app/improving-accessibility) [ 15 Adding Authentication Add authentication to protect your dashboard routes using NextAuth.js, Server Actions, and Middleware. ](/learn/dashboard-app/adding-authentication) [ 16 Adding Metadata Learn how to add metadata to your Next.js application. ](/learn/dashboard-app/adding-metadata) [ 17 Next Steps Next.js Dashboard Course Conclusion ](/learn/dashboard-app/next-steps) [Placeholder](/learn) Looking to go deeper? Continue learning by using our guides. [View All Guides](https://vercel.com/guides?topics=frameworks) [ How to build a fullstack app with Next.js, Prisma and Postgres Build, Deployment & Git ](https://vercel.com/guides/nextjs-prisma-postgres)[ Build a multi-tenant app with custom domains using Next.js Build, Deployment & Git ](https://vercel.com/guides/nextjs-multi-tenant-application)[ Integrating Next.js and Contentful for your headless CMS Databases & CMS ](https://vercel.com/guides/integrating-next-js-and-contentful-for-your-headless-cms)[ Building Ecommerce Sites with Next.js and Shopify Databases & CMS ](https://vercel.com/guides/building-ecommerce-sites-with-next-js-and-shopify)[ Using headless WordPress with Next.js and Vercel Databases & CMS ](https://vercel.com/guides/wordpress-with-vercel) Next.js Documentation The complete resource for installing, running, building with, and deploying Next.js [View the Documentation](https://nextjs.org/docs)

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Menu Using App Router Features available in /app * [Getting Started](/docs/getting-started) * [Installation](/docs/getting-started/installation) * [Project Structure](/docs/getting-started/project-structure) * [Building Your Application](/docs/app/building-your-application) * [Routing](/docs/app/building-your-application/routing) * [Defining Routes](/docs/app/building-your-application/routing/defining-routes) * [Pages and Layouts](/docs/app/building-your-application/routing/pages-and-layouts) * [Linking and Navigating](/docs/app/building-your-application/routing/linking-and-navigating) * [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [Error Handling](/docs/app/building-your-application/routing/error-handling) * [Redirecting](/docs/app/building-your-application/routing/redirecting) * [Route Groups](/docs/app/building-your-application/routing/route-groups) * [Project Organization](/docs/app/building-your-application/routing/colocation) 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[reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[API Reference](/docs/app/api-reference)Functions Functions ========= [ ### cookies API Reference for the cookies function. ](/docs/app/api-reference/functions/cookies)[ ### draftMode API Reference for the draftMode function. ](/docs/app/api-reference/functions/draft-mode)[ ### fetch API reference for the extended fetch function. ](/docs/app/api-reference/functions/fetch)[ ### generateImageMetadata Learn how to generate multiple images in a single Metadata API special file. ](/docs/app/api-reference/functions/generate-image-metadata)[ ### generateMetadata Learn how to add Metadata to your Next.js application for improved search engine optimization (SEO) and web shareability. ](/docs/app/api-reference/functions/generate-metadata)[ ### generateSitemaps Learn how to use the generateSiteMaps function to create multiple sitemaps for your application. ](/docs/app/api-reference/functions/generate-sitemaps)[ ### generateStaticParams API reference for the generateStaticParams function. ](/docs/app/api-reference/functions/generate-static-params)[ ### generateViewport API Reference for the generateViewport function. ](/docs/app/api-reference/functions/generate-viewport)[ ### headers API reference for the headers function. ](/docs/app/api-reference/functions/headers)[ ### ImageResponse API Reference for the ImageResponse constructor. ](/docs/app/api-reference/functions/image-response)[ ### NextRequest API Reference for NextRequest. ](/docs/app/api-reference/functions/next-request)[ ### NextResponse API Reference for NextResponse. ](/docs/app/api-reference/functions/next-response)[ ### notFound API Reference for the notFound function. ](/docs/app/api-reference/functions/not-found)[ ### permanentRedirect API Reference for the permanentRedirect function. ](/docs/app/api-reference/functions/permanentRedirect)[ ### redirect API Reference for the redirect function. ](/docs/app/api-reference/functions/redirect)[ ### revalidatePath API Reference for the revalidatePath function. ](/docs/app/api-reference/functions/revalidatePath)[ ### revalidateTag API Reference for the revalidateTag function. ](/docs/app/api-reference/functions/revalidateTag)[ ### unstable\_cache API Reference for the unstable\_cache function. ](/docs/app/api-reference/functions/unstable_cache)[ ### unstable\_noStore API Reference for the unstable\_noStore function. ](/docs/app/api-reference/functions/unstable_noStore)[ ### useParams API Reference for the useParams hook. ](/docs/app/api-reference/functions/use-params)[ ### usePathname API Reference for the usePathname hook. ](/docs/app/api-reference/functions/use-pathname)[ ### useReportWebVitals API Reference for the useReportWebVitals function. ](/docs/app/api-reference/functions/use-report-web-vitals)[ ### useRouter API reference for the useRouter hook. ](/docs/app/api-reference/functions/use-router)[ ### useSearchParams API Reference for the useSearchParams hook. ](/docs/app/api-reference/functions/use-search-params)[ ### useSelectedLayoutSegment API Reference for the useSelectedLayoutSegment hook. ](/docs/app/api-reference/functions/use-selected-layout-segment)[ ### useSelectedLayoutSegments API Reference for the useSelectedLayoutSegments hook. ](/docs/app/api-reference/functions/use-selected-layout-segments)[ ### userAgent The userAgent helper extends the Web Request API with additional properties and methods to interact with the user agent object from the request. ](/docs/app/api-reference/functions/userAgent) [Previous sitemap.xml ](/docs/app/api-reference/file-conventions/metadata/sitemap) [Next cookies ](/docs/app/api-reference/functions/cookies) Was this helpful? supported. 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This early version allows you to test the latest features before the upcoming stable release. * [React RC](/blog/next-15-rc#react-19-rc) * [Caching defaults changes](/blog/next-15-rc#caching-updates) * [Incremental Partial Prerendering adoption](/blog/next-15-rc#incremental-adoption-of-partial-prerendering-experimental) * [next/after (Experimental)](/blog/next-15-rc#executing-code-after-a-response-with-nextafter-experimental) * [New create-next-app design](/blog/next-15-rc#create-next-app-updates) * [Bundling external packages (Stable)](/blog/next-15-rc#optimizing-bundling-of-external-packages-stable) [Read More](/blog/next-15-rc) April 11th, 2024   [Next.js 14.2](/blog/next-14-2) Next.js 14.2 includes development, production, and caching improvements. * [Turbopack (Release Candidate)](/blog/next-14-2#turbopack-for-development-release-candidate) * [Caching Improvements](/blog/next-14-2#caching-improvements) * [Build and Production Improvements](/blog/next-14-2#build-and-production-improvements) * [Errors DX Improvements](/blog/next-14-2#errors-dx-improvements) [Read More](/blog/next-14-2) January 18th, 2024   [Next.js 14.1](/blog/next-14-1) Next.js 14.1 includes developer experience improvements including: * [Improved Self-Hosting](/blog/next-14-1#improved-self-hosting) * [Turbopack Improvements](/blog/next-14-1#turbopack-improvements) * [DX Improvements](/blog/next-14-1#developer-experience-improvements) * [Parallel & Intercepted Routes](/blog/next-14-1#parallel--intercepted-routes) * [`next/image` Improvements](/blog/next-14-1#nextimage-support-for-picture-and-art-direction) [Read More](/blog/next-14-1) October 26th, 2023   [Next.js 14](/blog/next-14) As we announced at [Next.js Conf](https://nextjs.org/conf), Next.js 14 is our most focused release with: * [Turbopack](/blog/next-14#nextjs-compiler-turbocharged) * **53% faster** local server startup * **94% faster** code updates * [Server Actions (Stable)](/blog/next-14#forms-and-mutations) * [Partial Prerendering (Preview)](/blog/next-14#partial-prerendering-preview) * [Next.js Learn (New)](/blog/next-14#nextjs-learn-course) [Read More](/blog/next-14) October 23rd, 2023  [How to Think About Security in Next.js](/blog/security-nextjs-server-components-actions) React Server Components (RSC) in App Router is a novel paradigm that eliminates much of the redundancy and potential risks linked with conventional methods. Given the newness, developers and subsequently security teams may find it challenging to align their existing security protocols with this model. [Read More](/blog/security-nextjs-server-components-actions) September 19th, 2023    [Next.js 13.5](/blog/next-13-5) Next.js 13.5 improves local dev performance and reliability with: * [22% faster local server startup](/blog/next-13-5#improving-startup-and-fast-refresh-time) * [29% faster HMR (Fast Refresh)](/blog/next-13-5#improving-startup-and-fast-refresh-time) * [40% less memory usage](/blog/next-13-5#improving-startup-and-fast-refresh-time) * [Optimized Package Imports](/blog/next-13-5#optimized-package-imports) * [`next/image` Improvements](/blog/next-13-5#nextimage-improvements) * [And over 438 bugs patched!](/blog/next-13-5#other-improvements) [Read More](/blog/next-13-5) June 22nd, 2023   [Next.js App Router Update](/blog/june-2023-update) For the next release (and coming months) we're focused on the following areas: * **Performance** * **Stability** * **Developer Experience** [Read More](/blog/june-2023-update) May 4th, 2023   [Next.js 13.4](/blog/next-13-4) Next.js 13.4 is a foundational release, marking stability for the App Router: * [App Router (Stable)](/blog/next-13-4#nextjs-app-router) * [Turbopack (Beta)](/blog/next-13-4#turbopack-beta) * [Server Actions (Alpha)](/blog/next-13-4#server-actions-alpha) [Read More](/blog/next-13-4) April 6th, 2023   [Next.js 13.3](/blog/next-13-3) Next.js 13.3 adds popular community-requested features and is the last release before the App Router is stable, including: * [File-Based Metadata API](/blog/next-13-3#file-based-metadata-api) * [Dynamic Open Graph Images](/blog/next-13-3#dynamic-open-graph-image-generation) * [Static Export for App Router](/blog/next-13-3#static-export-for-app-router) * [Parallel Routes and Interception](/blog/next-13-3#parallel-routes-and-interception) [Read More](/blog/next-13-3) February 23rd, 2023   +1 [Next.js 13.2](/blog/next-13-2) Next.js 13.2 includes major improvements to the App Router (`app`) in preparation for stability: * [Built-in SEO Support](/blog/next-13-2#built-in-seo-support-with-new-metadata-api) * [Route Handlers](/blog/next-13-2#custom-route-handlers) * [MDX for Server Components](/blog/next-13-2#mdx-for-server-components) * [Rust MDX Parser](/blog/next-13-2#rust-mdx-parser) * [Improved Error Overlay](/blog/next-13-2#improved-error-overlay) * [Statically Typed Links (Beta)](/blog/next-13-2#statically-typed-links) * [Turbopack Improvements (Alpha)](/blog/next-13-2#turbopack-improvements) * [Next.js Cache (Beta)](/blog/next-13-2#nextjs-cache) [Read More](/blog/next-13-2) December 22nd, 2022   [Next.js 13.1](/blog/next-13-1) Next.js 13.1 includes improvements to both the `pages` and `app` directories: * [`app` Directory (Beta) Improvements](/blog/next-13-1#improved-stability-and-support-for-app-directory) * [Built-in Module Transpilation](/blog/next-13-1#built-in-module-transpilation-stable) * [Edge Runtime (Stable)](#a-light-nodejs-runtime-for-the-edge-now-stable-for-api-routes) * [Turbopack Updates](/blog/next-13-1#turbopack-improvements) * [Middleware Improvements](/blog/next-13-1#nextjs-advanced-middleware) * [SWC Import Resolution](/blog/next-13-1#import-resolution-for-smaller-bundles) [Read More](/blog/next-13-1) October 25th, 2022   +8 [Next.js 13](/blog/next-13) As we announced at [Next.js Conf](https://nextjs.org/conf), Next.js 13 (stable) lays the foundations to be dynamic without limits: * [`app/` Directory (beta)](/blog/next-13#new-app-directory-beta) * [Layouts](/blog/next-13#layouts) * [React Server Components](/blog/next-13#server-components) * [Streaming](/blog/next-13#streaming) * [Turbopack (alpha)](/blog/next-13#introducing-turbopack-alpha) * [New `next/image` (stable)](/blog/next-13#nextimage) * [New `@next/font` (beta)](/blog/next-13#nextfont) * [Improved `next/link`](/blog/next-13#breaking-changes) [Read More](/blog/next-13) September 8th, 2022   +5 [Next.js 12.3](/blog/next-12-3) We've shipped some quality-of-life improvements to Next.js with 12.3: * [Improved Fast Refresh](/blog/next-12-3#improved-fast-refresh) * [TypeScript Auto-Install](/blog/next-12-3#typescript-auto-install) * [Image Component](/blog/next-12-3#image-component) * [SWC Minifier](/blog/next-12-3##swc-minifier-stable) * [New Router + Layouts Update](/blog/next-12-3#new-router-and-layouts-update) [Read More](/blog/next-12-3) June 28th, 2022   +8 [Next.js 12.2](/blog/next-12-2) We're laying the foundation for the future of Next.js with 12.2: * [Middleware (Stable)](/blog/next-12-2#middleware-stable) * [On-Demand ISR (Stable)](/blog/next-12-2#on-demand-incremental-static-regeneration-stable) * [Edge API Routes (Experimental)](/blog/next-12-2#edge-api-routes-experimental) * [Edge SSR (Experimental)](/blog/next-12-2#edge-server-rendering-experimental) * [SWC Plugins (Experimental)](/blog/next-12-2#swc-plugins-experimental) * [Improvements to `next/image`](/blog/next-12-2#improvements-to-nextimage) [Read More](/blog/next-12-2) May 23rd, 2022   +1 [Layouts RFC](/blog/layouts-rfc) This RFC outlines the biggest update to Next.js since it was introduced in 2016: * **Nested Layouts:** Build complex applications with nested routes. * **Designed for Server Components:** Optimized for subtree navigation. * **Improved Data Fetching:** Fetch in layouts while avoiding waterfalls. * **Using React 18 Features:** Streaming, Transitions, and Suspense. * **Client and Server Routing:** Server-centric routing with _SPA-like_ behavior. * **100% incrementally adoptable**: No breaking changes so you can adopt gradually. * **Advanced Routing Conventions**: Offscreen stashing, instant transitions, and more. [Read More](/blog/layouts-rfc) February 17th, 2022   +9 [Next.js 12.1](/blog/next-12-1) We're excited to release one of our most requested features with Next.js 12.1: * [On-demand ISR (Beta)](/blog/next-12-1#on-demand-incremental-static-regeneration-beta) * [Expanded Support for SWC](/blog/next-12-1#improved-swc-support) * [`next/jest` Plugin](/blog/next-12-1#zero-configuration-jest-plugin) * [Faster Minification with SWC (RC)](/blog/next-12-1#faster-minification-with-swc) * [Self-Hosting Improvements](/blog/next-12-1#self-hosted-nextjs-improvements) * [React 18 & Server Components (Alpha)](/blog/next-12-1#react-18-server-components-and-ssr-streaming-alpha) * [Developer Survey](/blog/next-12-1#nextjs-developer-survey) [Read More](/blog/next-12-1) October 26th, 2021   +9 [Next.js 12](/blog/next-12) As we announced at [Next.js Conf](https://nextjs.org/conf), Next.js 12 is our biggest release ever: * [Rust Compiler](/blog/next-12#faster-builds-and-fast-refresh-with-rust-compiler) * [Middleware (beta)](/blog/next-12#introducing-middleware) * [React 18 Support](/blog/next-12#preparing-for-react-18) * [`<Image />` AVIF Support](/blog/next-12#smaller-images-using-avif) * [Bot-aware ISR Fallback](/blog/next-12#bot-aware-isr-fallback) * [Native ES Modules Support](/blog/next-12#es-modules-support-and-url-imports) * [URL Imports (alpha)](/blog/next-12#url-imports) * [React Server Components (alpha)](/blog/next-12#react-server-components) [Read More](/blog/next-12) August 11th, 2021   +5 [Next.js 11.1](/blog/next-11-1) We're improving build performance across the entire stack with Next.js 11.1, featuring: * [Security Patch](/blog/next-11-1#security-patch) * [ES Modules Support](/blog/next-11-1#es-modules-support) * [Rust-based Tooling](/blog/next-11-1#adopting-rust-based-swc) * [Faster Data Fetching](/blog/next-11-1#builds--data-fetching) * [Faster Source Maps](/blog/next-11-1#source-maps) * [ESLint Integration Improvements](/blog/next-11-1#eslint-improvements) * [`next/image` Improvements](/blog/next-11-1#nextimage-improvements) [Read More](/blog/next-11-1) June 15th, 2021   +1 [Next.js 11](/blog/next-11) Our mission to create the best developer experience continues with Next.js 11, featuring: * [Conformance](/blog/next-11#conformance) * [Improved Performance](/blog/next-11#improved-performance) * [`next/script`](/blog/next-11#script-optimization) * [`next/image` Improvements](/blog/next-11#image-improvements) * [Webpack 5](/blog/next-11#webpack-5) * [Create React App Migration (Experimental)](/blog/next-11#cra-migration) * [Next.js Live (Preview Release)](/blog/next-11#nextjs-live-preview-release) [Read More](/blog/next-11) April 28th, 2021   +2 [Next.js 10.2](/blog/next-10-2) We are excited to introduce Next.js 10.2, featuring: * [Faster Builds](/blog/next-10-2#webpack-5) * [Faster Refresh](/blog/next-10-2#webpack-5) * [Faster Startup](/blog/next-10-2#improved-startup-performance) * [Improved Accessibility](/blog/next-10-2#accessibility-improvements) * [More Flexible Redirects and Rewrites](/blog/next-10-2#routing-based-on-headers-and-query-string-parameters) * [Automatic Webfont Optimization](/blog/next-10-2#automatic-webfont-optimization) [Read More](/blog/next-10-2) March 29th, 2021   +5 [Next.js 10.1](/blog/next-10-1) We are excited to introduce Next.js 10.1, featuring: * [3x Faster Refresh](/blog/next-10-1#3x-faster-refresh) * [Improved Installation Time](/blog/next-10-1#improved-installation-time) * [`next/image` Improvements](/blog/next-10-1#nextimage-improvements) * [Next.js Commerce Shopify Integration](/blog/next-10-1#nextjs-commerce-shopify-integration) * [Custom 500 Page](/blog/next-10-1#custom-500-page) * [Strict PostCSS Configuration Loading](/blog/next-10-1#strict-postcss-configuration-loading) * [Support for `extends` in `tsconfig.json`](/blog/next-10-1#support-for-extends-in-tsconfigjson) * [Detect When Preview Mode Is Enabled](/blog/next-10-1#detect-when-preview-mode-is-enabled) * [Router Methods Scroll to Top](/blog/next-10-1#router-methods-scroll-to-top) * [Documentation Improvements](/blog/next-10-1#documentation-improvements) [Read More](/blog/next-10-1) November 18th, 2020  [Incrementally Adopting Next.js](/blog/incremental-adoption) [Next.js](https://nextjs.org/) has been designed for gradual adoption. With Next.js, you can continue using your existing code and add as much (or as little) React as you need. By starting small and incrementally adding more pages, you can prevent derailing feature work by avoiding a complete rewrite. Many companies need to modernize their tech stack to reduce costs, increase developer productivity, and provide the best experience for their customers. Component-driven development has greatly improved the deployment velocity and reusability of modern codebases. And with over [8 million downloads/month](https://www.npmtrends.com/react), React is the leading component-driven choice for developers. Next.js, the React framework for production, enables you to incrementally adopt React. [Read More](/blog/incremental-adoption) October 27th, 2020   +5 [Next.js 10](/blog/next-10) We are excited to introduce Next.js 10, featuring: * [Built-in Image Component and Automatic Image Optimization](/blog/next-10#built-in-image-component-and-automatic-image-optimization) * [Internationalized Routing](/blog/next-10#internationalized-routing) * [Next.js Analytics](/blog/next-10#nextjs-analytics) * [Next.js Commerce](/blog/next-10#nextjs-commerce) * [React 17 Support](/blog/next-10#react-17-support) * [getStaticProps / getServerSideProps Fast Refresh](/blog/next-10#getstaticprops--getserversideprops-fast-refresh) * [Fast Refresh for MDX](/blog/next-10#fast-refresh-for-mdx) * [Importing CSS from Third Party React Components](/blog/next-10#importing-css-from-third-party-react-components) * [Automatic Resolving of href](/blog/next-10#automatic-resolving-of-href) * [@next/codemod CLI](/blog/next-10#nextcodemod-cli) * [Blocking Fallback for getStaticPaths](/blog/next-10#blocking-fallback-for-getstaticpaths) [Read More](/blog/next-10) July 27th, 2020   +3 [Next.js 9.5](/blog/next-9-5) We are excited today to introduce Next.js 9.5, featuring: * [Stable Incremental Static Regeneration](/blog/next-9-5#stable-incremental-static-regeneration) * [Customizable Base Path](/blog/next-9-5#customizable-base-path) * [Support for Rewrites, Redirects, and Headers](/blog/next-9-5#support-for-rewrites-redirects-and-headers) * [Optional Trailing Slash in URLs](/blog/next-9-5#optional-trailing-slash-in-urls) * [Persistent Caching for Page Bundles](/blog/next-9-5#persistent-caching-for-page-bundles) * [Fast Refresh Enhancements](/blog/next-9-5#fast-refresh-enhancements) * [Production React Profiling](/blog/next-9-5#production-react-profiling) * [Optional Catch All Routes](/blog/next-9-5#optional-catch-all-routes) * [Webpack 5 Support (beta)](/blog/next-9-5#webpack-5-support-beta) [Read More](/blog/next-9-5) May 11th, 2020   +2 [Next.js 9.4](/blog/next-9-4) We are excited today to introduce Next.js 9.4, featuring: * [Fast Refresh](/blog/next-9-4#fast-refresh) * [Incremental Static Regeneration (beta)](/blog/next-9-4#incremental-static-regeneration-beta) * [CMS Examples](/blog/next-9-4#cms-examples) * [New Environment Variables Support](/blog/next-9-4#new-environment-variables-support) * [Improved Built-in Fetch Support](/blog/next-9-4#improved-built-in-fetch-support) * [Integrated Web Vitals Reporting](/blog/next-9-4#integrated-web-vitals-reporting) * [Absolute Imports and Aliases](/blog/next-9-4#absolute-imports-and-aliases) * [Configurable Sass Support](/blog/next-9-4#configurable-sass-support) * [Improved Log Output](/blog/next-9-4#improved-log-output) [Read More](/blog/next-9-4) March 9th, 2020   +2 [Next.js 9.3](/blog/next-9-3) We are excited today to introduce Next.js 9.3, featuring: * [Next-gen Static Site Generation (SSG) Support](/blog/next-9-3#next-gen-static-site-generation-ssg-support) * [Preview Mode](/blog/next-9-3#preview-mode) * [Built-In Sass Support for Global Stylesheets](/blog/next-9-3#built-in-sass-support-for-global-stylesheets) * [Built-In Sass CSS Module Support for Component-Level Styles](/blog/next-9-3#built-in-sass-css-module-support-for-component-level-styles) * [Automatic Static Optimization for 404](/blog/next-9-3#automatic-static-optimization-for-404) * [32 kB Smaller Runtime](/blog/next-9-3#32-kb-smaller-runtime-15-kb-gzip) * [Next.js Community on GitHub Discussions](/blog/next-9-3#community) [Read More](/blog/next-9-3) January 15th, 2020   +1 [Next.js 9.2](/blog/next-9-2) We are excited today to introduce the production-ready Next.js 9.2, featuring: * [Built-In CSS Support for Global Stylesheets](/blog/next-9-2#built-in-css-support-for-global-stylesheets) * [Built-In CSS Module Support for Component-Level Styles](/blog/next-9-2#built-in-css-module-support-for-component-level-styles) * [Improved Code-Splitting Strategy](/blog/next-9-2#improved-code-splitting-strategy) * [Catch-All Dynamic Routes](/blog/next-9-2#catch-all-dynamic-routes) [Read More](/blog/next-9-2) January 9th, 2020   +1 [New Next.js Documentation](/blog/new-documentation) We're excited to announce the new Next.js documentation, featuring: * [Improved Content](/blog/new-documentation#improved-content) * [Search](/blog/new-documentation#search) * [API Reference](/blog/new-documentation#api-reference) [Read More](/blog/new-documentation) January 6th, 2020   +1 [Next.js 9.1.7](/blog/next-9-1-7) [Next.js 9](/blog/next-9) was released six (6) months ago, followed by [Next.js 9.1](/blog/next-9-1) three (3) months ago. These two releases added very powerful new features to Next.js, without increasing our baseline client runtime size. Since then, we've focused heavily on refining and improving the framework as a whole: [9.1.1](https://github.com/vercel/next.js/releases/tag/v9.1.1), [9.1.2](https://github.com/vercel/next.js/releases/tag/v9.1.2), [9.1.3](https://github.com/vercel/next.js/releases/tag/v9.1.3), [9.1.4](https://github.com/vercel/next.js/releases/tag/v9.1.4), [9.1.5](https://github.com/vercel/next.js/releases/tag/v9.1.5), [9.1.6](https://github.com/vercel/next.js/releases/tag/v9.1.6), and [9.1.7](https://github.com/vercel/next.js/releases/tag/v9.1.7). Let's dive into what these releases have improved! * [3% – 8%+ Smaller Client-Side JavaScript Size](/blog/next-9-1-7#3--8-smaller-client-side-javascript-size) * [Redesigned Production Build CLI Output](/blog/next-9-1-7#redesigned-production-build-cli-output) * [New Built-In Polyfills: fetch(), URL, and Object.assign](/blog/next-9-1-7#new-built-in-polyfills-fetch-url-and-objectassign) * [Optimized Page Loading: Better FCP and TTI](/blog/next-9-1-7#optimized-page-loading-better-fcp-and-tti) * [Support for the Latest JavaScript Features](/blog/next-9-1-7#support-for-the-latest-javascript-features) * [Zero-Config Deployment Support for `next export` Applications](/blog/next-9-1-7#zero-config-deployment-support-for-next-export-applications) * [React Strict Mode Compliance and Opt-In](/blog/next-9-1-7#react-strict-mode-compliance-and-opt-in) * [Automated Testing against Nightly React Builds](/blog/next-9-1-7#automated-testing-against-nightly-react-builds) [Read More](/blog/next-9-1-7) October 9th, 2019   [Introducing Create Next App](/blog/create-next-app) We're delighted today to introduce the new Create Next App. Create Next App sets up a modern React application powered by Next.js in one command. [Read More](/blog/create-next-app) October 7th, 2019   +1 [Next.js 9.1](/blog/next-9-1) Today, we are excited to announce Next.js 9.1 with `src` and `public` directory support. **New in This Release** * [`src` Directory Support](/blog/next-9-1#src-directory-support) * [`public` Directory Support](/blog/next-9-1#public-directory-support) **Previewing in This Release** * [Built-in CSS Support](/blog/next-9-1#built-in-css-support) * [Static Error Pages](/blog/next-9-1#static-error-pages) * [Module / Nomodule](/blog/next-9-1#module--nomodule) * [Improved Bundle Splitting](/blog/next-9-1#improved-bundle-splitting) [Read More](/blog/next-9-1) September 30th, 2019   +2 [Next.js 9.0.7](/blog/next-9-0-7) Next.js 9.0 was released approximately two months ago. Since then, we’ve been busy with 7 smaller but quite important releases: [9.0.1](https://github.com/vercel/next.js/releases/tag/v9.0.1), [9.0.2](https://github.com/vercel/next.js/releases/tag/v9.0.2), [9.0.3](https://github.com/vercel/next.js/releases/tag/v9.0.3), [9.0.4](https://github.com/vercel/next.js/releases/tag/v9.0.4), [9.0.5](https://github.com/vercel/next.js/releases/tag/v9.0.5), [9.0.6](https://github.com/vercel/next.js/releases/tag/v9.0.6), and [9.0.7](https://github.com/vercel/next.js/releases/tag/v9.0.7). Let’s dive into what these releases have brought to your websites and applications, with absolutely no breaking changes. * [Improved Concurrency in Windows Environments](/blog/next-9-0-7#improved-concurrency-in-windows-environments) * [Gzip Compression by Default](/blog/next-9-0-7#gzip-compression-by-default) * [TypeScript Report on Active Pages Only](/blog/next-9-0-7#typescript-report-on-active-pages-only) * [Telemetry](/blog/next-9-0-7#telemetry) * [Improved next/head Element Tracking](/blog/next-9-0-7#improved-nexthead-element-tracking) * [Preventing Non-Pages in the Pages Directory](/blog/next-9-0-7#preventing-non-pages-in-the-pages-directory) * [Runtime Improvements](/blog/next-9-0-7#runtime-improvements) [Read More](/blog/next-9-0-7) July 8th, 2019   +3 [Next.js 9](/blog/next-9) Today, we're excited to announce Next.js 9 with TypeScript support, Dynamic Routing, API Routes, Automatic Static Optimization, and more! * [Built-in Zero-Config TypeScript Support](/blog/next-9#built-in-zero-config-typescript-support) * [File system-Based Dynamic Routing](/blog/next-9#dynamic-route-segments) * [Automatic Static Optimization](/blog/next-9#automatic-static-optimization) * [API Routes](/blog/next-9#api-routes) * [More Production Optimizations](/blog/next-9#production-optimizations) * [Improved DX](/blog/next-9#developer-experience-improvements) [Read More](/blog/next-9) April 16th, 2019   +2 [Next.js 8.1](/blog/next-8-1) Today, we're excited to announce we've extended the Next.js experience to authoring AMP pages. * [What is AMP](/blog/next-8-1#what-is-amp) * [AMP in Next.js](/blog/next-8-1#amp-in-nextjs) * [Hybrid AMP pages](/blog/next-8-1#hybrid-amp-pages) * [AMP-first pages](/blog/next-8-1#amp-first-pages) * [AMP Validation](/blog/next-8-1#amp-validation) [Read More](/blog/next-8-1) April 2nd, 2019   +2 [Next.js 8.0.4](/blog/next-8-0-4) We are happy to introduce the production-ready Next.js 8.0.4: * [Build performance improvements](/blog/next-8-0-4#build-performance) * [Deterministic builds](/blog/next-8-0-4#build-performance) * [Smaller client runtime](/blog/next-8-0-4#smaller-runtime-footprint) * [Smaller serverless functions](/blog/next-8-0-4#smaller-runtime-footprint) * [Default viewport tag](/blog/next-8-0-4#default-viewport-meta-tag) * [Learning guide improvements](/blog/next-8-0-4#learning-guide-improvements) [Read More](/blog/next-8-0-4) March 28th, 2019 [Styling Next.js with Styled JSX](/blog/styling-next-with-styled-jsx) [Styled JSX](https://github.com/vercel/styled-jsx) is a CSS-in-JS library that allows you to write encapsulated and scoped CSS to style your components. The styles you introduce for one component won't affect other components, allowing you to add, change and delete styles without worrying about unintended side effects. [Read More](/blog/styling-next-with-styled-jsx) February 19th, 2019   [Next.js 8 Webpack Memory Improvements](/blog/webpack-memory) Recently [Next.js 8](/blog/next-8) was introduced. The release included a massive build-time memory usage reduction. This blog post will explore how we have helped optimize webpack for the community. [Read More](/blog/webpack-memory) February 11th, 2019    [Next.js 8](/blog/next-8) We are proud today to introduce the production-ready Next.js 8, featuring: * [Serverless Next.js](/blog/next-8#serverless-nextjs) * [Massive build-time memory usage reduction](/blog/next-8#massive-build-time-memory-usage-reduction) * [Build-time environment configuration](/blog/next-8#build-time-environment-configuration) * [Prefetch performance improvements](/blog/next-8#prefetch-performance-improvements) * [Smaller initial HTML size](/blog/next-8#smaller-initial-html-size) * [Improved on-demand entries](/blog/next-8#improved-on-demand-entries) * [Faster port listening in development](/blog/next-8#faster-port-listening-in-development) * [Faster Static Export](/blog/next-8#faster-static-export) * [Head element deduplication](/blog/next-8#head-element-deduplication) * [New crossOrigin config option](/blog/next-8#new-crossorigin-config-option) * [Removed inline Javascript](/blog/next-8#removed-inline-javascript) * [Example of API Authentication](/blog/next-8#example-of-api-authentication) [Read More](/blog/next-8) September 19th, 2018    [Next.js 7](/blog/next-7) After 26 canary releases and 3.4 million downloads, we are proud to introduce the production-ready Next.js 7, featuring: * [DX improvements](#dx-improvements): 57% faster bootup, 42% faster re-compilation * [Better error reporting](#better-error-reporting-with-react-error-overlay) with [react-error-overlay](https://www.npmjs.com/package/react-error-overlay) * [Upgraded compilation pipeline](#webpack-4): [Webpack 4](#webpack-4) and [Babel 7](#babel-7) * [Standardized Dynamic Imports](#standardized-dynamic-imports) * [Static CDN support](#static-cdn-support) * [Smaller initial HTML payload](#smaller-initial-html-payload) * [React Context with SSR between App and Pages](#react-context-with-ssr-between-app-and-pages) [Read More](/blog/next-7) June 27th, 2018  [Next.js 6.1](/blog/next-6-1) We are proud today to introduce the production-ready **Next.js 6.1**, featuring: * Increased hot reloading reliability * Codebase improvements * Next.js codemods [Read More](/blog/next-6-1) May 16th, 2018   [Next.js 6 and Nextjs.org](/blog/next-6) We are proud today to introduce the production-ready **Next.js 6**, featuring: * Zero-configuration static exports. No need for `next.config.js` by default * `_app.js`, an extension point that enables page transitions, error boundaries and more * Babel 7 and Fragment syntax `<>` support * Extended integration test suites with a strong focus on security * Flow annotations in the core codebase [Read More](/blog/next-6) March 26th, 2018   [Next.js 5.1: Faster Page Resolution, Environment Config & More](/blog/next-5-1) We are happy to introduce Next.js 5.1, which features support for environment configuration, phases, source maps, and new Next.js plugins. [Read More](/blog/next-5-1) February 5th, 2018   [Next.js 5: Universal Webpack, CSS Imports, Plugins and Zones](/blog/next-5) We are very happy to introduce Next.js 5.0 to the world. It’s available on npm effective immediately. [Read More](/blog/next-5)

https://nextjs.org/

ran **May 23**. Check out the announcements. Vercel Ship 24 [Watch the Keynote](https://vercel.com/ship?utm_source=next_site&utm_medium=web&utm_campaign=vercel_ship&utm_content=next_site_home) Vercel Ship 24 ran **May 23**. Check out the announcements. [Watch the Keynote](https://vercel.com/ship?utm_source=next_site&utm_medium=web&utm_campaign=vercel_ship&utm_content=next_site_home)  The React Framework for the Web =============================== Used by some of the world's largest companies, Next.js enables you to create **high-quality web applications** with the power of React components. [Get Started](/docs)[Learn Next.js](/learn?utm_source=next-site&utm_medium=homepage-cta&utm_campaign=home) ▲ ~ npx create-next-app@latest What's in Next.js? ------------------ Everything you need to build great products on the web. [ Original 1440px 375px Built-in Optimizations Automatic Image, Font, and Script Optimizations for improved UX and Core Web Vitals. ](/docs/app/building-your-application/optimizing/images)[ Data Fetching Make your React component async and await your data. Next.js supports both server and client data fetching. ](/docs/app/building-your-application/data-fetching)[ Server Actions Run server code by calling a function. Skip the API. Then, easily revalidate cached data and update your UI in one network roundtrip. ](/docs/app/building-your-application/data-fetching/forms-and-mutations)[ Advanced Routing & Nested Layouts Create routes using the file system, including support for more advanced routing patterns and UI layouts. ](/docs/app/building-your-application/routing) [ Dynamic HTML Streaming Instantly stream UI from the server, integrated with the App Router and React Suspense. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[ CSS Support Style your application with your favorite tools, including support for CSS Modules, Tailwind CSS, and popular community libraries. ](/docs/app/building-your-application/styling)[ Route Handlers Build API endpoints to securely connect with third-party services for handling auth or listening for webhooks. ](/docs/app/building-your-application/routing/router-handlers)[ Middleware Take control of the incoming request. Use code to define routing and access rules for authentication, experimentation, and internationalization. ](/docs/app/building-your-application/routing/middleware) [  React Server Components Add components without sending additional client-side JavaScript. Built on the latest React features. ](/docs/getting-started/react-essentials)[ Client and Server Rendering Flexible rendering and caching options, including Incremental Static Regeneration (ISR), on a per-page level. ](/docs/app/building-your-application/rendering)[ Next.js 14 The power of full-stack to the frontend. Read the release notes. ](/blog/next-14) [  Built-in Optimizations Automatic Image, Font, and Script Optimizations for improved UX and Core Web Vitals. ](/docs/app/building-your-application/optimizing/images)[  React Server Components Add components without sending additional client-side JavaScript. Built on the latest React features. ](/docs/getting-started/react-essentials)[ Data Fetching Make your React component async and await your data. Next.js supports both server and client data fetching. ](/docs/app/building-your-application/data-fetching)[ Server Actions Run server code by calling a function. Skip the API. Then, easily revalidate cached data and update your UI in one network roundtrip. ](/docs/app/building-your-application/data-fetching/forms-and-mutations)[ Advanced Routing & Nested Layouts Create routes using the file system, including support for more advanced routing patterns and UI layouts. ](/docs/app/building-your-application/routing) [ Dynamic HTML Streaming Instantly stream UI from the server, integrated with the App Router and React Suspense. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[ CSS Support Style your application with your favorite tools, including support for CSS Modules, Tailwind CSS, and popular community libraries. ](/docs/app/building-your-application/styling)[ Route Handlers Build API endpoints to securely connect with third-party services for handling auth or listening for webhooks. ](/docs/app/building-your-application/routing/router-handlers)[ Middleware Take control of the incoming request. Use code to define routing and access rules for authentication, experimentation, and internationalization. ](/docs/app/building-your-application/routing/middleware)[ Client and Server Rendering Flexible rendering and caching options, including Incremental Static Regeneration (ISR), on a per-page level. ](/docs/app/building-your-application/rendering)[ Next.js 14 The power of full-stack to the frontend. Read the release notes. ](/blog/next-14) [  Built-in Optimizations Automatic Image, Font, and Script Optimizations for improved UX and Core Web Vitals. ](/docs/app/building-your-application/optimizing/images)[ Dynamic HTML Streaming Instantly stream UI from the server, integrated with the App Router and React Suspense. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[  React Server Components Add components without sending additional client-side JavaScript. Built on the latest React features. ](/docs/getting-started/react-essentials) [ Data Fetching Make your React component async and await your data. Next.js supports both server and client data fetching. ](/docs/app/building-your-application/data-fetching)[ Server Actions Run server code by calling a function. Skip the API. Then, easily revalidate cached data and update your UI in one network roundtrip. ](/docs/app/building-your-application/data-fetching/forms-and-mutations)[ Advanced Routing & Nested Layouts Create routes using the file system, including support for more advanced routing patterns and UI layouts. ](/docs/app/building-your-application/routing)[ CSS Support Style your application with your favorite tools, including support for CSS Modules, Tailwind CSS, and popular community libraries. ](/docs/app/building-your-application/styling)[ Route Handlers Build API endpoints to securely connect with third-party services for handling auth or listening for webhooks. ](/docs/app/building-your-application/routing/router-handlers)[ Middleware Take control of the incoming request. Use code to define routing and access rules for authentication, experimentation, and internationalization. ](/docs/app/building-your-application/routing/middleware)[ Client and Server Rendering Flexible rendering and caching options, including Incremental Static Regeneration (ISR), on a per-page level. ](/docs/app/building-your-application/rendering) [ Next.js 14 The power of full-stack to the frontend. Read the release notes. ](/blog/next-14) Built on a foundation of fast, production-grade tooling -------------------------------------------------------  Powered By [  ReactThe library for web and native user interfaces. Next.js is built on the latest React features, including Server Components and Actions. ](https://react.dev)[  TurbopackAn incremental bundler optimized for JavaScript and TypeScript, written in Rust , and built into Next.js. ](https://turbo.build)[  Speedy Web CompilerAn extensible Rust  based platform for the next generation of fast developer tools, and can be used for both compilation and minification. ](https://swc.rs) Get started in seconds ---------------------- Deploy Next.js to Vercel StarterEcommerceBlogAIEdge FunctionsEdge ConfigPortfolioSaaSMulti-tenant AppsRealtime AppsDocumentationVirtual EventWeb3 Vercel is a frontend cloud from the creators of Next.js, making it easy to get started with Next.js quickly. Jumpstart your Next.js development with pre-built solutions from Vercel and our community. [Deploy a Template on Vercel](https://vercel.com/templates/next.js?utm_source=next-site&utm_medium=deploy-template-on-vercel-cta&utm_campaign=homepage-new)  Next.js Boilerplate A Next.js app and a Serverless Function API.  Image Gallery Starter An image gallery built on Next.js and Cloudinary.  Next.js Commerce An all-in-one starter kit for high-performance ecommerce sites.  The framework of choice when it matters --------------------------------------- [ Audible * * * ](/showcase)[ Sonos * * * ](/showcase) [ Twitch * * * ](/showcase) [ Notion * * * ](/showcase) [ Today * * * ](/showcase)[ ProductHunt * * * ](/showcase) [ Nike * * * ](/showcase)[ Washington Post * * * ](/showcase) [ Sonos * * * ](/showcase)[ Audible * * * ](/showcase)[ Nike * * * ](/showcase) [ Notion * * * ](/showcase)[ ProductHunt * * * ](/showcase)[ Washington Post * * * ](/showcase) For **performance**, **efficiency** and **developer experience**. Next.js is trusted by some of the biggest names on the web. [View the Next.js Showcase](/showcase) Customer Testimonials --------------------- > ### “With Next.js at the helm of our headless tech stack, our developers can create features with velocity and speed, ultimately enabling users to create whatever, whenever they want to.” Tatiana Mac, Senior Software Engineer > ### “My favorite UX feedback from customers is: "How is the app so fast?" Because we’ve built on Next.js and Vercel since day one, our pages load in an instant, which is important when it comes to mission-critical software.” Fouad Matin, CEO > ### “Next.js has been a game-changer for our agency work and team collaboration. Its powerful features have allowed us to build high-performance websites quickly and efficiently like never before.” Daniel Lopes, Frontend Developer

https://nextjs.org/docs/app/building-your-application/rendering

Menu Using App Router Features available in /app * [Getting Started](/docs/getting-started) * [Installation](/docs/getting-started/installation) * [Project Structure](/docs/getting-started/project-structure) * [Building Your Application](/docs/app/building-your-application) * [Routing](/docs/app/building-your-application/routing) * [Defining Routes](/docs/app/building-your-application/routing/defining-routes) * [Pages and Layouts](/docs/app/building-your-application/routing/pages-and-layouts) * [Linking and Navigating](/docs/app/building-your-application/routing/linking-and-navigating) * [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [Error Handling](/docs/app/building-your-application/routing/error-handling) * [Redirecting](/docs/app/building-your-application/routing/redirecting) * [Route Groups](/docs/app/building-your-application/routing/route-groups) * [Project Organization](/docs/app/building-your-application/routing/colocation) * [Dynamic Routes](/docs/app/building-your-application/routing/dynamic-routes) * [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) * [Intercepting Routes](/docs/app/building-your-application/routing/intercepting-routes) * [Route Handlers](/docs/app/building-your-application/routing/route-handlers) * [Middleware](/docs/app/building-your-application/routing/middleware) * [Internationalization](/docs/app/building-your-application/routing/internationalization) * [Data Fetching](/docs/app/building-your-application/data-fetching) * [Fetching, Caching, and Revalidating](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) * [Server Actions and Mutations](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) * [Data Fetching Patterns and Best Practices](/docs/app/building-your-application/data-fetching/patterns) * [Rendering](/docs/app/building-your-application/rendering) * [Server Components](/docs/app/building-your-application/rendering/server-components) * [Client Components](/docs/app/building-your-application/rendering/client-components) * [Composition Patterns](/docs/app/building-your-application/rendering/composition-patterns) * [Edge and Node.js Runtimes](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) * [Caching](/docs/app/building-your-application/caching) * [Styling](/docs/app/building-your-application/styling) * [CSS Modules](/docs/app/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/app/building-your-application/styling/css-in-js) * [Sass](/docs/app/building-your-application/styling/sass) * [Optimizing](/docs/app/building-your-application/optimizing) * [Images](/docs/app/building-your-application/optimizing/images) * [Videos](/docs/app/building-your-application/optimizing/videos) * 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[ESLint](/docs/app/building-your-application/configuring/eslint) * [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases) * [MDX](/docs/app/building-your-application/configuring/mdx) * [src Directory](/docs/app/building-your-application/configuring/src-directory) * [Draft Mode](/docs/app/building-your-application/configuring/draft-mode) * [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) * [Testing](/docs/app/building-your-application/testing) * [Vitest](/docs/app/building-your-application/testing/vitest) * [Jest](/docs/app/building-your-application/testing/jest) * [Playwright](/docs/app/building-your-application/testing/playwright) * [Cypress](/docs/app/building-your-application/testing/cypress) * [Authentication](/docs/app/building-your-application/authentication) * 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[<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, icon, and apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Fundamentals](#fundamentals) * [Rendering Environments](#rendering-environments) * [Request-Response Lifecycle](#request-response-lifecycle) * [Network Boundary](#network-boundary) * [Building Hybrid Applications](#building-hybrid-applications) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/03-rendering/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[Building Your Application](/docs/app/building-your-application)Rendering Rendering ========= Rendering converts the code you write into user interfaces. React and Next.js allow you to create hybrid web applications where parts of your code can be rendered on the server or the client. This section will help you understand the differences between these rendering environments, strategies, and runtimes. [Fundamentals](#fundamentals) ----------------------------- To start, it's helpful to be familiar with three foundational web concepts: * The [Environments](#rendering-environments) your application code can be executed in: the server and the client. * The [Request-Response Lifecycle](#request-response-lifecycle) that's initiated when a user visits or interacts with your application. * The [Network Boundary](#network-boundary) that separates server and client code. ### [Rendering Environments](#rendering-environments) There are two environments where web applications can be rendered: the client and the server.  * The **client** refers to the browser on a user's device that sends a request to a server for your application code. It then turns the response from the server into a user interface. * The **server** refers to the computer in a data center that stores your application code, receives requests from a client, and sends back an appropriate response. Historically, developers had to use different languages (e.g. JavaScript, PHP) and frameworks when writing code for the server and the client. With React, developers can use the **same language** (JavaScript), and the **same framework** (e.g. Next.js or your framework of choice). This flexibility allows you to seamlessly write code for both environments without context switching. However, each environment has its own set of capabilities and constraints. Therefore, the code you write for the server and the client is not always the same. There are certain operations (e.g. data fetching or managing user state) that are better suited for one environment over the other. Understanding these differences is key to effectively using React and Next.js. We'll cover the differences and use cases in more detail on the [Server](/docs/app/building-your-application/rendering/server-components) and [Client](/docs/app/building-your-application/rendering/client-components) Components pages, for now, let's continue building on our foundation. ### [Request-Response Lifecycle](#request-response-lifecycle) Broadly speaking, all websites follow the same **Request-Response Lifecycle**: 1. **User Action:** The user interacts with a web application. This could be clicking a link, submitting a form, or typing a URL directly into the browser's address bar. 2. **HTTP Request:** The client sends an [HTTP](https://developer.mozilla.org/docs/Web/HTTP) request to the server that contains necessary information about what resources are being requested, what method is being used (e.g. `GET`, `POST`), and additional data if necessary. 3. **Server:** The server processes the request and responds with the appropriate resources. This process may take a couple of steps like routing, fetching data, etc. 4. **HTTP Response:** After processing the request, the server sends an HTTP response back to the client. This response contains a status code (which tells the client whether the request was successful or not) and requested resources (e.g. HTML, CSS, JavaScript, static assets, etc). 5. **Client:** The client parses the resources to render the user interface. 6. **User Action:** Once the user interface is rendered, the user can interact with it, and the whole process starts again. A major part of building a hybrid web application is deciding how to split the work in the lifecycle, and where to place the Network Boundary. ### [Network Boundary](#network-boundary) In web development, the **Network Boundary** is a conceptual line that separates the different environments. For example, the client and the server, or the server and the data store. In React, you choose where to place the client-server network boundary wherever it makes the most sense. Behind the scenes, the work is split into two parts: the **client module graph** and the **server module graph**. The server module graph contains all the components that are rendered on the server, and the client module graph contains all components that are rendered on the client. It may be helpful to think about module graphs as a visual representation of how files in your application depend on each other. You can use the React `"use client"` convention to define the boundary. There's also a `"use server"` convention, which tells React to do some computational work on the server. [Building Hybrid Applications](#building-hybrid-applications) ------------------------------------------------------------- When working in these environments, it's helpful to think of the flow of the code in your application as **unidirectional**. In other words, during a response, your application code flows in one direction: from the server to the client. If you need to access the server from the client, you send a **new** request to the server rather than re-use the same request. This makes it easier to understand where to render your components and where to place the Network Boundary. In practice, this model encourages developers to think about what they want to execute on the server first, before sending the result to the client and making the application interactive. This concept will become clearer when we look at how you can [interleave client and server components](/docs/app/building-your-application/rendering/composition-patterns) in the same component tree. [ ### Server Components Learn how you can use React Server Components to render parts of your application on the server. ](/docs/app/building-your-application/rendering/server-components)[ ### Client Components Learn how to use Client Components to render parts of your application on the client. ](/docs/app/building-your-application/rendering/client-components)[ ### Composition Patterns Recommended patterns for using Server and Client Components. ](/docs/app/building-your-application/rendering/composition-patterns)[ ### Edge and Node.js Runtimes Learn about the switchable runtimes (Edge and Node.js) in Next.js. ](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) [Previous Data Fetching Patterns and Best Practices ](/docs/app/building-your-application/data-fetching/patterns) [Next Server Components ](/docs/app/building-your-application/rendering/server-components) Was this helpful? supported. Send

https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating

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[generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Fetching Data on the Server with fetch](#fetching-data-on-the-server-with-fetch) * [Caching Data](#caching-data) * [Revalidating Data](#revalidating-data) * [Time-based Revalidation](#time-based-revalidation) * [On-demand Revalidation](#on-demand-revalidation) * [Error handling and revalidation](#error-handling-and-revalidation) * [Opting out of Data Caching](#opting-out-of-data-caching) * [Individual fetch Requests](#individual-fetch-requests) * [Multiple fetch Requests](#multiple-fetch-requests) * [Fetching data on the Server with third-party libraries](#fetching-data-on-the-server-with-third-party-libraries) * [Example](#example) * [Fetching Data on the Client with Route Handlers](#fetching-data-on-the-client-with-route-handlers) * [Fetching Data on the Client with third-party libraries](#fetching-data-on-the-client-with-third-party-libraries) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/02-data-fetching/01-fetching-caching-and-revalidating.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Data Fetching](/docs/app/building-your-application/data-fetching)Fetching, Caching, and Revalidating Data Fetching, Caching, and Revalidating ======================================== Data fetching is a core part of any application. This page goes through how you can fetch, cache, and revalidate data in React and Next.js. There are four ways you can fetch data: 1. [On the server, with `fetch`](#fetching-data-on-the-server-with-fetch) 2. [On the server, with third-party libraries](#fetching-data-on-the-server-with-third-party-libraries) 3. [On the client, via a Route Handler](#fetching-data-on-the-client-with-route-handlers) 4. [On the client, with third-party libraries](#fetching-data-on-the-client-with-route-handlers). [Fetching Data on the Server with `fetch`](#fetching-data-on-the-server-with-fetch) ----------------------------------------------------------------------------------- Next.js extends the native [`fetch` Web API](https://developer.mozilla.org/docs/Web/API/Fetch_API) to allow you to configure the [caching](#caching-data) and [revalidating](#revalidating-data) behavior for each fetch request on the server. React extends `fetch` to automatically [memoize](/docs/app/building-your-application/data-fetching/patterns#fetching-data-where-its-needed) fetch requests while rendering a React component tree. You can use `fetch` with `async`/`await` in Server Components, in [Route Handlers](/docs/app/building-your-application/routing/route-handlers), and in [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). For example: app/page.tsx TypeScript JavaScriptTypeScript async function getData() { const res = await fetch('https://api.example.com/...') // The return value is *not* serialized // You can return Date, Map, Set, etc. if (!res.ok) { // This will activate the closest `error.js` Error Boundary throw new Error('Failed to fetch data') } return res.json() } export default async function Page() { const data = await getData() return <main></main> } > **Good to know**: > > * Next.js provides helpful functions you may need when fetching data in Server Components such as [`cookies`](/docs/app/api-reference/functions/cookies) and [`headers`](/docs/app/api-reference/functions/headers). These will cause the route to be dynamically rendered as they rely on request time information. > * In Route handlers, `fetch` requests are not memoized as Route Handlers are not part of the React component tree. > * In [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations), `fetch` requests are not cached (defaults `cache: no-store`). > * To use `async`/`await` in a Server Component with TypeScript, you'll need to use TypeScript `5.1.3` or higher and `@types/react` `18.2.8` or higher. ### [Caching Data](#caching-data) Caching stores data so it doesn't need to be re-fetched from your data source on every request. By default, Next.js automatically caches the returned values of `fetch` in the [Data Cache](/docs/app/building-your-application/caching#data-cache) on the server. This means that the data can be fetched at build time or request time, cached, and reused on each data request. // 'force-cache' is the default, and can be omitted fetch('https://...', { cache: 'force-cache' }) However, there are exceptions, `fetch` requests are not cached when: * Used inside a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). * Used inside a [Route Handler](/docs/app/building-your-application/routing/route-handlers) that uses the `POST` method. > **What is the Data Cache?** > > The Data Cache is a persistent [HTTP cache](https://developer.mozilla.org/docs/Web/HTTP/Caching). Depending on your platform, the cache can scale automatically and be [shared across multiple regions](https://vercel.com/docs/infrastructure/data-cache). > > Learn more about the [Data Cache](/docs/app/building-your-application/caching#data-cache). ### [Revalidating Data](#revalidating-data) Revalidation is the process of purging the Data Cache and re-fetching the latest data. This is useful when your data changes and you want to ensure you show the latest information. Cached data can be revalidated in two ways: * **Time-based revalidation**: Automatically revalidate data after a certain amount of time has passed. This is useful for data that changes infrequently and freshness is not as critical. * **On-demand revalidation**: Manually revalidate data based on an event (e.g. form submission). On-demand revalidation can use a tag-based or path-based approach to revalidate groups of data at once. This is useful when you want to ensure the latest data is shown as soon as possible (e.g. when content from your headless CMS is updated). #### [Time-based Revalidation](#time-based-revalidation) To revalidate data at a timed interval, you can use the `next.revalidate` option of `fetch` to set the cache lifetime of a resource (in seconds). fetch('https://...', { next: { revalidate: 3600 } }) Alternatively, to revalidate all `fetch` requests in a route segment, you can use the [Segment Config Options](/docs/app/api-reference/file-conventions/route-segment-config). layout.js | page.js export const revalidate = 3600 // revalidate at most every hour If you have multiple fetch requests in a statically rendered route, and each has a different revalidation frequency. The lowest time will be used for all requests. For dynamically rendered routes, each `fetch` request will be revalidated independently. Learn more about [time-based revalidation](/docs/app/building-your-application/caching#time-based-revalidation). #### [On-demand Revalidation](#on-demand-revalidation) Data can be revalidated on-demand by path ([`revalidatePath`](/docs/app/api-reference/functions/revalidatePath)) or by cache tag ([`revalidateTag`](/docs/app/api-reference/functions/revalidateTag)) inside a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) or [Route Handler](/docs/app/building-your-application/routing/route-handlers). Next.js has a cache tagging system for invalidating `fetch` requests across routes. 1. When using `fetch`, you have the option to tag cache entries with one or more tags. 2. Then, you can call `revalidateTag` to revalidate all entries associated with that tag. For example, the following `fetch` request adds the cache tag `collection`: app/page.tsx TypeScript JavaScriptTypeScript export default async function Page() { const res = await fetch('https://...', { next: { tags: ['collection'] } }) const data = await res.json() // ... } You can then revalidate this `fetch` call tagged with `collection` by calling `revalidateTag` in a Server Action: app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { revalidateTag } from 'next/cache' export default async function action() { revalidateTag('collection') } Learn more about [on-demand revalidation](/docs/app/building-your-application/caching#on-demand-revalidation). #### [Error handling and revalidation](#error-handling-and-revalidation) If an error is thrown while attempting to revalidate data, the last successfully generated data will continue to be served from the cache. On the next subsequent request, Next.js will retry revalidating the data. ### [Opting out of Data Caching](#opting-out-of-data-caching) `fetch` requests are **not** cached if: * The `cache: 'no-store'` is added to `fetch` requests. * The `revalidate: 0` option is added to individual `fetch` requests. * The `fetch` request is inside a Router Handler that uses the `POST` method. * The `fetch` request comes after the usage of `headers` or `cookies`. * The `const dynamic = 'force-dynamic'` route segment option is used. * The `fetchCache` route segment option is configured to skip cache by default. * The `fetch` request uses `Authorization` or `Cookie` headers and there's an uncached request above it in the component tree. #### [Individual `fetch` Requests](#individual-fetch-requests) To opt out of caching for individual `fetch` requests, you can set the `cache` option in `fetch` to `'no-store'`. This will fetch data dynamically, on every request. layout.js | page.js fetch('https://...', { cache: 'no-store' }) View all the available `cache` options in the [`fetch` API reference](/docs/app/api-reference/functions/fetch). #### [Multiple `fetch` Requests](#multiple-fetch-requests) If you have multiple `fetch` requests in a route segment (e.g. a Layout or Page), you can configure the caching behavior of all data requests in the segment using the [Segment Config Options](/docs/app/api-reference/file-conventions/route-segment-config). However, we recommend configuring the caching behavior of each `fetch` request individually. This gives you more granular control over the caching behavior. [Fetching data on the Server with third-party libraries](#fetching-data-on-the-server-with-third-party-libraries) ----------------------------------------------------------------------------------------------------------------- In cases where you're using a third-party library that doesn't support or expose `fetch` (for example, a database, CMS, or ORM client), you can configure the caching and revalidating behavior of those requests using the [Route Segment Config Option](/docs/app/api-reference/file-conventions/route-segment-config) and React's `cache` function. Whether the data is cached or not will depend on whether the route segment is [statically or dynamically rendered](/docs/app/building-your-application/rendering/server-components#server-rendering-strategies). If the segment is static (default), the output of the request will be cached and revalidated as part of the route segment. If the segment is dynamic, the output of the request will _not_ be cached and will be re-fetched on every request when the segment is rendered. You can also use the experimental [`unstable_cache` API](/docs/app/api-reference/functions/unstable_cache). ### [Example](#example) In the example below: * The React `cache` function is used to [memoize](/docs/app/building-your-application/caching#request-memoization) data requests. * The `revalidate` option is set to `3600` in the Layout and Page segments, meaning the data will be cached and revalidated at most every hour. app/utils.ts TypeScript JavaScriptTypeScript import { cache } from 'react' export const getItem = cache(async (id: string) => { const item = await db.item.findUnique({ id }) return item }) Although the `getItem` function is called twice, only one query will be made to the database. app/item/\[id\]/layout.tsx TypeScript JavaScriptTypeScript import { getItem } from '@/utils/get-item' export const revalidate = 3600 // revalidate the data at most every hour export default async function Layout({ params: { id }, }: { params: { id: string } }) { const item = await getItem(id) // ... } app/item/\[id\]/page.tsx TypeScript JavaScriptTypeScript import { getItem } from '@/utils/get-item' export const revalidate = 3600 // revalidate the data at most every hour export default async function Page({ params: { id }, }: { params: { id: string } }) { const item = await getItem(id) // ... } [Fetching Data on the Client with Route Handlers](#fetching-data-on-the-client-with-route-handlers) --------------------------------------------------------------------------------------------------- If you need to fetch data in a client component, you can call a [Route Handler](/docs/app/building-your-application/routing/route-handlers) from the client. Route Handlers execute on the server and return the data to the client. This is useful when you don't want to expose sensitive information to the client, such as API tokens. See the [Route Handler](/docs/app/building-your-application/routing/route-handlers) documentation for examples. > **Server Components and Route Handlers** > > Since Server Components render on the server, you don't need to call a Route Handler from a Server Component to fetch data. Instead, you can fetch the data directly inside the Server Component. [Fetching Data on the Client with third-party libraries](#fetching-data-on-the-client-with-third-party-libraries) ----------------------------------------------------------------------------------------------------------------- You can also fetch data on the client using a third-party library such as [SWR](https://swr.vercel.app/) or [TanStack Query](https://tanstack.com/query/latest). These libraries provide their own APIs for memoizing requests, caching, revalidating, and mutating data. > **Future APIs**: > > `use` is a React function that **accepts and handles a promise** returned by a function. Wrapping `fetch` in `use` is currently **not** recommended in Client Components and may trigger multiple re-renders. Learn more about `use` in the [React docs](https://react.dev/reference/react/use). [Previous Data Fetching ](/docs/app/building-your-application/data-fetching) [Next Server Actions and Mutations ](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Benefits of Server Rendering](#benefits-of-server-rendering) * [Using Server Components in Next.js](#using-server-components-in-nextjs) * [How are Server Components rendered?](#how-are-server-components-rendered) * [Server Rendering Strategies](#server-rendering-strategies) * [Static Rendering (Default)](#static-rendering-default) * [Dynamic Rendering](#dynamic-rendering) * [Switching to Dynamic Rendering](#switching-to-dynamic-rendering) * [Dynamic Functions](#dynamic-functions) * [Streaming](#streaming) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/03-rendering/01-server-components.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Rendering](/docs/app/building-your-application/rendering)Server Components Server Components ================= React Server Components allow you to write UI that can be rendered and optionally cached on the server. In Next.js, the rendering work is further split by route segments to enable streaming and partial rendering, and there are three different server rendering strategies: * [Static Rendering](#static-rendering-default) * [Dynamic Rendering](#dynamic-rendering) * [Streaming](#streaming) This page will go through how Server Components work, when you might use them, and the different server rendering strategies. [Benefits of Server Rendering](#benefits-of-server-rendering) ------------------------------------------------------------- There are a couple of benefits to doing the rendering work on the server, including: * **Data Fetching**: Server Components allow you to move data fetching to the server, closer to your data source. This can improve performance by reducing time it takes to fetch data needed for rendering, and the number of requests the client needs to make. * **Security**: Server Components allow you to keep sensitive data and logic on the server, such as tokens and API keys, without the risk of exposing them to the client. * **Caching**: By rendering on the server, the result can be cached and reused on subsequent requests and across users. This can improve performance and reduce cost by reducing the amount of rendering and data fetching done on each request. * **Performance**: Server Components give you additional tools to optimize performance from the baseline. For example, if you start with an app composed of entirely Client Components, moving non-interactive pieces of your UI to Server Components can reduce the amount of client-side JavaScript needed. This is beneficial for users with slower internet or less powerful devices, as the browser has less client-side JavaScript to download, parse, and execute. * **Initial Page Load and [First Contentful Paint (FCP)](https://web.dev/fcp/)**: On the server, we can generate HTML to allow users to view the page immediately, without waiting for the client to download, parse and execute the JavaScript needed to render the page. * **Search Engine Optimization and Social Network Shareability**: The rendered HTML can be used by search engine bots to index your pages and social network bots to generate social card previews for your pages. * **Streaming**: Server Components allow you to split the rendering work into chunks and stream them to the client as they become ready. This allows the user to see parts of the page earlier without having to wait for the entire page to be rendered on the server. [Using Server Components in Next.js](#using-server-components-in-nextjs) ------------------------------------------------------------------------ By default, Next.js uses Server Components. This allows you to automatically implement server rendering with no additional configuration, and you can opt into using Client Components when needed, see [Client Components](/docs/app/building-your-application/rendering/client-components). [How are Server Components rendered?](#how-are-server-components-rendered) -------------------------------------------------------------------------- On the server, Next.js uses React's APIs to orchestrate rendering. The rendering work is split into chunks: by individual route segments and [Suspense Boundaries](https://react.dev/reference/react/Suspense). Each chunk is rendered in two steps: 1. React renders Server Components into a special data format called the **React Server Component Payload (RSC Payload)**. 2. Next.js uses the RSC Payload and Client Component JavaScript instructions to render **HTML** on the server. Then, on the client: 1. The HTML is used to immediately show a fast non-interactive preview of the route - this is for the initial page load only. 2. The React Server Components Payload is used to reconcile the Client and Server Component trees, and update the DOM. 3. The JavaScript instructions are used to [hydrate](https://react.dev/reference/react-dom/client/hydrateRoot) Client Components and make the application interactive. > **What is the React Server Component Payload (RSC)?** > > The RSC Payload is a compact binary representation of the rendered React Server Components tree. It's used by React on the client to update the browser's DOM. The RSC Payload contains: > > * The rendered result of Server Components > * Placeholders for where Client Components should be rendered and references to their JavaScript files > * Any props passed from a Server Component to a Client Component [Server Rendering Strategies](#server-rendering-strategies) ----------------------------------------------------------- There are three subsets of server rendering: Static, Dynamic, and Streaming. ### [Static Rendering (Default)](#static-rendering-default) With Static Rendering, routes are rendered at **build time**, or in the background after [data revalidation](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#revalidating-data). The result is cached and can be pushed to a [Content Delivery Network (CDN)](https://developer.mozilla.org/docs/Glossary/CDN). This optimization allows you to share the result of the rendering work between users and server requests. Static rendering is useful when a route has data that is not personalized to the user and can be known at build time, such as a static blog post or a product page. ### [Dynamic Rendering](#dynamic-rendering) With Dynamic Rendering, routes are rendered for each user at **request time**. Dynamic rendering is useful when a route has data that is personalized to the user or has information that can only be known at request time, such as cookies or the URL's search params. > **Dynamic Routes with Cached Data** > > In most websites, routes are not fully static or fully dynamic - it's a spectrum. For example, you can have an e-commerce page that uses cached product data that's revalidated at an interval, but also has uncached, personalized customer data. > > In Next.js, you can have dynamically rendered routes that have both cached and uncached data. This is because the RSC Payload and data are cached separately. This allows you to opt into dynamic rendering without worrying about the performance impact of fetching all the data at request time. > > Learn more about the [full-route cache](/docs/app/building-your-application/caching#full-route-cache) and [Data Cache](/docs/app/building-your-application/caching#data-cache). #### [Switching to Dynamic Rendering](#switching-to-dynamic-rendering) During rendering, if a [dynamic function](#dynamic-functions) or [uncached data request](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#opting-out-of-data-caching) is discovered, Next.js will switch to dynamically rendering the whole route. This table summarizes how dynamic functions and data caching affect whether a route is statically or dynamically rendered: Dynamic Functions Data Route No Cached Statically Rendered Yes Cached Dynamically Rendered No Not Cached Dynamically Rendered Yes Not Cached Dynamically Rendered In the table above, for a route to be fully static, all data must be cached. However, you can have a dynamically rendered route that uses both cached and uncached data fetches. As a developer, you do not need to choose between static and dynamic rendering as Next.js will automatically choose the best rendering strategy for each route based on the features and APIs used. Instead, you choose when to [cache or revalidate specific data](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating), and you may choose to [stream](#streaming) parts of your UI. #### [Dynamic Functions](#dynamic-functions) Dynamic functions rely on information that can only be known at request time such as a user's cookies, current requests headers, or the URL's search params. In Next.js, these dynamic functions are: * **[`cookies()`](/docs/app/api-reference/functions/cookies) and [`headers()`](/docs/app/api-reference/functions/headers)**: Using these in a Server Component will opt the whole route into dynamic rendering at request time. * **[`searchParams`](/docs/app/api-reference/file-conventions/page#searchparams-optional)**: Using the `searchParams` prop on a [Page](/docs/app/api-reference/file-conventions/page) will opt the page into dynamic rendering at request time. Using any of these functions will opt the whole route into dynamic rendering at request time. ### [Streaming](#streaming)  Streaming enables you to progressively render UI from the server. Work is split into chunks and streamed to the client as it becomes ready. This allows the user to see parts of the page immediately, before the entire content has finished rendering.  Streaming is built into the Next.js App Router by default. This helps improve both the initial page loading performance, as well as UI that depends on slower data fetches that would block rendering the whole route. For example, reviews on a product page. You can start streaming route segments using `loading.js` and UI components with [React Suspense](/docs/app/building-your-application/routing/loading-ui-and-streaming). See the [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) section for more information. Next Steps ---------- Learn how Next.js caches data and the result of static rendering. [ App Router Building Your Application ### Caching An overview of caching mechanisms in Next.js. ](/docs/app/building-your-application/caching) [Previous Rendering ](/docs/app/building-your-application/rendering) [Next Client Components ](/docs/app/building-your-application/rendering/client-components) Was this helpful? supported. Send

https://nextjs.org/docs/app/building-your-application/data-fetching/server-actions-and-mutations

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Convention](#convention) * [Server Components](#server-components) * [Client Components](#client-components) * [Behavior](#behavior) * [Examples](#examples) * [Forms](#forms) * [Passing Additional Arguments](#passing-additional-arguments) * [Pending states](#pending-states) * [Server-side validation and error handling](#server-side-validation-and-error-handling) * [Optimistic updates](#optimistic-updates) * [Nested elements](#nested-elements) * [Programmatic form submission](#programmatic-form-submission) * [Non-form Elements](#non-form-elements) * [Event Handlers](#event-handlers) * [useEffect](#useeffect) * [Error Handling](#error-handling) * [Revalidating data](#revalidating-data) * [Redirecting](#redirecting) * [Cookies](#cookies) * [Security](#security) * [Authentication and authorization](#authentication-and-authorization) * [Closures and encryption](#closures-and-encryption) * [Overwriting encryption keys (advanced)](#overwriting-encryption-keys-advanced) * [Allowed origins (advanced)](#allowed-origins-advanced) * [Additional resources](#additional-resources) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/02-data-fetching/02-server-actions-and-mutations.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Data Fetching](/docs/app/building-your-application/data-fetching)Server Actions and Mutations Server Actions and Mutations ============================ Server Actions are **asynchronous functions** that are executed on the server. They can be used in Server and Client Components to handle form submissions and data mutations in Next.js applications. > **🎥 Watch:** Learn more about forms and mutations with Server Actions → [YouTube (10 minutes)](https://youtu.be/dDpZfOQBMaU?si=cJZHlUu_jFhCzHUg). [Convention](#convention) ------------------------- A Server Action can be defined with the React [`"use server"`](https://react.dev/reference/react/use-server) directive. You can place the directive at the top of an `async` function to mark the function as a Server Action, or at the top of a separate file to mark all exports of that file as Server Actions. ### [Server Components](#server-components) Server Components can use the inline function level or module level `"use server"` directive. To inline a Server Action, add `"use server"` to the top of the function body: app/page.tsx TypeScript JavaScriptTypeScript // Server Component export default function Page() { // Server Action async function create() { 'use server' // ... } return ( // ... ) } ### [Client Components](#client-components) Client Components can only import actions that use the module-level `"use server"` directive. To call a Server Action in a Client Component, create a new file and add the `"use server"` directive at the top of it. All functions within the file will be marked as Server Actions that can be reused in both Client and Server Components: app/actions.ts TypeScript JavaScriptTypeScript 'use server' export async function create() { // ... } app/ui/button.tsx TypeScript JavaScriptTypeScript import { create } from '@/app/actions' export function Button() { return ( // ... ) } You can also pass a Server Action to a Client Component as a prop: <ClientComponent updateItem={updateItem} /> app/client-component.jsx 'use client' export default function ClientComponent({ updateItem }) { return <form action={updateItem}>{/* ... */}</form> } [Behavior](#behavior) --------------------- * Server actions can be invoked using the `action` attribute in a [`<form>` element](#forms): * Server Components support progressive enhancement by default, meaning the form will be submitted even if JavaScript hasn't loaded yet or is disabled. * In Client Components, forms invoking Server Actions will queue submissions if JavaScript isn't loaded yet, prioritizing client hydration. * After hydration, the browser does not refresh on form submission. * Server Actions are not limited to `<form>` and can be invoked from event handlers, `useEffect`, third-party libraries, and other form elements like `<button>`. * Server Actions integrate with the Next.js [caching and revalidation](/docs/app/building-your-application/caching) architecture. When an action is invoked, Next.js can return both the updated UI and new data in a single server roundtrip. * Behind the scenes, actions use the `POST` method, and only this HTTP method can invoke them. * The arguments and return value of Server Actions must be serializable by React. See the React docs for a list of [serializable arguments and values](https://react.dev/reference/react/use-server#serializable-parameters-and-return-values). * Server Actions are functions. This means they can be reused anywhere in your application. * Server Actions inherit the [runtime](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) from the page or layout they are used on. * Server Actions inherit the [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) from the page or layout they are used on, including fields like `maxDuration`. [Examples](#examples) --------------------- ### [Forms](#forms) React extends the HTML [`<form>`](https://developer.mozilla.org/docs/Web/HTML/Element/form) element to allow Server Actions to be invoked with the `action` prop. When invoked in a form, the action automatically receives the [`FormData`](https://developer.mozilla.org/docs/Web/API/FormData/FormData) object. You don't need to use React `useState` to manage fields, instead, you can extract the data using the native [`FormData` methods](https://developer.mozilla.org/en-US/docs/Web/API/FormData#instance_methods): app/invoices/page.tsx TypeScript JavaScriptTypeScript export default function Page() { async function createInvoice(formData: FormData) { 'use server' const rawFormData = { customerId: formData.get('customerId'), amount: formData.get('amount'), status: formData.get('status'), } // mutate data // revalidate cache } return <form action={createInvoice}>...</form> } > **Good to know:** > > * Example: [Form with Loading & Error States](https://github.com/vercel/next.js/tree/canary/examples/next-forms) > * When working with forms that have many fields, you may want to consider using the [`entries()`](https://developer.mozilla.org/en-US/docs/Web/API/FormData/entries) method with JavaScript's [`Object.fromEntries()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries). For example: `const rawFormData = Object.fromEntries(formData)`. One thing to note is that the `formData` will include additional `$ACTION_` properties. > * See [React `<form>` documentation](https://react.dev/reference/react-dom/components/form#handle-form-submission-with-a-server-action) to learn more. #### [Passing Additional Arguments](#passing-additional-arguments) You can pass additional arguments to a Server Action using the JavaScript `bind` method. app/client-component.tsx TypeScript JavaScriptTypeScript 'use client' import { updateUser } from './actions' export function UserProfile({ userId }: { userId: string }) { const updateUserWithId = updateUser.bind(null, userId) return ( <form action={updateUserWithId}> <input type="text" name="name" /> <button type="submit">Update User Name</button> </form> ) } The Server Action will receive the `userId` argument, in addition to the form data: app/actions.js 'use server' export async function updateUser(userId, formData) { // ... } > **Good to know**: > > * An alternative is to pass arguments as hidden input fields in the form (e.g. `<input type="hidden" name="userId" value={userId} />`). However, the value will be part of the rendered HTML and will not be encoded. > * `.bind` works in both Server and Client Components. It also supports progressive enhancement. #### [Pending states](#pending-states) You can use the React [`useFormStatus`](https://react.dev/reference/react-dom/hooks/useFormStatus) hook to show a pending state while the form is being submitted. * `useFormStatus` returns the status for a specific `<form>`, so it **must be defined as a child of the `<form>` element**. * `useFormStatus` is a React hook and therefore must be used in a Client Component. app/submit-button.tsx TypeScript JavaScriptTypeScript 'use client' import { useFormStatus } from 'react-dom' export function SubmitButton() { const { pending } = useFormStatus() return ( <button type="submit" disabled={pending}> Add </button> ) } `<SubmitButton />` can then be nested in any form: app/page.tsx TypeScript JavaScriptTypeScript import { SubmitButton } from '@/app/submit-button' import { createItem } from '@/app/actions' // Server Component export default async function Home() { return ( <form action={createItem}> <input type="text" name="field-name" /> <SubmitButton /> </form> ) } #### [Server-side validation and error handling](#server-side-validation-and-error-handling) We recommend using HTML validation like `required` and `type="email"` for basic client-side form validation. For more advanced server-side validation, you can use a library like [zod](https://zod.dev/) to validate the form fields before mutating the data: app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { z } from 'zod' const schema = z.object({ email: z.string({ invalid_type_error: 'Invalid Email', }), }) export default async function createUser(formData: FormData) { const validatedFields = schema.safeParse({ email: formData.get('email'), }) // Return early if the form data is invalid if (!validatedFields.success) { return { errors: validatedFields.error.flatten().fieldErrors, } } // Mutate data } Once the fields have been validated on the server, you can return a serializable object in your action and use the React [`useFormState`](https://react.dev/reference/react-dom/hooks/useFormState) hook to show a message to the user. * By passing the action to `useFormState`, the action's function signature changes to receive a new `prevState` or `initialState` parameter as its first argument. * `useFormState` is a React hook and therefore must be used in a Client Component. app/actions.ts TypeScript JavaScriptTypeScript 'use server' export async function createUser(prevState: any, formData: FormData) { // ... return { message: 'Please enter a valid email', } } Then, you can pass your action to the `useFormState` hook and use the returned `state` to display an error message. app/ui/signup.tsx TypeScript JavaScriptTypeScript 'use client' import { useFormState } from 'react-dom' import { createUser } from '@/app/actions' const initialState = { message: '', } export function Signup() { const [state, formAction] = useFormState(createUser, initialState) return ( <form action={formAction}> <label htmlFor="email">Email</label> <input type="text" id="email" name="email" required /> {/* ... */} <p aria-live="polite" className="sr-only"> {state?.message} </p> <button>Sign up</button> </form> ) } > **Good to know:** > > * Before mutating data, you should always ensure a user is also authorized to perform the action. See [Authentication and Authorization](#authentication-and-authorization). #### [Optimistic updates](#optimistic-updates) You can use the React [`useOptimistic`](https://react.dev/reference/react/useOptimistic) hook to optimistically update the UI before the Server Action finishes, rather than waiting for the response: app/page.tsx TypeScript JavaScriptTypeScript 'use client' import { useOptimistic } from 'react' import { send } from './actions' type Message = { message: string } export function Thread({ messages }: { messages: Message[] }) { const [optimisticMessages, addOptimisticMessage] = useOptimistic< Message[], string >(messages, (state, newMessage) => [...state, { message: newMessage }]) return ( <div> {optimisticMessages.map((m, k) => ( <div key={k}>{m.message}</div> ))} <form action={async (formData: FormData) => { const message = formData.get('message') addOptimisticMessage(message) await send(message) }} > <input type="text" name="message" /> <button type="submit">Send</button> </form> </div> ) } #### [Nested elements](#nested-elements) You can invoke a Server Action in elements nested inside `<form>` such as `<button>`, `<input type="submit">`, and `<input type="image">`. These elements accept the `formAction` prop or [event handlers](#event-handlers). This is useful in cases where you want to call multiple server actions within a form. For example, you can create a specific `<button>` element for saving a post draft in addition to publishing it. See the [React `<form>` docs](https://react.dev/reference/react-dom/components/form#handling-multiple-submission-types) for more information. #### [Programmatic form submission](#programmatic-form-submission) You can trigger a form submission using the [`requestSubmit()`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/requestSubmit) method. For example, when the user presses `⌘` + `Enter`, you can listen for the `onKeyDown` event: app/entry.tsx TypeScript JavaScriptTypeScript 'use client' export function Entry() { const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => { if ( (e.ctrlKey || e.metaKey) && (e.key === 'Enter' || e.key === 'NumpadEnter') ) { e.preventDefault() e.currentTarget.form?.requestSubmit() } } return ( <div> <textarea name="entry" rows={20} required onKeyDown={handleKeyDown} /> </div> ) } This will trigger the submission of the nearest `<form>` ancestor, which will invoke the Server Action. ### [Non-form Elements](#non-form-elements) While it's common to use Server Actions within `<form>` elements, they can also be invoked from other parts of your code such as event handlers and `useEffect`. #### [Event Handlers](#event-handlers) You can invoke a Server Action from event handlers such as `onClick`. For example, to increment a like count: app/like-button.tsx TypeScript JavaScriptTypeScript 'use client' import { incrementLike } from './actions' import { useState } from 'react' export default function LikeButton({ initialLikes }: { initialLikes: number }) { const [likes, setLikes] = useState(initialLikes) return ( <> <p>Total Likes: {likes}</p> <button onClick={async () => { const updatedLikes = await incrementLike() setLikes(updatedLikes) }} > Like </button> </> ) } To improve the user experience, we recommend using other React APIs like [`useOptimistic`](https://react.dev/reference/react/useOptimistic) and [`useTransition`](https://react.dev/reference/react/useTransition) to update the UI before the Server Action finishes executing on the server, or to show a pending state. You can also add event handlers to form elements, for example, to save a form field `onChange`: app/ui/edit-post.tsx 'use client' import { publishPost, saveDraft } from './actions' export default function EditPost() { return ( <form action={publishPost}> <textarea name="content" onChange={async (e) => { await saveDraft(e.target.value) }} /> <button type="submit">Publish</button> </form> ) } For cases like this, where multiple events might be fired in quick succession, we recommend **debouncing** to prevent unnecessary Server Action invocations. #### [`useEffect`](#useeffect) You can use the React [`useEffect`](https://react.dev/reference/react/useEffect) hook to invoke a Server Action when the component mounts or a dependency changes. This is useful for mutations that depend on global events or need to be triggered automatically. For example, `onKeyDown` for app shortcuts, an intersection observer hook for infinite scrolling, or when the component mounts to update a view count: app/view-count.tsx TypeScript JavaScriptTypeScript 'use client' import { incrementViews } from './actions' import { useState, useEffect } from 'react' export default function ViewCount({ initialViews }: { initialViews: number }) { const [views, setViews] = useState(initialViews) useEffect(() => { const updateViews = async () => { const updatedViews = await incrementViews() setViews(updatedViews) } updateViews() }, []) return <p>Total Views: {views}</p> } Remember to consider the [behavior and caveats](https://react.dev/reference/react/useEffect#caveats) of `useEffect`. ### [Error Handling](#error-handling) When an error is thrown, it'll be caught by the nearest [`error.js`](/docs/app/building-your-application/routing/error-handling) or `<Suspense>` boundary on the client. We recommend using `try/catch` to return errors to be handled by your UI. For example, your Server Action might handle errors from creating a new item by returning a message: app/actions.ts TypeScript JavaScriptTypeScript 'use server' export async function createTodo(prevState: any, formData: FormData) { try { // Mutate data } catch (e) { throw new Error('Failed to create task') } } > **Good to know:** > > * Aside from throwing the error, you can also return an object to be handled by `useFormState`. See [Server-side validation and error handling](#server-side-validation-and-error-handling). ### [Revalidating data](#revalidating-data) You can revalidate the [Next.js Cache](/docs/app/building-your-application/caching) inside your Server Actions with the [`revalidatePath`](/docs/app/api-reference/functions/revalidatePath) API: app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { revalidatePath } from 'next/cache' export async function createPost() { try { // ... } catch (error) { // ... } revalidatePath('/posts') } Or invalidate a specific data fetch with a cache tag using [`revalidateTag`](/docs/app/api-reference/functions/revalidateTag): app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { revalidateTag } from 'next/cache' export async function createPost() { try { // ... } catch (error) { // ... } revalidateTag('posts') } ### [Redirecting](#redirecting) If you would like to redirect the user to a different route after the completion of a Server Action, you can use [`redirect`](/docs/app/api-reference/functions/redirect) API. `redirect` needs to be called outside of the `try/catch` block: app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { redirect } from 'next/navigation' import { revalidateTag } from 'next/cache' export async function createPost(id: string) { try { // ... } catch (error) { // ... } revalidateTag('posts') // Update cached posts redirect(`/post/${id}`) // Navigate to the new post page } ### [Cookies](#cookies) You can `get`, `set`, and `delete` cookies inside a Server Action using the [`cookies`](/docs/app/api-reference/functions/cookies) API: app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { cookies } from 'next/headers' export async function exampleAction() { // Get cookie const value = cookies().get('name')?.value // Set cookie cookies().set('name', 'Delba') // Delete cookie cookies().delete('name') } See [additional examples](/docs/app/api-reference/functions/cookies#deleting-cookies) for deleting cookies from Server Actions. [Security](#security) --------------------- ### [Authentication and authorization](#authentication-and-authorization) You should treat Server Actions as you would public-facing API endpoints, and ensure that the user is authorized to perform the action. For example: app/actions.ts 'use server' import { auth } from './lib' export function addItem() { const { user } = auth() if (!user) { throw new Error('You must be signed in to perform this action') } // ... } ### [Closures and encryption](#closures-and-encryption) Defining a Server Action inside a component creates a [closure](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures) where the action has access to the outer function's scope. For example, the `publish` action has access to the `publishVersion` variable: app/page.tsx TypeScript JavaScriptTypeScript export default function Page() { const publishVersion = await getLatestVersion(); async function publish(formData: FormData) { "use server"; if (publishVersion !== await getLatestVersion()) { throw new Error('The version has changed since pressing publish'); } ... } return <button action={publish}>Publish</button>; } Closures are useful when you need to capture a _snapshot_ of data (e.g. `publishVersion`) at the time of rendering so that it can be used later when the action is invoked. However, for this to happen, the captured variables are sent to the client and back to the server when the action is invoked. To prevent sensitive data from being exposed to the client, Next.js automatically encrypts the closed-over variables. A new private key is generated for each action every time a Next.js application is built. This means actions can only be invoked for a specific build. > **Good to know:** We don't recommend relying on encryption alone to prevent sensitive values from being exposed on the client. Instead, you should use the [React taint APIs](/docs/app/building-your-application/data-fetching/patterns#preventing-sensitive-data-from-being-exposed-to-the-client) to proactively prevent specific data from being sent to the client. ### [Overwriting encryption keys (advanced)](#overwriting-encryption-keys-advanced) When self-hosting your Next.js application across multiple servers, each server instance may end up with a different encryption key, leading to potential inconsistencies. To mitigate this, you can overwrite the encryption key using the `process.env.NEXT_SERVER_ACTIONS_ENCRYPTION_KEY` environment variable. Specifying this variable ensures that your encryption keys are persistent across builds, and all server instances use the same key. This is an advanced use case where consistent encryption behavior across multiple deployments is critical for your application. You should consider standard security practices such key rotation and signing. > **Good to know:** Next.js applications deployed to Vercel automatically handle this. ### [Allowed origins (advanced)](#allowed-origins-advanced) Since Server Actions can be invoked in a `<form>` element, this opens them up to [CSRF attacks](https://developer.mozilla.org/en-US/docs/Glossary/CSRF). Behind the scenes, Server Actions use the `POST` method, and only this HTTP method is allowed to invoke them. This prevents most CSRF vulnerabilities in modern browsers, particularly with [SameSite cookies](https://web.dev/articles/samesite-cookies-explained) being the default. As an additional protection, Server Actions in Next.js also compare the [Origin header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Origin) to the [Host header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Host) (or `X-Forwarded-Host`). If these don't match, the request will be aborted. In other words, Server Actions can only be invoked on the same host as the page that hosts it. For large applications that use reverse proxies or multi-layered backend architectures (where the server API differs from the production domain), it's recommended to use the configuration option [`serverActions.allowedOrigins`](/docs/app/api-reference/next-config-js/serverActions) option to specify a list of safe origins. The option accepts an array of strings. next.config.js /** @type {import('next').NextConfig} */ module.exports = { experimental: { serverActions: { allowedOrigins: ['my-proxy.com', '*.my-proxy.com'], }, }, } Learn more about [Security and Server Actions](https://nextjs.org/blog/security-nextjs-server-components-actions). [Additional resources](#additional-resources) --------------------------------------------- For more information on Server Actions, check out the following React docs: * [`"use server"`](https://react.dev/reference/react/use-server) * [`<form>`](https://react.dev/reference/react-dom/components/form) * [`useFormStatus`](https://react.dev/reference/react-dom/hooks/useFormStatus) * [`useFormState`](https://react.dev/reference/react-dom/hooks/useFormState) * [`useOptimistic`](https://react.dev/reference/react/useOptimistic) Next Steps ---------- Learn how to configure Server Actions in Next.js [ App Router ... next.config.js Options ### serverActions Configure Server Actions behavior in your Next.js application. ](/docs/app/api-reference/next-config-js/serverActions) [Previous Fetching, Caching, and Revalidating ](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) [Next Data Fetching Patterns and Best Practices ](/docs/app/building-your-application/data-fetching/patterns) Was this helpful? supported. 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Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)Building Your Application Building Your Application ========================= Next.js provides the building blocks to create flexible, full-stack web applications. The guides in **Building Your Application** explain how to use these features and how to customize your application's behavior. The sections and pages are organized sequentially, from basic to advanced, so you can follow them step-by-step when building your Next.js application. However, you can read them in any order or skip to the pages that apply to your use case. If you're new to Next.js, we recommend starting with the [Routing](/docs/app/building-your-application/routing), [Rendering](/docs/app/building-your-application/rendering), [Data Fetching](/docs/app/building-your-application/data-fetching) and [Styling](/docs/app/building-your-application/styling) sections, as they introduce the fundamental Next.js and web concepts to help you get started. Then, you can dive deeper into the other sections such as [Optimizing](/docs/app/building-your-application/optimizing) and [Configuring](/docs/app/building-your-application/configuring). Finally, once you're ready, checkout the [Deploying](/docs/app/building-your-application/deploying) and [Upgrading](/docs/app/building-your-application/upgrading) sections. [ ### Routing Learn the fundamentals of routing for front-end applications. ](/docs/app/building-your-application/routing)[ ### Data Fetching Learn how to fetch, cache, revalidate, and mutate data with Next.js. ](/docs/app/building-your-application/data-fetching)[ ### Rendering Learn the differences between Next.js rendering environments, strategies, and runtimes. ](/docs/app/building-your-application/rendering)[ ### Caching An overview of caching mechanisms in Next.js. ](/docs/app/building-your-application/caching)[ ### Styling Learn the different ways you can style your Next.js application. ](/docs/app/building-your-application/styling)[ ### Optimizing Optimize your Next.js application for best performance and user experience. ](/docs/app/building-your-application/optimizing)[ ### Configuring Learn how to configure your Next.js application. ](/docs/app/building-your-application/configuring)[ ### Testing Learn how to set up Next.js with four commonly used testing tools — Cypress, Playwright, Vitest, and Jest. ](/docs/app/building-your-application/testing)[ ### Authentication Learn how to implement authentication in Next.js, covering best practices, securing routes, authorization techniques, and session management. ](/docs/app/building-your-application/authentication)[ ### Deploying Learn how to deploy your Next.js app to production, either managed or self-hosted. ](/docs/app/building-your-application/deploying)[ ### Upgrading Learn how to upgrade to the latest versions of Next.js. ](/docs/app/building-your-application/upgrading) [Previous App Router ](/docs/app) [Next Routing ](/docs/app/building-your-application/routing) Was this helpful? supported. 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[Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering 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[reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Automatic Installation](#automatic-installation) * [Manual Installation](#manual-installation) * [Creating directories](#creating-directories) * [The app directory](#the-app-directory) * [The pages directory (optional)](#the-pages-directory-optional) * [The public folder (optional)](#the-public-folder-optional) * [Run the Development Server](#run-the-development-server) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/01-getting-started/01-installation.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Getting Started](/docs/getting-started)Installation Installation ============ System Requirements: * [Node.js 18.17](https://nodejs.org/) or later. * macOS, Windows (including WSL), and Linux are supported. [Automatic Installation](#automatic-installation) ------------------------------------------------- We recommend starting a new Next.js app using [`create-next-app`](/docs/app/api-reference/create-next-app), which sets up everything automatically for you. To create a project, run: Terminal npx create-next-app@latest On installation, you'll see the following prompts: Terminal What is your project named? my-app Would you like to use TypeScript? No / Yes Would you like to use ESLint? No / Yes Would you like to use Tailwind CSS? No / Yes Would you like to use `src/` directory? No / Yes Would you like to use App Router? (recommended) No / Yes Would you like to customize the default import alias (@/*)? No / Yes What import alias would you like configured? @/* After the prompts, `create-next-app` will create a folder with your project name and install the required dependencies. If you're new to Next.js, see the [project structure](/docs/getting-started/project-structure) docs for an overview of all the possible files and folders in your application. > **Good to know**: > > * Next.js now ships with [TypeScript](/docs/app/building-your-application/configuring/typescript), [ESLint](/docs/app/building-your-application/configuring/eslint), and [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css) configuration by default. > * You can optionally use a [`src` directory](/docs/app/building-your-application/configuring/src-directory) in the root of your project to separate your application's code from configuration files. [Manual Installation](#manual-installation) ------------------------------------------- To manually create a new Next.js app, install the required packages: Terminal npm install next@latest react@latest react-dom@latest Open your `package.json` file and add the following `scripts`: package.json { "scripts": { "dev": "next dev", "build": "next build", "start": "next start", "lint": "next lint" } } These scripts refer to the different stages of developing an application: * `dev`: runs [`next dev`](/docs/app/api-reference/next-cli#development) to start Next.js in development mode. * `build`: runs [`next build`](/docs/app/api-reference/next-cli#build) to build the application for production usage. * `start`: runs [`next start`](/docs/app/api-reference/next-cli#production) to start a Next.js production server. * `lint`: runs [`next lint`](/docs/app/api-reference/next-cli#lint) to set up Next.js' built-in ESLint configuration. ### [Creating directories](#creating-directories) Next.js uses file-system routing, which means the routes in your application are determined by how you structure your files. #### [The `app` directory](#the-app-directory) For new applications, we recommend using the [App Router](/docs/app). This router allows you to use React's latest features and is an evolution of the [Pages Router](/docs/pages) based on community feedback. Create an `app/` folder, then add a `layout.tsx` and `page.tsx` file. These will be rendered when the user visits the root of your application (`/`).  Create a [root layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required) inside `app/layout.tsx` with the required `<html>` and `<body>` tags: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body>{children}</body> </html> ) } Finally, create a home page `app/page.tsx` with some initial content: app/page.tsx TypeScript JavaScriptTypeScript export default function Page() { return <h1>Hello, Next.js!</h1> } > **Good to know**: If you forget to create `layout.tsx`, Next.js will automatically create this file when running the development server with `next dev`. Learn more about [using the App Router](/docs/app/building-your-application/routing/defining-routes). #### [The `pages` directory (optional)](#the-pages-directory-optional) If you prefer to use the Pages Router instead of the App Router, you can create a `pages/` directory at the root of your project. Then, add an `index.tsx` file inside your `pages` folder. This will be your home page (`/`): pages/index.tsx TypeScript JavaScriptTypeScript export default function Page() { return <h1>Hello, Next.js!</h1> } Next, add an `_app.tsx` file inside `pages/` to define the global layout. Learn more about the [custom App file](/docs/pages/building-your-application/routing/custom-app). pages/\_app.tsx TypeScript JavaScriptTypeScript import type { AppProps } from 'next/app' export default function App({ Component, pageProps }: AppProps) { return <Component {...pageProps} /> } Finally, add a `_document.tsx` file inside `pages/` to control the initial response from the server. Learn more about the [custom Document file](/docs/pages/building-your-application/routing/custom-document). pages/\_document.tsx TypeScript JavaScriptTypeScript import { Html, Head, Main, NextScript } from 'next/document' export default function Document() { return ( <Html> <Head /> <body> <Main /> <NextScript /> </body> </Html> ) } Learn more about [using the Pages Router](/docs/pages/building-your-application/routing/pages-and-layouts). > **Good to know**: Although you can use both routers in the same project, routes in `app` will be prioritized over `pages`. We recommend using only one router in your new project to avoid confusion. #### [The `public` folder (optional)](#the-public-folder-optional) Create a `public` folder to store static assets such as images, fonts, etc. Files inside `public` directory can then be referenced by your code starting from the base URL (`/`). [Run the Development Server](#run-the-development-server) --------------------------------------------------------- 1. Run `npm run dev` to start the development server. 2. Visit `http://localhost:3000` to view your application. 3. Edit `app/page.tsx` (or `pages/index.tsx`) file and save it to see the updated result in your browser. Next Steps ---------- Learn about the files and folders in your Next.js project. [ Getting Started ### Project Structure A list of folders and files conventions in a Next.js project ](/docs/getting-started/project-structure) [Previous Introduction ](/docs) [Next Project Structure ](/docs/getting-started/project-structure) Was this helpful? supported. Send

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[generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [What is Next.js?](#what-is-nextjs) * [Main Features](#main-features) * [How to Use These Docs](#how-to-use-these-docs) * [App Router vs Pages Router](#app-router-vs-pages-router) * [Pre-Requisite Knowledge](#pre-requisite-knowledge) * [Accessibility](#accessibility) * [Join our Community](#join-our-community) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top Introduction ============ Welcome to the Next.js documentation! [What is Next.js?](#what-is-nextjs) ----------------------------------- Next.js is a React framework for building full-stack web applications. You use React Components to build user interfaces, and Next.js for additional features and optimizations. Under the hood, Next.js also abstracts and automatically configures tooling needed for React, like bundling, compiling, and more. This allows you to focus on building your application instead of spending time with configuration. Whether you're an individual developer or part of a larger team, Next.js can help you build interactive, dynamic, and fast React applications. [Main Features](#main-features) ------------------------------- Some of the main Next.js features include: Feature Description [Routing](/docs/app/building-your-application/routing) A file-system based router built on top of Server Components that supports layouts, nested routing, loading states, error handling, and more. [Rendering](/docs/app/building-your-application/rendering) Client-side and Server-side Rendering with Client and Server Components. Further optimized with Static and Dynamic Rendering on the server with Next.js. Streaming on Edge and Node.js runtimes. [Data Fetching](/docs/app/building-your-application/data-fetching) Simplified data fetching with async/await in Server Components, and an extended `fetch` API for request memoization, data caching and revalidation. [Styling](/docs/app/building-your-application/styling) Support for your preferred styling methods, including CSS Modules, Tailwind CSS, and CSS-in-JS [Optimizations](/docs/app/building-your-application/optimizing) Image, Fonts, and Script Optimizations to improve your application's Core Web Vitals and User Experience. [TypeScript](/docs/app/building-your-application/configuring/typescript) Improved support for TypeScript, with better type checking and more efficient compilation, as well as custom TypeScript Plugin and type checker. [How to Use These Docs](#how-to-use-these-docs) ----------------------------------------------- On the left side of the screen, you'll find the docs navbar. The pages of the docs are organized sequentially, from basic to advanced, so you can follow them step-by-step when building your application. However, you can read them in any order or skip to the pages that apply to your use case. On the right side of the screen, you'll see a table of contents that makes it easier to navigate between sections of a page. If you need to quickly find a page, you can use the search bar at the top, or the search shortcut (`Ctrl+K` or `Cmd+K`). To get started, checkout the [Installation](/docs/getting-started/installation) guide. [App Router vs Pages Router](#app-router-vs-pages-router) --------------------------------------------------------- Next.js has two different routers: the App Router and the Pages Router. The App Router is a newer router that allows you to use React's latest features, such as Server Components and Streaming. The Pages Router is the original Next.js router, which allowed you to build server-rendered React applications and continues to be supported for older Next.js applications. At the top of the sidebar, you'll notice a dropdown menu that allows you to switch between the **App Router** and the **Pages Router** features. Since there are features that are unique to each directory, it's important to keep track of which tab is selected. The breadcrumbs at the top of the page will also indicate whether you're viewing App Router docs or Pages Router docs. [Pre-Requisite Knowledge](#pre-requisite-knowledge) --------------------------------------------------- Although our docs are designed to be beginner-friendly, we need to establish a baseline so that the docs can stay focused on Next.js functionality. We'll make sure to provide links to relevant documentation whenever we introduce a new concept. To get the most out of our docs, it's recommended that you have a basic understanding of HTML, CSS, and React. If you need to brush up on your React skills, check out our [React Foundations Course](/learn/react-foundations), which will introduce you to the fundamentals. Then, learn more about Next.js by [building a dashboard application](/learn/dashboard-app). [Accessibility](#accessibility) ------------------------------- For optimal accessibility when using a screen reader while reading the docs, we recommend using Firefox and NVDA, or Safari and VoiceOver. [Join our Community](#join-our-community) ----------------------------------------- If you have questions about anything related to Next.js, you're always welcome to ask our community on [GitHub Discussions](https://github.com/vercel/next.js/discussions), [Discord](https://discord.com/invite/bUG2bvbtHy), [Twitter](https://twitter.com/nextjs), and [Reddit](https://www.reddit.com/r/nextjs). [ ### Getting Started Learn how to create full-stack web applications with Next.js. ](/docs/getting-started)[ ### App Router Use the new App Router with Next.js' and React's latest features, including Layouts, Server Components, Suspense, and more. ](/docs/app)[ ### Pages Router Before Next.js 13, the Pages Router was the main way to create routes in Next.js with an intuitive file-system router. ](/docs/pages)[ ### Architecture How Next.js Works ](/docs/architecture)[ ### Community Get involved in the Next.js community. ](/docs/community) [Next Installation ](/docs/getting-started/installation) Was this helpful? supported. Send

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Menu Using App Router Features available in /app * [Getting Started](/docs/getting-started) * [Installation](/docs/getting-started/installation) * [Project Structure](/docs/getting-started/project-structure) * [Building Your Application](/docs/app/building-your-application) * [Routing](/docs/app/building-your-application/routing) * [Defining Routes](/docs/app/building-your-application/routing/defining-routes) * [Pages and Layouts](/docs/app/building-your-application/routing/pages-and-layouts) * [Linking and Navigating](/docs/app/building-your-application/routing/linking-and-navigating) * [Loading UI and Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [Error Handling](/docs/app/building-your-application/routing/error-handling) * [Redirecting](/docs/app/building-your-application/routing/redirecting) * [Route Groups](/docs/app/building-your-application/routing/route-groups) * [Project Organization](/docs/app/building-your-application/routing/colocation) * [Dynamic Routes](/docs/app/building-your-application/routing/dynamic-routes) * [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) * [Intercepting Routes](/docs/app/building-your-application/routing/intercepting-routes) * [Route Handlers](/docs/app/building-your-application/routing/route-handlers) * [Middleware](/docs/app/building-your-application/routing/middleware) * [Internationalization](/docs/app/building-your-application/routing/internationalization) * [Data Fetching](/docs/app/building-your-application/data-fetching) * [Fetching, Caching, and Revalidating](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) * [Server Actions and Mutations](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) * [Data Fetching Patterns and Best Practices](/docs/app/building-your-application/data-fetching/patterns) * [Rendering](/docs/app/building-your-application/rendering) * [Server Components](/docs/app/building-your-application/rendering/server-components) * [Client Components](/docs/app/building-your-application/rendering/client-components) * [Composition Patterns](/docs/app/building-your-application/rendering/composition-patterns) * [Edge and Node.js Runtimes](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) * [Caching](/docs/app/building-your-application/caching) * [Styling](/docs/app/building-your-application/styling) * [CSS Modules](/docs/app/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/app/building-your-application/styling/css-in-js) * [Sass](/docs/app/building-your-application/styling/sass) * [Optimizing](/docs/app/building-your-application/optimizing) * [Images](/docs/app/building-your-application/optimizing/images) * [Videos](/docs/app/building-your-application/optimizing/videos) * 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[ESLint](/docs/app/building-your-application/configuring/eslint) * [Environment Variables](/docs/app/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases) * [MDX](/docs/app/building-your-application/configuring/mdx) * [src Directory](/docs/app/building-your-application/configuring/src-directory) * [Draft Mode](/docs/app/building-your-application/configuring/draft-mode) * [Content Security Policy](/docs/app/building-your-application/configuring/content-security-policy) * [Testing](/docs/app/building-your-application/testing) * [Vitest](/docs/app/building-your-application/testing/vitest) * [Jest](/docs/app/building-your-application/testing/jest) * [Playwright](/docs/app/building-your-application/testing/playwright) * [Cypress](/docs/app/building-your-application/testing/cypress) * [Authentication](/docs/app/building-your-application/authentication) * 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[<Script>](/docs/app/api-reference/components/script) * [File Conventions](/docs/app/api-reference/file-conventions) * [default.js](/docs/app/api-reference/file-conventions/default) * [error.js](/docs/app/api-reference/file-conventions/error) * [instrumentation.js](/docs/app/api-reference/file-conventions/instrumentation) * [layout.js](/docs/app/api-reference/file-conventions/layout) * [loading.js](/docs/app/api-reference/file-conventions/loading) * [middleware.js](/docs/app/api-reference/file-conventions/middleware) * [not-found.js](/docs/app/api-reference/file-conventions/not-found) * [page.js](/docs/app/api-reference/file-conventions/page) * [route.js](/docs/app/api-reference/file-conventions/route) * [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) * [template.js](/docs/app/api-reference/file-conventions/template) * [Metadata Files](/docs/app/api-reference/file-conventions/metadata) * [favicon, icon, and apple-icon](/docs/app/api-reference/file-conventions/metadata/app-icons) * [manifest.json](/docs/app/api-reference/file-conventions/metadata/manifest) * [opengraph-image and twitter-image](/docs/app/api-reference/file-conventions/metadata/opengraph-image) * [robots.txt](/docs/app/api-reference/file-conventions/metadata/robots) * [sitemap.xml](/docs/app/api-reference/file-conventions/metadata/sitemap) * [Functions](/docs/app/api-reference/functions) * [ cookies](/docs/app/api-reference/functions/cookies) * [draftMode](/docs/app/api-reference/functions/draft-mode) * [fetch](/docs/app/api-reference/functions/fetch) * [generateImageMetadata](/docs/app/api-reference/functions/generate-image-metadata) * [generateMetadata](/docs/app/api-reference/functions/generate-metadata) * [generateSitemaps](/docs/app/api-reference/functions/generate-sitemaps) * [generateStaticParams](/docs/app/api-reference/functions/generate-static-params) * [generateViewport](/docs/app/api-reference/functions/generate-viewport) * [headers](/docs/app/api-reference/functions/headers) * [ImageResponse](/docs/app/api-reference/functions/image-response) * [NextRequest](/docs/app/api-reference/functions/next-request) * [NextResponse](/docs/app/api-reference/functions/next-response) * [notFound](/docs/app/api-reference/functions/not-found) * [permanentRedirect](/docs/app/api-reference/functions/permanentRedirect) * [redirect](/docs/app/api-reference/functions/redirect) * [revalidatePath](/docs/app/api-reference/functions/revalidatePath) * [revalidateTag](/docs/app/api-reference/functions/revalidateTag) * [unstable\_cache](/docs/app/api-reference/functions/unstable_cache) * [unstable\_noStore](/docs/app/api-reference/functions/unstable_noStore) * [useParams](/docs/app/api-reference/functions/use-params) * [usePathname](/docs/app/api-reference/functions/use-pathname) * [useReportWebVitals](/docs/app/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/app/api-reference/functions/use-router) * [useSearchParams](/docs/app/api-reference/functions/use-search-params) * [useSelectedLayoutSegment](/docs/app/api-reference/functions/use-selected-layout-segment) * [useSelectedLayoutSegments](/docs/app/api-reference/functions/use-selected-layout-segments) * [userAgent](/docs/app/api-reference/functions/userAgent) * [next.config.js Options](/docs/app/api-reference/next-config-js) * [appDir](/docs/app/api-reference/next-config-js/appDir) * [assetPrefix](/docs/app/api-reference/next-config-js/assetPrefix) * [basePath](/docs/app/api-reference/next-config-js/basePath) * [compress](/docs/app/api-reference/next-config-js/compress) * [crossOrigin](/docs/app/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/app/api-reference/next-config-js/devIndicators) * [distDir](/docs/app/api-reference/next-config-js/distDir) * [env](/docs/app/api-reference/next-config-js/env) * [eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [cookies().get(name)](#cookiesgetname) * [cookies().getAll()](#cookiesgetall) * [cookies().has(name)](#cookieshasname) * [cookies().set(name, value, options)](#cookiessetname-value-options) * [Deleting cookies](#deleting-cookies) * [cookies().delete(name)](#cookiesdeletename) * [cookies().set(name, '')](#cookiessetname-) * [cookies().set(name, value, { maxAge: 0 })](#cookiessetname-value--maxage-0-) * [cookies().set(name, value, { expires: timestamp })](#cookiessetname-value--expires-timestamp-) * [Version History](#version-history) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/cookies.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)cookies cookies ======= The `cookies` function allows you to read the HTTP incoming request cookies from a [Server Component](/docs/app/building-your-application/rendering/server-components) or write outgoing request cookies in a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) or [Route Handler](/docs/app/building-your-application/routing/route-handlers). > **Good to know**: `cookies()` is a **[Dynamic Function](/docs/app/building-your-application/rendering/server-components#server-rendering-strategies#dynamic-functions)** whose returned values cannot be known ahead of time. Using it in a layout or page will opt a route into **[dynamic rendering](/docs/app/building-your-application/rendering/server-components#dynamic-rendering)** at request time. [`cookies().get(name)`](#cookiesgetname) ---------------------------------------- A method that takes a cookie name and returns an object with name and value. If a cookie with `name` isn't found, it returns `undefined`. If multiple cookies match, it will only return the first match. app/page.js import { cookies } from 'next/headers' export default function Page() { const cookieStore = cookies() const theme = cookieStore.get('theme') return '...' } [`cookies().getAll()`](#cookiesgetall) -------------------------------------- A method that is similar to `get`, but returns a list of all the cookies with a matching `name`. If `name` is unspecified, it returns all the available cookies. app/page.js import { cookies } from 'next/headers' export default function Page() { const cookieStore = cookies() return cookieStore.getAll().map((cookie) => ( <div key={cookie.name}> <p>Name: {cookie.name}</p> <p>Value: {cookie.value}</p> </div> )) } [`cookies().has(name)`](#cookieshasname) ---------------------------------------- A method that takes a cookie name and returns a `boolean` based on if the cookie exists (`true`) or not (`false`). app/page.js import { cookies } from 'next/headers' export default function Page() { const cookieStore = cookies() const hasCookie = cookieStore.has('theme') return '...' } [`cookies().set(name, value, options)`](#cookiessetname-value-options) ---------------------------------------------------------------------- A method that takes a cookie name, value, and options and sets the outgoing request cookie. > **Good to know**: HTTP does not allow setting cookies after streaming starts, so you must use `.set()` in a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) or [Route Handler](/docs/app/building-your-application/routing/route-handlers). app/actions.js 'use server' import { cookies } from 'next/headers' async function create(data) { cookies().set('name', 'lee') // or cookies().set('name', 'lee', { secure: true }) // or cookies().set({ name: 'name', value: 'lee', httpOnly: true, path: '/', }) } [Deleting cookies](#deleting-cookies) ------------------------------------- > **Good to know**: You can only delete cookies in a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) or [Route Handler](/docs/app/building-your-application/routing/route-handlers). There are several options for deleting a cookie: ### [`cookies().delete(name)`](#cookiesdeletename) You can explicitly delete a cookie with a given name. app/actions.js 'use server' import { cookies } from 'next/headers' async function delete(data) { cookies().delete('name') } ### [`cookies().set(name, '')`](#cookiessetname-) Alternatively, you can set a new cookie with the same name and an empty value. app/actions.js 'use server' import { cookies } from 'next/headers' async function delete(data) { cookies().set('name', '') } > **Good to know**: `.set()` is only available in a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) or [Route Handler](/docs/app/building-your-application/routing/route-handlers). ### [`cookies().set(name, value, { maxAge: 0 })`](#cookiessetname-value--maxage-0-) Setting `maxAge` to 0 will immediately expire a cookie. app/actions.js 'use server' import { cookies } from 'next/headers' async function delete(data) { cookies().set('name', 'value', { maxAge: 0 }) } ### [`cookies().set(name, value, { expires: timestamp })`](#cookiessetname-value--expires-timestamp-) Setting `expires` to any value in the past will immediately expire a cookie. app/actions.js 'use server' import { cookies } from 'next/headers' async function delete(data) { const oneDay = 24 * 60 * 60 * 1000 cookies().set('name', 'value', { expires: Date.now() - oneDay }) } > **Good to know**: You can only delete cookies that belong to the same domain from which `.set()` is called. Additionally, the code must be executed on the same protocol (HTTP or HTTPS) as the cookie you want to delete. [Version History](#version-history) ----------------------------------- Version Changes `v13.0.0` `cookies` introduced. Next Steps ---------- For more information on what to do next, we recommend the following sections [ App Router ... Data Fetching ### Server Actions and Mutations Learn how to handle form submissions and data mutations with Next.js. ](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) [Previous Functions ](/docs/app/api-reference/functions) [Next draftMode ](/docs/app/api-reference/functions/draft-mode) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Benefits of Client Rendering](#benefits-of-client-rendering) * [Using Client Components in Next.js](#using-client-components-in-nextjs) * [How are Client Components Rendered?](#how-are-client-components-rendered) * [Full page load](#full-page-load) * [Subsequent Navigations](#subsequent-navigations) * [Going back to the Server Environment](#going-back-to-the-server-environment) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/03-rendering/02-client-components.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Rendering](/docs/app/building-your-application/rendering)Client Components Client Components ================= Client Components allow you to write interactive UI that is [prerendered on the server](https://github.com/reactwg/server-components/discussions/4) and can use client JavaScript to run in the browser. This page will go through how Client Components work, how they're rendered, and when you might use them. [Benefits of Client Rendering](#benefits-of-client-rendering) ------------------------------------------------------------- There are a couple of benefits to doing the rendering work on the client, including: * **Interactivity**: Client Components can use state, effects, and event listeners, meaning they can provide immediate feedback to the user and update the UI. * **Browser APIs**: Client Components have access to browser APIs, like [geolocation](https://developer.mozilla.org/docs/Web/API/Geolocation_API) or [localStorage](https://developer.mozilla.org/docs/Web/API/Window/localStorage). [Using Client Components in Next.js](#using-client-components-in-nextjs) ------------------------------------------------------------------------ To use Client Components, you can add the React [`"use client"` directive](https://react.dev/reference/react/use-client) at the top of a file, above your imports. `"use client"` is used to declare a [boundary](/docs/app/building-your-application/rendering#network-boundary) between a Server and Client Component modules. This means that by defining a `"use client"` in a file, all other modules imported into it, including child components, are considered part of the client bundle. app/counter.tsx TypeScript JavaScriptTypeScript 'use client' import { useState } from 'react' export default function Counter() { const [count, setCount] = useState(0) return ( <div> <p>You clicked {count} times</p> <button onClick={() => setCount(count + 1)}>Click me</button> </div> ) } The diagram below shows that using `onClick` and `useState` in a nested component (`toggle.js`) will cause an error if the `"use client"` directive is not defined. This is because, by default, all components in the App Router are Server Components where these APIs are not available. By defining the `"use client"` directive in `toggle.js`, you can tell React to enter the client boundary where these APIs are available.  > **Defining multiple `use client` entry points**: > > You can define multiple "use client" entry points in your React Component tree. This allows you to split your application into multiple client bundles. > > However, `"use client"` doesn't need to be defined in every component that needs to be rendered on the client. Once you define the boundary, all child components and modules imported into it are considered part of the client bundle. [How are Client Components Rendered?](#how-are-client-components-rendered) -------------------------------------------------------------------------- In Next.js, Client Components are rendered differently depending on whether the request is part of a full page load (an initial visit to your application or a page reload triggered by a browser refresh) or a subsequent navigation. ### [Full page load](#full-page-load) To optimize the initial page load, Next.js will use React's APIs to render a static HTML preview on the server for both Client and Server Components. This means, when the user first visits your application, they will see the content of the page immediately, without having to wait for the client to download, parse, and execute the Client Component JavaScript bundle. On the server: 1. React renders Server Components into a special data format called the **React Server Component Payload (RSC Payload)**, which includes references to Client Components. 2. Next.js uses the RSC Payload and Client Component JavaScript instructions to render **HTML** for the route on the server. Then, on the client: 1. The HTML is used to immediately show a fast non-interactive initial preview of the route. 2. The React Server Components Payload is used to reconcile the Client and Server Component trees, and update the DOM. 3. The JavaScript instructions are used to [hydrate](https://react.dev/reference/react-dom/client/hydrateRoot) Client Components and make their UI interactive. > **What is hydration?** > > Hydration is the process of attaching event listeners to the DOM, to make the static HTML interactive. Behind the scenes, hydration is done with the [`hydrateRoot`](https://react.dev/reference/react-dom/client/hydrateRoot) React API. ### [Subsequent Navigations](#subsequent-navigations) On subsequent navigations, Client Components are rendered entirely on the client, without the server-rendered HTML. This means the Client Component JavaScript bundle is downloaded and parsed. Once the bundle is ready, React will use the RSC Payload to reconcile the Client and Server Component trees, and update the DOM. [Going back to the Server Environment](#going-back-to-the-server-environment) ----------------------------------------------------------------------------- Sometimes, after you've declared the `"use client"` boundary, you may want to go back to the server environment. For example, you may want to reduce the client bundle size, fetch data on the server, or use an API that is only available on the server. You can keep code on the server even though it's theoretically nested inside Client Components by interleaving Client and Server Components and [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). See the [Composition Patterns](/docs/app/building-your-application/rendering/composition-patterns) page for more information. [Previous Server Components ](/docs/app/building-your-application/rendering/server-components) [Next Composition Patterns ](/docs/app/building-your-application/rendering/composition-patterns) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Overview](#overview) * [Request Memoization](#request-memoization) * [Duration](#duration) * [Revalidating](#revalidating) * [Opting out](#opting-out) * [Data Cache](#data-cache) * [Duration](#duration-1) * [Revalidating](#revalidating-1) * [Time-based Revalidation](#time-based-revalidation) * [On-demand Revalidation](#on-demand-revalidation) * [Opting out](#opting-out-1) * [Full Route Cache](#full-route-cache) * [1\. React Rendering on the Server](#1-react-rendering-on-the-server) * [2\. Next.js Caching on the Server (Full Route Cache)](#2-nextjs-caching-on-the-server-full-route-cache) * [3\. React Hydration and Reconciliation on the Client](#3-react-hydration-and-reconciliation-on-the-client) * [4\. Next.js Caching on the Client (Router Cache)](#4-nextjs-caching-on-the-client-router-cache) * [5\. Subsequent Navigations](#5-subsequent-navigations) * [Static and Dynamic Rendering](#static-and-dynamic-rendering) * [Duration](#duration-2) * [Invalidation](#invalidation) * [Opting out](#opting-out-2) * [Router Cache](#router-cache) * [Duration](#duration-3) * [Invalidation](#invalidation-1) * [Opting out](#opting-out-3) * [Cache Interactions](#cache-interactions) * [Data Cache and Full Route Cache](#data-cache-and-full-route-cache) * [Data Cache and Client-side Router cache](#data-cache-and-client-side-router-cache) * [APIs](#apis) * [<Link>](#link) * [router.prefetch](#routerprefetch) * [router.refresh](#routerrefresh) * [fetch](#fetch) * [fetch options.cache](#fetch-optionscache) * [fetch options.next.revalidate](#fetch-optionsnextrevalidate) * [fetch options.next.tags and revalidateTag](#fetch-optionsnexttags-and-revalidatetag) * [revalidatePath](#revalidatepath) * [Dynamic Functions](#dynamic-functions) * [cookies](#cookies) * [Segment Config Options](#segment-config-options) * [generateStaticParams](#generatestaticparams) * [React cache function](#react-cache-function) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/04-caching/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[Building Your Application](/docs/app/building-your-application)Caching Caching in Next.js ================== Next.js improves your application's performance and reduces costs by caching rendering work and data requests. This page provides an in-depth look at Next.js caching mechanisms, the APIs you can use to configure them, and how they interact with each other. > **Good to know**: This page helps you understand how Next.js works under the hood but is **not** essential knowledge to be productive with Next.js. Most of Next.js' caching heuristics are determined by your API usage and have defaults for the best performance with zero or minimal configuration. [Overview](#overview) --------------------- Here's a high-level overview of the different caching mechanisms and their purpose: Mechanism What Where Purpose Duration [Request Memoization](#request-memoization) Return values of functions Server Re-use data in a React Component tree Per-request lifecycle [Data Cache](#data-cache) Data Server Store data across user requests and deployments Persistent (can be revalidated) [Full Route Cache](#full-route-cache) HTML and RSC payload Server Reduce rendering cost and improve performance Persistent (can be revalidated) [Router Cache](#router-cache) RSC Payload Client Reduce server requests on navigation User session or time-based By default, Next.js will cache as much as possible to improve performance and reduce cost. This means routes are **statically rendered** and data requests are **cached** unless you opt out. The diagram below shows the default caching behavior: when a route is statically rendered at build time and when a static route is first visited.  Caching behavior changes depending on whether the route is statically or dynamically rendered, data is cached or uncached, and whether a request is part of an initial visit or a subsequent navigation. Depending on your use case, you can configure the caching behavior for individual routes and data requests. [Request Memoization](#request-memoization) ------------------------------------------- React extends the [`fetch` API](#fetch) to automatically **memoize** requests that have the same URL and options. This means you can call a fetch function for the same data in multiple places in a React component tree while only executing it once.  For example, if you need to use the same data across a route (e.g. in a Layout, Page, and multiple components), you do not have to fetch data at the top of the tree, and forward props between components. Instead, you can fetch data in the components that need it without worrying about the performance implications of making multiple requests across the network for the same data. app/example.tsx TypeScript JavaScriptTypeScript async function getItem() { // The `fetch` function is automatically memoized and the result // is cached const res = await fetch('https://.../item/1') return res.json() } // This function is called twice, but only executed the first time const item = await getItem() // cache MISS // The second call could be anywhere in your route const item = await getItem() // cache HIT **How Request Memoization Works**  * While rendering a route, the first time a particular request is called, its result will not be in memory and it'll be a cache `MISS`. * Therefore, the function will be executed, and the data will be fetched from the external source, and the result will be stored in memory. * Subsequent function calls of the request in the same render pass will be a cache `HIT`, and the data will be returned from memory without executing the function. * Once the route has been rendered and the rendering pass is complete, memory is "reset" and all request memoization entries are cleared. > **Good to know**: > > * Request memoization is a React feature, not a Next.js feature. It's included here to show how it interacts with the other caching mechanisms. > * Memoization only applies to the `GET` method in `fetch` requests. > * Memoization only applies to the React Component tree, this means: > * It applies to `fetch` requests in `generateMetadata`, `generateStaticParams`, Layouts, Pages, and other Server Components. > * It doesn't apply to `fetch` requests in Route Handlers as they are not a part of the React component tree. > * For cases where `fetch` is not suitable (e.g. some database clients, CMS clients, or GraphQL clients), you can use the [React `cache` function](#react-cache-function) to memoize functions. ### [Duration](#duration) The cache lasts the lifetime of a server request until the React component tree has finished rendering. ### [Revalidating](#revalidating) Since the memoization is not shared across server requests and only applies during rendering, there is no need to revalidate it. ### [Opting out](#opting-out) Memoization only applies to the `GET` method in `fetch` requests, other methods, such as `POST` and `DELETE`, are not memoized. This default behavior is a React optimization and we do not recommend opting out of it. To manage individual requests, you can use the [`signal`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController/signal) property from [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController). However, this will not opt requests out of memoization, rather, abort in-flight requests. app/example.js const { signal } = new AbortController() fetch(url, { signal }) [Data Cache](#data-cache) ------------------------- Next.js has a built-in Data Cache that **persists** the result of data fetches across incoming **server requests** and **deployments**. This is possible because Next.js extends the native `fetch` API to allow each request on the server to set its own persistent caching semantics. > **Good to know**: In the browser, the `cache` option of `fetch` indicates how a request will interact with the browser's HTTP cache, in Next.js, the `cache` option indicates how a server-side request will interact with the server's Data Cache. By default, data requests that use `fetch` are **cached**. You can use the [`cache`](#fetch-optionscache) and [`next.revalidate`](#fetch-optionsnextrevalidate) options of `fetch` to configure the caching behavior. **How the Data Cache Works**  * The first time a `fetch` request is called during rendering, Next.js checks the Data Cache for a cached response. * If a cached response is found, it's returned immediately and [memoized](#request-memoization). * If a cached response is not found, the request is made to the data source, the result is stored in the Data Cache, and memoized. * For uncached data (e.g. `{ cache: 'no-store' }`), the result is always fetched from the data source, and memoized. * Whether the data is cached or uncached, the requests are always memoized to avoid making duplicate requests for the same data during a React render pass. > **Differences between the Data Cache and Request Memoization** > > While both caching mechanisms help improve performance by re-using cached data, the Data Cache is persistent across incoming requests and deployments, whereas memoization only lasts the lifetime of a request. > > With memoization, we reduce the number of **duplicate** requests in the same render pass that have to cross the network boundary from the rendering server to the Data Cache server (e.g. a CDN or Edge Network) or data source (e.g. a database or CMS). With the Data Cache, we reduce the number of requests made to our origin data source. ### [Duration](#duration-1) The Data Cache is persistent across incoming requests and deployments unless you revalidate or opt-out. ### [Revalidating](#revalidating-1) Cached data can be revalidated in two ways, with: * **Time-based Revalidation**: Revalidate data after a certain amount of time has passed and a new request is made. This is useful for data that changes infrequently and freshness is not as critical. * **On-demand Revalidation:** Revalidate data based on an event (e.g. form submission). On-demand revalidation can use a tag-based or path-based approach to revalidate groups of data at once. This is useful when you want to ensure the latest data is shown as soon as possible (e.g. when content from your headless CMS is updated). #### [Time-based Revalidation](#time-based-revalidation) To revalidate data at a timed interval, you can use the `next.revalidate` option of `fetch` to set the cache lifetime of a resource (in seconds). // Revalidate at most every hour fetch('https://...', { next: { revalidate: 3600 } }) Alternatively, you can use [Route Segment Config options](#segment-config-options) to configure all `fetch` requests in a segment or for cases where you're not able to use `fetch`. **How Time-based Revalidation Works**  * The first time a fetch request with `revalidate` is called, the data will be fetched from the external data source and stored in the Data Cache. * Any requests that are called within the specified timeframe (e.g. 60-seconds) will return the cached data. * After the timeframe, the next request will still return the cached (now stale) data. * Next.js will trigger a revalidation of the data in the background. * Once the data is fetched successfully, Next.js will update the Data Cache with the fresh data. * If the background revalidation fails, the previous data will be kept unaltered. This is similar to [**stale-while-revalidate**](https://web.dev/stale-while-revalidate/) behavior. #### [On-demand Revalidation](#on-demand-revalidation) Data can be revalidated on-demand by path ([`revalidatePath`](#revalidatepath)) or by cache tag ([`revalidateTag`](#fetch-optionsnexttags-and-revalidatetag)). **How On-Demand Revalidation Works**  * The first time a `fetch` request is called, the data will be fetched from the external data source and stored in the Data Cache. * When an on-demand revalidation is triggered, the appropriate cache entries will be purged from the cache. * This is different from time-based revalidation, which keeps the stale data in the cache until the fresh data is fetched. * The next time a request is made, it will be a cache `MISS` again, and the data will be fetched from the external data source and stored in the Data Cache. ### [Opting out](#opting-out-1) For individual data fetches, you can opt out of caching by setting the [`cache`](#fetch-optionscache) option to `no-store`. This means data will be fetched whenever `fetch` is called. // Opt out of caching for an individual `fetch` request fetch(`https://...`, { cache: 'no-store' }) Alternatively, you can also use the [Route Segment Config options](#segment-config-options) to opt out of caching for a specific route segment. This will affect all data requests in the route segment, including third-party libraries. // Opt out of caching for all data requests in the route segment export const dynamic = 'force-dynamic' > **Note**: Data Cache is currently only available in pages/routes, not middleware. Any fetches done inside of your middleware will be uncached by default. > **Vercel Data Cache** > > If your Next.js application is deployed to Vercel, we recommend reading the [Vercel Data Cache](https://vercel.com/docs/infrastructure/data-cache) documentation for a better understanding of Vercel specific features. [Full Route Cache](#full-route-cache) ------------------------------------- > **Related terms**: > > You may see the terms **Automatic Static Optimization**, **Static Site Generation**, or **Static Rendering** being used interchangeably to refer to the process of rendering and caching routes of your application at build time. Next.js automatically renders and caches routes at build time. This is an optimization that allows you to serve the cached route instead of rendering on the server for every request, resulting in faster page loads. To understand how the Full Route Cache works, it's helpful to look at how React handles rendering, and how Next.js caches the result: ### [1\. React Rendering on the Server](#1-react-rendering-on-the-server) On the server, Next.js uses React's APIs to orchestrate rendering. The rendering work is split into chunks: by individual routes segments and Suspense boundaries. Each chunk is rendered in two steps: 1. React renders Server Components into a special data format, optimized for streaming, called the **React Server Component Payload**. 2. Next.js uses the React Server Component Payload and Client Component JavaScript instructions to render **HTML** on the server. This means we don't have to wait for everything to render before caching the work or sending a response. Instead, we can stream a response as work is completed. > **What is the React Server Component Payload?** > > The React Server Component Payload is a compact binary representation of the rendered React Server Components tree. It's used by React on the client to update the browser's DOM. The React Server Component Payload contains: > > * The rendered result of Server Components > * Placeholders for where Client Components should be rendered and references to their JavaScript files > * Any props passed from a Server Component to a Client Component > > To learn more, see the [Server Components](/docs/app/building-your-application/rendering/server-components) documentation. ### [2\. Next.js Caching on the Server (Full Route Cache)](#2-nextjs-caching-on-the-server-full-route-cache)  The default behavior of Next.js is to cache the rendered result (React Server Component Payload and HTML) of a route on the server. This applies to statically rendered routes at build time, or during revalidation. ### [3\. React Hydration and Reconciliation on the Client](#3-react-hydration-and-reconciliation-on-the-client) At request time, on the client: 1. The HTML is used to immediately show a fast non-interactive initial preview of the Client and Server Components. 2. The React Server Components Payload is used to reconcile the Client and rendered Server Component trees, and update the DOM. 3. The JavaScript instructions are used to [hydrate](https://react.dev/reference/react-dom/client/hydrateRoot) Client Components and make the application interactive. ### [4\. Next.js Caching on the Client (Router Cache)](#4-nextjs-caching-on-the-client-router-cache) The React Server Component Payload is stored in the client-side [Router Cache](#router-cache) - a separate in-memory cache, split by individual route segment. This Router Cache is used to improve the navigation experience by storing previously visited routes and prefetching future routes. ### [5\. Subsequent Navigations](#5-subsequent-navigations) On subsequent navigations or during prefetching, Next.js will check if the React Server Components Payload is stored in the Router Cache. If so, it will skip sending a new request to the server. If the route segments are not in the cache, Next.js will fetch the React Server Components Payload from the server, and populate the Router Cache on the client. ### [Static and Dynamic Rendering](#static-and-dynamic-rendering) Whether a route is cached or not at build time depends on whether it's statically or dynamically rendered. Static routes are cached by default, whereas dynamic routes are rendered at request time, and not cached. This diagram shows the difference between statically and dynamically rendered routes, with cached and uncached data:  Learn more about [static and dynamic rendering](/docs/app/building-your-application/rendering/server-components#server-rendering-strategies). ### [Duration](#duration-2) By default, the Full Route Cache is persistent. This means that the render output is cached across user requests. ### [Invalidation](#invalidation) There are two ways you can invalidate the Full Route Cache: * **[Revalidating Data](/docs/app/building-your-application/caching#revalidating)**: Revalidating the [Data Cache](#data-cache), will in turn invalidate the Router Cache by re-rendering components on the server and caching the new render output. * **Redeploying**: Unlike the Data Cache, which persists across deployments, the Full Route Cache is cleared on new deployments. ### [Opting out](#opting-out-2) You can opt out of the Full Route Cache, or in other words, dynamically render components for every incoming request, by: * **Using a [Dynamic Function](#dynamic-functions)**: This will opt the route out from the Full Route Cache and dynamically render it at request time. The Data Cache can still be used. * **Using the `dynamic = 'force-dynamic'` or `revalidate = 0` route segment config options**: This will skip the Full Route Cache and the Data Cache. Meaning components will be rendered and data fetched on every incoming request to the server. The Router Cache will still apply as it's a client-side cache. * **Opting out of the [Data Cache](#data-cache)**: If a route has a `fetch` request that is not cached, this will opt the route out of the Full Route Cache. The data for the specific `fetch` request will be fetched for every incoming request. Other `fetch` requests that do not opt out of caching will still be cached in the Data Cache. This allows for a hybrid of cached and uncached data. [Router Cache](#router-cache) ----------------------------- > **Related Terms:** > > You may see the Router Cache being referred to as **Client-side Cache** or **Prefetch Cache**. While **Prefetch Cache** refers to the prefetched route segments, **Client-side Cache** refers to the whole Router cache, which includes both visited and prefetched segments. This cache specifically applies to Next.js and Server Components, and is different to the browser's [bfcache](https://web.dev/bfcache/), though it has a similar result. Next.js has an in-memory client-side cache that stores the React Server Component Payload, split by individual route segments, for the duration of a user session. This is called the Router Cache. **How the Router Cache Works**  As a user navigates between routes, Next.js caches visited route segments and [prefetches](/docs/app/building-your-application/routing/linking-and-navigating#2-prefetching) the routes the user is likely to navigate to (based on `<Link>` components in their viewport). This results in an improved navigation experience for the user: * Instant backward/forward navigation because visited routes are cached and fast navigation to new routes because of prefetching and [partial rendering](/docs/app/building-your-application/routing/linking-and-navigating#4-partial-rendering). * No full-page reload between navigations, and React state and browser state are preserved. > **Difference between the Router Cache and Full Route Cache**: > > The Router Cache temporarily stores the React Server Component Payload in the browser for the duration of a user session, whereas the Full Route Cache persistently stores the React Server Component Payload and HTML on the server across multiple user requests. > > While the Full Route Cache only caches statically rendered routes, the Router Cache applies to both statically and dynamically rendered routes. ### [Duration](#duration-3) The cache is stored in the browser's temporary memory. Two factors determine how long the router cache lasts: * **Session**: The cache persists across navigation. However, it's cleared on page refresh. * **Automatic Invalidation Period**: The cache of an individual segment is automatically invalidated after a specific time. The duration depends on how the resource was [prefetched](/docs/app/api-reference/components/link#prefetch): * **Default Prefetching** (`prefetch={null}` or unspecified): 30 seconds * **Full Prefetching**: (`prefetch={true}` or `router.prefetch`): 5 minutes While a page refresh will clear **all** cached segments, the automatic invalidation period only affects the individual segment from the time it was prefetched. > **Note**: There is [experimental support](/docs/app/api-reference/next-config-js/staleTimes) for configuring these values as of v14.2.0-canary.53. ### [Invalidation](#invalidation-1) There are two ways you can invalidate the Router Cache: * In a **Server Action**: * Revalidating data on-demand by path with ([`revalidatePath`](/docs/app/api-reference/functions/revalidatePath)) or by cache tag with ([`revalidateTag`](/docs/app/api-reference/functions/revalidateTag)) * Using [`cookies.set`](/docs/app/api-reference/functions/cookies#cookiessetname-value-options) or [`cookies.delete`](/docs/app/api-reference/functions/cookies#deleting-cookies) invalidates the Router Cache to prevent routes that use cookies from becoming stale (e.g. authentication). * Calling [`router.refresh`](/docs/app/api-reference/functions/use-router) will invalidate the Router Cache and make a new request to the server for the current route. ### [Opting out](#opting-out-3) It's not possible to opt out of the Router Cache. However, you can invalidate it by calling [`router.refresh`](/docs/app/api-reference/functions/use-router), [`revalidatePath`](/docs/app/api-reference/functions/revalidatePath), or [`revalidateTag`](/docs/app/api-reference/functions/revalidateTag) (see above). This will clear the cache and make a new request to the server, ensuring the latest data is shown. You can also opt out of **prefetching** by setting the `prefetch` prop of the `<Link>` component to `false`. However, this will still temporarily store the route segments for 30s to allow instant navigation between nested segments, such as tab bars, or back and forward navigation. Visited routes will still be cached. [Cache Interactions](#cache-interactions) ----------------------------------------- When configuring the different caching mechanisms, it's important to understand how they interact with each other: ### [Data Cache and Full Route Cache](#data-cache-and-full-route-cache) * Revalidating or opting out of the Data Cache **will** invalidate the Full Route Cache, as the render output depends on data. * Invalidating or opting out of the Full Route Cache **does not** affect the Data Cache. You can dynamically render a route that has both cached and uncached data. This is useful when most of your page uses cached data, but you have a few components that rely on data that needs to be fetched at request time. You can dynamically render without worrying about the performance impact of re-fetching all the data. ### [Data Cache and Client-side Router cache](#data-cache-and-client-side-router-cache) * Revalidating the Data Cache in a [Route Handler](/docs/app/building-your-application/routing/route-handlers) **will not** immediately invalidate the Router Cache as the Route Handler isn't tied to a specific route. This means Router Cache will continue to serve the previous payload until a hard refresh, or the automatic invalidation period has elapsed. * To immediately invalidate the Data Cache and Router cache, you can use [`revalidatePath`](#revalidatepath) or [`revalidateTag`](#fetch-optionsnexttags-and-revalidatetag) in a [Server Action](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). [APIs](#apis) ------------- The following table provides an overview of how different Next.js APIs affect caching: API Router Cache Full Route Cache Data Cache React Cache [`<Link prefetch>`](#link) Cache [`router.prefetch`](#routerprefetch) Cache [`router.refresh`](#routerrefresh) Revalidate [`fetch`](#fetch) Cache Cache [`fetch` `options.cache`](#fetch-optionscache) Cache or Opt out [`fetch` `options.next.revalidate`](#fetch-optionsnextrevalidate) Revalidate Revalidate [`fetch` `options.next.tags`](#fetch-optionsnexttags-and-revalidatetag) Cache Cache [`revalidateTag`](#fetch-optionsnexttags-and-revalidatetag) Revalidate (Server Action) Revalidate Revalidate [`revalidatePath`](#revalidatepath) Revalidate (Server Action) Revalidate Revalidate [`const revalidate`](#segment-config-options) Revalidate or Opt out Revalidate or Opt out [`const dynamic`](#segment-config-options) Cache or Opt out Cache or Opt out [`cookies`](#cookies) Revalidate (Server Action) Opt out [`headers`, `searchParams`](#dynamic-functions) Opt out [`generateStaticParams`](#generatestaticparams) Cache [`React.cache`](#react-cache-function) Cache [`unstable_cache`](/docs/app/api-reference/functions/unstable_cache) ### [`<Link>`](#link) By default, the `<Link>` component automatically prefetches routes from the Full Route Cache and adds the React Server Component Payload to the Router Cache. To disable prefetching, you can set the `prefetch` prop to `false`. But this will not skip the cache permanently, the route segment will still be cached client-side when the user visits the route. Learn more about the [`<Link>` component](/docs/app/api-reference/components/link). ### [`router.prefetch`](#routerprefetch) The `prefetch` option of the `useRouter` hook can be used to manually prefetch a route. This adds the React Server Component Payload to the Router Cache. See the [`useRouter` hook](/docs/app/api-reference/functions/use-router) API reference. ### [`router.refresh`](#routerrefresh) The `refresh` option of the `useRouter` hook can be used to manually refresh a route. This completely clears the Router Cache, and makes a new request to the server for the current route. `refresh` does not affect the Data or Full Route Cache. The rendered result will be reconciled on the client while preserving React state and browser state. See the [`useRouter` hook](/docs/app/api-reference/functions/use-router) API reference. ### [`fetch`](#fetch) Data returned from `fetch` is automatically cached in the Data Cache. // Cached by default. `force-cache` is the default option and can be omitted. fetch(`https://...`, { cache: 'force-cache' }) See the [`fetch` API Reference](/docs/app/api-reference/functions/fetch) for more options. ### [`fetch options.cache`](#fetch-optionscache) You can opt out individual `fetch` requests of data caching by setting the `cache` option to `no-store`: // Opt out of caching fetch(`https://...`, { cache: 'no-store' }) Since the render output depends on data, using `cache: 'no-store'` will also skip the Full Route Cache for the route where the `fetch` request is used. That is, the route will be dynamically rendered every request, but you can still have other cached data requests in the same route. See the [`fetch` API Reference](/docs/app/api-reference/functions/fetch) for more options. ### [`fetch options.next.revalidate`](#fetch-optionsnextrevalidate) You can use the `next.revalidate` option of `fetch` to set the revalidation period (in seconds) of an individual `fetch` request. This will revalidate the Data Cache, which in turn will revalidate the Full Route Cache. Fresh data will be fetched, and components will be re-rendered on the server. // Revalidate at most after 1 hour fetch(`https://...`, { next: { revalidate: 3600 } }) See the [`fetch` API reference](/docs/app/api-reference/functions/fetch) for more options. ### [`fetch options.next.tags` and `revalidateTag`](#fetch-optionsnexttags-and-revalidatetag) Next.js has a cache tagging system for fine-grained data caching and revalidation. 1. When using `fetch` or [`unstable_cache`](/docs/app/api-reference/functions/unstable_cache), you have the option to tag cache entries with one or more tags. 2. Then, you can call `revalidateTag` to purge the cache entries associated with that tag. For example, you can set a tag when fetching data: // Cache data with a tag fetch(`https://...`, { next: { tags: ['a', 'b', 'c'] } }) Then, call `revalidateTag` with a tag to purge the cache entry: // Revalidate entries with a specific tag revalidateTag('a') There are two places you can use `revalidateTag`, depending on what you're trying to achieve: 1. [Route Handlers](/docs/app/building-your-application/routing/route-handlers) - to revalidate data in response of a third party event (e.g. webhook). This will not invalidate the Router Cache immediately as the Router Handler isn't tied to a specific route. 2. [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) - to revalidate data after a user action (e.g. form submission). This will invalidate the Router Cache for the associated route. ### [`revalidatePath`](#revalidatepath) `revalidatePath` allows you manually revalidate data **and** re-render the route segments below a specific path in a single operation. Calling the `revalidatePath` method revalidates the Data Cache, which in turn invalidates the Full Route Cache. revalidatePath('/') There are two places you can use `revalidatePath`, depending on what you're trying to achieve: 1. [Route Handlers](/docs/app/building-your-application/routing/route-handlers) - to revalidate data in response to a third party event (e.g. webhook). 2. [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations) - to revalidate data after a user interaction (e.g. form submission, clicking a button). See the [`revalidatePath` API reference](/docs/app/api-reference/functions/revalidatePath) for more information. > **`revalidatePath`** vs. **`router.refresh`**: > > Calling `router.refresh` will clear the Router cache, and re-render route segments on the server without invalidating the Data Cache or the Full Route Cache. > > The difference is that `revalidatePath` purges the Data Cache and Full Route Cache, whereas `router.refresh()` does not change the Data Cache and Full Route Cache, as it is a client-side API. ### [Dynamic Functions](#dynamic-functions) Dynamic functions like `cookies` and `headers`, and the `searchParams` prop in Pages depend on runtime incoming request information. Using them will opt a route out of the Full Route Cache, in other words, the route will be dynamically rendered. #### [`cookies`](#cookies) Using `cookies.set` or `cookies.delete` in a Server Action invalidates the Router Cache to prevent routes that use cookies from becoming stale (e.g. to reflect authentication changes). See the [`cookies`](/docs/app/api-reference/functions/cookies) API reference. ### [Segment Config Options](#segment-config-options) The Route Segment Config options can be used to override the route segment defaults or when you're not able to use the `fetch` API (e.g. database client or 3rd party libraries). The following Route Segment Config options will opt out of the Data Cache and Full Route Cache: * `const dynamic = 'force-dynamic'` * `const revalidate = 0` See the [Route Segment Config](/docs/app/api-reference/file-conventions/route-segment-config) documentation for more options. ### [`generateStaticParams`](#generatestaticparams) For [dynamic segments](/docs/app/building-your-application/routing/dynamic-routes) (e.g. `app/blog/[slug]/page.js`), paths provided by `generateStaticParams` are cached in the Full Route Cache at build time. At request time, Next.js will also cache paths that weren't known at build time the first time they're visited. You can disable caching at request time by using `export const dynamicParams = false` option in a route segment. When this config option is used, only paths provided by `generateStaticParams` will be served, and other routes will 404 or match (in the case of [catch-all routes](/docs/app/building-your-application/routing/dynamic-routes#catch-all-segments)). See the [`generateStaticParams` API reference](/docs/app/api-reference/functions/generate-static-params). ### [React `cache` function](#react-cache-function) The React `cache` function allows you to memoize the return value of a function, allowing you to call the same function multiple times while only executing it once. Since `fetch` requests are automatically memoized, you do not need to wrap it in React `cache`. However, you can use `cache` to manually memoize data requests for use cases when the `fetch` API is not suitable. For example, some database clients, CMS clients, or GraphQL clients. utils/get-item.ts TypeScript JavaScriptTypeScript import { cache } from 'react' import db from '@/lib/db' export const getItem = cache(async (id: string) => { const item = await db.item.findUnique({ id }) return item }) [Previous Edge and Node.js Runtimes ](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) [Next Styling ](/docs/app/building-your-application/styling) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Parameters](#parameters) * [params (optional)](#params-optional) * [Returns](#returns) * [Examples](#examples) * [Using external data](#using-external-data) * [Version History](#version-history) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/generate-image-metadata.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)generateImageMetadata generateImageMetadata ===================== You can use `generateImageMetadata` to generate different versions of one image or return multiple images for one route segment. This is useful for when you want to avoid hard-coding metadata values, such as for icons. [Parameters](#parameters) ------------------------- `generateImageMetadata` function accepts the following parameters: #### [`params` (optional)](#params-optional) An object containing the [dynamic route parameters](/docs/app/building-your-application/routing/dynamic-routes) object from the root segment down to the segment `generateImageMetadata` is called from. icon.tsx TypeScript JavaScriptTypeScript export function generateImageMetadata({ params, }: { params: { slug: string } }) { // ... } Route URL `params` `app/shop/icon.js` `/shop` `undefined` `app/shop/[slug]/icon.js` `/shop/1` `{ slug: '1' }` `app/shop/[tag]/[item]/icon.js` `/shop/1/2` `{ tag: '1', item: '2' }` `app/shop/[...slug]/icon.js` `/shop/1/2` `{ slug: ['1', '2'] }` [Returns](#returns) ------------------- The `generateImageMetadata` function should return an `array` of objects containing the image's metadata such as `alt` and `size`. In addition, each item **must** include an `id` value which will be passed to the props of the image generating function. Image Metadata Object Type `id` `string` (required) `alt` `string` `size` `{ width: number; height: number }` `contentType` `string` icon.tsx TypeScript JavaScriptTypeScript import { ImageResponse } from 'next/og' export function generateImageMetadata() { return [ { contentType: 'image/png', size: { width: 48, height: 48 }, id: 'small', }, { contentType: 'image/png', size: { width: 72, height: 72 }, id: 'medium', }, ] } export default function Icon({ id }: { id: string }) { return new ImageResponse( ( <div style={{ width: '100%', height: '100%', display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: 88, background: '#000', color: '#fafafa', }} > Icon {id} </div> ) ) } ### [Examples](#examples) #### [Using external data](#using-external-data) This example uses the `params` object and external data to generate multiple [Open Graph images](/docs/app/api-reference/file-conventions/metadata/opengraph-image) for a route segment. app/products/\[id\]/opengraph-image.tsx TypeScript JavaScriptTypeScript import { ImageResponse } from 'next/og' import { getCaptionForImage, getOGImages } from '@/app/utils/images' export async function generateImageMetadata({ params, }: { params: { id: string } }) { const images = await getOGImages(params.id) return images.map((image, idx) => ({ id: idx, size: { width: 1200, height: 600 }, alt: image.text, contentType: 'image/png', })) } export default async function Image({ params, id, }: { params: { id: string } id: number }) { const productId = params.id const imageId = id const text = await getCaptionForImage(productId, imageId) return new ImageResponse( ( <div style={ { // ... } } > {text} </div> ) ) } [Version History](#version-history) ----------------------------------- Version Changes `v13.3.0` `generateImageMetadata` introduced. Next Steps ---------- View all the Metadata API options. [ App Router ... File Conventions ### Metadata Files API documentation for the metadata file conventions. ](/docs/app/api-reference/file-conventions/metadata)[ App Router ... Optimizing ### Metadata Use the Metadata API to define metadata in any layout or page. ](/docs/app/building-your-application/optimizing/metadata) [Previous fetch ](/docs/app/api-reference/functions/fetch) [Next generateMetadata ](/docs/app/api-reference/functions/generate-metadata) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [fetch(url, options)](#fetchurl-options) * [options.cache](#optionscache) * [options.next.revalidate](#optionsnextrevalidate) * [options.next.tags](#optionsnexttags) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/fetch.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)fetch fetch ===== Next.js extends the native [Web `fetch()` API](https://developer.mozilla.org/docs/Web/API/Fetch_API) to allow each request on the server to set its own persistent caching semantics. In the browser, the `cache` option indicates how a fetch request will interact with the _browser's_ HTTP cache. With this extension, `cache` indicates how a _server-side_ fetch request will interact with the framework's persistent HTTP cache. You can call `fetch` with `async` and `await` directly within Server Components. app/page.tsx TypeScript JavaScriptTypeScript export default async function Page() { // This request should be cached until manually invalidated. // Similar to `getStaticProps`. // `force-cache` is the default and can be omitted. const staticData = await fetch(`https://...`, { cache: 'force-cache' }) // This request should be refetched on every request. // Similar to `getServerSideProps`. const dynamicData = await fetch(`https://...`, { cache: 'no-store' }) // This request should be cached with a lifetime of 10 seconds. // Similar to `getStaticProps` with the `revalidate` option. const revalidatedData = await fetch(`https://...`, { next: { revalidate: 10 }, }) return <div>...</div> } [`fetch(url, options)`](#fetchurl-options) ------------------------------------------ Since Next.js extends the [Web `fetch()` API](https://developer.mozilla.org/docs/Web/API/Fetch_API), you can use any of the [native options available](https://developer.mozilla.org/docs/Web/API/fetch#parameters). ### [`options.cache`](#optionscache) Configure how the request should interact with Next.js [Data Cache](/docs/app/building-your-application/caching#data-cache). fetch(`https://...`, { cache: 'force-cache' | 'no-store' }) * **`force-cache`** (default) - Next.js looks for a matching request in its Data Cache. * If there is a match and it is fresh, it will be returned from the cache. * If there is no match or a stale match, Next.js will fetch the resource from the remote server and update the cache with the downloaded resource. * **`no-store`** - Next.js fetches the resource from the remote server on every request without looking in the cache, and it will not update the cache with the downloaded resource. > **Good to know**: > > * If you don't provide a `cache` option, Next.js will default to `force-cache`, unless a [dynamic function](/docs/app/building-your-application/rendering/server-components#server-rendering-strategies#dynamic-functions) such as `cookies()` is used, in which case it will default to `no-store`. > * The `no-cache` option behaves the same way as `no-store` in Next.js. ### [`options.next.revalidate`](#optionsnextrevalidate) fetch(`https://...`, { next: { revalidate: false | 0 | number } }) Set the cache lifetime of a resource (in seconds). * **`false`** - Cache the resource indefinitely. Semantically equivalent to `revalidate: Infinity`. The HTTP cache may evict older resources over time. * **`0`** - Prevent the resource from being cached. * **`number`** - (in seconds) Specify the resource should have a cache lifetime of at most `n` seconds. > **Good to know**: > > * If an individual `fetch()` request sets a `revalidate` number lower than the [default `revalidate`](/docs/app/api-reference/file-conventions/route-segment-config#revalidate) of a route, the whole route revalidation interval will be decreased. > * If two fetch requests with the same URL in the same route have different `revalidate` values, the lower value will be used. > * As a convenience, it is not necessary to set the `cache` option if `revalidate` is set to a number since `0` implies `cache: 'no-store'` and a positive value implies `cache: 'force-cache'`. > * Conflicting options such as `{ revalidate: 0, cache: 'force-cache' }` or `{ revalidate: 10, cache: 'no-store' }` will cause an error. ### [`options.next.tags`](#optionsnexttags) fetch(`https://...`, { next: { tags: ['collection'] } }) Set the cache tags of a resource. Data can then be revalidated on-demand using [`revalidateTag`](https://nextjs.org/docs/app/api-reference/functions/revalidateTag). The max length for a custom tag is 256 characters and the max tag items is 64. [Version History](#version-history) ----------------------------------- Version Changes `v13.0.0` `fetch` introduced. [Previous draftMode ](/docs/app/api-reference/functions/draft-mode) [Next generateImageMetadata ](/docs/app/api-reference/functions/generate-image-metadata) Was this helpful? supported. Send

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[generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Terminology](#terminology) * [The app Router](#the-app-router) * [Roles of Folders and Files](#roles-of-folders-and-files) * [Route Segments](#route-segments) * [Nested Routes](#nested-routes) * [File Conventions](#file-conventions) * [Component Hierarchy](#component-hierarchy) * [Colocation](#colocation) * [Advanced Routing Patterns](#advanced-routing-patterns) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[Building Your Application](/docs/app/building-your-application)Routing Routing Fundamentals ==================== The skeleton of every application is routing. This page will introduce you to the **fundamental concepts** of routing for the web and how to handle routing in Next.js. [Terminology](#terminology) --------------------------- First, you will see these terms being used throughout the documentation. Here's a quick reference:  * **Tree:** A convention for visualizing a hierarchical structure. For example, a component tree with parent and children components, a folder structure, etc. * **Subtree:** Part of a tree, starting at a new root (first) and ending at the leaves (last). * **Root**: The first node in a tree or subtree, such as a root layout. * **Leaf:** Nodes in a subtree that have no children, such as the last segment in a URL path.  * **URL Segment:** Part of the URL path delimited by slashes. * **URL Path:** Part of the URL that comes after the domain (composed of segments). [The `app` Router](#the-app-router) ----------------------------------- In version 13, Next.js introduced a new **App Router** built on [React Server Components](/docs/app/building-your-application/rendering/server-components), which supports shared layouts, nested routing, loading states, error handling, and more. The App Router works in a new directory named `app`. The `app` directory works alongside the `pages` directory to allow for incremental adoption. This allows you to opt some routes of your application into the new behavior while keeping other routes in the `pages` directory for previous behavior. If your application uses the `pages` directory, please also see the [Pages Router](/docs/pages/building-your-application/routing) documentation. > **Good to know**: The App Router takes priority over the Pages Router. Routes across directories should not resolve to the same URL path and will cause a build-time error to prevent a conflict.  By default, components inside `app` are [React Server Components](/docs/app/building-your-application/rendering/server-components). This is a performance optimization and allows you to easily adopt them, and you can also use [Client Components](/docs/app/building-your-application/rendering/client-components). > **Recommendation:** Check out the [Server](/docs/app/building-your-application/rendering/server-components) page if you're new to Server Components. [Roles of Folders and Files](#roles-of-folders-and-files) --------------------------------------------------------- Next.js uses a file-system based router where: * **Folders** are used to define routes. A route is a single path of nested folders, following the file-system hierarchy from the **root folder** down to a final **leaf folder** that includes a `page.js` file. See [Defining Routes](/docs/app/building-your-application/routing/defining-routes). * **Files** are used to create UI that is shown for a route segment. See [special files](#file-conventions). [Route Segments](#route-segments) --------------------------------- Each folder in a route represents a **route segment**. Each route segment is mapped to a corresponding **segment** in a **URL path**.  [Nested Routes](#nested-routes) ------------------------------- To create a nested route, you can nest folders inside each other. For example, you can add a new `/dashboard/settings` route by nesting two new folders in the `app` directory. The `/dashboard/settings` route is composed of three segments: * `/` (Root segment) * `dashboard` (Segment) * `settings` (Leaf segment) [File Conventions](#file-conventions) ------------------------------------- Next.js provides a set of special files to create UI with specific behavior in nested routes: [`layout`](/docs/app/building-your-application/routing/pages-and-layouts#layouts) Shared UI for a segment and its children [`page`](/docs/app/building-your-application/routing/pages-and-layouts#pages) Unique UI of a route and make routes publicly accessible [`loading`](/docs/app/building-your-application/routing/loading-ui-and-streaming) Loading UI for a segment and its children [`not-found`](/docs/app/api-reference/file-conventions/not-found) Not found UI for a segment and its children [`error`](/docs/app/building-your-application/routing/error-handling) Error UI for a segment and its children [`global-error`](/docs/app/building-your-application/routing/error-handling) Global Error UI [`route`](/docs/app/building-your-application/routing/route-handlers) Server-side API endpoint [`template`](/docs/app/building-your-application/routing/pages-and-layouts#templates) Specialized re-rendered Layout UI [`default`](/docs/app/api-reference/file-conventions/default) Fallback UI for [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes) > **Good to know**: `.js`, `.jsx`, or `.tsx` file extensions can be used for special files. [Component Hierarchy](#component-hierarchy) ------------------------------------------- The React components defined in special files of a route segment are rendered in a specific hierarchy: * `layout.js` * `template.js` * `error.js` (React error boundary) * `loading.js` (React suspense boundary) * `not-found.js` (React error boundary) * `page.js` or nested `layout.js`  In a nested route, the components of a segment will be nested **inside** the components of its parent segment.  [Colocation](#colocation) ------------------------- In addition to special files, you have the option to colocate your own files (e.g. components, styles, tests, etc) inside folders in the `app` directory. This is because while folders define routes, only the contents returned by `page.js` or `route.js` are publicly addressable.  Learn more about [Project Organization and Colocation](/docs/app/building-your-application/routing/colocation). [Advanced Routing Patterns](#advanced-routing-patterns) ------------------------------------------------------- The App Router also provides a set of conventions to help you implement more advanced routing patterns. These include: * [Parallel Routes](/docs/app/building-your-application/routing/parallel-routes): Allow you to simultaneously show two or more pages in the same view that can be navigated independently. You can use them for split views that have their own sub-navigation. E.g. Dashboards. * [Intercepting Routes](/docs/app/building-your-application/routing/intercepting-routes): Allow you to intercept a route and show it in the context of another route. You can use these when keeping the context for the current page is important. E.g. Seeing all tasks while editing one task or expanding a photo in a feed. These patterns allow you to build richer and more complex UIs, democratizing features that were historically complex for small teams and individual developers to implement. [Next Steps](#next-steps) ------------------------- Now that you understand the fundamentals of routing in Next.js, follow the links below to create your first routes: [ ### Defining Routes Learn how to create your first route in Next.js. ](/docs/app/building-your-application/routing/defining-routes)[ ### Pages and Layouts Create your first page and shared layout with the App Router. ](/docs/app/building-your-application/routing/pages-and-layouts)[ ### Linking and Navigating Learn how navigation works in Next.js, and how to use the Link Component and \`useRouter\` hook. ](/docs/app/building-your-application/routing/linking-and-navigating)[ ### Loading UI and Streaming Built on top of Suspense, Loading UI allows you to create a fallback for specific route segments, and automatically stream content as it becomes ready. ](/docs/app/building-your-application/routing/loading-ui-and-streaming)[ ### Error Handling Handle runtime errors by automatically wrapping route segments and their nested children in a React Error Boundary. ](/docs/app/building-your-application/routing/error-handling)[ ### Redirecting Learn the different ways to handle redirects in Next.js. ](/docs/app/building-your-application/routing/redirecting)[ ### Route Groups Route Groups can be used to partition your Next.js application into different sections. ](/docs/app/building-your-application/routing/route-groups)[ ### Project Organization Learn how to organize your Next.js project and colocate files. ](/docs/app/building-your-application/routing/colocation)[ ### Dynamic Routes Dynamic Routes can be used to programmatically generate route segments from dynamic data. ](/docs/app/building-your-application/routing/dynamic-routes)[ ### Parallel Routes Simultaneously render one or more pages in the same view that can be navigated independently. A pattern for highly dynamic applications. ](/docs/app/building-your-application/routing/parallel-routes)[ ### Intercepting Routes Use intercepting routes to load a new route within the current layout while masking the browser URL, useful for advanced routing patterns such as modals. ](/docs/app/building-your-application/routing/intercepting-routes)[ ### Route Handlers Create custom request handlers for a given route using the Web's Request and Response APIs. ](/docs/app/building-your-application/routing/route-handlers)[ ### Middleware Learn how to use Middleware to run code before a request is completed. ](/docs/app/building-your-application/routing/middleware)[ ### Internationalization Add support for multiple languages with internationalized routing and localized content. ](/docs/app/building-your-application/routing/internationalization) [Previous Building Your Application ](/docs/app/building-your-application) [Next Defining Routes ](/docs/app/building-your-application/routing/defining-routes) Was this helpful? supported. 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[reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Runtime Differences](#runtime-differences) * [Edge Runtime](#edge-runtime) * [Node.js Runtime](#nodejs-runtime) * [Serverless Node.js](#serverless-nodejs) * [Examples](#examples) * [Segment Runtime Option](#segment-runtime-option) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/03-rendering/04-edge-and-nodejs-runtimes.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Rendering](/docs/app/building-your-application/rendering)Edge and Node.js Runtimes Edge and Node.js Runtimes ========================= In the context of Next.js, runtime refers to the set of libraries, APIs, and general functionality available to your code during execution. On the server, there are two runtimes where parts of your application code can be rendered: * The **Node.js Runtime** (default) has access to all Node.js APIs and compatible packages from the ecosystem. * The **Edge Runtime** is based on [Web APIs](/docs/app/api-reference/edge). [Runtime Differences](#runtime-differences) ------------------------------------------- There are many considerations to make when choosing a runtime. This table shows the major differences at a glance. If you want a more in-depth analysis of the differences, check out the sections below. Node Serverless Edge Cold Boot / Normal Low [HTTP Streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) Yes Yes Yes IO All All `fetch` Scalability / High Highest Security Normal High High Latency Normal Low Lowest npm Packages All All A smaller subset [Static Rendering](/docs/app/building-your-application/rendering/server-components#static-rendering-default) Yes Yes No [Dynamic Rendering](/docs/app/building-your-application/rendering/server-components#dynamic-rendering) Yes Yes Yes [Data Revalidation w/ `fetch`](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#revalidating-data) Yes Yes Yes ### [Edge Runtime](#edge-runtime) In Next.js, the lightweight Edge Runtime is a subset of available Node.js APIs. The Edge Runtime is ideal if you need to deliver dynamic, personalized content at low latency with small, simple functions. The Edge Runtime's speed comes from its minimal use of resources, but that can be limiting in many scenarios. For example, code executed in the Edge Runtime [on Vercel cannot exceed between 1 MB and 4 MB](https://vercel.com/docs/concepts/limits/overview#edge-middleware-and-edge-functions-size), this limit includes imported packages, fonts and files, and will vary depending on your deployment infrastructure. In addition, the Edge Runtime does not support all Node.js APIs meaning some `npm` packages may not work. For example, "Module not found: Can't resolve 'fs'" or similar errors. We recommend using the Node.js runtime if you need to use these APIs or packages. ### [Node.js Runtime](#nodejs-runtime) Using the Node.js runtime gives you access to all Node.js APIs, and all npm packages that rely on them. However, it's not as fast to start up as routes using the Edge runtime. Deploying your Next.js application to a Node.js server will require managing, scaling, and configuring your infrastructure. Alternatively, you can consider deploying your Next.js application to a serverless platform like Vercel, which will handle this for you. ### [Serverless Node.js](#serverless-nodejs) Serverless is ideal if you need a scalable solution that can handle more complex computational loads than the Edge Runtime. With Serverless Functions on Vercel, for example, your overall code size is [50MB](https://vercel.com/docs/concepts/limits/overview#serverless-function-size) including imported packages, fonts, and files. The downside compared to routes using the [Edge](https://vercel.com/docs/concepts/functions/edge-functions) is that it can take hundreds of milliseconds for Serverless Functions to boot up before they begin processing requests. Depending on the amount of traffic your site receives, this could be a frequent occurrence as the functions are not frequently "warm". [Examples](#examples) --------------------- ### [Segment Runtime Option](#segment-runtime-option) You can specify a runtime for individual route segments in your Next.js application. To do so, [declare a variable called `runtime` and export it](/docs/app/api-reference/file-conventions/route-segment-config). The variable must be a string, and must have a value of either `'nodejs'` or `'edge'` runtime. The following example demonstrates a page route segment that exports a `runtime` with a value of `'edge'`: app/page.tsx TypeScript JavaScriptTypeScript export const runtime = 'edge' // 'nodejs' (default) | 'edge' You can also define `runtime` on a layout level, which will make all routes under the layout run on the edge runtime: app/layout.tsx TypeScript JavaScriptTypeScript export const runtime = 'edge' // 'nodejs' (default) | 'edge' If the segment runtime is _not_ set, the default `nodejs` runtime will be used. You do not need to use the `runtime` option if you do not plan to change from the Node.js runtime. > Please refer to the [Node.js Docs](https://nodejs.org/docs/latest/api/) and [Edge Docs](/docs/app/api-reference/edge) for the full list of available APIs. Both runtimes can also support [streaming](/docs/app/building-your-application/routing/loading-ui-and-streaming) depending on your deployment infrastructure. [Previous Composition Patterns ](/docs/app/building-your-application/rendering/composition-patterns) [Next Caching ](/docs/app/building-your-application/caching) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Top-level folders](#top-level-folders) * [Top-level files](#top-level-files) * [app Routing Conventions](#app-routing-conventions) * [Routing Files](#routing-files) * [Nested Routes](#nested-routes) * [Dynamic Routes](#dynamic-routes) * [Route Groups and Private Folders](#route-groups-and-private-folders) * [Parallel and Intercepted Routes](#parallel-and-intercepted-routes) * [Metadata File Conventions](#metadata-file-conventions) * [App Icons](#app-icons) * [Open Graph and Twitter Images](#open-graph-and-twitter-images) * [SEO](#seo) * [pages Routing Conventions](#pages-routing-conventions) * [Special Files](#special-files) * [Routes](#routes) * [Dynamic Routes](#dynamic-routes-1) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/01-getting-started/02-project-structure.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [Getting Started](/docs/getting-started)Project Structure Next.js Project Structure ========================= This page provides an overview of the project structure of a Next.js application. It covers top-level files and folders, configuration files, and routing conventions within the `app` and `pages` directories. Click the file and folder names to learn more about each convention. [Top-level folders](#top-level-folders) --------------------------------------- Top-level folders are used to organize your application's code and static assets.  [`app`](/docs/app/building-your-application/routing) App Router [`pages`](/docs/pages/building-your-application/routing) Pages Router [`public`](/docs/app/building-your-application/optimizing/static-assets) Static assets to be served [`src`](/docs/app/building-your-application/configuring/src-directory) Optional application source folder [Top-level files](#top-level-files) ----------------------------------- Top-level files are used to configure your application, manage dependencies, run middleware, integrate monitoring tools, and define environment variables. **Next.js** [`next.config.js`](/docs/app/api-reference/next-config-js) Configuration file for Next.js [`package.json`](/docs/getting-started/installation#manual-installation) Project dependencies and scripts [`instrumentation.ts`](/docs/app/building-your-application/optimizing/instrumentation) OpenTelemetry and Instrumentation file [`middleware.ts`](/docs/app/building-your-application/routing/middleware) Next.js request middleware [`.env`](/docs/app/building-your-application/configuring/environment-variables) Environment variables [`.env.local`](/docs/app/building-your-application/configuring/environment-variables) Local environment variables [`.env.production`](/docs/app/building-your-application/configuring/environment-variables) Production environment variables [`.env.development`](/docs/app/building-your-application/configuring/environment-variables) Development environment variables [`.eslintrc.json`](/docs/app/building-your-application/configuring/eslint) Configuration file for ESLint `.gitignore` Git files and folders to ignore `next-env.d.ts` TypeScript declaration file for Next.js `tsconfig.json` Configuration file for TypeScript `jsconfig.json` Configuration file for JavaScript [`app` Routing Conventions](#app-routing-conventions) ----------------------------------------------------- The following file conventions are used to define routes and handle metadata in the [`app` router](/docs/app). ### [Routing Files](#routing-files) [`layout`](/docs/app/api-reference/file-conventions/layout) `.js` `.jsx` `.tsx` Layout [`page`](/docs/app/api-reference/file-conventions/page) `.js` `.jsx` `.tsx` Page [`loading`](/docs/app/api-reference/file-conventions/loading) `.js` `.jsx` `.tsx` Loading UI [`not-found`](/docs/app/api-reference/file-conventions/not-found) `.js` `.jsx` `.tsx` Not found UI [`error`](/docs/app/api-reference/file-conventions/error) `.js` `.jsx` `.tsx` Error UI [`global-error`](/docs/app/api-reference/file-conventions/error#global-errorjs) `.js` `.jsx` `.tsx` Global error UI [`route`](/docs/app/api-reference/file-conventions/route) `.js` `.ts` API endpoint [`template`](/docs/app/api-reference/file-conventions/template) `.js` `.jsx` `.tsx` Re-rendered layout [`default`](/docs/app/api-reference/file-conventions/default) `.js` `.jsx` `.tsx` Parallel route fallback page ### [Nested Routes](#nested-routes) [`folder`](/docs/app/building-your-application/routing#route-segments) Route segment [`folder/folder`](/docs/app/building-your-application/routing#nested-routes) Nested route segment ### [Dynamic Routes](#dynamic-routes) [`[folder]`](/docs/app/building-your-application/routing/dynamic-routes#convention) Dynamic route segment [`[...folder]`](/docs/app/building-your-application/routing/dynamic-routes#catch-all-segments) Catch-all route segment [`[[...folder]]`](/docs/app/building-your-application/routing/dynamic-routes#optional-catch-all-segments) Optional catch-all route segment ### [Route Groups and Private Folders](#route-groups-and-private-folders) [`(folder)`](/docs/app/building-your-application/routing/route-groups#convention) Group routes without affecting routing [`_folder`](/docs/app/building-your-application/routing/colocation#private-folders) Opt folder and all child segments out of routing ### [Parallel and Intercepted Routes](#parallel-and-intercepted-routes) [`@folder`](/docs/app/building-your-application/routing/parallel-routes#slots) Named slot [`(.)folder`](/docs/app/building-your-application/routing/intercepting-routes#convention) Intercept same level [`(..)folder`](/docs/app/building-your-application/routing/intercepting-routes#convention) Intercept one level above [`(..)(..)folder`](/docs/app/building-your-application/routing/intercepting-routes#convention) Intercept two levels above [`(...)folder`](/docs/app/building-your-application/routing/intercepting-routes#convention) Intercept from root ### [Metadata File Conventions](#metadata-file-conventions) #### [App Icons](#app-icons) [`favicon`](/docs/app/api-reference/file-conventions/metadata/app-icons#favicon) `.ico` Favicon file [`icon`](/docs/app/api-reference/file-conventions/metadata/app-icons#icon) `.ico` `.jpg` `.jpeg` `.png` `.svg` App Icon file [`icon`](/docs/app/api-reference/file-conventions/metadata/app-icons#generate-icons-using-code-js-ts-tsx) `.js` `.ts` `.tsx` Generated App Icon [`apple-icon`](/docs/app/api-reference/file-conventions/metadata/app-icons#apple-icon) `.jpg` `.jpeg`, `.png` Apple App Icon file [`apple-icon`](/docs/app/api-reference/file-conventions/metadata/app-icons#generate-icons-using-code-js-ts-tsx) `.js` `.ts` `.tsx` Generated Apple App Icon #### [Open Graph and Twitter Images](#open-graph-and-twitter-images) [`opengraph-image`](/docs/app/api-reference/file-conventions/metadata/opengraph-image#opengraph-image) `.jpg` `.jpeg` `.png` `.gif` Open Graph image file [`opengraph-image`](/docs/app/api-reference/file-conventions/metadata/opengraph-image#generate-images-using-code-js-ts-tsx) `.js` `.ts` `.tsx` Generated Open Graph image [`twitter-image`](/docs/app/api-reference/file-conventions/metadata/opengraph-image#twitter-image) `.jpg` `.jpeg` `.png` `.gif` Twitter image file [`twitter-image`](/docs/app/api-reference/file-conventions/metadata/opengraph-image#generate-images-using-code-js-ts-tsx) `.js` `.ts` `.tsx` Generated Twitter image #### [SEO](#seo) [`sitemap`](/docs/app/api-reference/file-conventions/metadata/sitemap#sitemap-files-xml) `.xml` Sitemap file [`sitemap`](/docs/app/api-reference/file-conventions/metadata/sitemap#generating-a-sitemap-using-code-js-ts) `.js` `.ts` Generated Sitemap [`robots`](/docs/app/api-reference/file-conventions/metadata/robots#static-robotstxt) `.txt` Robots file [`robots`](/docs/app/api-reference/file-conventions/metadata/robots#generate-a-robots-file) `.js` `.ts` Generated Robots file [`pages` Routing Conventions](#pages-routing-conventions) --------------------------------------------------------- The following file conventions are used to define routes in the [`pages` router](/docs/pages). ### [Special Files](#special-files) [`_app`](/docs/pages/building-your-application/routing/custom-app) `.js` `.jsx` `.tsx` Custom App [`_document`](/docs/pages/building-your-application/routing/custom-document) `.js` `.jsx` `.tsx` Custom Document [`_error`](/docs/pages/building-your-application/routing/custom-error#more-advanced-error-page-customizing) `.js` `.jsx` `.tsx` Custom Error Page [`404`](/docs/pages/building-your-application/routing/custom-error#404-page) `.js` `.jsx` `.tsx` 404 Error Page [`500`](/docs/pages/building-your-application/routing/custom-error#500-page) `.js` `.jsx` `.tsx` 500 Error Page ### [Routes](#routes) **Folder convention** [`index`](/docs/pages/building-your-application/routing/pages-and-layouts#index-routes) `.js` `.jsx` `.tsx` Home page [`folder/index`](/docs/pages/building-your-application/routing/pages-and-layouts#index-routes) `.js` `.jsx` `.tsx` Nested page **File convention** [`index`](/docs/pages/building-your-application/routing/pages-and-layouts#index-routes) `.js` `.jsx` `.tsx` Home page [`file`](/docs/pages/building-your-application/routing/pages-and-layouts) `.js` `.jsx` `.tsx` Nested page ### [Dynamic Routes](#dynamic-routes-1) **Folder convention** [`[folder]/index`](/docs/pages/building-your-application/routing/dynamic-routes) `.js` `.jsx` `.tsx` Dynamic route segment [`[...folder]/index`](/docs/pages/building-your-application/routing/dynamic-routes#catch-all-segments) `.js` `.jsx` `.tsx` Catch-all route segment [`[[...folder]]/index`](/docs/pages/building-your-application/routing/dynamic-routes#optional-catch-all-segments) `.js` `.jsx` `.tsx` Optional catch-all route segment **File convention** [`[file]`](/docs/pages/building-your-application/routing/dynamic-routes) `.js` `.jsx` `.tsx` Dynamic route segment [`[...file]`](/docs/pages/building-your-application/routing/dynamic-routes#catch-all-segments) `.js` `.jsx` `.tsx` Catch-all route segment [`[[...file]]`](/docs/pages/building-your-application/routing/dynamic-routes#optional-catch-all-segments) `.js` `.jsx` `.tsx` Optional catch-all route segment [Previous Installation ](/docs/getting-started/installation) [Next App Router ](/docs/app) Was this helpful? supported. 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[turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering (CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [When to use Server and Client Components?](#when-to-use-server-and-client-components) * [Server Component Patterns](#server-component-patterns) * [Sharing data between components](#sharing-data-between-components) * [Keeping Server-only Code out of the Client Environment](#keeping-server-only-code-out-of-the-client-environment) * [Using Third-party Packages and Providers](#using-third-party-packages-and-providers) * [Using Context Providers](#using-context-providers) * [Advice for Library Authors](#advice-for-library-authors) * [Client Components](#client-components) * [Moving Client Components Down the Tree](#moving-client-components-down-the-tree) * [Passing props from Server to Client Components (Serialization)](#passing-props-from-server-to-client-components-serialization) * [Interleaving Server and Client Components](#interleaving-server-and-client-components) * [Unsupported Pattern: Importing Server Components into Client Components](#unsupported-pattern-importing-server-components-into-client-components) * [Supported Pattern: Passing Server Components to Client Components as Props](#supported-pattern-passing-server-components-to-client-components-as-props) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/03-rendering/03-composition-patterns.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Rendering](/docs/app/building-your-application/rendering)Composition Patterns Server and Client Composition Patterns ====================================== When building React applications, you will need to consider what parts of your application should be rendered on the server or the client. This page covers some recommended composition patterns when using Server and Client Components. [When to use Server and Client Components?](#when-to-use-server-and-client-components) -------------------------------------------------------------------------------------- Here's a quick summary of the different use cases for Server and Client Components: What do you need to do? Server Component Client Component Fetch data Access backend resources (directly) Keep sensitive information on the server (access tokens, API keys, etc) Keep large dependencies on the server / Reduce client-side JavaScript Add interactivity and event listeners (`onClick()`, `onChange()`, etc) Use State and Lifecycle Effects (`useState()`, `useReducer()`, `useEffect()`, etc) Use browser-only APIs Use custom hooks that depend on state, effects, or browser-only APIs Use [React Class components](https://react.dev/reference/react/Component) [Server Component Patterns](#server-component-patterns) ------------------------------------------------------- Before opting into client-side rendering, you may wish to do some work on the server like fetching data, or accessing your database or backend services. Here are some common patterns when working with Server Components: ### [Sharing data between components](#sharing-data-between-components) When fetching data on the server, there may be cases where you need to share data across different components. For example, you may have a layout and a page that depend on the same data. Instead of using [React Context](https://react.dev/learn/passing-data-deeply-with-context) (which is not available on the server) or passing data as props, you can use [`fetch`](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#fetching-data-on-the-server-with-fetch) or React's `cache` function to fetch the same data in the components that need it, without worrying about making duplicate requests for the same data. This is because React extends `fetch` to automatically memoize data requests, and the `cache` function can be used when `fetch` is not available. Learn more about [memoization](/docs/app/building-your-application/caching#request-memoization) in React. ### [Keeping Server-only Code out of the Client Environment](#keeping-server-only-code-out-of-the-client-environment) Since JavaScript modules can be shared between both Server and Client Components modules, it's possible for code that was only ever intended to be run on the server to sneak its way into the client. For example, take the following data-fetching function: lib/data.ts TypeScript JavaScriptTypeScript export async function getData() { const res = await fetch('https://external-service.com/data', { headers: { authorization: process.env.API_KEY, }, }) return res.json() } At first glance, it appears that `getData` works on both the server and the client. However, this function contains an `API_KEY`, written with the intention that it would only ever be executed on the server. Since the environment variable `API_KEY` is not prefixed with `NEXT_PUBLIC`, it's a private variable that can only be accessed on the server. To prevent your environment variables from being leaked to the client, Next.js replaces private environment variables with an empty string. As a result, even though `getData()` can be imported and executed on the client, it won't work as expected. And while making the variable public would make the function work on the client, you may not want to expose sensitive information to the client. To prevent this sort of unintended client usage of server code, we can use the `server-only` package to give other developers a build-time error if they ever accidentally import one of these modules into a Client Component. To use `server-only`, first install the package: Terminal npm install server-only Then import the package into any module that contains server-only code: lib/data.js import 'server-only' export async function getData() { const res = await fetch('https://external-service.com/data', { headers: { authorization: process.env.API_KEY, }, }) return res.json() } Now, any Client Component that imports `getData()` will receive a build-time error explaining that this module can only be used on the server. The corresponding package `client-only` can be used to mark modules that contain client-only code – for example, code that accesses the `window` object. ### [Using Third-party Packages and Providers](#using-third-party-packages-and-providers) Since Server Components are a new React feature, third-party packages and providers in the ecosystem are just beginning to add the `"use client"` directive to components that use client-only features like `useState`, `useEffect`, and `createContext`. Today, many components from `npm` packages that use client-only features do not yet have the directive. These third-party components will work as expected within Client Components since they have the `"use client"` directive, but they won't work within Server Components. For example, let's say you've installed the hypothetical `acme-carousel` package which has a `<Carousel />` component. This component uses `useState`, but it doesn't yet have the `"use client"` directive. If you use `<Carousel />` within a Client Component, it will work as expected: app/gallery.tsx TypeScript JavaScriptTypeScript 'use client' import { useState } from 'react' import { Carousel } from 'acme-carousel' export default function Gallery() { let [isOpen, setIsOpen] = useState(false) return ( <div> <button onClick={() => setIsOpen(true)}>View pictures</button> {/* Works, since Carousel is used within a Client Component */} {isOpen && <Carousel />} </div> ) } However, if you try to use it directly within a Server Component, you'll see an error: app/page.tsx TypeScript JavaScriptTypeScript import { Carousel } from 'acme-carousel' export default function Page() { return ( <div> <p>View pictures</p> {/* Error: `useState` can not be used within Server Components */} <Carousel /> </div> ) } This is because Next.js doesn't know `<Carousel />` is using client-only features. To fix this, you can wrap third-party components that rely on client-only features in your own Client Components: app/carousel.tsx TypeScript JavaScriptTypeScript 'use client' import { Carousel } from 'acme-carousel' export default Carousel Now, you can use `<Carousel />` directly within a Server Component: app/page.tsx TypeScript JavaScriptTypeScript import Carousel from './carousel' export default function Page() { return ( <div> <p>View pictures</p> {/* Works, since Carousel is a Client Component */} <Carousel /> </div> ) } We don't expect you to need to wrap most third-party components since it's likely you'll be using them within Client Components. However, one exception is providers, since they rely on React state and context, and are typically needed at the root of an application. [Learn more about third-party context providers below](#using-context-providers). #### [Using Context Providers](#using-context-providers) Context providers are typically rendered near the root of an application to share global concerns, like the current theme. Since [React context](https://react.dev/learn/passing-data-deeply-with-context) is not supported in Server Components, trying to create a context at the root of your application will cause an error: app/layout.tsx TypeScript JavaScriptTypeScript import { createContext } from 'react' // createContext is not supported in Server Components export const ThemeContext = createContext({}) export default function RootLayout({ children }) { return ( <html> <body> <ThemeContext.Provider value="dark">{children}</ThemeContext.Provider> </body> </html> ) } To fix this, create your context and render its provider inside of a Client Component: app/theme-provider.tsx TypeScript JavaScriptTypeScript 'use client' import { createContext } from 'react' export const ThemeContext = createContext({}) export default function ThemeProvider({ children, }: { children: React.ReactNode }) { return <ThemeContext.Provider value="dark">{children}</ThemeContext.Provider> } Your Server Component will now be able to directly render your provider since it's been marked as a Client Component: app/layout.tsx TypeScript JavaScriptTypeScript import ThemeProvider from './theme-provider' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html> <body> <ThemeProvider>{children}</ThemeProvider> </body> </html> ) } With the provider rendered at the root, all other Client Components throughout your app will be able to consume this context. > **Good to know**: You should render providers as deep as possible in the tree – notice how `ThemeProvider` only wraps `{children}` instead of the entire `<html>` document. This makes it easier for Next.js to optimize the static parts of your Server Components. #### [Advice for Library Authors](#advice-for-library-authors) In a similar fashion, library authors creating packages to be consumed by other developers can use the `"use client"` directive to mark client entry points of their package. This allows users of the package to import package components directly into their Server Components without having to create a wrapping boundary. You can optimize your package by using ['use client' deeper in the tree](#moving-client-components-down-the-tree), allowing the imported modules to be part of the Server Component module graph. It's worth noting some bundlers might strip out `"use client"` directives. You can find an example of how to configure esbuild to include the `"use client"` directive in the [React Wrap Balancer](https://github.com/shuding/react-wrap-balancer/blob/main/tsup.config.ts#L10-L13) and [Vercel Analytics](https://github.com/vercel/analytics/blob/main/packages/web/tsup.config.js#L26-L30) repositories. [Client Components](#client-components) --------------------------------------- ### [Moving Client Components Down the Tree](#moving-client-components-down-the-tree) To reduce the Client JavaScript bundle size, we recommend moving Client Components down your component tree. For example, you may have a Layout that has static elements (e.g. logo, links, etc) and an interactive search bar that uses state. Instead of making the whole layout a Client Component, move the interactive logic to a Client Component (e.g. `<SearchBar />`) and keep your layout as a Server Component. This means you don't have to send all the component Javascript of the layout to the client. app/layout.tsx TypeScript JavaScriptTypeScript // SearchBar is a Client Component import SearchBar from './searchbar' // Logo is a Server Component import Logo from './logo' // Layout is a Server Component by default export default function Layout({ children }: { children: React.ReactNode }) { return ( <> <nav> <Logo /> <SearchBar /> </nav> <main>{children}</main> </> ) } ### [Passing props from Server to Client Components (Serialization)](#passing-props-from-server-to-client-components-serialization) If you fetch data in a Server Component, you may want to pass data down as props to Client Components. Props passed from the Server to Client Components need to be [serializable](https://react.dev/reference/react/use-server#serializable-parameters-and-return-values) by React. If your Client Components depend on data that is not serializable, you can [fetch data on the client with a third party library](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#fetching-data-on-the-client-with-third-party-libraries) or on the server via a [Route Handler](/docs/app/building-your-application/routing/route-handlers). [Interleaving Server and Client Components](#interleaving-server-and-client-components) --------------------------------------------------------------------------------------- When interleaving Client and Server Components, it may be helpful to visualize your UI as a tree of components. Starting with the [root layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required), which is a Server Component, you can then render certain subtrees of components on the client by adding the `"use client"` directive. Within those client subtrees, you can still nest Server Components or call Server Actions, however there are some things to keep in mind: * During a request-response lifecycle, your code moves from the server to the client. If you need to access data or resources on the server while on the client, you'll be making a **new** request to the server - not switching back and forth. * When a new request is made to the server, all Server Components are rendered first, including those nested inside Client Components. The rendered result (RSC Payload) will contain references to the locations of Client Components. Then, on the client, React uses the RSC Payload to reconcile Server and Client Components into a single tree. * Since Client Components are rendered after Server Components, you cannot import a Server Component into a Client Component module (since it would require a new request back to the server). Instead, you can pass a Server Component as `props` to a Client Component. See the [unsupported pattern](#unsupported-pattern-importing-server-components-into-client-components) and [supported pattern](#supported-pattern-passing-server-components-to-client-components-as-props) sections below. ### [Unsupported Pattern: Importing Server Components into Client Components](#unsupported-pattern-importing-server-components-into-client-components) The following pattern is not supported. You cannot import a Server Component into a Client Component: app/client-component.tsx TypeScript JavaScriptTypeScript 'use client' // You cannot import a Server Component into a Client Component. import ServerComponent from './Server-Component' export default function ClientComponent({ children, }: { children: React.ReactNode }) { const [count, setCount] = useState(0) return ( <> <button onClick={() => setCount(count + 1)}>{count}</button> <ServerComponent /> </> ) } ### [Supported Pattern: Passing Server Components to Client Components as Props](#supported-pattern-passing-server-components-to-client-components-as-props) The following pattern is supported. You can pass Server Components as a prop to a Client Component. A common pattern is to use the React `children` prop to create a _"slot"_ in your Client Component. In the example below, `<ClientComponent>` accepts a `children` prop: app/client-component.tsx TypeScript JavaScriptTypeScript 'use client' import { useState } from 'react' export default function ClientComponent({ children, }: { children: React.ReactNode }) { const [count, setCount] = useState(0) return ( <> <button onClick={() => setCount(count + 1)}>{count}</button> {children} </> ) } `<ClientComponent>` doesn't know that `children` will eventually be filled in by the result of a Server Component. The only responsibility `<ClientComponent>` has is to decide **where** `children` will eventually be placed. In a parent Server Component, you can import both the `<ClientComponent>` and `<ServerComponent>` and pass `<ServerComponent>` as a child of `<ClientComponent>`: app/page.tsx TypeScript JavaScriptTypeScript // This pattern works: // You can pass a Server Component as a child or prop of a // Client Component. import ClientComponent from './client-component' import ServerComponent from './server-component' // Pages in Next.js are Server Components by default export default function Page() { return ( <ClientComponent> <ServerComponent /> </ClientComponent> ) } With this approach, `<ClientComponent>` and `<ServerComponent>` are decoupled and can be rendered independently. In this case, the child `<ServerComponent>` can be rendered on the server, well before `<ClientComponent>` is rendered on the client. > **Good to know:** > > * The pattern of "lifting content up" has been used to avoid re-rendering a nested child component when a parent component re-renders. > * You're not limited to the `children` prop. You can use any prop to pass JSX. [Previous Client Components ](/docs/app/building-your-application/rendering/client-components) [Next Edge and Node.js Runtimes ](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes) Was this helpful? supported. Send

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10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Why Switch?](#why-switch) * [Slow initial page loading time](#slow-initial-page-loading-time) * [No automatic code splitting](#no-automatic-code-splitting) * [Network waterfalls](#network-waterfalls) * [Fast and intentional loading states](#fast-and-intentional-loading-states) * [Choose the data fetching strategy](#choose-the-data-fetching-strategy) * [Middleware](#middleware) * [Built-in Optimizations](#built-in-optimizations) * [Migration Steps](#migration-steps) * [Step 1: Install the Next.js Dependency](#step-1-install-the-nextjs-dependency) * [Step 2: Create the Next.js Configuration File](#step-2-create-the-nextjs-configuration-file) * [Step 3: Update TypeScript Configuration](#step-3-update-typescript-configuration) * [Step 4: Create the Root Layout](#step-4-create-the-root-layout) * [Step 5: Create the Entrypoint Page](#step-5-create-the-entrypoint-page) * [Step 6: Update Static Image Imports](#step-6-update-static-image-imports) * [Step 7: Migrate the Environment Variables](#step-7-migrate-the-environment-variables) * [Step 8: Update Scripts in package.json](#step-8-update-scripts-in-packagejson) * [Step 9: Clean Up](#step-9-clean-up) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/11-upgrading/04-from-vite.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Upgrading](/docs/app/building-your-application/upgrading)Migrating from Vite Migrating from Vite =================== This guide will help you migrate an existing Vite application to Next.js. [Why Switch?](#why-switch) -------------------------- There are several reasons why you might want to switch from Vite to Next.js: ### [Slow initial page loading time](#slow-initial-page-loading-time) If you have built your application with the [default Vite plugin for React](https://github.com/vitejs/vite-plugin-react/tree/main/packages/plugin-react), your application is a purely client-side application. Client-side only applications, also known as single-page applications (SPAs), often experience slow initial page loading time. This happens due to a couple of reasons: 1. The browser needs to wait for the React code and your entire application bundle to download and run before your code is able to send requests to load some data. 2. Your application code grows with every new feature and extra dependency you add. ### [No automatic code splitting](#no-automatic-code-splitting) The previous issue of slow loading times can be somewhat managed with code splitting. However, if you try to do code splitting manually, you'll often make performance worse. It's easy to inadvertently introduce network waterfalls when code-splitting manually. Next.js provides automatic code splitting built into its router. ### [Network waterfalls](#network-waterfalls) A common cause of poor performance occurs when applications make sequential client-server requests to fetch data. One common pattern for data fetching in an SPA is to initially render a placeholder, and then fetch data after the component has mounted. Unfortunately, this means that a child component that fetches data can't start fetching until the parent component has finished loading its own data. While fetching data on the client is supported with Next.js, it also gives you the option to shift data fetching to the server, which can eliminate client-server waterfalls. ### [Fast and intentional loading states](#fast-and-intentional-loading-states) With built-in support for [streaming through React Suspense](/docs/app/building-your-application/routing/loading-ui-and-streaming#streaming-with-suspense), you can be more intentional about which parts of your UI you want to load first and in what order without introducing network waterfalls. This enables you to build pages that are faster to load and eliminate [layout shifts](https://vercel.com/blog/how-core-web-vitals-affect-seo). ### [Choose the data fetching strategy](#choose-the-data-fetching-strategy) Depending on your needs, Next.js allows you to choose your data fetching strategy on a page and component basis. You can decide to fetch at build time, at request time on the server, or on the client. For example, you can fetch data from your CMS and render your blog posts at build time, which can then be efficiently cached on a CDN. ### [Middleware](#middleware) [Next.js Middleware](/docs/app/building-your-application/routing/middleware) allows you to run code on the server before a request is completed. This is especially useful to avoid having a flash of unauthenticated content when the user visits an authenticated-only page by redirecting the user to a login page. The middleware is also useful for experimentation and [internationalization](/docs/app/building-your-application/routing/internationalization). ### [Built-in Optimizations](#built-in-optimizations) [Images](/docs/app/building-your-application/optimizing/images), [fonts](/docs/app/building-your-application/optimizing/fonts), and [third-party scripts](/docs/app/building-your-application/optimizing/scripts) often have significant impact on an application's performance. Next.js comes with built-in components that automatically optimize those for you. [Migration Steps](#migration-steps) ----------------------------------- Our goal with this migration is to get a working Next.js application as quickly as possible, so that you can then adopt Next.js features incrementally. To begin with, we'll keep it as a purely client-side application (SPA) without migrating your existing router. This helps minimize the chances of encountering issues during the migration process and reduces merge conflicts. ### [Step 1: Install the Next.js Dependency](#step-1-install-the-nextjs-dependency) The first thing you need to do is to install `next` as a dependency: Terminal npm install next@latest ### [Step 2: Create the Next.js Configuration File](#step-2-create-the-nextjs-configuration-file) Create a `next.config.mjs` at the root of your project. This file will hold your [Next.js configuration options](/docs/app/api-reference/next-config-js). next.config.mjs /** @type {import('next').NextConfig} */ const nextConfig = { output: 'export', // Outputs a Single-Page Application (SPA). distDir: './dist', // Changes the build output directory to `./dist/`. } export default nextConfig > **Good to know:** You can use either `.js` or `.mjs` for your Next.js configuration file. ### [Step 3: Update TypeScript Configuration](#step-3-update-typescript-configuration) If you're using TypeScript, you need to update your `tsconfig.json` file with the following changes to make it compatible with Next.js. If you're not using TypeScript, you can skip this step. 1. Remove the [project reference](https://www.typescriptlang.org/tsconfig#references) to `tsconfig.node.json` 2. Add `./dist/types/**/*.ts` and `./next-env.d.ts` to the [`include` array](https://www.typescriptlang.org/tsconfig#include) 3. Add `./node_modules` to the [`exclude` array](https://www.typescriptlang.org/tsconfig#exclude) 4. Add `{ "name": "next" }` to the [`plugins` array in `compilerOptions`](https://www.typescriptlang.org/tsconfig#plugins): `"plugins": [{ "name": "next" }]` 5. Set [`esModuleInterop`](https://www.typescriptlang.org/tsconfig#esModuleInterop) to `true`: `"esModuleInterop": true` 6. Set [`jsx`](https://www.typescriptlang.org/tsconfig#jsx) to `preserve`: `"jsx": "preserve"` 7. Set [`allowJs`](https://www.typescriptlang.org/tsconfig#allowJs) to `true`: `"allowJs": true` 8. Set [`forceConsistentCasingInFileNames`](https://www.typescriptlang.org/tsconfig#forceConsistentCasingInFileNames) to `true`: `"forceConsistentCasingInFileNames": true` 9. Set [`incremental`](https://www.typescriptlang.org/tsconfig#incremental) to `true`: `"incremental": true` Here's an example of a working `tsconfig.json` with those changes: tsconfig.json { "compilerOptions": { "target": "ES2020", "useDefineForClassFields": true, "lib": ["ES2020", "DOM", "DOM.Iterable"], "module": "ESNext", "esModuleInterop": true, "skipLibCheck": true, "moduleResolution": "bundler", "allowImportingTsExtensions": true, "resolveJsonModule": true, "isolatedModules": true, "noEmit": true, "jsx": "preserve", "strict": true, "noUnusedLocals": true, "noUnusedParameters": true, "noFallthroughCasesInSwitch": true, "allowJs": true, "forceConsistentCasingInFileNames": true, "incremental": true, "plugins": [{ "name": "next" }] }, "include": ["./src", "./dist/types/**/*.ts", "./next-env.d.ts"], "exclude": ["./node_modules"] } You can find more information about configuring TypeScript on the [Next.js docs](/docs/app/building-your-application/configuring/typescript#typescript-plugin). ### [Step 4: Create the Root Layout](#step-4-create-the-root-layout) A Next.js [App Router](/docs/app) application must include a [root layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required) file, which is a [React Server Component](/docs/app/building-your-application/rendering/server-components) that will wrap all pages in your application. This file is defined at the top level of the `app` directory. The closest equivalent to the root layout file in a Vite application is the [`index.html` file](https://vitejs.dev/guide/#index-html-and-project-root), which contains your `<html>`, `<head>`, and `<body>` tags. In this step, you'll convert your `index.html` file into a root layout file: 1. Create a new `app` directory in your `src` directory. 2. Create a new `layout.tsx` file inside that `app` directory: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return null } > **Good to know**: `.js`, `.jsx`, or `.tsx` extensions can be used for Layout files. 3. Copy the content of your `index.html` file into the previously created `<RootLayout>` component while replacing the `body.div#root` and `body.script` tags with `<div id="root">{children}</div>`: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <head> <meta charset="UTF-8" /> <link rel="icon" type="image/svg+xml" href="/icon.svg" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>My App</title> <meta name="description" content="My App is a..." /> </head> <body> <div id="root">{children}</div> </body> </html> ) } 4. Next.js already includes by default the [meta charset](https://developer.mozilla.org/docs/Web/HTML/Element/meta#charset) and [meta viewport](https://developer.mozilla.org/docs/Web/HTML/Viewport_meta_tag) tags, so you can safely remove those from your `<head>`: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <head> <link rel="icon" type="image/svg+xml" href="/icon.svg" /> <title>My App</title> <meta name="description" content="My App is a..." /> </head> <body> <div id="root">{children}</div> </body> </html> ) } 5. Any [metadata files](/docs/app/building-your-application/optimizing/metadata#file-based-metadata) such as `favicon.ico`, `icon.png`, `robots.txt` are automatically added to the application `<head>` tag as long as you have them placed into the top level of the `app` directory. After moving [all supported files](/docs/app/building-your-application/optimizing/metadata#file-based-metadata) into the `app` directory you can safely delete their `<link>` tags: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <head> <title>My App</title> <meta name="description" content="My App is a..." /> </head> <body> <div id="root">{children}</div> </body> </html> ) } 6. Finally, Next.js can manage your last `<head>` tags with the [Metadata API](/docs/app/building-your-application/optimizing/metadata). Move your final metadata info into an exported [`metadata` object](/docs/app/api-reference/functions/generate-metadata#metadata-object): app/layout.tsx TypeScript JavaScriptTypeScript import type { Metadata } from 'next' export const metadata: Metadata = { title: 'My App', description: 'My App is a...', } export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body> <div id="root">{children}</div> </body> </html> ) } With the above changes, you shifted from declaring everything in your `index.html` to using Next.js' convention-based approach built into the framework ([Metadata API](/docs/app/building-your-application/optimizing/metadata)). This approach enables you to more easily improve your SEO and web shareability of your pages. ### [Step 5: Create the Entrypoint Page](#step-5-create-the-entrypoint-page) On Next.js you declare an entrypoint for your application by creating a `page.tsx` file. The closest equivalent of this file on Vite is your `main.tsx` file. In this step, you’ll set up the entrypoint of your application. 1. **Create a `[[...slug]]` directory in your `app` directory.** Since in this guide we're aiming first to set up our Next.js as an SPA (Single Page Application), you need your page entrypoint to catch all possible routes of your application. For that, create a new `[[...slug]]` directory in your `app` directory. This directory is what is called an [optional catch-all route segment](/docs/app/building-your-application/routing/dynamic-routes#optional-catch-all-segments). Next.js uses a file-system based router where [directories are used to define routes](/docs/app/building-your-application/routing/defining-routes#creating-routes). This special directory will make sure that all routes of your application will be directed to its containing `page.tsx` file. 2. **Create a new `page.tsx` file inside the `app/[[...slug]]` directory with the following content:** app/\[\[...slug\]\]/page.tsx TypeScript JavaScriptTypeScript import '../../index.css' export function generateStaticParams() { return [{ slug: [''] }] } export default function Page() { return '...' // We'll update this } > **Good to know**: `.js`, `.jsx`, or `.tsx` extensions can be used for Page files. This file is a [Server Component](/docs/app/building-your-application/rendering/server-components). When you run `next build`, the file is prerendered into a static asset. It does _not_ require any dynamic code. This file imports our global CSS and tells [`generateStaticParams`](/docs/app/api-reference/functions/generate-static-params) we are only going to generate one route, the index route at `/`. Now, let's move the rest of our Vite application which will run client-only. app/\[\[...slug\]\]/client.tsx TypeScript JavaScriptTypeScript 'use client' import React from 'react' import dynamic from 'next/dynamic' const App = dynamic(() => import('../../App'), { ssr: false }) export function ClientOnly() { return <App /> } This file is a [Client Component](/docs/app/building-your-application/rendering/client-components), defined by the `'use client'` directive. Client Components are still [prerendered to HTML](/docs/app/building-your-application/rendering/client-components#how-are-client-components-rendered) on the server before being sent to the client. Since we want a client-only application to start, we can configure Next.js to disable prerendering from the `App` component down. const App = dynamic(() => import('../../App'), { ssr: false }) Now, update your entrypoint page to use the new component: app/\[\[...slug\]\]/page.tsx TypeScript JavaScriptTypeScript import '../../index.css' import { ClientOnly } from './client' export function generateStaticParams() { return [{ slug: [''] }] } export default function Page() { return <ClientOnly /> } ### [Step 6: Update Static Image Imports](#step-6-update-static-image-imports) Next.js handles static image imports slightly different from Vite. With Vite, importing an image file will return its public URL as a string: App.tsx import image from './img.png' // `image` will be '/assets/img.2d8efhg.png' in production export default function App() { return <img src={image} /> } With Next.js, static image imports return an object. The object can then be used directly with the Next.js [`<Image>` component](/docs/app/api-reference/components/image), or you can use the object's `src` property with your existing `<img>` tag. The `<Image>` component has the added benefits of [automatic image optimization](/docs/app/building-your-application/optimizing/images). The `<Image>` component automatically sets the `width` and `height` attributes of the resulting `<img>` based on the image's dimensions. This prevents layout shifts when the image loads. However, this can cause issues if your app contains images with only one of their dimensions being styled without the other styled to `auto`. When not styled to `auto`, the dimension will default to the `<img>` dimension attribute's value, which can cause the image to appear distorted. Keeping the `<img>` tag will reduce the amount of changes in your application and prevent the above issues. You can then optionally later migrate to the `<Image>` component to take advantage of optimizing images by [configuring a loader](/docs/app/building-your-application/optimizing/images#loaders), or moving to the default Next.js server which has automatic image optimization. 1. **Convert absolute import paths for images imported from `/public` into relative imports:** // Before import logo from '/logo.png' // After import logo from '../public/logo.png' 2. **Pass the image `src` property instead of the whole image object to your `<img>` tag:** // Before <img src={logo} /> // After <img src={logo.src} /> Alternatively, you can reference the public URL for the image asset based on the filename. For example, `public/logo.png` will serve the image at `/logo.png` for your application, which would be the `src` value. > **Warning:** If you're using TypeScript, you might encounter type errors when accessing the `src` property. You can safely ignore those for now. They will be fixed by the end of this guide. ### [Step 7: Migrate the Environment Variables](#step-7-migrate-the-environment-variables) Next.js has support for `.env` [environment variables](/docs/app/building-your-application/configuring/environment-variables) similar to Vite. The main difference is the prefix used to expose environment variables on the client-side. * Change all environment variables with the `VITE_` prefix to `NEXT_PUBLIC_`. Vite exposes a few built-in environment variables on the special `import.meta.env` object which aren’t supported by Next.js. You need to update their usage as follows: * `import.meta.env.MODE` ⇒ `process.env.NODE_ENV` * `import.meta.env.PROD` ⇒ `process.env.NODE_ENV === 'production'` * `import.meta.env.DEV` ⇒ `process.env.NODE_ENV !== 'production'` * `import.meta.env.SSR` ⇒ `typeof window !== 'undefined'` Next.js also doesn't provide a built-in `BASE_URL` environment variable. However, you can still configure one, if you need it: 1. **Add the following to your `.env` file:** .env # ... NEXT_PUBLIC_BASE_PATH="/some-base-path" 2. **Set [`basePath`](/docs/app/api-reference/next-config-js/basePath) to `process.env.NEXT_PUBLIC_BASE_PATH` in your `next.config.mjs` file:** next.config.mjs /** @type {import('next').NextConfig} */ const nextConfig = { output: 'export', // Outputs a Single-Page Application (SPA). distDir: './dist', // Changes the build output directory to `./dist/`. basePath: process.env.NEXT_PUBLIC_BASE_PATH, // Sets the base path to `/some-base-path`. } export default nextConfig 3. **Update `import.meta.env.BASE_URL` usages to `process.env.NEXT_PUBLIC_BASE_PATH`** ### [Step 8: Update Scripts in `package.json`](#step-8-update-scripts-in-packagejson) You should now be able to run your application to test if you successfully migrated to Next.js. But before that, you need to update your `scripts` in your `package.json` with Next.js related commands, and add `.next` and `next-env.d.ts` to your `.gitignore`: package.json { "scripts": { "dev": "next dev", "build": "next build", "start": "next start" } } .gitignore # ... .next next-env.d.ts dist Now run `npm run dev`, and open [`http://localhost:3000`](http://localhost:3000). You should see your application now running on Next.js. > **Example:** Check out [this pull request](https://github.com/inngest/vite-to-nextjs/pull/1) for a working example of a Vite application migrated to Next.js. ### [Step 9: Clean Up](#step-9-clean-up) You can now clean up your codebase from Vite related artifacts: * Delete `main.tsx` * Delete `index.html` * Delete `vite-env.d.ts` * Delete `tsconfig.node.json` * Delete `vite.config.ts` * Uninstall Vite dependencies [Next Steps](#next-steps) ------------------------- If everything went according to plan, you now have a functioning Next.js application running as a single-page application. However, you aren't yet taking advantage of most of Next.js' benefits, but you can now start making incremental changes to reap all the benefits. Here's what you might want to do next: * Migrate from React Router to the [Next.js App Router](/docs/app/building-your-application/routing) to get: * Automatic code splitting * [Streaming Server-Rendering](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [React Server Components](/docs/app/building-your-application/rendering/server-components) * [Optimize images with the `<Image>` component](/docs/app/building-your-application/optimizing/images) * [Optimize fonts with `next/font`](/docs/app/building-your-application/optimizing/fonts) * [Optimize third-party scripts with the `<Script>` component](/docs/app/building-your-application/optimizing/scripts) * [Update your ESLint configuration to support Next.js rules](/docs/app/building-your-application/configuring/eslint) [Previous Version 14 ](/docs/app/building-your-application/upgrading/version-14) [Next Migrating from Create React App ](/docs/app/building-your-application/upgrading/from-create-react-app) Was this helpful? supported. 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[Returns](#returns) ------------------- The `generateSitemaps` returns an array of objects with an `id` property. [URLs](#urls) ------------- In production, your generated sitemaps will be available at `/.../sitemap/[id].xml`. For example, `/product/sitemap/1.xml`. In development, you can view the generated sitemap on `/.../sitemap.xml/[id]`. For example, `/product/sitemap.xml/1`. This difference is temporary and will follow the production format. [Example](#example) ------------------- For example, to split a sitemap using `generateSitemaps`, return an array of objects with the sitemap `id`. Then, use the `id` to generate the unique sitemaps. app/product/sitemap.ts TypeScript JavaScriptTypeScript import { BASE_URL } from '@/app/lib/constants' export async function generateSitemaps() { // Fetch the total number of products and calculate the number of sitemaps needed return [{ id: 0 }, { id: 1 }, { id: 2 }, { id: 3 }] } export default async function sitemap({ id, }: { id: number }): Promise<MetadataRoute.Sitemap> { // Google's limit is 50,000 URLs per sitemap const start = id * 50000 const end = start + 50000 const products = await getProducts( `SELECT id, date FROM products WHERE id BETWEEN ${start} AND ${end}` ) return products.map((product) => ({ url: `${BASE_URL}/product/${product.id}`, lastModified: product.date, })) } Next Steps ---------- Learn how to create sitemaps for your Next.js application. [ App Router ... Metadata Files ### sitemap.xml API Reference for the sitemap.xml file. ](/docs/app/api-reference/file-conventions/metadata/sitemap) [Previous generateMetadata ](/docs/app/api-reference/functions/generate-metadata) [Next generateStaticParams ](/docs/app/api-reference/functions/generate-static-params) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [The metadata object](#the-metadata-object) * [generateMetadata function](#generatemetadata-function) * [Parameters](#parameters) * [Returns](#returns) * [Metadata Fields](#metadata-fields) * [title](#title) * [String](#string) * [Template object](#template-object) * [Default](#default) * [Template](#template) * [Absolute](#absolute) * [description](#description) * [Basic Fields](#basic-fields) * [metadataBase](#metadatabase) * [Default value](#default-value) * [URL Composition](#url-composition) * [openGraph](#opengraph) * [robots](#robots) * [icons](#icons) * [themeColor](#themecolor) * [manifest](#manifest) * [twitter](#twitter) * [viewport](#viewport) * [verification](#verification) * [appleWebApp](#applewebapp) * [alternates](#alternates) * [appLinks](#applinks) * [archives](#archives) * [assets](#assets) * [bookmarks](#bookmarks) * [category](#category) * [other](#other) * [Unsupported Metadata](#unsupported-metadata) * [Resource hints](#resource-hints) * [<link rel="preload">](#link-relpreload) * [<link rel="preconnect">](#link-relpreconnect) * [<link rel="dns-prefetch">](#link-reldns-prefetch) * [Types](#types) * [metadata object](#metadata-object) * [generateMetadata function](#generatemetadata-function-1) * [Regular function](#regular-function) * [Async function](#async-function) * [With segment props](#with-segment-props) * [With parent metadata](#with-parent-metadata) * [JavaScript Projects](#javascript-projects) * [Version History](#version-history) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/generate-metadata.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)generateMetadata Metadata Object and generateMetadata Options ============================================ This page covers all **Config-based Metadata** options with `generateMetadata` and the static metadata object. layout.tsx | page.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' // either Static metadata export const metadata: Metadata = { title: '...', } // or Dynamic metadata export async function generateMetadata({ params }) { return { title: '...', } } > **Good to know**: > > * The `metadata` object and `generateMetadata` function exports are **only supported in Server Components**. > * You cannot export both the `metadata` object and `generateMetadata` function from the same route segment. [The `metadata` object](#the-metadata-object) --------------------------------------------- To define static metadata, export a [`Metadata` object](#metadata-fields) from a `layout.js` or `page.js` file. layout.tsx | page.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: '...', description: '...', } export default function Page() {} See the [Metadata Fields](#metadata-fields) for a complete list of supported options. [`generateMetadata` function](#generatemetadata-function) --------------------------------------------------------- Dynamic metadata depends on **dynamic information**, such as the current route parameters, external data, or `metadata` in parent segments, can be set by exporting a `generateMetadata` function that returns a [`Metadata` object](#metadata-fields). app/products/\[id\]/page.tsx TypeScript JavaScriptTypeScript import { Metadata, ResolvingMetadata } from 'next' type Props = { params: { id: string } searchParams: { [key: string]: string | string[] | undefined } } export async function generateMetadata( { params, searchParams }: Props, parent: ResolvingMetadata ): Promise<Metadata> { // read route params const id = params.id // fetch data const product = await fetch(`https://.../${id}`).then((res) => res.json()) // optionally access and extend (rather than replace) parent metadata const previousImages = (await parent).openGraph?.images || [] return { title: product.title, openGraph: { images: ['/some-specific-page-image.jpg', ...previousImages], }, } } export default function Page({ params, searchParams }: Props) {} ### [Parameters](#parameters) `generateMetadata` function accepts the following parameters: * `props` - An object containing the parameters of the current route: * `params` - An object containing the [dynamic route parameters](/docs/app/building-your-application/routing/dynamic-routes) object from the root segment down to the segment `generateMetadata` is called from. Examples: Route URL `params` `app/shop/[slug]/page.js` `/shop/1` `{ slug: '1' }` `app/shop/[tag]/[item]/page.js` `/shop/1/2` `{ tag: '1', item: '2' }` `app/shop/[...slug]/page.js` `/shop/1/2` `{ slug: ['1', '2'] }` * `searchParams` - An object containing the current URL's [search params](https://developer.mozilla.org/docs/Learn/Common_questions/What_is_a_URL#parameters). Examples: URL `searchParams` `/shop?a=1` `{ a: '1' }` `/shop?a=1&b=2` `{ a: '1', b: '2' }` `/shop?a=1&a=2` `{ a: ['1', '2'] }` * `parent` - A promise of the resolved metadata from parent route segments. ### [Returns](#returns) `generateMetadata` should return a [`Metadata` object](#metadata-fields) containing one or more metadata fields. > **Good to know**: > > * If metadata doesn't depend on runtime information, it should be defined using the static [`metadata` object](#the-metadata-object) rather than `generateMetadata`. > * `fetch` requests are automatically [memoized](/docs/app/building-your-application/caching#request-memoization) for the same data across `generateMetadata`, `generateStaticParams`, Layouts, Pages, and Server Components. React [`cache` can be used](/docs/app/building-your-application/caching#request-memoization) if `fetch` is unavailable. > * `searchParams` are only available in `page.js` segments. > * The [`redirect()`](/docs/app/api-reference/functions/redirect) and [`notFound()`](/docs/app/api-reference/functions/not-found) Next.js methods can also be used inside `generateMetadata`. [Metadata Fields](#metadata-fields) ----------------------------------- ### [`title`](#title) The `title` attribute is used to set the title of the document. It can be defined as a simple [string](#string) or an optional [template object](#template-object). #### [String](#string) layout.js | page.js export const metadata = { title: 'Next.js', } <head> output <title>Next.js</title> #### [Template object](#template-object) app/layout.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: { template: '...', default: '...', absolute: '...', }, } ##### [Default](#default) `title.default` can be used to provide a **fallback title** to child route segments that don't define a `title`. app/layout.tsx import type { Metadata } from 'next' export const metadata: Metadata = { title: { default: 'Acme', }, } app/about/page.tsx import type { Metadata } from 'next' export const metadata: Metadata = {} // Output: <title>Acme</title> ##### [Template](#template) `title.template` can be used to add a prefix or a suffix to `titles` defined in **child** route segments. app/layout.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: { template: '%s | Acme', default: 'Acme', // a default is required when creating a template }, } app/about/page.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: 'About', } // Output: <title>About | Acme</title> > **Good to know**: > > * `title.template` applies to **child** route segments and **not** the segment it's defined in. This means: > > * `title.default` is **required** when you add a `title.template`. > * `title.template` defined in `layout.js` will not apply to a `title` defined in a `page.js` of the same route segment. > * `title.template` defined in `page.js` has no effect because a page is always the terminating segment (it doesn't have any children route segments). > * `title.template` has **no effect** if a route has not defined a `title` or `title.default`. > ##### [Absolute](#absolute) `title.absolute` can be used to provide a title that **ignores** `title.template` set in parent segments. app/layout.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: { template: '%s | Acme', }, } app/about/page.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: { absolute: 'About', }, } // Output: <title>About</title> > **Good to know**: > > * `layout.js` > > * `title` (string) and `title.default` define the default title for child segments (that do not define their own `title`). It will augment `title.template` from the closest parent segment if it exists. > * `title.absolute` defines the default title for child segments. It ignores `title.template` from parent segments. > * `title.template` defines a new title template for child segments. > * `page.js` > > * If a page does not define its own title the closest parents resolved title will be used. > * `title` (string) defines the routes title. It will augment `title.template` from the closest parent segment if it exists. > * `title.absolute` defines the route title. It ignores `title.template` from parent segments. > * `title.template` has no effect in `page.js` because a page is always the terminating segment of a route. ### [`description`](#description) layout.js | page.js export const metadata = { description: 'The React Framework for the Web', } <head> output <meta name="description" content="The React Framework for the Web" /> ### [Basic Fields](#basic-fields) layout.js | page.js export const metadata = { generator: 'Next.js', applicationName: 'Next.js', referrer: 'origin-when-cross-origin', keywords: ['Next.js', 'React', 'JavaScript'], authors: [{ name: 'Seb' }, { name: 'Josh', url: 'https://nextjs.org' }], creator: 'Jiachi Liu', publisher: 'Sebastian Markbåge', formatDetection: { email: false, address: false, telephone: false, }, } <head> output <meta name="application-name" content="Next.js" /> <meta name="author" content="Seb" /> <link rel="author" href="https://nextjs.org" /> <meta name="author" content="Josh" /> <meta name="generator" content="Next.js" /> <meta name="keywords" content="Next.js,React,JavaScript" /> <meta name="referrer" content="origin-when-cross-origin" /> <meta name="color-scheme" content="dark" /> <meta name="creator" content="Jiachi Liu" /> <meta name="publisher" content="Sebastian Markbåge" /> <meta name="format-detection" content="telephone=no, address=no, email=no" /> ### [`metadataBase`](#metadatabase) `metadataBase` is a convenience option to set a base URL prefix for `metadata` fields that require a fully qualified URL. * `metadataBase` allows URL-based `metadata` fields defined in the **current route segment and below** to use a **relative path** instead of an otherwise required absolute URL. * The field's relative path will be composed with `metadataBase` to form a fully qualified URL. * If not configured, `metadataBase` is **automatically populated** with a [default value](#default-value). layout.js | page.js export const metadata = { metadataBase: new URL('https://acme.com'), alternates: { canonical: '/', languages: { 'en-US': '/en-US', 'de-DE': '/de-DE', }, }, openGraph: { images: '/og-image.png', }, } <head> output <link rel="canonical" href="https://acme.com" /> <link rel="alternate" hreflang="en-US" href="https://acme.com/en-US" /> <link rel="alternate" hreflang="de-DE" href="https://acme.com/de-DE" /> <meta property="og:image" content="https://acme.com/og-image.png" /> > **Good to know**: > > * `metadataBase` is typically set in root `app/layout.js` to apply to URL-based `metadata` fields across all routes. > * All URL-based `metadata` fields that require absolute URLs can be configured with a `metadataBase` option. > * `metadataBase` can contain a subdomain e.g. `https://app.acme.com` or base path e.g. `https://acme.com/start/from/here` > * If a `metadata` field provides an absolute URL, `metadataBase` will be ignored. > * Using a relative path in a URL-based `metadata` field without configuring a `metadataBase` will cause a build error. > * Next.js will normalize duplicate slashes between `metadataBase` (e.g. `https://acme.com/`) and a relative field (e.g. `/path`) to a single slash (e.g. `https://acme.com/path`) #### [Default value](#default-value) If not configured, `metadataBase` has a **default value** * When [`VERCEL_URL`](https://vercel.com/docs/concepts/projects/environment-variables/system-environment-variables#:~:text=.-,VERCEL_URL,-The%20domain%20name) is detected: `https://${process.env.VERCEL_URL}` otherwise it falls back to `http://localhost:${process.env.PORT || 3000}`. * When overriding the default, we recommend using environment variables to compute the URL. This allows configuring a URL for local development, staging, and production environments. #### [URL Composition](#url-composition) URL composition favors developer intent over default directory traversal semantics. * Trailing slashes between `metadataBase` and `metadata` fields are normalized. * An "absolute" path in a `metadata` field (that typically would replace the whole URL path) is treated as a "relative" path (starting from the end of `metadataBase`). For example, given the following `metadataBase`: app/layout.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { metadataBase: new URL('https://acme.com'), } Any `metadata` fields that inherit the above `metadataBase` and set their own value will be resolved as follows: `metadata` field Resolved URL `/` `https://acme.com` `./` `https://acme.com` `payments` `https://acme.com/payments` `/payments` `https://acme.com/payments` `./payments` `https://acme.com/payments` `../payments` `https://acme.com/payments` `https://beta.acme.com/payments` `https://beta.acme.com/payments` ### [`openGraph`](#opengraph) layout.js | page.js export const metadata = { openGraph: { title: 'Next.js', description: 'The React Framework for the Web', url: 'https://nextjs.org', siteName: 'Next.js', images: [ { url: 'https://nextjs.org/og.png', // Must be an absolute URL width: 800, height: 600, }, { url: 'https://nextjs.org/og-alt.png', // Must be an absolute URL width: 1800, height: 1600, alt: 'My custom alt', }, ], locale: 'en_US', type: 'website', }, } <head> output <meta property="og:title" content="Next.js" /> <meta property="og:description" content="The React Framework for the Web" /> <meta property="og:url" content="https://nextjs.org/" /> <meta property="og:site_name" content="Next.js" /> <meta property="og:locale" content="en_US" /> <meta property="og:image:url" content="https://nextjs.org/og.png" /> <meta property="og:image:width" content="800" /> <meta property="og:image:height" content="600" /> <meta property="og:image:url" content="https://nextjs.org/og-alt.png" /> <meta property="og:image:width" content="1800" /> <meta property="og:image:height" content="1600" /> <meta property="og:image:alt" content="My custom alt" /> <meta property="og:type" content="website" /> layout.js | page.js export const metadata = { openGraph: { title: 'Next.js', description: 'The React Framework for the Web', type: 'article', publishedTime: '2023-01-01T00:00:00.000Z', authors: ['Seb', 'Josh'], }, } <head> output <meta property="og:title" content="Next.js" /> <meta property="og:description" content="The React Framework for the Web" /> <meta property="og:type" content="article" /> <meta property="article:published_time" content="2023-01-01T00:00:00.000Z" /> <meta property="article:author" content="Seb" /> <meta property="article:author" content="Josh" /> > **Good to know**: > > * It may be more convenient to use the [file-based Metadata API](/docs/app/api-reference/file-conventions/metadata/opengraph-image#image-files-jpg-png-gif) for Open Graph images. Rather than having to sync the config export with actual files, the file-based API will automatically generate the correct metadata for you. ### [`robots`](#robots) import type { Metadata } from 'next' export const metadata: Metadata = { robots: { index: false, follow: true, nocache: true, googleBot: { index: true, follow: false, noimageindex: true, 'max-video-preview': -1, 'max-image-preview': 'large', 'max-snippet': -1, }, }, } <head> output <meta name="robots" content="noindex, follow, nocache" /> <meta name="googlebot" content="index, nofollow, noimageindex, max-video-preview:-1, max-image-preview:large, max-snippet:-1" /> ### [`icons`](#icons) > **Good to know**: We recommend using the [file-based Metadata API](/docs/app/api-reference/file-conventions/metadata/app-icons#image-files-ico-jpg-png) for icons where possible. Rather than having to sync the config export with actual files, the file-based API will automatically generate the correct metadata for you. layout.js | page.js export const metadata = { icons: { icon: '/icon.png', shortcut: '/shortcut-icon.png', apple: '/apple-icon.png', other: { rel: 'apple-touch-icon-precomposed', url: '/apple-touch-icon-precomposed.png', }, }, } <head> output <link rel="shortcut icon" href="/shortcut-icon.png" /> <link rel="icon" href="/icon.png" /> <link rel="apple-touch-icon" href="/apple-icon.png" /> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png" /> layout.js | page.js export const metadata = { icons: { icon: [ { url: '/icon.png' }, new URL('/icon.png', 'https://example.com'), { url: '/icon-dark.png', media: '(prefers-color-scheme: dark)' }, ], shortcut: ['/shortcut-icon.png'], apple: [ { url: '/apple-icon.png' }, { url: '/apple-icon-x3.png', sizes: '180x180', type: 'image/png' }, ], other: [ { rel: 'apple-touch-icon-precomposed', url: '/apple-touch-icon-precomposed.png', }, ], }, } <head> output <link rel="shortcut icon" href="/shortcut-icon.png" /> <link rel="icon" href="/icon.png" /> <link rel="icon" href="https://example.com/icon.png" /> <link rel="icon" href="/icon-dark.png" media="(prefers-color-scheme: dark)" /> <link rel="apple-touch-icon" href="/apple-icon.png" /> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png" /> <link rel="apple-touch-icon" href="/apple-icon-x3.png" sizes="180x180" type="image/png" /> > **Good to know**: The `msapplication-*` meta tags are no longer supported in Chromium builds of Microsoft Edge, and thus no longer needed. ### [`themeColor`](#themecolor) > **Deprecated**: The `themeColor` option in `metadata` is deprecated as of Next.js 14. Please use the [`viewport` configuration](/docs/app/api-reference/functions/generate-viewport) instead. ### [`manifest`](#manifest) A web application manifest, as defined in the [Web Application Manifest specification](https://developer.mozilla.org/docs/Web/Manifest). layout.js | page.js export const metadata = { manifest: 'https://nextjs.org/manifest.json', } <head> output <link rel="manifest" href="https://nextjs.org/manifest.json" /> ### [`twitter`](#twitter) The Twitter specification is (surprisingly) used for more than just X (formerly known as Twitter). Learn more about the [Twitter Card markup reference](https://developer.twitter.com/en/docs/twitter-for-websites/cards/overview/markup). layout.js | page.js export const metadata = { twitter: { card: 'summary_large_image', title: 'Next.js', description: 'The React Framework for the Web', siteId: '1467726470533754880', creator: '@nextjs', creatorId: '1467726470533754880', images: ['https://nextjs.org/og.png'], // Must be an absolute URL }, } <head> output <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:site:id" content="1467726470533754880" /> <meta name="twitter:creator" content="@nextjs" /> <meta name="twitter:creator:id" content="1467726470533754880" /> <meta name="twitter:title" content="Next.js" /> <meta name="twitter:description" content="The React Framework for the Web" /> <meta name="twitter:image" content="https://nextjs.org/og.png" /> layout.js | page.js export const metadata = { twitter: { card: 'app', title: 'Next.js', description: 'The React Framework for the Web', siteId: '1467726470533754880', creator: '@nextjs', creatorId: '1467726470533754880', images: { url: 'https://nextjs.org/og.png', alt: 'Next.js Logo', }, app: { name: 'twitter_app', id: { iphone: 'twitter_app://iphone', ipad: 'twitter_app://ipad', googleplay: 'twitter_app://googleplay', }, url: { iphone: 'https://iphone_url', ipad: 'https://ipad_url', }, }, }, } <head> output <meta name="twitter:site:id" content="1467726470533754880" /> <meta name="twitter:creator" content="@nextjs" /> <meta name="twitter:creator:id" content="1467726470533754880" /> <meta name="twitter:title" content="Next.js" /> <meta name="twitter:description" content="The React Framework for the Web" /> <meta name="twitter:card" content="app" /> <meta name="twitter:image" content="https://nextjs.org/og.png" /> <meta name="twitter:image:alt" content="Next.js Logo" /> <meta name="twitter:app:name:iphone" content="twitter_app" /> <meta name="twitter:app:id:iphone" content="twitter_app://iphone" /> <meta name="twitter:app:id:ipad" content="twitter_app://ipad" /> <meta name="twitter:app:id:googleplay" content="twitter_app://googleplay" /> <meta name="twitter:app:url:iphone" content="https://iphone_url" /> <meta name="twitter:app:url:ipad" content="https://ipad_url" /> <meta name="twitter:app:name:ipad" content="twitter_app" /> <meta name="twitter:app:name:googleplay" content="twitter_app" /> ### [`viewport`](#viewport) > **Deprecated**: The `viewport` option in `metadata` is deprecated as of Next.js 14. Please use the [`viewport` configuration](/docs/app/api-reference/functions/generate-viewport) instead. ### [`verification`](#verification) layout.js | page.js export const metadata = { verification: { google: 'google', yandex: 'yandex', yahoo: 'yahoo', other: { me: ['my-email', 'my-link'], }, }, } <head> output <meta name="google-site-verification" content="google" /> <meta name="y_key" content="yahoo" /> <meta name="yandex-verification" content="yandex" /> <meta name="me" content="my-email" /> <meta name="me" content="my-link" /> ### [`appleWebApp`](#applewebapp) layout.js | page.js export const metadata = { itunes: { appId: 'myAppStoreID', appArgument: 'myAppArgument', }, appleWebApp: { title: 'Apple Web App', statusBarStyle: 'black-translucent', startupImage: [ '/assets/startup/apple-touch-startup-image-768x1004.png', { url: '/assets/startup/apple-touch-startup-image-1536x2008.png', media: '(device-width: 768px) and (device-height: 1024px)', }, ], }, } <head> output <meta name="apple-itunes-app" content="app-id=myAppStoreID, app-argument=myAppArgument" /> <meta name="apple-mobile-web-app-capable" content="yes" /> <meta name="apple-mobile-web-app-title" content="Apple Web App" /> <link href="/assets/startup/apple-touch-startup-image-768x1004.png" rel="apple-touch-startup-image" /> <link href="/assets/startup/apple-touch-startup-image-1536x2008.png" media="(device-width: 768px) and (device-height: 1024px)" rel="apple-touch-startup-image" /> <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" /> ### [`alternates`](#alternates) layout.js | page.js export const metadata = { alternates: { canonical: 'https://nextjs.org', languages: { 'en-US': 'https://nextjs.org/en-US', 'de-DE': 'https://nextjs.org/de-DE', }, media: { 'only screen and (max-width: 600px)': 'https://nextjs.org/mobile', }, types: { 'application/rss+xml': 'https://nextjs.org/rss', }, }, } <head> output <link rel="canonical" href="https://nextjs.org" /> <link rel="alternate" hreflang="en-US" href="https://nextjs.org/en-US" /> <link rel="alternate" hreflang="de-DE" href="https://nextjs.org/de-DE" /> <link rel="alternate" media="only screen and (max-width: 600px)" href="https://nextjs.org/mobile" /> <link rel="alternate" type="application/rss+xml" href="https://nextjs.org/rss" /> ### [`appLinks`](#applinks) layout.js | page.js export const metadata = { appLinks: { ios: { url: 'https://nextjs.org/ios', app_store_id: 'app_store_id', }, android: { package: 'com.example.android/package', app_name: 'app_name_android', }, web: { url: 'https://nextjs.org/web', should_fallback: true, }, }, } <head> output <meta property="al:ios:url" content="https://nextjs.org/ios" /> <meta property="al:ios:app_store_id" content="app_store_id" /> <meta property="al:android:package" content="com.example.android/package" /> <meta property="al:android:app_name" content="app_name_android" /> <meta property="al:web:url" content="https://nextjs.org/web" /> <meta property="al:web:should_fallback" content="true" /> ### [`archives`](#archives) Describes a collection of records, documents, or other materials of historical interest ([source](https://www.w3.org/TR/2011/WD-html5-20110113/links.html#rel-archives)). layout.js | page.js export const metadata = { archives: ['https://nextjs.org/13'], } <head> output <link rel="archives" href="https://nextjs.org/13" /> ### [`assets`](#assets) layout.js | page.js export const metadata = { assets: ['https://nextjs.org/assets'], } <head> output <link rel="assets" href="https://nextjs.org/assets" /> ### [`bookmarks`](#bookmarks) layout.js | page.js export const metadata = { bookmarks: ['https://nextjs.org/13'], } <head> output <link rel="bookmarks" href="https://nextjs.org/13" /> ### [`category`](#category) layout.js | page.js export const metadata = { category: 'technology', } <head> output <meta name="category" content="technology" /> ### [`other`](#other) All metadata options should be covered using the built-in support. However, there may be custom metadata tags specific to your site, or brand new metadata tags just released. You can use the `other` option to render any custom metadata tag. layout.js | page.js export const metadata = { other: { custom: 'meta', }, } <head> output <meta name="custom" content="meta" /> If you want to generate multiple same key meta tags you can use array value. layout.js | page.js export const metadata = { other: { custom: ['meta1', 'meta2'], }, } <head> output <meta name="custom" content="meta1" /> <meta name="custom" content="meta2" /> [Unsupported Metadata](#unsupported-metadata) --------------------------------------------- The following metadata types do not currently have built-in support. However, they can still be rendered in the layout or page itself. Metadata Recommendation `<meta http-equiv="...">` Use appropriate HTTP Headers via [`redirect()`](/docs/app/api-reference/functions/redirect), [Middleware](/docs/app/building-your-application/routing/middleware#nextresponse), [Security Headers](/docs/app/api-reference/next-config-js/headers) `<base>` Render the tag in the layout or page itself. `<noscript>` Render the tag in the layout or page itself. `<style>` Learn more about [styling in Next.js](/docs/app/building-your-application/styling/css-modules). `<script>` Learn more about [using scripts](/docs/app/building-your-application/optimizing/scripts). `<link rel="stylesheet" />` `import` stylesheets directly in the layout or page itself. `<link rel="preload />` Use [ReactDOM preload method](#link-relpreload) `<link rel="preconnect" />` Use [ReactDOM preconnect method](#link-relpreconnect) `<link rel="dns-prefetch" />` Use [ReactDOM prefetchDNS method](#link-reldns-prefetch) ### [Resource hints](#resource-hints) The `<link>` element has a number of `rel` keywords that can be used to hint to the browser that an external resource is likely to be needed. The browser uses this information to apply preloading optimizations depending on the keyword. While the Metadata API doesn't directly support these hints, you can use new [`ReactDOM` methods](https://github.com/facebook/react/pull/26237) to safely insert them into the `<head>` of the document. app/preload-resources.tsx TypeScript JavaScriptTypeScript 'use client' import ReactDOM from 'react-dom' export function PreloadResources() { ReactDOM.preload('...', { as: '...' }) ReactDOM.preconnect('...', { crossOrigin: '...' }) ReactDOM.prefetchDNS('...') return null } ##### [`<link rel="preload">`](#link-relpreload) Start loading a resource early in the page rendering (browser) lifecycle. [MDN Docs](https://developer.mozilla.org/docs/Web/HTML/Attributes/rel/preload). ReactDOM.preload(href: string, options: { as: string }) <head> output <link rel="preload" href="..." as="..." /> ##### [`<link rel="preconnect">`](#link-relpreconnect) Preemptively initiate a connection to an origin. [MDN Docs](https://developer.mozilla.org/docs/Web/HTML/Attributes/rel/preconnect). ReactDOM.preconnect(href: string, options?: { crossOrigin?: string }) <head> output <link rel="preconnect" href="..." crossorigin /> ##### [`<link rel="dns-prefetch">`](#link-reldns-prefetch) Attempt to resolve a domain name before resources get requested. [MDN Docs](https://developer.mozilla.org/docs/Web/HTML/Attributes/rel/dns-prefetch). ReactDOM.prefetchDNS(href: string) <head> output <link rel="dns-prefetch" href="..." /> > **Good to know**: > > * These methods are currently only supported in Client Components, which are still Server Side Rendered on initial page load. > * Next.js in-built features such as `next/font`, `next/image` and `next/script` automatically handle relevant resource hints. > * React 18.3 does not yet include type definitions for `ReactDOM.preload`, `ReactDOM.preconnect`, and `ReactDOM.preconnectDNS`. You can use `// @ts-ignore` as a temporary solution to avoid type errors. [Types](#types) --------------- You can add type safety to your metadata by using the `Metadata` type. If you are using the [built-in TypeScript plugin](/docs/app/building-your-application/configuring/typescript) in your IDE, you do not need to manually add the type, but you can still explicitly add it if you want. ### [`metadata` object](#metadata-object) import type { Metadata } from 'next' export const metadata: Metadata = { title: 'Next.js', } ### [`generateMetadata` function](#generatemetadata-function-1) #### [Regular function](#regular-function) import type { Metadata } from 'next' export function generateMetadata(): Metadata { return { title: 'Next.js', } } #### [Async function](#async-function) import type { Metadata } from 'next' export async function generateMetadata(): Promise<Metadata> { return { title: 'Next.js', } } #### [With segment props](#with-segment-props) import type { Metadata } from 'next' type Props = { params: { id: string } searchParams: { [key: string]: string | string[] | undefined } } export function generateMetadata({ params, searchParams }: Props): Metadata { return { title: 'Next.js', } } export default function Page({ params, searchParams }: Props) {} #### [With parent metadata](#with-parent-metadata) import type { Metadata, ResolvingMetadata } from 'next' export async function generateMetadata( { params, searchParams }: Props, parent: ResolvingMetadata ): Promise<Metadata> { return { title: 'Next.js', } } #### [JavaScript Projects](#javascript-projects) For JavaScript projects, you can use JSDoc to add type safety. /** @type {import("next").Metadata} */ export const metadata = { title: 'Next.js', } [Version History](#version-history) ----------------------------------- Version Changes `v13.2.0` `viewport`, `themeColor`, and `colorScheme` deprecated in favor of the [`viewport` configuration](/docs/app/api-reference/functions/generate-viewport). `v13.2.0` `metadata` and `generateMetadata` introduced. Next Steps ---------- View all the Metadata API options. [ App Router ... File Conventions ### Metadata Files API documentation for the metadata file conventions. ](/docs/app/api-reference/file-conventions/metadata)[ App Router ... Functions ### generateViewport API Reference for the generateViewport function. ](/docs/app/api-reference/functions/generate-viewport)[ App Router ... Optimizing ### Metadata Use the Metadata API to define metadata in any layout or page. ](/docs/app/building-your-application/optimizing/metadata) [Previous generateImageMetadata ](/docs/app/api-reference/functions/generate-image-metadata) [Next generateSitemaps ](/docs/app/api-reference/functions/generate-sitemaps) Was this helpful? supported. Send

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Learn more about each approach by exploring their respective documentation: [ ### CSS Modules Style your Next.js Application with CSS Modules, Global Styles, and external stylesheets. ](/docs/app/building-your-application/styling/css-modules)[ ### Tailwind CSS Style your Next.js Application using Tailwind CSS. ](/docs/app/building-your-application/styling/tailwind-css)[ ### CSS-in-JS Use CSS-in-JS libraries with Next.js ](/docs/app/building-your-application/styling/css-in-js)[ ### Sass Style your Next.js application using Sass. ](/docs/app/building-your-application/styling/sass) [Previous Caching ](/docs/app/building-your-application/caching) [Next CSS Modules ](/docs/app/building-your-application/styling/css-modules) Was this helpful? supported. Send

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Router](/docs/app)[...](/docs/app/building-your-application)[Styling](/docs/app/building-your-application/styling)Tailwind CSS Tailwind CSS ============ [Tailwind CSS](https://tailwindcss.com/) is a utility-first CSS framework that works exceptionally well with Next.js. [Installing Tailwind](#installing-tailwind) ------------------------------------------- Install the Tailwind CSS packages and run the `init` command to generate both the `tailwind.config.js` and `postcss.config.js` files: Terminal npm install -D tailwindcss postcss autoprefixer npx tailwindcss init -p [Configuring Tailwind](#configuring-tailwind) --------------------------------------------- Inside `tailwind.config.js`, add paths to the files that will use Tailwind CSS class names: tailwind.config.js /** @type {import('tailwindcss').Config} */ module.exports = { content: [ './app/**/*.{js,ts,jsx,tsx,mdx}', // Note the addition of the `app` directory. './pages/**/*.{js,ts,jsx,tsx,mdx}', './components/**/*.{js,ts,jsx,tsx,mdx}', // Or if using `src` directory: './src/**/*.{js,ts,jsx,tsx,mdx}', ], theme: { extend: {}, }, plugins: [], } You do not need to modify `postcss.config.js`. [Importing Styles](#importing-styles) ------------------------------------- Add the [Tailwind CSS directives](https://tailwindcss.com/docs/functions-and-directives#directives) that Tailwind will use to inject its generated styles to a [Global Stylesheet](/docs/app/building-your-application/styling/css-modules#global-styles) in your application, for example: app/globals.css @tailwind base; @tailwind components; @tailwind utilities; Inside the [root layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required) (`app/layout.tsx`), import the `globals.css` stylesheet to apply the styles to every route in your application. app/layout.tsx TypeScript JavaScriptTypeScript import type { Metadata } from 'next' // These styles apply to every route in the application import './globals.css' export const metadata: Metadata = { title: 'Create Next App', description: 'Generated by create next app', } export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body>{children}</body> </html> ) } [Using Classes](#using-classes) ------------------------------- After installing Tailwind CSS and adding the global styles, you can use Tailwind's utility classes in your application. app/page.tsx TypeScript JavaScriptTypeScript export default function Page() { return <h1 className="text-3xl font-bold underline">Hello, Next.js!</h1> } [Usage with Turbopack](#usage-with-turbopack) --------------------------------------------- As of Next.js 13.1, Tailwind CSS and PostCSS are supported with [Turbopack](https://turbo.build/pack/docs/features/css#tailwind-css). [Previous CSS Modules ](/docs/app/building-your-application/styling/css-modules) [Next CSS-in-JS ](/docs/app/building-your-application/styling/css-in-js) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Pages](#pages) * [Layouts](#layouts) * [Root Layout (Required)](#root-layout-required) * [Nesting Layouts](#nesting-layouts) * [Templates](#templates) * [Metadata](#metadata) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/02-pages-and-layouts.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Pages and Layouts Pages and Layouts ================= > We recommend reading the [Routing Fundamentals](/docs/app/building-your-application/routing) and [Defining Routes](/docs/app/building-your-application/routing/defining-routes) pages before continuing. The special files [layout.js](#layouts), [page.js](#pages), and [template.js](#templates) allow you to create UI for a [route](/docs/app/building-your-application/routing/defining-routes#creating-routes). This page will guide you through how and when to use these special files. [Pages](#pages) --------------- A page is UI that is **unique** to a route. You can define a page by default exporting a component from a `page.js` file. For example, to create your `index` page, add the `page.js` file inside the `app` directory:  app/page.tsx TypeScript JavaScriptTypeScript // `app/page.tsx` is the UI for the `/` URL export default function Page() { return <h1>Hello, Home page!</h1> } Then, to create further pages, create a new folder and add the `page.js` file inside it. For example, to create a page for the `/dashboard` route, create a new folder called `dashboard`, and add the `page.js` file inside it: app/dashboard/page.tsx TypeScript JavaScriptTypeScript // `app/dashboard/page.tsx` is the UI for the `/dashboard` URL export default function Page() { return <h1>Hello, Dashboard Page!</h1> } > **Good to know**: > > * The `.js`, `.jsx`, or `.tsx` file extensions can be used for Pages. > * A page is always the [leaf](/docs/app/building-your-application/routing#terminology) of the [route subtree](/docs/app/building-your-application/routing#terminology). > * A `page.js` file is required to make a route segment publicly accessible. > * Pages are [Server Components](/docs/app/building-your-application/rendering/server-components) by default, but can be set to a [Client Component](/docs/app/building-your-application/rendering/client-components). > * Pages can fetch data. View the [Data Fetching](/docs/app/building-your-application/data-fetching) section for more information. [Layouts](#layouts) ------------------- A layout is UI that is **shared** between multiple routes. On navigation, layouts preserve state, remain interactive, and do not re-render. Layouts can also be [nested](#nesting-layouts). You can define a layout by default exporting a React component from a `layout.js` file. The component should accept a `children` prop that will be populated with a child layout (if it exists) or a page during rendering. For example, the layout will be shared with the `/dashboard` and `/dashboard/settings` pages:  app/dashboard/layout.tsx TypeScript JavaScriptTypeScript export default function DashboardLayout({ children, // will be a page or nested layout }: { children: React.ReactNode }) { return ( <section> {/* Include shared UI here e.g. a header or sidebar */} <nav></nav> {children} </section> ) } ### [Root Layout (Required)](#root-layout-required) The root layout is defined at the top level of the `app` directory and applies to all routes. This layout is **required** and must contain `html` and `body` tags, allowing you to modify the initial HTML returned from the server. app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body> {/* Layout UI */} <main>{children}</main> </body> </html> ) } ### [Nesting Layouts](#nesting-layouts) By default, layouts in the folder hierarchy are **nested**, which means they wrap child layouts via their `children` prop. You can nest layouts by adding `layout.js` inside specific route segments (folders). For example, to create a layout for the `/dashboard` route, add a new `layout.js` file inside the `dashboard` folder:  app/dashboard/layout.tsx TypeScript JavaScriptTypeScript export default function DashboardLayout({ children, }: { children: React.ReactNode }) { return <section>{children}</section> } If you were to combine the two layouts above, the root layout (`app/layout.js`) would wrap the dashboard layout (`app/dashboard/layout.js`), which would wrap route segments inside `app/dashboard/*`. The two layouts would be nested as such:  > **Good to know**: > > * `.js`, `.jsx`, or `.tsx` file extensions can be used for Layouts. > * Only the root layout can contain `<html>` and `<body>` tags. > * When a `layout.js` and `page.js` file are defined in the same folder, the layout will wrap the page. > * Layouts are [Server Components](/docs/app/building-your-application/rendering/server-components) by default but can be set to a [Client Component](/docs/app/building-your-application/rendering/client-components). > * Layouts can fetch data. View the [Data Fetching](/docs/app/building-your-application/data-fetching) section for more information. > * Passing data between a parent layout and its children is not possible. However, you can fetch the same data in a route more than once, and React will [automatically dedupe the requests](/docs/app/building-your-application/caching#request-memoization) without affecting performance. > * Layouts do not have access to the route segments below itself. To access all route segments, you can use [`useSelectedLayoutSegment`](/docs/app/api-reference/functions/use-selected-layout-segment) or [`useSelectedLayoutSegments`](/docs/app/api-reference/functions/use-selected-layout-segments) in a Client Component. > * You can use [Route Groups](/docs/app/building-your-application/routing/route-groups) to opt specific route segments in and out of shared layouts. > * You can use [Route Groups](/docs/app/building-your-application/routing/route-groups) to create multiple root layouts. See an [example here](/docs/app/building-your-application/routing/route-groups#creating-multiple-root-layouts). > * **Migrating from the `pages` directory:** The root layout replaces the [`_app.js`](/docs/pages/building-your-application/routing/custom-app) and [`_document.js`](/docs/pages/building-your-application/routing/custom-document) files. [View the migration guide](/docs/app/building-your-application/upgrading/app-router-migration#migrating-_documentjs-and-_appjs). [Templates](#templates) ----------------------- Templates are similar to layouts in that they wrap each child layout or page. Unlike layouts that persist across routes and maintain state, templates create a new instance for each of their children on navigation. This means that when a user navigates between routes that share a template, a new instance of the component is mounted, DOM elements are recreated, state is **not** preserved, and effects are re-synchronized. There may be cases where you need those specific behaviors, and templates would be a more suitable option than layouts. For example: * Features that rely on `useEffect` (e.g logging page views) and `useState` (e.g a per-page feedback form). * To change the default framework behavior. For example, Suspense Boundaries inside layouts only show the fallback the first time the Layout is loaded and not when switching pages. For templates, the fallback is shown on each navigation. A template can be defined by exporting a default React component from a `template.js` file. The component should accept a `children` prop.  app/template.tsx TypeScript JavaScriptTypeScript export default function Template({ children }: { children: React.ReactNode }) { return <div>{children}</div> } In terms of nesting, `template.js` is rendered between a layout and its children. Here's a simplified output: Output <Layout> {/* Note that the template is given a unique key. */} <Template key={routeParam}>{children}</Template> </Layout> [Metadata](#metadata) --------------------- In the `app` directory, you can modify the `<head>` HTML elements such as `title` and `meta` using the [Metadata APIs](/docs/app/building-your-application/optimizing/metadata). Metadata can be defined by exporting a [`metadata` object](/docs/app/api-reference/functions/generate-metadata#the-metadata-object) or [`generateMetadata` function](/docs/app/api-reference/functions/generate-metadata#generatemetadata-function) in a [`layout.js`](/docs/app/api-reference/file-conventions/layout) or [`page.js`](/docs/app/api-reference/file-conventions/page) file. app/page.tsx TypeScript JavaScriptTypeScript import { Metadata } from 'next' export const metadata: Metadata = { title: 'Next.js', } export default function Page() { return '...' } > **Good to know**: You should **not** manually add `<head>` tags such as `<title>` and `<meta>` to root layouts. Instead, you should use the [Metadata API](/docs/app/api-reference/functions/generate-metadata) which automatically handles advanced requirements such as streaming and de-duplicating `<head>` elements. Learn more about available metadata options in the [API reference](/docs/app/api-reference/functions/generate-metadata) [Previous Defining Routes ](/docs/app/building-your-application/routing/defining-routes) [Next Linking and Navigating ](/docs/app/building-your-application/routing/linking-and-navigating) Was this helpful? supported. Send

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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Creating Routes](#creating-routes) * [Creating UI](#creating-ui) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/01-defining-routes.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Defining Routes Defining Routes =============== > We recommend reading the [Routing Fundamentals](/docs/app/building-your-application/routing) page before continuing. This page will guide you through how to define and organize routes in your Next.js application. [Creating Routes](#creating-routes) ----------------------------------- Next.js uses a file-system based router where **folders** are used to define routes. Each folder represents a [**route** segment](/docs/app/building-your-application/routing#route-segments) that maps to a **URL** segment. To create a [nested route](/docs/app/building-your-application/routing#nested-routes), you can nest folders inside each other.  A special [`page.js` file](/docs/app/building-your-application/routing/pages-and-layouts#pages) is used to make route segments publicly accessible.  In this example, the `/dashboard/analytics` URL path is _not_ publicly accessible because it does not have a corresponding `page.js` file. This folder could be used to store components, stylesheets, images, or other colocated files. > **Good to know**: `.js`, `.jsx`, or `.tsx` file extensions can be used for special files. [Creating UI](#creating-ui) --------------------------- [Special file conventions](/docs/app/building-your-application/routing#file-conventions) are used to create UI for each route segment. The most common are [pages](/docs/app/building-your-application/routing/pages-and-layouts#pages) to show UI unique to a route, and [layouts](/docs/app/building-your-application/routing/pages-and-layouts#layouts) to show UI that is shared across multiple routes. For example, to create your first page, add a `page.js` file inside the `app` directory and export a React component: app/page.tsx TypeScript JavaScriptTypeScript export default function Page() { return <h1>Hello, Next.js!</h1> } Next Steps ---------- Learn more about creating pages and layouts. [ App Router ... Routing ### Pages and Layouts Create your first page and shared layout with the App Router. ](/docs/app/building-your-application/routing/pages-and-layouts) [Previous Routing ](/docs/app/building-your-application/routing) [Next Pages and Layouts ](/docs/app/building-your-application/routing/pages-and-layouts) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Parameters](#parameters) * [Returns](#returns) * [Single Dynamic Segment](#single-dynamic-segment) * [Multiple Dynamic Segments](#multiple-dynamic-segments) * [Catch-all Dynamic Segment](#catch-all-dynamic-segment) * [Examples](#examples) * [Multiple Dynamic Segments in a Route](#multiple-dynamic-segments-in-a-route) * [Generate params from the bottom up](#generate-params-from-the-bottom-up) * [Generate params from the top down](#generate-params-from-the-top-down) * [Generate only a subset of params](#generate-only-a-subset-of-params) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/generate-static-params.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)generateStaticParams generateStaticParams ==================== The `generateStaticParams` function can be used in combination with [dynamic route segments](/docs/app/building-your-application/routing/dynamic-routes) to [**statically generate**](/docs/app/building-your-application/rendering/server-components#static-rendering-default) routes at build time instead of on-demand at request time. app/blog/\[slug\]/page.js // Return a list of `params` to populate the [slug] dynamic segment export async function generateStaticParams() { const posts = await fetch('https://.../posts').then((res) => res.json()) return posts.map((post) => ({ slug: post.slug, })) } // Multiple versions of this page will be statically generated // using the `params` returned by `generateStaticParams` export default function Page({ params }) { const { slug } = params // ... } > **Good to know** > > * You can use the [`dynamicParams`](/docs/app/api-reference/file-conventions/route-segment-config#dynamicparams) segment config option to control what happens when a dynamic segment is visited that was not generated with `generateStaticParams`. > * During `next dev`, `generateStaticParams` will be called when you navigate to a route. > * During `next build`, `generateStaticParams` runs before the corresponding Layouts or Pages are generated. > * During revalidation (ISR), `generateStaticParams` will not be called again. > * `generateStaticParams` replaces the [`getStaticPaths`](/docs/pages/api-reference/functions/get-static-paths) function in the Pages Router. [Parameters](#parameters) ------------------------- `options.params` (optional) If multiple dynamic segments in a route use `generateStaticParams`, the child `generateStaticParams` function is executed once for each set of `params` the parent generates. The `params` object contains the populated `params` from the parent `generateStaticParams`, which can be used to [generate the `params` in a child segment](#multiple-dynamic-segments-in-a-route). [Returns](#returns) ------------------- `generateStaticParams` should return an array of objects where each object represents the populated dynamic segments of a single route. * Each property in the object is a dynamic segment to be filled in for the route. * The properties name is the segment's name, and the properties value is what that segment should be filled in with. Example Route `generateStaticParams` Return Type `/product/[id]` `{ id: string }[]` `/products/[category]/[product]` `{ category: string, product: string }[]` `/products/[...slug]` `{ slug: string[] }[]` [Single Dynamic Segment](#single-dynamic-segment) ------------------------------------------------- app/product/\[id\]/page.tsx TypeScript JavaScriptTypeScript export function generateStaticParams() { return [{ id: '1' }, { id: '2' }, { id: '3' }] } // Three versions of this page will be statically generated // using the `params` returned by `generateStaticParams` // - /product/1 // - /product/2 // - /product/3 export default function Page({ params }: { params: { id: string } }) { const { id } = params // ... } [Multiple Dynamic Segments](#multiple-dynamic-segments) ------------------------------------------------------- app/products/\[category\]/\[product\]/page.tsx TypeScript JavaScriptTypeScript export function generateStaticParams() { return [ { category: 'a', product: '1' }, { category: 'b', product: '2' }, { category: 'c', product: '3' }, ] } // Three versions of this page will be statically generated // using the `params` returned by `generateStaticParams` // - /products/a/1 // - /products/b/2 // - /products/c/3 export default function Page({ params, }: { params: { category: string; product: string } }) { const { category, product } = params // ... } [Catch-all Dynamic Segment](#catch-all-dynamic-segment) ------------------------------------------------------- app/product/\[...slug\]/page.tsx TypeScript JavaScriptTypeScript export function generateStaticParams() { return [{ slug: ['a', '1'] }, { slug: ['b', '2'] }, { slug: ['c', '3'] }] } // Three versions of this page will be statically generated // using the `params` returned by `generateStaticParams` // - /product/a/1 // - /product/b/2 // - /product/c/3 export default function Page({ params }: { params: { slug: string[] } }) { const { slug } = params // ... } [Examples](#examples) --------------------- ### [Multiple Dynamic Segments in a Route](#multiple-dynamic-segments-in-a-route) You can generate params for dynamic segments above the current layout or page, but **not below**. For example, given the `app/products/[category]/[product]` route: * `app/products/[category]/[product]/page.js` can generate params for **both** `[category]` and `[product]`. * `app/products/[category]/layout.js` can **only** generate params for `[category]`. There are two approaches to generating params for a route with multiple dynamic segments: ### [Generate params from the bottom up](#generate-params-from-the-bottom-up) Generate multiple dynamic segments from the child route segment. app/products/\[category\]/\[product\]/page.tsx TypeScript JavaScriptTypeScript // Generate segments for both [category] and [product] export async function generateStaticParams() { const products = await fetch('https://.../products').then((res) => res.json()) return products.map((product) => ({ category: product.category.slug, product: product.id, })) } export default function Page({ params, }: { params: { category: string; product: string } }) { // ... } ### [Generate params from the top down](#generate-params-from-the-top-down) Generate the parent segments first and use the result to generate the child segments. app/products/\[category\]/layout.tsx TypeScript JavaScriptTypeScript // Generate segments for [category] export async function generateStaticParams() { const products = await fetch('https://.../products').then((res) => res.json()) return products.map((product) => ({ category: product.category.slug, })) } export default function Layout({ params }: { params: { category: string } }) { // ... } A child route segment's `generateStaticParams` function is executed once for each segment a parent `generateStaticParams` generates. The child `generateStaticParams` function can use the `params` returned from the parent `generateStaticParams` function to dynamically generate its own segments. app/products/\[category\]/\[product\]/page.tsx TypeScript JavaScriptTypeScript // Generate segments for [product] using the `params` passed from // the parent segment's `generateStaticParams` function export async function generateStaticParams({ params: { category }, }: { params: { category: string } }) { const products = await fetch( `https://.../products?category=${category}` ).then((res) => res.json()) return products.map((product) => ({ product: product.id, })) } export default function Page({ params, }: { params: { category: string; product: string } }) { // ... } > **Good to know**: `fetch` requests are automatically [memoized](/docs/app/building-your-application/caching#request-memoization) for the same data across all `generate`\-prefixed functions, Layouts, Pages, and Server Components. React [`cache` can be used](/docs/app/building-your-application/caching#request-memoization) if `fetch` is unavailable. ### [Generate only a subset of params](#generate-only-a-subset-of-params) You can generate a subset of params for a route by returning an array of objects with only the dynamic segments you want to generate. Then, by using the [`dynamicParams`](/docs/app/api-reference/file-conventions/route-segment-config#dynamicparams) segment config option, you can control what happens when a dynamic segment is visited that was not generated with `generateStaticParams`. app/blog/\[slug\]/page.js // All posts besides the top 10 will be a 404 export const dynamicParams = false export async function generateStaticParams() { const posts = await fetch('https://.../posts').then((res) => res.json()) const topPosts = posts.slice(0, 10) return topPosts.map((post) => ({ slug: post.slug, })) } [Version History](#version-history) ----------------------------------- Version Changes `v13.0.0` `generateStaticParams` introduced. [Previous generateSitemaps ](/docs/app/api-reference/functions/generate-sitemaps) [Next generateViewport ](/docs/app/api-reference/functions/generate-viewport) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Caching](#caching) * [Robots, Favicons, and others](#robots-favicons-and-others) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/06-optimizing/11-static-assets.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Optimizing](/docs/app/building-your-application/optimizing)Static Assets Static Assets in \`public\` =========================== Next.js can serve static files, like images, under a folder called `public` in the root directory. Files inside `public` can then be referenced by your code starting from the base URL (`/`). For example, the file `public/avatars/me.png` can be viewed by visiting the `/avatars/me.png` path. The code to display that image might look like: avatar.js import Image from 'next/image' export function Avatar({ id, alt }) { return <Image src={`/avatars/${id}.png`} alt={alt} width="64" height="64" /> } export function AvatarOfMe() { return <Avatar id="me" alt="A portrait of me" /> } [Caching](#caching) ------------------- Next.js cannot safely cache assets in the `public` folder because they may change. The default caching headers applied are: Cache-Control: public, max-age=0 [Robots, Favicons, and others](#robots-favicons-and-others) ----------------------------------------------------------- For static metadata files, such as `robots.txt`, `favicon.ico`, etc, you should use [special metadata files](/docs/app/api-reference/file-conventions/metadata) inside the `app` folder. > Good to know: > > * The directory must be named `public`. The name cannot be changed and it's the only directory used to serve static assets. > * Only assets that are in the `public` directory at [build time](/docs/app/api-reference/next-cli#build) will be served by Next.js. Files added at request time won't be available. We recommend using a third-party service like [Vercel Blob](https://vercel.com/docs/storage/vercel-blob?utm_source=next-site&utm_medium=docs&utm_campaign=next-website) for persistent file storage. 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [CSS Modules](#css-modules) * [Example](#example) * [Global Styles](#global-styles) * [External Stylesheets](#external-stylesheets) * [Ordering and Merging](#ordering-and-merging) * [Additional Features](#additional-features) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/05-styling/01-css-modules.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Styling](/docs/app/building-your-application/styling)CSS Modules CSS Modules and Global Styles ============================= Next.js supports different types of stylesheets, including: * [CSS Modules](#css-modules) * [Global Styles](#global-styles) * [External Stylesheets](#external-stylesheets) [CSS Modules](#css-modules) --------------------------- Next.js has built-in support for CSS Modules using the `.module.css` extension. CSS Modules locally scope CSS by automatically creating a unique class name. This allows you to use the same class name in different files without worrying about collisions. This behavior makes CSS Modules the ideal way to include component-level CSS. [Example](#example) ------------------- CSS Modules can be imported into any file inside the `app` directory: app/dashboard/layout.tsx TypeScript JavaScriptTypeScript import styles from './styles.module.css' export default function DashboardLayout({ children, }: { children: React.ReactNode }) { return <section className={styles.dashboard}>{children}</section> } app/dashboard/styles.module.css .dashboard { padding: 24px; } CSS Modules are **only enabled for files with the `.module.css` and `.module.sass` extensions**. In production, all CSS Module files will be automatically concatenated into **many minified and code-split** `.css` files. These `.css` files represent hot execution paths in your application, ensuring the minimal amount of CSS is loaded for your application to paint. [Global Styles](#global-styles) ------------------------------- Global styles can be imported into any layout, page, or component inside the `app` directory. > **Good to know**: This is different from the `pages` directory, where you can only import global styles inside the `_app.js` file. For example, consider a stylesheet named `app/global.css`: body { padding: 20px 20px 60px; max-width: 680px; margin: 0 auto; } Inside the root layout (`app/layout.js`), import the `global.css` stylesheet to apply the styles to every route in your application: app/layout.tsx TypeScript JavaScriptTypeScript // These styles apply to every route in the application import './global.css' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body>{children}</body> </html> ) } [External Stylesheets](#external-stylesheets) --------------------------------------------- Stylesheets published by external packages can be imported anywhere in the `app` directory, including colocated components: app/layout.tsx TypeScript JavaScriptTypeScript import 'bootstrap/dist/css/bootstrap.css' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body className="container">{children}</body> </html> ) } > **Good to know**: External stylesheets must be directly imported from an npm package or downloaded and colocated with your codebase. You cannot use `<link rel="stylesheet" />`. [Ordering and Merging](#ordering-and-merging) --------------------------------------------- Next.js optimizes CSS during production builds by automatically chunking (merging) stylesheets. The CSS order is determined by the order in which you import the stylesheets into your application code. For example, `base-button.module.css` will be ordered before `page.module.css` since `<BaseButton>` is imported first in `<Page>`: base-button.tsx TypeScript JavaScriptTypeScript import styles from './base-button.module.css' export function BaseButton() { return <button className={styles.primary} /> } page.ts TypeScript JavaScriptTypeScript import { BaseButton } from './base-button' import styles from './page.module.css' export function Page() { return <BaseButton className={styles.primary} /> } To maintain a predictable order, we recommend the following: * Only import a CSS file in a single JS/TS file. * If using global class names, import the global styles in the same file in the order you want them to be applied. * Prefer CSS Modules over global styles. * Use a consistent naming convention for your CSS modules. For example, using `<name>.module.css` over `<name>.tsx`. * Extract shared styles into a separate shared component. * If using [Tailwind](/docs/app/building-your-application/styling/tailwind-css), import the stylesheet at the top of the file, preferably in the [Root Layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required). > **Good to know:** CSS ordering behaves differently in development mode, always ensure to check preview deployments to verify the final CSS order in your production build. [Additional Features](#additional-features) ------------------------------------------- Next.js includes additional features to improve the authoring experience of adding styles: * When running locally with `next dev`, local stylesheets (either global or CSS modules) will take advantage of [Fast Refresh](/docs/architecture/fast-refresh) to instantly reflect changes as edits are saved. * When building for production with `next build`, CSS files will be bundled into fewer minified `.css` files to reduce the number of network requests needed to retrieve styles. * If you disable JavaScript, styles will still be loaded in the production build (`next start`). However, JavaScript is still required for `next dev` to enable [Fast Refresh](/docs/architecture/fast-refresh). [Previous Styling ](/docs/app/building-your-application/styling) [Next Tailwind CSS ](/docs/app/building-your-application/styling/tailwind-css) Was this helpful? supported. Send

https://nextjs.org/docs/app/building-your-application/optimizing/third-party-libraries

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Getting Started](#getting-started) * [Google Third-Parties](#google-third-parties) * [Google Tag Manager](#google-tag-manager) * [Sending Events](#sending-events) * [Options](#options) * [Google Analytics](#google-analytics) * [Sending Events](#sending-events-1) * [Tracking Pageviews](#tracking-pageviews) * [Options](#options-1) * [Google Maps Embed](#google-maps-embed) * [Options](#options-2) * [YouTube Embed](#youtube-embed) * [Options](#options-3) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/06-optimizing/12-third-party-libraries.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Optimizing](/docs/app/building-your-application/optimizing)Third Party Libraries Third Party Libraries ===================== **`@next/third-parties`** is a library that provides a collection of components and utilities that improve the performance and developer experience of loading popular third-party libraries in your Next.js application. All third-party integrations provided by `@next/third-parties` have been optimized for performance and ease of use. [Getting Started](#getting-started) ----------------------------------- To get started, install the `@next/third-parties` library: Terminal npm install @next/third-parties@latest next@latest `@next/third-parties` is currently an **experimental** library under active development. We recommend installing it with the **latest** or **canary** flags while we work on adding more third-party integrations. [Google Third-Parties](#google-third-parties) --------------------------------------------- All supported third-party libraries from Google can be imported from `@next/third-parties/google`. ### [Google Tag Manager](#google-tag-manager) The `GoogleTagManager` component can be used to instantiate a [Google Tag Manager](https://developers.google.com/tag-platform/tag-manager) container to your page. By default, it fetches the original inline script after hydration occurs on the page. To load Google Tag Manager for all routes, include the component directly in your root layout and pass in your GTM container ID: app/layout.tsx TypeScript JavaScriptTypeScript import { GoogleTagManager } from '@next/third-parties/google' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <GoogleTagManager gtmId="GTM-XYZ" /> <body>{children}</body> </html> ) } To load Google Tag Manager for a single route, include the component in your page file: app/page.js import { GoogleTagManager } from '@next/third-parties/google' export default function Page() { return <GoogleTagManager gtmId="GTM-XYZ" /> } #### [Sending Events](#sending-events) The `sendGTMEvent` function can be used to track user interactions on your page by sending events using the `dataLayer` object. For this function to work, the `<GoogleTagManager />` component must be included in either a parent layout, page, or component, or directly in the same file. app/page.js 'use client' import { sendGTMEvent } from '@next/third-parties/google' export function EventButton() { return ( <div> <button onClick={() => sendGTMEvent({ event: 'buttonClicked', value: 'xyz' })} > Send Event </button> </div> ) } Refer to the Tag Manager [developer documentation](https://developers.google.com/tag-platform/tag-manager/datalayer) to learn about the different variables and events that can be passed into the function. #### [Options](#options) Options to pass to the Google Tag Manager. For a full list of options, read the [Google Tag Manager docs](https://developers.google.com/tag-platform/tag-manager/datalayer). Name Type Description `gtmId` Required Your GTM container ID. Usually starts with `GTM-`. `dataLayer` Optional Data layer array to instantiate the container with. Defaults to an empty array. `dataLayerName` Optional Name of the data layer. Defaults to `dataLayer`. `auth` Optional Value of authentication parameter (`gtm_auth`) for environment snippets. `preview` Optional Value of preview parameter (`gtm_preview`) for environment snippets. ### [Google Analytics](#google-analytics) The `GoogleAnalytics` component can be used to include [Google Analytics 4](https://developers.google.com/analytics/devguides/collection/ga4) to your page via the Google tag (`gtag.js`). By default, it fetches the original scripts after hydration occurs on the page. > **Recommendation**: If Google Tag Manager is already included in your application, you can configure Google Analytics directly using it, rather than including Google Analytics as a separate component. Refer to the [documentation](https://developers.google.com/analytics/devguides/collection/ga4/tag-options#what-is-gtm) to learn more about the differences between Tag Manager and `gtag.js`. To load Google Analytics for all routes, include the component directly in your root layout and pass in your measurement ID: app/layout.tsx TypeScript JavaScriptTypeScript import { GoogleAnalytics } from '@next/third-parties/google' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body>{children}</body> <GoogleAnalytics gaId="G-XYZ" /> </html> ) } To load Google Analytics for a single route, include the component in your page file: app/page.js import { GoogleAnalytics } from '@next/third-parties/google' export default function Page() { return <GoogleAnalytics gaId="G-XYZ" /> } #### [Sending Events](#sending-events-1) The `sendGAEvent` function can be used to measure user interactions on your page by sending events using the `dataLayer` object. For this function to work, the `<GoogleAnalytics />` component must be included in either a parent layout, page, or component, or directly in the same file. app/page.js 'use client' import { sendGAEvent } from '@next/third-parties/google' export function EventButton() { return ( <div> <button onClick={() => sendGAEvent({ event: 'buttonClicked', value: 'xyz' })} > Send Event </button> </div> ) } Refer to the Google Analytics [developer documentation](https://developers.google.com/analytics/devguides/collection/ga4/event-parameters) to learn more about event parameters. #### [Tracking Pageviews](#tracking-pageviews) Google Analytics automatically tracks pageviews when the browser history state changes. This means that client-side navigations between Next.js routes will send pageview data without any configuration. To ensure that client-side navigations are being measured correctly, verify that the [_“Enhanced Measurement”_](https://support.google.com/analytics/answer/9216061#enable_disable) property is enabled in your Admin panel and the _“Page changes based on browser history events”_ checkbox is selected. > **Note**: If you decide to manually send pageview events, make sure to disable the default pageview measurement to avoid having duplicate data. Refer to the Google Analytics [developer documentation](https://developers.google.com/analytics/devguides/collection/ga4/views?client_type=gtag#manual_pageviews) to learn more. #### [Options](#options-1) Options to pass to the `<GoogleAnalytics>` component. Name Type Description `gaId` Required Your [measurement ID](https://support.google.com/analytics/answer/12270356). Usually starts with `G-`. `dataLayerName` Optional Name of the data layer. Defaults to `dataLayer`. ### [Google Maps Embed](#google-maps-embed) The `GoogleMapsEmbed` component can be used to add a [Google Maps Embed](https://developers.google.com/maps/documentation/embed/embedding-map) to your page. By default, it uses the `loading` attribute to lazy-load the embed below the fold. app/page.js import { GoogleMapsEmbed } from '@next/third-parties/google' export default function Page() { return ( <GoogleMapsEmbed apiKey="XYZ" height={200} width="100%" mode="place" q="Brooklyn+Bridge,New+York,NY" /> ) } #### [Options](#options-2) Options to pass to the Google Maps Embed. For a full list of options, read the [Google Map Embed docs](https://developers.google.com/maps/documentation/embed/embedding-map). Name Type Description `apiKey` Required Your api key. `mode` Required [Map mode](https://developers.google.com/maps/documentation/embed/embedding-map#choosing_map_modes) `height` Optional Height of the embed. Defaults to `auto`. `width` Optional Width of the embed. Defaults to `auto`. `style` Optional Pass styles to the iframe. `allowfullscreen` Optional Property to allow certain map parts to go full screen. `loading` Optional Defaults to lazy. Consider changing if you know your embed will be above the fold. `q` Optional Defines map marker location. _This may be required depending on the map mode_. `center` Optional Defines the center of the map view. `zoom` Optional Sets initial zoom level of the map. `maptype` Optional Defines type of map tiles to load. `language` Optional Defines the language to use for UI elements and for the display of labels on map tiles. `region` Optional Defines the appropriate borders and labels to display, based on geo-political sensitivities. ### [YouTube Embed](#youtube-embed) The `YouTubeEmbed` component can be used to load and display a YouTube embed. This component loads faster by using [`lite-youtube-embed`](https://github.com/paulirish/lite-youtube-embed) under the hood. app/page.js import { YouTubeEmbed } from '@next/third-parties/google' export default function Page() { return <YouTubeEmbed videoid="ogfYd705cRs" height={400} params="controls=0" /> } #### [Options](#options-3) Name Type Description `videoid` Required YouTube video id. `width` Optional Width of the video container. Defaults to `auto` `height` Optional Height of the video container. Defaults to `auto` `playlabel` Optional A visually hidden label for the play button for accessibility. `params` Optional The video player params defined [here](https://developers.google.com/youtube/player_parameters#Parameters). Params are passed as a query param string. Eg: `params="controls=0&start=10&end=30"` `style` Optional Used to apply styles to the video container. 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(CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Why Switch?](#why-switch) * [Slow initial page loading time](#slow-initial-page-loading-time) * [No automatic code splitting](#no-automatic-code-splitting) * [Network waterfalls](#network-waterfalls) * [Fast and intentional loading states](#fast-and-intentional-loading-states) * [Choose the data fetching strategy](#choose-the-data-fetching-strategy) * [Middleware](#middleware) * [Built-in Optimizations](#built-in-optimizations) * [Migration Steps](#migration-steps) * [Step 1: Install the Next.js Dependency](#step-1-install-the-nextjs-dependency) * [Step 2: Create the Next.js Configuration File](#step-2-create-the-nextjs-configuration-file) * [Step 3: Update TypeScript Configuration](#step-3-update-typescript-configuration) * [Step 4: Create the Root Layout](#step-4-create-the-root-layout) * [Step 5: Metadata](#step-5-metadata) * [Step 6: Styles](#step-6-styles) * [Step 7: Create the Entrypoint Page](#step-7-create-the-entrypoint-page) * [Step 8: Update Static Image Imports](#step-8-update-static-image-imports) * [Step 9: Migrate the Environment Variables](#step-9-migrate-the-environment-variables) * [Step 10: Update Scripts in package.json](#step-10-update-scripts-in-packagejson) * [Step 11: Clean Up](#step-11-clean-up) * [Bundler Compatibility](#bundler-compatibility) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/11-upgrading/05-from-create-react-app.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Upgrading](/docs/app/building-your-application/upgrading)Migrating from Create React App Migrating from Create React App =============================== This guide will help you migrate an existing Create React App site to Next.js. [Why Switch?](#why-switch) -------------------------- There are several reasons why you might want to switch from Create React App to Next.js: ### [Slow initial page loading time](#slow-initial-page-loading-time) Create React App uses purely client-side React. Client-side only applications, also known as single-page applications (SPAs), often experience slow initial page loading time. This happens due to a couple of reasons: 1. The browser needs to wait for the React code and your entire application bundle to download and run before your code is able to send requests to load data. 2. Your application code grows with every new feature and dependency you add. ### [No automatic code splitting](#no-automatic-code-splitting) The previous issue of slow loading times can be somewhat managed with code splitting. However, if you try to do code splitting manually, you'll often make performance worse. It's easy to inadvertently introduce network waterfalls when code-splitting manually. Next.js provides automatic code splitting built into its router. ### [Network waterfalls](#network-waterfalls) A common cause of poor performance occurs when applications make sequential client-server requests to fetch data. One common pattern for data fetching in an SPA is to initially render a placeholder, and then fetch data after the component has mounted. Unfortunately, this means that a child component that fetches data can't start fetching until the parent component has finished loading its own data. While fetching data on the client is supported with Next.js, it also gives you the option to shift data fetching to the server, which can eliminate client-server waterfalls. ### [Fast and intentional loading states](#fast-and-intentional-loading-states) With built-in support for [streaming through React Suspense](/docs/app/building-your-application/routing/loading-ui-and-streaming#streaming-with-suspense), you can be more intentional about which parts of your UI you want to load first and in what order without introducing network waterfalls. This enables you to build pages that are faster to load and eliminate [layout shifts](https://vercel.com/blog/how-core-web-vitals-affect-seo). ### [Choose the data fetching strategy](#choose-the-data-fetching-strategy) Depending on your needs, Next.js allows you to choose your data fetching strategy on a page and component basis. You can decide to fetch at build time, at request time on the server, or on the client. For example, you can fetch data from your CMS and render your blog posts at build time, which can then be efficiently cached on a CDN. ### [Middleware](#middleware) [Next.js Middleware](/docs/app/building-your-application/routing/middleware) allows you to run code on the server before a request is completed. This is especially useful to avoid having a flash of unauthenticated content when the user visits an authenticated-only page by redirecting the user to a login page. The middleware is also useful for experimentation and [internationalization](/docs/app/building-your-application/routing/internationalization). ### [Built-in Optimizations](#built-in-optimizations) [Images](/docs/app/building-your-application/optimizing/images), [fonts](/docs/app/building-your-application/optimizing/fonts), and [third-party scripts](/docs/app/building-your-application/optimizing/scripts) often have significant impact on an application's performance. Next.js comes with built-in components that automatically optimize those for you. [Migration Steps](#migration-steps) ----------------------------------- Our goal with this migration is to get a working Next.js application as quickly as possible, so that you can then adopt Next.js features incrementally. To begin with, we'll keep it as a purely client-side application (SPA) without migrating your existing router. This helps minimize the chances of encountering issues during the migration process and reduces merge conflicts. ### [Step 1: Install the Next.js Dependency](#step-1-install-the-nextjs-dependency) The first thing you need to do is to install `next` as a dependency: Terminal npm install next@latest ### [Step 2: Create the Next.js Configuration File](#step-2-create-the-nextjs-configuration-file) Create a `next.config.mjs` at the root of your project. This file will hold your [Next.js configuration options](/docs/app/api-reference/next-config-js). next.config.mjs /** @type {import('next').NextConfig} */ const nextConfig = { output: 'export', // Outputs a Single-Page Application (SPA). distDir: './dist', // Changes the build output directory to `./dist/`. } export default nextConfig ### [Step 3: Update TypeScript Configuration](#step-3-update-typescript-configuration) If you're using TypeScript, you need to update your `tsconfig.json` file with the following changes to make it compatible with Next.js: tsconfig.json { "compilerOptions": { "target": "es5", "lib": ["dom", "dom.iterable", "esnext"], "allowJs": true, "skipLibCheck": true, "strict": false, "forceConsistentCasingInFileNames": true, "noEmit": true, "esModuleInterop": true, "module": "esnext", "moduleResolution": "node", "resolveJsonModule": true, "isolatedModules": true, "jsx": "preserve", "baseUrl": ".", "incremental": true, "plugins": [ { "name": "next" } ], "strictNullChecks": true }, "include": [ "next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts", "./dist/types/**/*.ts" ], "exclude": ["node_modules"] } You can find more information about configuring TypeScript on the [Next.js docs](/docs/app/building-your-application/configuring/typescript#typescript-plugin). ### [Step 4: Create the Root Layout](#step-4-create-the-root-layout) A Next.js [App Router](/docs/app) application must include a [root layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required) file, which is a [React Server Component](/docs/app/building-your-application/rendering/server-components) that will wrap all pages in your application. This file is defined at the top level of the `app` directory. The closest equivalent to the root layout file in a CRA application is the `index.html` file, which contains your `<html>`, `<head>`, and `<body>` tags. In this step, you'll convert your `index.html` file into a root layout file: 1. Create a new `app` directory in your `src` directory. 2. Create a new `layout.tsx` file inside that `app` directory: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return null } > **Good to know**: `.js`, `.jsx`, or `.tsx` extensions can be used for Layout files. Copy the content of your `index.html` file into the previously created `<RootLayout>` component while replacing the `body.div#root` and `body.script` tags with `<div id="root">{children}</div>`: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <head> <meta charset="UTF-8" /> <link rel="icon" href="%PUBLIC_URL%/favicon.ico" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <title>React App</title> <meta name="description" content="Web site created..." /> </head> <body> <div id="root">{children}</div> </body> </html> ) } > **Good to know**: We'll ignore the [manifest file](/docs/app/api-reference/file-conventions/metadata), additional iconography other than the favicon, and [testing configuration](/docs/app/building-your-application/testing), but if these are requirements, Next.js also supports these options. ### [Step 5: Metadata](#step-5-metadata) Next.js already includes by default the [meta charset](https://developer.mozilla.org/docs/Web/HTML/Element/meta#charset) and [meta viewport](https://developer.mozilla.org/docs/Web/HTML/Viewport_meta_tag) tags, so you can safely remove those from your `<head>`: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <head> <link rel="icon" href="%PUBLIC_URL%/favicon.ico" /> <title>React App</title> <meta name="description" content="Web site created..." /> </head> <body> <div id="root">{children}</div> </body> </html> ) } Any [metadata files](/docs/app/building-your-application/optimizing/metadata#file-based-metadata) such as `favicon.ico`, `icon.png`, `robots.txt` are automatically added to the application `<head>` tag as long as you have them placed into the top level of the `app` directory. After moving [all supported files](/docs/app/building-your-application/optimizing/metadata#file-based-metadata) into the `app` directory you can safely delete their `<link>` tags: app/layout.tsx TypeScript JavaScriptTypeScript export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <head> <title>React App</title> <meta name="description" content="Web site created..." /> </head> <body> <div id="root">{children}</div> </body> </html> ) } Finally, Next.js can manage your last `<head>` tags with the [Metadata API](/docs/app/building-your-application/optimizing/metadata). Move your final metadata info into an exported [`metadata` object](/docs/app/api-reference/functions/generate-metadata#metadata-object): app/layout.tsx TypeScript JavaScriptTypeScript import type { Metadata } from 'next' export const metadata: Metadata = { title: 'React App', description: 'Web site created with Next.js.', } export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html lang="en"> <body> <div id="root">{children}</div> </body> </html> ) } With the above changes, you shifted from declaring everything in your `index.html` to using Next.js' convention-based approach built into the framework ([Metadata API](/docs/app/building-your-application/optimizing/metadata)). This approach enables you to more easily improve your SEO and web shareability of your pages. ### [Step 6: Styles](#step-6-styles) Like Create React App, Next.js has built-in support for [CSS Modules](/docs/app/building-your-application/styling/css-modules). If you're using a global CSS file, import it into your `app/layout.tsx` file: app/layout.tsx TypeScript JavaScriptTypeScript import '../index.css' // ... If you're using Tailwind, you'll need to install `postcss` and `autoprefixer`: Terminal npm install postcss autoprefixer Then, create a `postcss.config.js` file at the root of your project: postcss.config.js module.exports = { plugins: { tailwindcss: {}, autoprefixer: {}, }, } ### [Step 7: Create the Entrypoint Page](#step-7-create-the-entrypoint-page) On Next.js you declare an entrypoint for your application by creating a `page.tsx` file. The closest equivalent of this file on CRA is your `src/index.tsx` file. In this step, you’ll set up the entry point of your application. **Create a `[[...slug]]` directory in your `app` directory.** Since this guide is aiming to first set up our Next.js as an SPA (Single Page Application), you need your page entry point to catch all possible routes of your application. For that, create a new `[[...slug]]` directory in your `app` directory. This directory is what is called an [optional catch-all route segment](/docs/app/building-your-application/routing/dynamic-routes#optional-catch-all-segments). Next.js uses a file-system based router where [directories are used to define routes](/docs/app/building-your-application/routing/defining-routes#creating-routes). This special directory will make sure that all routes of your application will be directed to its containing `page.tsx` file. **Create a new `page.tsx` file inside the `app/[[...slug]]` directory with the following content:** app/\[\[...slug\]\]/page.tsx TypeScript JavaScriptTypeScript import '../../index.css' export function generateStaticParams() { return [{ slug: [''] }] } export default function Page() { return '...' // We'll update this } This file is a [Server Component](/docs/app/building-your-application/rendering/server-components). When you run `next build`, the file is prerendered into a static asset. It does _not_ require any dynamic code. This file imports our global CSS and tells [`generateStaticParams`](/docs/app/api-reference/functions/generate-static-params) we are only going to generate one route, the index route at `/`. Now, let's move the rest of our CRA application which will run client-only. app/\[\[...slug\]\]/client.tsx TypeScript JavaScriptTypeScript 'use client' import React from 'react' import dynamic from 'next/dynamic' const App = dynamic(() => import('../../App'), { ssr: false }) export function ClientOnly() { return <App /> } This file is a [Client Component](/docs/app/building-your-application/rendering/client-components), defined by the `'use client'` directive. Client Components are still [prerendered to HTML](/docs/app/building-your-application/rendering/client-components#how-are-client-components-rendered) on the server before being sent to the client. Since we want a client-only application to start, we can configure Next.js to disable prerendering from the `App` component down. const App = dynamic(() => import('../../App'), { ssr: false }) Now, update your entrypoint page to use the new component: app/\[\[...slug\]\]/page.tsx TypeScript JavaScriptTypeScript import '../../index.css' import { ClientOnly } from './client' export function generateStaticParams() { return [{ slug: [''] }] } export default function Page() { return <ClientOnly /> } ### [Step 8: Update Static Image Imports](#step-8-update-static-image-imports) Next.js handles static image imports slightly different from CRA. With CRA, importing an image file will return its public URL as a string: App.tsx import image from './img.png' export default function App() { return <img src={image} /> } With Next.js, static image imports return an object. The object can then be used directly with the Next.js [`<Image>` component](/docs/app/api-reference/components/image), or you can use the object's `src` property with your existing `<img>` tag. The `<Image>` component has the added benefits of [automatic image optimization](/docs/app/building-your-application/optimizing/images). The `<Image>` component automatically sets the `width` and `height` attributes of the resulting `<img>` based on the image's dimensions. This prevents layout shifts when the image loads. However, this can cause issues if your app contains images with only one of their dimensions being styled without the other styled to `auto`. When not styled to `auto`, the dimension will default to the `<img>` dimension attribute's value, which can cause the image to appear distorted. Keeping the `<img>` tag will reduce the amount of changes in your application and prevent the above issues. You can then optionally later migrate to the `<Image>` component to take advantage of optimizing images by [configuring a loader](/docs/app/building-your-application/optimizing/images#loaders), or moving to the default Next.js server which has automatic image optimization. **Convert absolute import paths for images imported from `/public` into relative imports:** // Before import logo from '/logo.png' // After import logo from '../public/logo.png' **Pass the image `src` property instead of the whole image object to your `<img>` tag:** // Before <img src={logo} /> // After <img src={logo.src} /> Alternatively, you can reference the public URL for the image asset based on the filename. For example, `public/logo.png` will serve the image at `/logo.png` for your application, which would be the `src` value. > **Warning:** If you're using TypeScript, you might encounter type errors when accessing the `src` property. You can safely ignore those for now. They will be fixed by the end of this guide. ### [Step 9: Migrate the Environment Variables](#step-9-migrate-the-environment-variables) Next.js has support for `.env` [environment variables](/docs/app/building-your-application/configuring/environment-variables) similar to CRA. The main difference is the prefix used to expose environment variables on the client-side. Change all environment variables with the `REACT_APP_` prefix to `NEXT_PUBLIC_`. ### [Step 10: Update Scripts in `package.json`](#step-10-update-scripts-in-packagejson) You should now be able to run your application to test if you successfully migrated to Next.js. But before that, you need to update your `scripts` in your `package.json` with Next.js related commands, and add `.next`, `next-env.d.ts`, and `dist` to your `.gitignore` file: package.json { "scripts": { "dev": "next dev", "build": "next build", "start": "next start" } } .gitignore # ... .next next-env.d.ts dist Now run `npm run dev`, and open [`http://localhost:3000`](http://localhost:3000). You should see your application now running on Next.js. ### [Step 11: Clean Up](#step-11-clean-up) You can now clean up your codebase from Create React App related artifacts: * Delete `src/index.tsx` * Delete `public/index.html` * Delete `reportWebVitals` setup * Uninstall CRA dependencies (`react-scripts`) [Bundler Compatibility](#bundler-compatibility) ----------------------------------------------- Create React App and Next.js both default to using webpack for bundling. When migrating your CRA application to Next.js, you might have a custom webpack configuration you're looking to migrate. Next.js supports providing a [custom webpack configuration](/docs/app/api-reference/next-config-js/webpack). Further, Next.js has support for [Turbopack](/docs/app/api-reference/next-config-js/turbo) through `next dev --turbo` to improve your local dev performance. Turbopack supports some [webpack loaders](/docs/app/api-reference/next-config-js/turbo) as well for compatibility and incremental adoption. [Next Steps](#next-steps) ------------------------- If everything went according to plan, you now have a functioning Next.js application running as a single-page application. However, you aren't yet taking advantage of most of Next.js' benefits, but you can now start making incremental changes to reap all the benefits. Here's what you might want to do next: * Migrate from React Router to the [Next.js App Router](/docs/app/building-your-application/routing) to get: * Automatic code splitting * [Streaming Server-Rendering](/docs/app/building-your-application/routing/loading-ui-and-streaming) * [React Server Components](/docs/app/building-your-application/rendering/server-components) * [Optimize images with the `<Image>` component](/docs/app/building-your-application/optimizing/images) * [Optimize fonts with `next/font`](/docs/app/building-your-application/optimizing/fonts) * [Optimize third-party scripts with the `<Script>` component](/docs/app/building-your-application/optimizing/scripts) * [Update your ESLint configuration to support Next.js rules](/docs/app/building-your-application/configuring/eslint) > **Good to know:** Using a static export [does not currently support](https://github.com/vercel/next.js/issues/54393) using the `useParams` hook. [Previous Migrating from Vite ](/docs/app/building-your-application/upgrading/from-vite) [Next API Reference ](/docs/app/api-reference) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [The viewport object](#the-viewport-object) * [generateViewport function](#generateviewport-function) * [Viewport Fields](#viewport-fields) * [themeColor](#themecolor) * [width, initialScale, maximumScale and userScalable](#width-initialscale-maximumscale-and-userscalable) * [colorScheme](#colorscheme) * [Types](#types) * [viewport object](#viewport-object) * [generateViewport function](#generateviewport-function-1) * [Regular function](#regular-function) * [With segment props](#with-segment-props) * [JavaScript Projects](#javascript-projects) * [Version History](#version-history) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/generate-viewport.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)generateViewport generateViewport ================ You can customize the initial viewport of the page with the static `viewport` object or the dynamic `generateViewport` function. > **Good to know**: > > * The `viewport` object and `generateViewport` function exports are **only supported in Server Components**. > * You cannot export both the `viewport` object and `generateViewport` function from the same route segment. > * If you're coming from migrating `metadata` exports, you can use [metadata-to-viewport-export codemod](/docs/app/building-your-application/upgrading/codemods#metadata-to-viewport-export) to update your changes. [The `viewport` object](#the-viewport-object) --------------------------------------------- To define the viewport options, export a `viewport` object from a `layout.jsx` or `page.jsx` file. layout.tsx | page.tsx TypeScript JavaScriptTypeScript import type { Viewport } from 'next' export const viewport: Viewport = { themeColor: 'black', } export default function Page() {} [`generateViewport` function](#generateviewport-function) --------------------------------------------------------- `generateViewport` should return a [`Viewport` object](#viewport-fields) containing one or more viewport fields. layout.tsx | page.tsx TypeScript JavaScriptTypeScript export function generateViewport({ params }) { return { themeColor: '...', } } > **Good to know**: > > * If the viewport doesn't depend on runtime information, it should be defined using the static [`viewport` object](#the-viewport-object) rather than `generateMetadata`. [Viewport Fields](#viewport-fields) ----------------------------------- ### [`themeColor`](#themecolor) Learn more about [`theme-color`](https://developer.mozilla.org/docs/Web/HTML/Element/meta/name/theme-color). **Simple theme color** layout.tsx | page.tsx TypeScript JavaScriptTypeScript import type { Viewport } from 'next' export const viewport: Viewport = { themeColor: 'black', } <head> output <meta name="theme-color" content="black" /> **With media attribute** layout.tsx | page.tsx TypeScript JavaScriptTypeScript import type { Viewport } from 'next' export const viewport: Viewport = { themeColor: [ { media: '(prefers-color-scheme: light)', color: 'cyan' }, { media: '(prefers-color-scheme: dark)', color: 'black' }, ], } <head> output <meta name="theme-color" media="(prefers-color-scheme: light)" content="cyan" /> <meta name="theme-color" media="(prefers-color-scheme: dark)" content="black" /> ### [`width`, `initialScale`, `maximumScale` and `userScalable`](#width-initialscale-maximumscale-and-userscalable) > **Good to know**: The `viewport` meta tag is automatically set, and manual configuration is usually unnecessary as the default is sufficient. However, the information is provided for completeness. layout.tsx | page.tsx TypeScript JavaScriptTypeScript import type { Viewport } from 'next' export const viewport: Viewport = { width: 'device-width', initialScale: 1, maximumScale: 1, userScalable: false, // Also supported by less commonly used // interactiveWidget: 'resizes-visual', } <head> output <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" /> ### [`colorScheme`](#colorscheme) Learn more about [`color-scheme`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta/name#:~:text=color%2Dscheme%3A%20specifies,of%20the%20following%3A). layout.tsx | page.tsx TypeScript JavaScriptTypeScript import type { Viewport } from 'next' export const viewport: Viewport = { colorScheme: 'dark', } <head> output <meta name="color-scheme" content="dark" /> [Types](#types) --------------- You can add type safety to your viewport object by using the `Viewport` type. If you are using the [built-in TypeScript plugin](/docs/app/building-your-application/configuring/typescript) in your IDE, you do not need to manually add the type, but you can still explicitly add it if you want. ### [`viewport` object](#viewport-object) import type { Viewport } from 'next' export const viewport: Viewport = { themeColor: 'black', } ### [`generateViewport` function](#generateviewport-function-1) #### [Regular function](#regular-function) import type { Viewport } from 'next' export function generateViewport(): Viewport { return { themeColor: 'black', } } #### [With segment props](#with-segment-props) import type { Viewport } from 'next' type Props = { params: { id: string } searchParams: { [key: string]: string | string[] | undefined } } export function generateViewport({ params, searchParams }: Props): Viewport { return { themeColor: 'black', } } export default function Page({ params, searchParams }: Props) {} #### [JavaScript Projects](#javascript-projects) For JavaScript projects, you can use JSDoc to add type safety. /** @type {import("next").Viewport} */ export const viewport = { themeColor: 'black', } [Version History](#version-history) ----------------------------------- Version Changes `v14.0.0` `viewport` and `generateViewport` introduced. Next Steps ---------- View all the Metadata API options. [ App Router ... File Conventions ### Metadata Files API documentation for the metadata file conventions. ](/docs/app/api-reference/file-conventions/metadata)[ App Router ... Optimizing ### Metadata Use the Metadata API to define metadata in any layout or page. ](/docs/app/building-your-application/optimizing/metadata) [Previous generateStaticParams ](/docs/app/api-reference/functions/generate-static-params) [Next headers ](/docs/app/api-reference/functions/headers) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [<Link> Component](#link-component) * [Examples](#examples) * [Linking to Dynamic Segments](#linking-to-dynamic-segments) * [Checking Active Links](#checking-active-links) * [Scrolling to an id](#scrolling-to-an-id) * [Disabling scroll restoration](#disabling-scroll-restoration) * [useRouter() hook](#userouter-hook) * [redirect function](#redirect-function) * [Using the native History API](#using-the-native-history-api) * [window.history.pushState](#windowhistorypushstate) * [window.history.replaceState](#windowhistoryreplacestate) * [How Routing and Navigation Works](#how-routing-and-navigation-works) * [1\. Code Splitting](#1-code-splitting) * [2\. Prefetching](#2-prefetching) * [3\. Caching](#3-caching) * [4\. Partial Rendering](#4-partial-rendering) * [5\. Soft Navigation](#5-soft-navigation) * [6\. Back and Forward Navigation](#6-back-and-forward-navigation) * [7\. Routing between pages/ and app/](#7-routing-between-pages-and-app) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/03-linking-and-navigating.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Linking and Navigating Linking and Navigating ====================== There are four ways to navigate between routes in Next.js: * Using the [`<Link>` Component](#link-component) * Using the [`useRouter` hook](#userouter-hook) ([Client Components](/docs/app/building-your-application/rendering/client-components)) * Using the [`redirect` function](#redirect-function) ([Server Components](/docs/app/building-your-application/rendering/server-components)) * Using the native [History API](#using-the-native-history-api) This page will go through how to use each of these options, and dive deeper into how navigation works. [`<Link>` Component](#link-component) ------------------------------------- `<Link>` is a built-in component that extends the HTML `<a>` tag to provide [prefetching](#2-prefetching) and client-side navigation between routes. It is the primary and recommended way to navigate between routes in Next.js. You can use it by importing it from `next/link`, and passing a `href` prop to the component: app/page.tsx TypeScript JavaScriptTypeScript import Link from 'next/link' export default function Page() { return <Link href="/dashboard">Dashboard</Link> } There are other optional props you can pass to `<Link>`. See the [API reference](/docs/app/api-reference/components/link) for more. ### [Examples](#examples) #### [Linking to Dynamic Segments](#linking-to-dynamic-segments) When linking to [dynamic segments](/docs/app/building-your-application/routing/dynamic-routes), you can use [template literals and interpolation](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Template_literals) to generate a list of links. For example, to generate a list of blog posts: app/blog/PostList.js import Link from 'next/link' export default function PostList({ posts }) { return ( <ul> {posts.map((post) => ( <li key={post.id}> <Link href={`/blog/${post.slug}`}>{post.title}</Link> </li> ))} </ul> ) } #### [Checking Active Links](#checking-active-links) You can use [`usePathname()`](/docs/app/api-reference/functions/use-pathname) to determine if a link is active. For example, to add a class to the active link, you can check if the current `pathname` matches the `href` of the link: app/components/links.tsx TypeScript JavaScriptTypeScript 'use client' import { usePathname } from 'next/navigation' import Link from 'next/link' export function Links() { const pathname = usePathname() return ( <nav> <ul> <li> <Link className={`link ${pathname === '/' ? 'active' : ''}`} href="/"> Home </Link> </li> <li> <Link className={`link ${pathname === '/about' ? 'active' : ''}`} href="/about" > About </Link> </li> </ul> </nav> ) } #### [Scrolling to an `id`](#scrolling-to-an-id) The default behavior of the Next.js App Router is to **scroll to the top of a new route or to maintain the scroll position for backwards and forwards navigation.** If you'd like to scroll to a specific `id` on navigation, you can append your URL with a `#` hash link or just pass a hash link to the `href` prop. This is possible since `<Link>` renders to an `<a>` element. <Link href="/dashboard#settings">Settings</Link> // Output <a href="/dashboard#settings">Settings</a> > **Good to know**: > > * Next.js will scroll to the [Page](/docs/app/building-your-application/routing/pages-and-layouts#pages) if it is not visible in the viewport upon navigation. #### [Disabling scroll restoration](#disabling-scroll-restoration) The default behavior of the Next.js App Router is to **scroll to the top of a new route or to maintain the scroll position for backwards and forwards navigation.** If you'd like to disable this behavior, you can pass `scroll={false}` to the `<Link>` component, or `scroll: false` to `router.push()` or `router.replace()`. // next/link <Link href="/dashboard" scroll={false}> Dashboard </Link> // useRouter import { useRouter } from 'next/navigation' const router = useRouter() router.push('/dashboard', { scroll: false }) [`useRouter()` hook](#userouter-hook) ------------------------------------- The `useRouter` hook allows you to programmatically change routes from [Client Components](/docs/app/building-your-application/rendering/client-components). app/page.js 'use client' import { useRouter } from 'next/navigation' export default function Page() { const router = useRouter() return ( <button type="button" onClick={() => router.push('/dashboard')}> Dashboard </button> ) } For a full list of `useRouter` methods, see the [API reference](/docs/app/api-reference/functions/use-router). > **Recommendation:** Use the `<Link>` component to navigate between routes unless you have a specific requirement for using `useRouter`. [`redirect` function](#redirect-function) ----------------------------------------- For [Server Components](/docs/app/building-your-application/rendering/server-components), use the `redirect` function instead. app/team/\[id\]/page.tsx TypeScript JavaScriptTypeScript import { redirect } from 'next/navigation' async function fetchTeam(id: string) { const res = await fetch('https://...') if (!res.ok) return undefined return res.json() } export default async function Profile({ params }: { params: { id: string } }) { const team = await fetchTeam(params.id) if (!team) { redirect('/login') } // ... } > **Good to know**: > > * `redirect` returns a 307 (Temporary Redirect) status code by default. When used in a Server Action, it returns a 303 (See Other), which is commonly used for redirecting to a success page as a result of a POST request. > * `redirect` internally throws an error so it should be called outside of `try/catch` blocks. > * `redirect` can be called in Client Components during the rendering process but not in event handlers. You can use the [`useRouter` hook](#userouter-hook) instead. > * `redirect` also accepts absolute URLs and can be used to redirect to external links. > * If you'd like to redirect before the render process, use [`next.config.js`](/docs/app/building-your-application/routing/redirecting#redirects-in-nextconfigjs) or [Middleware](/docs/app/building-your-application/routing/redirecting#nextresponseredirect-in-middleware). See the [`redirect` API reference](/docs/app/api-reference/functions/redirect) for more information. [Using the native History API](#using-the-native-history-api) ------------------------------------------------------------- Next.js allows you to use the native [`window.history.pushState`](https://developer.mozilla.org/en-US/docs/Web/API/History/pushState) and [`window.history.replaceState`](https://developer.mozilla.org/en-US/docs/Web/API/History/replaceState) methods to update the browser's history stack without reloading the page. `pushState` and `replaceState` calls integrate into the Next.js Router, allowing you to sync with [`usePathname`](/docs/app/api-reference/functions/use-pathname) and [`useSearchParams`](/docs/app/api-reference/functions/use-search-params). ### [`window.history.pushState`](#windowhistorypushstate) Use it to add a new entry to the browser's history stack. The user can navigate back to the previous state. For example, to sort a list of products: 'use client' import { useSearchParams } from 'next/navigation' export default function SortProducts() { const searchParams = useSearchParams() function updateSorting(sortOrder: string) { const params = new URLSearchParams(searchParams.toString()) params.set('sort', sortOrder) window.history.pushState(null, '', `?${params.toString()}`) } return ( <> <button onClick={() => updateSorting('asc')}>Sort Ascending</button> <button onClick={() => updateSorting('desc')}>Sort Descending</button> </> ) } ### [`window.history.replaceState`](#windowhistoryreplacestate) Use it to replace the current entry on the browser's history stack. The user is not able to navigate back to the previous state. For example, to switch the application's locale: 'use client' import { usePathname } from 'next/navigation' export function LocaleSwitcher() { const pathname = usePathname() function switchLocale(locale: string) { // e.g. '/en/about' or '/fr/contact' const newPath = `/${locale}${pathname}` window.history.replaceState(null, '', newPath) } return ( <> <button onClick={() => switchLocale('en')}>English</button> <button onClick={() => switchLocale('fr')}>French</button> </> ) } [How Routing and Navigation Works](#how-routing-and-navigation-works) --------------------------------------------------------------------- The App Router uses a hybrid approach for routing and navigation. On the server, your application code is automatically [code-split](#1-code-splitting) by route segments. And on the client, Next.js [prefetches](#2-prefetching) and [caches](#3-caching) the route segments. This means, when a user navigates to a new route, the browser doesn't reload the page, and only the route segments that change re-render - improving the navigation experience and performance. ### [1\. Code Splitting](#1-code-splitting) Code splitting allows you to split your application code into smaller bundles to be downloaded and executed by the browser. This reduces the amount of data transferred and execution time for each request, leading to improved performance. [Server Components](/docs/app/building-your-application/rendering/server-components) allow your application code to be automatically code-split by route segments. This means only the code needed for the current route is loaded on navigation. ### [2\. Prefetching](#2-prefetching) Prefetching is a way to preload a route in the background before the user visits it. There are two ways routes are prefetched in Next.js: * **`<Link>` component**: Routes are automatically prefetched as they become visible in the user's viewport. Prefetching happens when the page first loads or when it comes into view through scrolling. * **`router.prefetch()`**: The `useRouter` hook can be used to prefetch routes programmatically. The `<Link>`'s default prefetching behavior (i.e. when the `prefetch` prop is left unspecified or set to `null`) is different depending on your usage of [`loading.js`](/docs/app/api-reference/file-conventions/loading). Only the shared layout, down the rendered "tree" of components until the first `loading.js` file, is prefetched and cached for `30s`. This reduces the cost of fetching an entire dynamic route, and it means you can show an [instant loading state](/docs/app/building-your-application/routing/loading-ui-and-streaming#instant-loading-states) for better visual feedback to users. You can disable prefetching by setting the `prefetch` prop to `false`. Alternatively, you can prefetch the full page data beyond the loading boundaries by setting the `prefetch` prop to `true`. See the [`<Link>` API reference](/docs/app/api-reference/components/link) for more information. > **Good to know**: > > * Prefetching is not enabled in development, only in production. ### [3\. Caching](#3-caching) Next.js has an **in-memory client-side cache** called the [Router Cache](/docs/app/building-your-application/caching#router-cache). As users navigate around the app, the React Server Component Payload of [prefetched](#2-prefetching) route segments and visited routes are stored in the cache. This means on navigation, the cache is reused as much as possible, instead of making a new request to the server - improving performance by reducing the number of requests and data transferred. Learn more about how the [Router Cache](/docs/app/building-your-application/caching#router-cache) works and how to configure it. ### [4\. Partial Rendering](#4-partial-rendering) Partial rendering means only the route segments that change on navigation re-render on the client, and any shared segments are preserved. For example, when navigating between two sibling routes, `/dashboard/settings` and `/dashboard/analytics`, the `settings` and `analytics` pages will be rendered, and the shared `dashboard` layout will be preserved.  Without partial rendering, each navigation would cause the full page to re-render on the client. Rendering only the segment that changes reduces the amount of data transferred and execution time, leading to improved performance. ### [5\. Soft Navigation](#5-soft-navigation) Browsers perform a "hard navigation" when navigating between pages. The Next.js App Router enables "soft navigation" between pages, ensuring only the route segments that have changed are re-rendered (partial rendering). This enables client React state to be preserved during navigation. ### [6\. Back and Forward Navigation](#6-back-and-forward-navigation) By default, Next.js will maintain the scroll position for backwards and forwards navigation, and re-use route segments in the [Router Cache](/docs/app/building-your-application/caching#router-cache). ### [7\. Routing between `pages/` and `app/`](#7-routing-between-pages-and-app) When incrementally migrating from `pages/` to `app/`, the Next.js router will automatically handle hard navigation between the two. To detect transitions from `pages/` to `app/`, there is a client router filter that leverages probabilistic checking of app routes, which can occasionally result in false positives. By default, such occurrences should be very rare, as we configure the false positive likelihood to be 0.01%. This likelihood can be customized via the `experimental.clientRouterFilterAllowedRate` option in `next.config.js`. It's important to note that lowering the false positive rate will increase the size of the generated filter in the client bundle. Alternatively, if you prefer to disable this handling completely and manage the routing between `pages/` and `app/` manually, you can set `experimental.clientRouterFilter` to false in `next.config.js`. When this feature is disabled, any dynamic routes in pages that overlap with app routes won't be navigated to properly by default. Next Steps ---------- [ App Router Building Your Application ### Caching An overview of caching mechanisms in Next.js. ](/docs/app/building-your-application/caching)[ App Router ... Configuring ### TypeScript Next.js provides a TypeScript-first development experience for building your React application. ](/docs/app/building-your-application/configuring/typescript) [Previous Pages and Layouts ](/docs/app/building-your-application/routing/pages-and-layouts) [Next Loading UI and Streaming ](/docs/app/building-your-application/routing/loading-ui-and-streaming) Was this helpful? supported. Send

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CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party 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Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Reduce number of dependencies](#reduce-number-of-dependencies) * [Run next build with --experimental-debug-memory-usage](#run-next-build-with---experimental-debug-memory-usage) * [Record a heap profile](#record-a-heap-profile) * [Analyze a snapshot of the heap](#analyze-a-snapshot-of-the-heap) * [Webpack build worker](#webpack-build-worker) * [Disable Webpack cache](#disable-webpack-cache) * [Disable source maps](#disable-source-maps) * [Edge memory issues](#edge-memory-issues) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/06-optimizing/13-memory-usage.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Optimizing](/docs/app/building-your-application/optimizing)Memory Usage Memory Usage ============ As applications grow and become more feature rich, they can demand more resources when developing locally or creating production builds. Let's explore some strategies and techniques to optimize memory and address common memory issues in Next.js. [Reduce number of dependencies](#reduce-number-of-dependencies) --------------------------------------------------------------- Applications with a large amount of dependencies will use more memory. The [Bundle Analyzer](/docs/app/building-your-application/optimizing/bundle-analyzer) can help you investigate large dependencies in your application that may be able to be removed to improve performance and memory usage. [Run `next build` with `--experimental-debug-memory-usage`](#run-next-build-with---experimental-debug-memory-usage) ------------------------------------------------------------------------------------------------------------------- Starting in `14.2.0`, you can run `next build --experimental-debug-memory-usage` to run the build in a mode where Next.js will print out information about memory usage continuously throughout the build, such as heap usage and garbage collection statistics. Heap snapshots will also be taken automatically when memory usage gets close to the configured limit. > **Good to know**: This feature is not compatible with the Webpack build worker option which is auto-enabled unless you have custom webpack config. [Record a heap profile](#record-a-heap-profile) ----------------------------------------------- To look for memory issues, you can record a heap profile from Node.js and load it in Chrome DevTools to identify potential sources of memory leaks. In your terminal, pass the `--heap-prof` flag to Node.js when starting your Next.js build: node --heap-prof node_modules/next/dist/bin/next build At the end of the build, a `.heapprofile` file will be created by Node.js. In Chrome DevTools, you can open the Memory tab and click on the "Load Profile" button to visualize the file. [Analyze a snapshot of the heap](#analyze-a-snapshot-of-the-heap) ----------------------------------------------------------------- You can use an inspector tool to analyze the memory usage of the application. When running the `next build` or `next dev` command, add `NODE_OPTIONS=--inspect` to the beginning of the command. This will expose the inspector agent on the default port. If you wish to break before any user code starts, you can pass `--inspect-brk` instead. While the process is running, you can use a tool such as Chrome DevTools to connect to the debugging port to record and analyze a snapshot of the heap to see what memory is being retained. Starting in `14.2.0`, you can also run `next build` with the `--experimental-debug-memory-usage` flag to make it easier to take heap snapshots. While running in this mode, you can send a `SIGUSR2` signal to the process at any point, and the process will take a heap snapshot. The heap snapshot will be saved to the project root of the Next.js application and can be loaded in any heap analyzer, such as Chrome DevTools, to see what memory is retained. This mode is not yet compatible with Webpack build workers. See [how to record and analyze heap snapshots](https://developer.chrome.com/docs/devtools/memory-problems/heap-snapshots) for more information. [Webpack build worker](#webpack-build-worker) --------------------------------------------- The Webpack build worker allows you to run Webpack compilations inside a separate Node.js worker which will decrease memory usage of your application during builds. This option is enabled by default if your application does not have a custom Webpack configuration starting in `v14.1.0`. If you are using an older version of Next.js or you have a custom Webpack configuration, you can enable this option by setting `experimental.webpackBuildWorker: true` inside your `next.config.js`. > **Good to know**: This feature may not be compatible with all custom Webpack plugins. [Disable Webpack cache](#disable-webpack-cache) ----------------------------------------------- The [Webpack cache](https://webpack.js.org/configuration/cache/) saves generated Webpack modules in memory and/or to disk to improve the speed of builds. This can help with performance, but it will also increase the memory usage of your application to store the cached data. You can disable this behavior by adding a [custom Webpack configuration](/docs/app/api-reference/next-config-js/webpack) to your application: next.config.mjs /** @type {import('next').NextConfig} */ const nextConfig = { webpack: ( config, { buildId, dev, isServer, defaultLoaders, nextRuntime, webpack } ) => { if (cfg.cache && !dev) { cfg.cache = Object.freeze({ type: 'memory', }) cfg.cache.maxMemoryGenerations = 0 } // Important: return the modified config return config }, } export default nextConfig [Disable source maps](#disable-source-maps) ------------------------------------------- Generating source maps consumes extra memory during the build process. You can disable source map generation by adding `productionBrowserSourceMaps: false` and `experimental.serverSourceMaps: false` to your Next.js configuration. > **Good to know**: Some plugins may turn on source maps and may require custom configuration to disable. [Edge memory issues](#edge-memory-issues) ----------------------------------------- Next.js `v14.1.3` fixed a memory issue when using the Edge runtime. Please update to this version (or later) to see if it addresses your issue. [Previous Third Party Libraries ](/docs/app/building-your-application/optimizing/third-party-libraries) [Next Configuring ](/docs/app/building-your-application/configuring) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [headers()](#headers) * [API Reference](#api-reference) * [Parameters](#parameters) * [Returns](#returns) * [Examples](#examples) * [Usage with Data Fetching](#usage-with-data-fetching) * [IP Address](#ip-address) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/headers.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)headers headers ======= The `headers` function allows you to read the HTTP incoming request headers from a [Server Component](/docs/app/building-your-application/rendering/server-components). [`headers()`](#headers) ----------------------- This API extends the [Web Headers API](https://developer.mozilla.org/docs/Web/API/Headers). It is **read-only**, meaning you cannot `set` / `delete` the outgoing request headers. app/page.tsx TypeScript JavaScriptTypeScript import { headers } from 'next/headers' export default function Page() { const headersList = headers() const referer = headersList.get('referer') return <div>Referer: {referer}</div> } > **Good to know**: > > * `headers()` is a **[Dynamic Function](/docs/app/building-your-application/rendering/server-components#server-rendering-strategies#dynamic-functions)** whose returned values cannot be known ahead of time. Using it in a layout or page will opt a route into **[dynamic rendering](/docs/app/building-your-application/rendering/server-components#dynamic-rendering)** at request time. ### [API Reference](#api-reference) const headersList = headers() #### [Parameters](#parameters) `headers` does not take any parameters. #### [Returns](#returns) `headers` returns a **read-only** [Web Headers](https://developer.mozilla.org/docs/Web/API/Headers) object. * [`Headers.entries()`](https://developer.mozilla.org/docs/Web/API/Headers/entries): Returns an [`iterator`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Iteration_protocols) allowing to go through all key/value pairs contained in this object. * [`Headers.forEach()`](https://developer.mozilla.org/docs/Web/API/Headers/forEach): Executes a provided function once for each key/value pair in this `Headers` object. * [`Headers.get()`](https://developer.mozilla.org/docs/Web/API/Headers/get): Returns a [`String`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String) sequence of all the values of a header within a `Headers` object with a given name. * [`Headers.has()`](https://developer.mozilla.org/docs/Web/API/Headers/has): Returns a boolean stating whether a `Headers` object contains a certain header. * [`Headers.keys()`](https://developer.mozilla.org/docs/Web/API/Headers/keys): Returns an [`iterator`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Iteration_protocols) allowing you to go through all keys of the key/value pairs contained in this object. * [`Headers.values()`](https://developer.mozilla.org/docs/Web/API/Headers/values): Returns an [`iterator`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Iteration_protocols) allowing you to go through all values of the key/value pairs contained in this object. ### [Examples](#examples) #### [Usage with Data Fetching](#usage-with-data-fetching) `headers()` can be used in combination with [Suspense for Data Fetching](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating). app/page.js import { Suspense } from 'react' import { headers } from 'next/headers' async function User() { const authorization = headers().get('authorization') const res = await fetch('...', { headers: { authorization }, // Forward the authorization header }) const user = await res.json() return <h1>{user.name}</h1> } export default function Page() { return ( <Suspense fallback={null}> <User /> </Suspense> ) } #### [IP Address](#ip-address) `headers()` can be used to get the IP address of the client. app/page.js import { Suspense } from 'react' import { headers } from 'next/headers' function IP() { const FALLBACK_IP_ADDRESS = '0.0.0.0' const forwardedFor = headers().get('x-forwarded-for') if (forwardedFor) { return forwardedFor.split(',')[0] ?? FALLBACK_IP_ADDRESS } return headers().get('x-real-ip') ?? FALLBACK_IP_ADDRESS } export default function Page() { return ( <Suspense fallback={null}> <IP /> </Suspense> ) } In addition to `x-forwarded-for`, `headers()` can also read: * `x-real-ip` * `x-forwarded-host` * `x-forwarded-port` * `x-forwarded-proto` [Version History](#version-history) ----------------------------------- Version Changes `v13.0.0` `headers` introduced. [Previous generateViewport ](/docs/app/api-reference/functions/generate-viewport) [Next ImageResponse ](/docs/app/api-reference/functions/image-response) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Instant Loading States](#instant-loading-states) * [Streaming with Suspense](#streaming-with-suspense) * [What is Streaming?](#what-is-streaming) * [Example](#example) * [SEO](#seo) * [Status Codes](#status-codes) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/04-loading-ui-and-streaming.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Loading UI and Streaming Loading UI and Streaming ======================== The special file `loading.js` helps you create meaningful Loading UI with [React Suspense](https://react.dev/reference/react/Suspense). With this convention, you can show an [instant loading state](#instant-loading-states) from the server while the content of a route segment loads. The new content is automatically swapped in once rendering is complete.  [Instant Loading States](#instant-loading-states) ------------------------------------------------- An instant loading state is fallback UI that is shown immediately upon navigation. You can pre-render loading indicators such as skeletons and spinners, or a small but meaningful part of future screens such as a cover photo, title, etc. This helps users understand the app is responding and provides a better user experience. Create a loading state by adding a `loading.js` file inside a folder.  app/dashboard/loading.tsx TypeScript JavaScriptTypeScript export default function Loading() { // You can add any UI inside Loading, including a Skeleton. return <LoadingSkeleton /> } In the same folder, `loading.js` will be nested inside `layout.js`. It will automatically wrap the `page.js` file and any children below in a `<Suspense>` boundary.  > **Good to know**: > > * Navigation is immediate, even with [server-centric routing](/docs/app/building-your-application/routing/linking-and-navigating#how-routing-and-navigation-works). > * Navigation is interruptible, meaning changing routes does not need to wait for the content of the route to fully load before navigating to another route. > * Shared layouts remain interactive while new route segments load. > **Recommendation:** Use the `loading.js` convention for route segments (layouts and pages) as Next.js optimizes this functionality. [Streaming with Suspense](#streaming-with-suspense) --------------------------------------------------- In addition to `loading.js`, you can also manually create Suspense Boundaries for your own UI components. The App Router supports streaming with [Suspense](https://react.dev/reference/react/Suspense) for both [Node.js and Edge runtimes](/docs/app/building-your-application/rendering/edge-and-nodejs-runtimes). > **Good to know**: > > * [Some browsers](https://bugs.webkit.org/show_bug.cgi?id=252413) buffer a streaming response. You may not see the streamed response until the exceeds 1024 bytes. This typically only affects “hello world” applications, but not real applications. ### [What is Streaming?](#what-is-streaming) To learn how Streaming works in React and Next.js, it's helpful to understand **Server-Side Rendering (SSR)** and its limitations. With SSR, there's a series of steps that need to be completed before a user can see and interact with a page: 1. First, all data for a given page is fetched on the server. 2. The server then renders the HTML for the page. 3. The HTML, CSS, and JavaScript for the page are sent to the client. 4. A non-interactive user interface is shown using the generated HTML, and CSS. 5. Finally, React [hydrates](https://react.dev/reference/react-dom/client/hydrateRoot#hydrating-server-rendered-html) the user interface to make it interactive.  These steps are sequential and blocking, meaning the server can only render the HTML for a page once all the data has been fetched. And, on the client, React can only hydrate the UI once the code for all components in the page has been downloaded. SSR with React and Next.js helps improve the perceived loading performance by showing a non-interactive page to the user as soon as possible.  However, it can still be slow as all data fetching on server needs to be completed before the page can be shown to the user. **Streaming** allows you to break down the page's HTML into smaller chunks and progressively send those chunks from the server to the client.  This enables parts of the page to be displayed sooner, without waiting for all the data to load before any UI can be rendered. Streaming works well with React's component model because each component can be considered a chunk. Components that have higher priority (e.g. product information) or that don't rely on data can be sent first (e.g. layout), and React can start hydration earlier. Components that have lower priority (e.g. reviews, related products) can be sent in the same server request after their data has been fetched.  Streaming is particularly beneficial when you want to prevent long data requests from blocking the page from rendering as it can reduce the [Time To First Byte (TTFB)](https://web.dev/ttfb/) and [First Contentful Paint (FCP)](https://web.dev/first-contentful-paint/). It also helps improve [Time to Interactive (TTI)](https://developer.chrome.com/en/docs/lighthouse/performance/interactive/), especially on slower devices. ### [Example](#example) `<Suspense>` works by wrapping a component that performs an asynchronous action (e.g. fetch data), showing fallback UI (e.g. skeleton, spinner) while it's happening, and then swapping in your component once the action completes. app/dashboard/page.tsx TypeScript JavaScriptTypeScript import { Suspense } from 'react' import { PostFeed, Weather } from './Components' export default function Posts() { return ( <section> <Suspense fallback={<p>Loading feed...</p>}> <PostFeed /> </Suspense> <Suspense fallback={<p>Loading weather...</p>}> <Weather /> </Suspense> </section> ) } By using Suspense, you get the benefits of: 1. **Streaming Server Rendering** - Progressively rendering HTML from the server to the client. 2. **Selective Hydration** - React prioritizes what components to make interactive first based on user interaction. For more Suspense examples and use cases, please see the [React Documentation](https://react.dev/reference/react/Suspense). ### [SEO](#seo) * Next.js will wait for data fetching inside [`generateMetadata`](/docs/app/api-reference/functions/generate-metadata) to complete before streaming UI to the client. This guarantees the first part of a streamed response includes `<head>` tags. * Since streaming is server-rendered, it does not impact SEO. You can use the [Rich Results Test](https://search.google.com/test/rich-results) tool from Google to see how your page appears to Google's web crawlers and view the serialized HTML ([source](https://web.dev/rendering-on-the-web/#seo-considerations)). ### [Status Codes](#status-codes) When streaming, a `200` status code will be returned to signal that the request was successful. The server can still communicate errors or issues to the client within the streamed content itself, for example, when using [`redirect`](/docs/app/api-reference/functions/redirect) or [`notFound`](/docs/app/api-reference/functions/not-found). Since the response headers have already been sent to the client, the status code of the response cannot be updated. This does not affect SEO. [Previous Linking and Navigating ](/docs/app/building-your-application/routing/linking-and-navigating) [Next Error Handling ](/docs/app/building-your-application/routing/error-handling) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Configuring CSS-in-JS in app](#configuring-css-in-js-in-app) * [styled-jsx](#styled-jsx) * [Styled Components](#styled-components) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/05-styling/03-css-in-js.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Styling](/docs/app/building-your-application/styling)CSS-in-JS CSS-in-JS ========= > **Warning:** CSS-in-JS libraries which require runtime JavaScript are not currently supported in Server Components. Using CSS-in-JS with newer React features like Server Components and Streaming requires library authors to support the latest version of React, including [concurrent rendering](https://react.dev/blog/2022/03/29/react-v18#what-is-concurrent-react). > > We're working with the React team on upstream APIs to handle CSS and JavaScript assets with support for React Server Components and streaming architecture. The following libraries are supported in Client Components in the `app` directory (alphabetical): * [`chakra-ui`](https://chakra-ui.com/getting-started/nextjs-app-guide) * [`kuma-ui`](https://kuma-ui.com) * [`@mui/material`](https://mui.com/material-ui/guides/next-js-app-router/) * [`@mui/joy`](https://mui.com/joy-ui/integrations/next-js-app-router/) * [`pandacss`](https://panda-css.com) * [`styled-jsx`](#styled-jsx) * [`styled-components`](#styled-components) * [`stylex`](https://stylexjs.com) * [`tamagui`](https://tamagui.dev/docs/guides/next-js#server-components) * [`tss-react`](https://tss-react.dev/) * [`vanilla-extract`](https://vanilla-extract.style) The following are currently working on support: * [`emotion`](https://github.com/emotion-js/emotion/issues/2928) > **Good to know**: We're testing out different CSS-in-JS libraries and we'll be adding more examples for libraries that support React 18 features and/or the `app` directory. If you want to style Server Components, we recommend using [CSS Modules](/docs/app/building-your-application/styling/css-modules) or other solutions that output CSS files, like PostCSS or [Tailwind CSS](/docs/app/building-your-application/styling/tailwind-css). [Configuring CSS-in-JS in `app`](#configuring-css-in-js-in-app) --------------------------------------------------------------- Configuring CSS-in-JS is a three-step opt-in process that involves: 1. A **style registry** to collect all CSS rules in a render. 2. The new `useServerInsertedHTML` hook to inject rules before any content that might use them. 3. A Client Component that wraps your app with the style registry during initial server-side rendering. ### [`styled-jsx`](#styled-jsx) Using `styled-jsx` in Client Components requires using `v5.1.0`. First, create a new registry: app/registry.tsx TypeScript JavaScriptTypeScript 'use client' import React, { useState } from 'react' import { useServerInsertedHTML } from 'next/navigation' import { StyleRegistry, createStyleRegistry } from 'styled-jsx' export default function StyledJsxRegistry({ children, }: { children: React.ReactNode }) { // Only create stylesheet once with lazy initial state // x-ref: https://reactjs.org/docs/hooks-reference.html#lazy-initial-state const [jsxStyleRegistry] = useState(() => createStyleRegistry()) useServerInsertedHTML(() => { const styles = jsxStyleRegistry.styles() jsxStyleRegistry.flush() return <>{styles}</> }) return <StyleRegistry registry={jsxStyleRegistry}>{children}</StyleRegistry> } Then, wrap your [root layout](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required) with the registry: app/layout.tsx TypeScript JavaScriptTypeScript import StyledJsxRegistry from './registry' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html> <body> <StyledJsxRegistry>{children}</StyledJsxRegistry> </body> </html> ) } [View an example here](https://github.com/vercel/app-playground/tree/main/app/styling/styled-jsx). ### [Styled Components](#styled-components) Below is an example of how to configure `styled-components@6` or newer: First, enable styled-components in `next.config.js`. next.config.js module.exports = { compiler: { styledComponents: true, }, } Then, use the `styled-components` API to create a global registry component to collect all CSS style rules generated during a render, and a function to return those rules. Then use the `useServerInsertedHTML` hook to inject the styles collected in the registry into the `<head>` HTML tag in the root layout. lib/registry.tsx TypeScript JavaScriptTypeScript 'use client' import React, { useState } from 'react' import { useServerInsertedHTML } from 'next/navigation' import { ServerStyleSheet, StyleSheetManager } from 'styled-components' export default function StyledComponentsRegistry({ children, }: { children: React.ReactNode }) { // Only create stylesheet once with lazy initial state // x-ref: https://reactjs.org/docs/hooks-reference.html#lazy-initial-state const [styledComponentsStyleSheet] = useState(() => new ServerStyleSheet()) useServerInsertedHTML(() => { const styles = styledComponentsStyleSheet.getStyleElement() styledComponentsStyleSheet.instance.clearTag() return <>{styles}</> }) if (typeof window !== 'undefined') return <>{children}</> return ( <StyleSheetManager sheet={styledComponentsStyleSheet.instance}> {children} </StyleSheetManager> ) } Wrap the `children` of the root layout with the style registry component: app/layout.tsx TypeScript JavaScriptTypeScript import StyledComponentsRegistry from './lib/registry' export default function RootLayout({ children, }: { children: React.ReactNode }) { return ( <html> <body> <StyledComponentsRegistry>{children}</StyledComponentsRegistry> </body> </html> ) } [View an example here](https://github.com/vercel/app-playground/tree/main/app/styling/styled-components). > **Good to know**: > > * During server rendering, styles will be extracted to a global registry and flushed to the `<head>` of your HTML. This ensures the style rules are placed before any content that might use them. In the future, we may use an upcoming React feature to determine where to inject the styles. > * During streaming, styles from each chunk will be collected and appended to existing styles. After client-side hydration is complete, `styled-components` will take over as usual and inject any further dynamic styles. > * We specifically use a Client Component at the top level of the tree for the style registry because it's more efficient to extract CSS rules this way. It avoids re-generating styles on subsequent server renders, and prevents them from being sent in the Server Component payload. > * For advanced use cases where you need to configure individual properties of styled-components compilation, you can read our [Next.js styled-components API reference](/docs/architecture/nextjs-compiler#styled-components) to learn more. 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Customizing Sass Options](#customizing-sass-options) * [Sass Variables](#sass-variables) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/05-styling/04-sass.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Styling](/docs/app/building-your-application/styling)Sass Sass ==== Next.js has built-in support for integrating with Sass after the package is installed using both the `.scss` and `.sass` extensions. You can use component-level Sass via CSS Modules and the `.module.scss`or `.module.sass` extension. First, install [`sass`](https://github.com/sass/sass): Terminal npm install --save-dev sass > **Good to know**: > > Sass supports [two different syntaxes](https://sass-lang.com/documentation/syntax), each with their own extension. The `.scss` extension requires you use the [SCSS syntax](https://sass-lang.com/documentation/syntax#scss), while the `.sass` extension requires you use the [Indented Syntax ("Sass")](https://sass-lang.com/documentation/syntax#the-indented-syntax). > > If you're not sure which to choose, start with the `.scss` extension which is a superset of CSS, and doesn't require you learn the Indented Syntax ("Sass"). ### [Customizing Sass Options](#customizing-sass-options) If you want to configure the Sass compiler, use `sassOptions` in `next.config.js`. next.config.js const path = require('path') module.exports = { sassOptions: { includePaths: [path.join(__dirname, 'styles')], }, } ### [Sass Variables](#sass-variables) Next.js supports Sass variables exported from CSS Module files. For example, using the exported `primaryColor` Sass variable: app/variables.module.scss $primary-color: #64ff00; :export { primaryColor: $primary-color; } app/page.js // maps to root `/` URL import variables from './variables.module.scss' export default function Page() { return <h1 style={{ color: variables.primaryColor }}>Hello, Next.js!</h1> } [Previous CSS-in-JS ](/docs/app/building-your-application/styling/css-in-js) [Next Optimizing ](/docs/app/building-your-application/optimizing) Was this helpful? supported. Send

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These conformance rules help you use Next.js in an optimal way. ](/docs/app/building-your-application/configuring/eslint)[ ### Environment Variables Learn to add and access environment variables in your Next.js application. ](/docs/app/building-your-application/configuring/environment-variables)[ ### Absolute Imports and Module Path Aliases Configure module path aliases that allow you to remap certain import paths. ](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases)[ ### MDX Learn how to configure MDX and use it in your Next.js apps. ](/docs/app/building-your-application/configuring/mdx)[ ### src Directory Save pages under the \`src\` directory as an alternative to the root \`pages\` directory. ](/docs/app/building-your-application/configuring/src-directory)[ ### Draft Mode Next.js has draft mode to toggle between static and dynamic pages. You can learn how it works with App Router here. ](/docs/app/building-your-application/configuring/draft-mode)[ ### Content Security Policy Learn how to set a Content Security Policy (CSP) for your Next.js application. ](/docs/app/building-your-application/configuring/content-security-policy) [Previous Memory Usage ](/docs/app/building-your-application/optimizing/memory-usage) [Next TypeScript ](/docs/app/building-your-application/configuring/typescript) Was this helpful? supported. Send

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CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party 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Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Supported CSS Properties](#supported-css-properties) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/image-response.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)ImageResponse ImageResponse ============= The `ImageResponse` constructor allows you to generate dynamic images using JSX and CSS. This is useful for generating social media images such as Open Graph images, Twitter cards, and more. The following options are available for `ImageResponse`: import { ImageResponse } from 'next/og' new ImageResponse( element: ReactElement, options: { width?: number = 1200 height?: number = 630 emoji?: 'twemoji' | 'blobmoji' | 'noto' | 'openmoji' = 'twemoji', fonts?: { name: string, data: ArrayBuffer, weight: number, style: 'normal' | 'italic' }[] debug?: boolean = false // Options that will be passed to the HTTP response status?: number = 200 statusText?: string headers?: Record<string, string> }, ) [Supported CSS Properties](#supported-css-properties) ----------------------------------------------------- Please refer to [Satori’s documentation](https://github.com/vercel/satori#css) for a list of supported HTML and CSS features. [Version History](#version-history) ----------------------------------- Version Changes `v14.0.0` `ImageResponse` moved from `next/server` to `next/og` `v13.3.0` `ImageResponse` can be imported from `next/server`. `v13.0.0` `ImageResponse` introduced via `@vercel/og` package. [Previous headers ](/docs/app/api-reference/functions/headers) [Next NextRequest ](/docs/app/api-reference/functions/next-request) Was this helpful? supported. Send

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(CSR)](/docs/pages/building-your-application/rendering/client-side-rendering) * [Edge and Node.js Runtimes](/docs/pages/building-your-application/rendering/edge-and-nodejs-runtimes) * [Data Fetching](/docs/pages/building-your-application/data-fetching) * [getStaticProps](/docs/pages/building-your-application/data-fetching/get-static-props) * [getStaticPaths](/docs/pages/building-your-application/data-fetching/get-static-paths) * [Forms and Mutations](/docs/pages/building-your-application/data-fetching/forms-and-mutations) * [getServerSideProps](/docs/pages/building-your-application/data-fetching/get-server-side-props) * [Incremental Static Regeneration (ISR)](/docs/pages/building-your-application/data-fetching/incremental-static-regeneration) * [Client-side Fetching](/docs/pages/building-your-application/data-fetching/client-side) * [Styling](/docs/pages/building-your-application/styling) * [CSS Modules](/docs/pages/building-your-application/styling/css-modules) * [Tailwind CSS](/docs/pages/building-your-application/styling/tailwind-css) * [CSS-in-JS](/docs/pages/building-your-application/styling/css-in-js) * [Sass](/docs/pages/building-your-application/styling/sass) * [Optimizing](/docs/pages/building-your-application/optimizing) * [Images](/docs/pages/building-your-application/optimizing/images) * [Fonts](/docs/pages/building-your-application/optimizing/fonts) * [Scripts](/docs/pages/building-your-application/optimizing/scripts) * [Static Assets](/docs/pages/building-your-application/optimizing/static-assets) * [Bundle Analyzer](/docs/pages/building-your-application/optimizing/bundle-analyzer) * [Analytics](/docs/pages/building-your-application/optimizing/analytics) * [Lazy Loading](/docs/pages/building-your-application/optimizing/lazy-loading) * [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) * [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) * [Third Party Libraries](/docs/pages/building-your-application/optimizing/third-party-libraries) * [Configuring](/docs/pages/building-your-application/configuring) * [TypeScript](/docs/pages/building-your-application/configuring/typescript) * [ESLint](/docs/pages/building-your-application/configuring/eslint) * [Environment Variables](/docs/pages/building-your-application/configuring/environment-variables) * [Absolute Imports and Module Path Aliases](/docs/pages/building-your-application/configuring/absolute-imports-and-module-aliases) * [src Directory](/docs/pages/building-your-application/configuring/src-directory) * [MDX](/docs/pages/building-your-application/configuring/mdx) * [AMP](/docs/pages/building-your-application/configuring/amp) * [Babel](/docs/pages/building-your-application/configuring/babel) * [PostCSS](/docs/pages/building-your-application/configuring/post-css) * [Custom Server](/docs/pages/building-your-application/configuring/custom-server) * [Draft Mode](/docs/pages/building-your-application/configuring/draft-mode) * [Error Handling](/docs/pages/building-your-application/configuring/error-handling) * [Debugging](/docs/pages/building-your-application/configuring/debugging) * [Preview Mode](/docs/pages/building-your-application/configuring/preview-mode) * [Content Security Policy](/docs/pages/building-your-application/configuring/content-security-policy) * [Testing](/docs/pages/building-your-application/testing) * [Vitest](/docs/pages/building-your-application/testing/vitest) * [Jest](/docs/pages/building-your-application/testing/jest) * [Playwright](/docs/pages/building-your-application/testing/playwright) * [Cypress](/docs/pages/building-your-application/testing/cypress) * [Authentication](/docs/pages/building-your-application/authentication) * [Deploying](/docs/pages/building-your-application/deploying) * [Production Checklist](/docs/pages/building-your-application/deploying/production-checklist) * [Static Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Font Function Arguments](#font-function-arguments) * [src](#src) * [weight](#weight) * [style](#style) * [subsets](#subsets) * [axes](#axes) * [display](#display) * [preload](#preload) * [fallback](#fallback) * [adjustFontFallback](#adjustfontfallback) * [variable](#variable) * [declarations](#declarations) * [Applying Styles](#applying-styles) * [className](#classname) * [style](#style-1) * [CSS Variables](#css-variables) * [Using a font definitions file](#using-a-font-definitions-file) * [Version Changes](#version-changes) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/01-components/font.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Components](/docs/app/api-reference/components)Font Font Module =========== This API reference will help you understand how to use [`next/font/google`](/docs/app/building-your-application/optimizing/fonts#google-fonts) and [`next/font/local`](/docs/app/building-your-application/optimizing/fonts#local-fonts). For features and usage, please see the [Optimizing Fonts](/docs/app/building-your-application/optimizing/fonts) page. ### [Font Function Arguments](#font-function-arguments) For usage, review [Google Fonts](/docs/app/building-your-application/optimizing/fonts#google-fonts) and [Local Fonts](/docs/app/building-your-application/optimizing/fonts#local-fonts). Key `font/google` `font/local` Type Required [`src`](#src) String or Array of Objects Yes [`weight`](#weight) String or Array Required/Optional [`style`](#style) String or Array \- [`subsets`](#subsets) Array of Strings \- [`axes`](#axes) Array of Strings \- [`display`](#display) String \- [`preload`](#preload) Boolean \- [`fallback`](#fallback) Array of Strings \- [`adjustFontFallback`](#adjustfontfallback) Boolean or String \- [`variable`](#variable) String \- [`declarations`](#declarations) Array of Objects \- ### [`src`](#src) The path of the font file as a string or an array of objects (with type `Array<{path: string, weight?: string, style?: string}>`) relative to the directory where the font loader function is called. Used in `next/font/local` * Required Examples: * `src:'./fonts/my-font.woff2'` where `my-font.woff2` is placed in a directory named `fonts` inside the `app` directory * `src:[{path: './inter/Inter-Thin.ttf', weight: '100',},{path: './inter/Inter-Regular.ttf',weight: '400',},{path: './inter/Inter-Bold-Italic.ttf', weight: '700',style: 'italic',},]` * if the font loader function is called in `app/page.tsx` using `src:'../styles/fonts/my-font.ttf'`, then `my-font.ttf` is placed in `styles/fonts` at the root of the project ### [`weight`](#weight) The font [`weight`](https://fonts.google.com/knowledge/glossary/weight) with the following possibilities: * A string with possible values of the weights available for the specific font or a range of values if it's a [variable](https://fonts.google.com/variablefonts) font * An array of weight values if the font is not a [variable google font](https://fonts.google.com/variablefonts). It applies to `next/font/google` only. Used in `next/font/google` and `next/font/local` * Required if the font being used is **not** [variable](https://fonts.google.com/variablefonts) Examples: * `weight: '400'`: A string for a single weight value - for the font [`Inter`](https://fonts.google.com/specimen/Inter?query=inter), the possible values are `'100'`, `'200'`, `'300'`, `'400'`, `'500'`, `'600'`, `'700'`, `'800'`, `'900'` or `'variable'` where `'variable'` is the default) * `weight: '100 900'`: A string for the range between `100` and `900` for a variable font * `weight: ['100','400','900']`: An array of 3 possible values for a non variable font ### [`style`](#style) The font [`style`](https://developer.mozilla.org/docs/Web/CSS/font-style) with the following possibilities: * A string [value](https://developer.mozilla.org/docs/Web/CSS/font-style#values) with default value of `'normal'` * An array of style values if the font is not a [variable google font](https://fonts.google.com/variablefonts). It applies to `next/font/google` only. Used in `next/font/google` and `next/font/local` * Optional Examples: * `style: 'italic'`: A string - it can be `normal` or `italic` for `next/font/google` * `style: 'oblique'`: A string - it can take any value for `next/font/local` but is expected to come from [standard font styles](https://developer.mozilla.org/docs/Web/CSS/font-style) * `style: ['italic','normal']`: An array of 2 values for `next/font/google` - the values are from `normal` and `italic` ### [`subsets`](#subsets) The font [`subsets`](https://fonts.google.com/knowledge/glossary/subsetting) defined by an array of string values with the names of each subset you would like to be [preloaded](/docs/app/building-your-application/optimizing/fonts#specifying-a-subset). Fonts specified via `subsets` will have a link preload tag injected into the head when the [`preload`](#preload) option is true, which is the default. Used in `next/font/google` * Optional Examples: * `subsets: ['latin']`: An array with the subset `latin` You can find a list of all subsets on the Google Fonts page for your font. ### [`axes`](#axes) Some variable fonts have extra `axes` that can be included. By default, only the font weight is included to keep the file size down. The possible values of `axes` depend on the specific font. Used in `next/font/google` * Optional Examples: * `axes: ['slnt']`: An array with value `slnt` for the `Inter` variable font which has `slnt` as additional `axes` as shown [here](https://fonts.google.com/variablefonts?vfquery=inter#font-families). You can find the possible `axes` values for your font by using the filter on the [Google variable fonts page](https://fonts.google.com/variablefonts#font-families) and looking for axes other than `wght` ### [`display`](#display) The font [`display`](https://developer.mozilla.org/docs/Web/CSS/@font-face/font-display) with possible string [values](https://developer.mozilla.org/docs/Web/CSS/@font-face/font-display#values) of `'auto'`, `'block'`, `'swap'`, `'fallback'` or `'optional'` with default value of `'swap'`. Used in `next/font/google` and `next/font/local` * Optional Examples: * `display: 'optional'`: A string assigned to the `optional` value ### [`preload`](#preload) A boolean value that specifies whether the font should be [preloaded](/docs/app/building-your-application/optimizing/fonts#preloading) or not. The default is `true`. Used in `next/font/google` and `next/font/local` * Optional Examples: * `preload: false` ### [`fallback`](#fallback) The fallback font to use if the font cannot be loaded. An array of strings of fallback fonts with no default. * Optional Used in `next/font/google` and `next/font/local` Examples: * `fallback: ['system-ui', 'arial']`: An array setting the fallback fonts to `system-ui` or `arial` ### [`adjustFontFallback`](#adjustfontfallback) * For `next/font/google`: A boolean value that sets whether an automatic fallback font should be used to reduce [Cumulative Layout Shift](https://web.dev/cls/). The default is `true`. * For `next/font/local`: A string or boolean `false` value that sets whether an automatic fallback font should be used to reduce [Cumulative Layout Shift](https://web.dev/cls/). The possible values are `'Arial'`, `'Times New Roman'` or `false`. The default is `'Arial'`. Used in `next/font/google` and `next/font/local` * Optional Examples: * `adjustFontFallback: false`: for `next/font/google` * `adjustFontFallback: 'Times New Roman'`: for `next/font/local` ### [`variable`](#variable) A string value to define the CSS variable name to be used if the style is applied with the [CSS variable method](#css-variables). Used in `next/font/google` and `next/font/local` * Optional Examples: * `variable: '--my-font'`: The CSS variable `--my-font` is declared ### [`declarations`](#declarations) An array of font face [descriptor](https://developer.mozilla.org/docs/Web/CSS/@font-face#descriptors) key-value pairs that define the generated `@font-face` further. Used in `next/font/local` * Optional Examples: * `declarations: [{ prop: 'ascent-override', value: '90%' }]` [Applying Styles](#applying-styles) ----------------------------------- You can apply the font styles in three ways: * [`className`](#classname) * [`style`](#style-1) * [CSS Variables](#css-variables) ### [`className`](#classname) Returns a read-only CSS `className` for the loaded font to be passed to an HTML element. <p className={inter.className}>Hello, Next.js!</p> ### [`style`](#style-1) Returns a read-only CSS `style` object for the loaded font to be passed to an HTML element, including `style.fontFamily` to access the font family name and fallback fonts. <p style={inter.style}>Hello World</p> ### [CSS Variables](#css-variables) If you would like to set your styles in an external style sheet and specify additional options there, use the CSS variable method. In addition to importing the font, also import the CSS file where the CSS variable is defined and set the variable option of the font loader object as follows: app/page.tsx TypeScript JavaScriptTypeScript import { Inter } from 'next/font/google' import styles from '../styles/component.module.css' const inter = Inter({ variable: '--font-inter', }) To use the font, set the `className` of the parent container of the text you would like to style to the font loader's `variable` value and the `className` of the text to the `styles` property from the external CSS file. app/page.tsx TypeScript JavaScriptTypeScript <main className={inter.variable}> <p className={styles.text}>Hello World</p> </main> Define the `text` selector class in the `component.module.css` CSS file as follows: styles/component.module.css .text { font-family: var(--font-inter); font-weight: 200; font-style: italic; } In the example above, the text `Hello World` is styled using the `Inter` font and the generated font fallback with `font-weight: 200` and `font-style: italic`. [Using a font definitions file](#using-a-font-definitions-file) --------------------------------------------------------------- Every time you call the `localFont` or Google font function, that font will be hosted as one instance in your application. Therefore, if you need to use the same font in multiple places, you should load it in one place and import the related font object where you need it. This is done using a font definitions file. For example, create a `fonts.ts` file in a `styles` folder at the root of your app directory. Then, specify your font definitions as follows: styles/fonts.ts TypeScript JavaScriptTypeScript import { Inter, Lora, Source_Sans_3 } from 'next/font/google' import localFont from 'next/font/local' // define your variable fonts const inter = Inter() const lora = Lora() // define 2 weights of a non-variable font const sourceCodePro400 = Source_Sans_3({ weight: '400' }) const sourceCodePro700 = Source_Sans_3({ weight: '700' }) // define a custom local font where GreatVibes-Regular.ttf is stored in the styles folder const greatVibes = localFont({ src: './GreatVibes-Regular.ttf' }) export { inter, lora, sourceCodePro400, sourceCodePro700, greatVibes } You can now use these definitions in your code as follows: app/page.tsx TypeScript JavaScriptTypeScript import { inter, lora, sourceCodePro700, greatVibes } from '../styles/fonts' export default function Page() { return ( <div> <p className={inter.className}>Hello world using Inter font</p> <p style={lora.style}>Hello world using Lora font</p> <p className={sourceCodePro700.className}> Hello world using Source_Sans_3 font with weight 700 </p> <p className={greatVibes.className}>My title in Great Vibes font</p> </div> ) } To make it easier to access the font definitions in your code, you can define a path alias in your `tsconfig.json` or `jsconfig.json` files as follows: tsconfig.json { "compilerOptions": { "paths": { "@/fonts": ["./styles/fonts"] } } } You can now import any font definition as follows: app/about/page.tsx TypeScript JavaScriptTypeScript import { greatVibes, sourceCodePro400 } from '@/fonts' [Version Changes](#version-changes) ----------------------------------- Version Changes `v13.2.0` `@next/font` renamed to `next/font`. Installation no longer required. `v13.0.0` `@next/font` was added. [Previous Components ](/docs/app/api-reference/components) [Next <Image> ](/docs/app/api-reference/components/image) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [How error.js Works](#how-errorjs-works) * [Recovering From Errors](#recovering-from-errors) * [Nested Routes](#nested-routes) * [Handling Errors in Layouts](#handling-errors-in-layouts) * [Handling Errors in Root Layouts](#handling-errors-in-root-layouts) * [Handling Server Errors](#handling-server-errors) * [Securing Sensitive Error Information](#securing-sensitive-error-information) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/05-error-handling.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Error Handling Error Handling ============== The `error.js` file convention allows you to gracefully handle unexpected runtime errors in [nested routes](/docs/app/building-your-application/routing#nested-routes). * Automatically wrap a route segment and its nested children in a [React Error Boundary](https://react.dev/reference/react/Component#catching-rendering-errors-with-an-error-boundary). * Create error UI tailored to specific segments using the file-system hierarchy to adjust granularity. * Isolate errors to affected segments while keeping the rest of the application functional. * Add functionality to attempt to recover from an error without a full page reload. Create error UI by adding an `error.js` file inside a route segment and exporting a React component:  app/dashboard/error.tsx TypeScript JavaScriptTypeScript 'use client' // Error components must be Client Components import { useEffect } from 'react' export default function Error({ error, reset, }: { error: Error & { digest?: string } reset: () => void }) { useEffect(() => { // Log the error to an error reporting service console.error(error) }, [error]) return ( <div> <h2>Something went wrong!</h2> <button onClick={ // Attempt to recover by trying to re-render the segment () => reset() } > Try again </button> </div> ) } ### [How `error.js` Works](#how-errorjs-works)  * `error.js` automatically creates a [React Error Boundary](https://react.dev/reference/react/Component#catching-rendering-errors-with-an-error-boundary) that **wraps** a nested child segment or `page.js` component. * The React component exported from the `error.js` file is used as the **fallback** component. * If an error is thrown within the error boundary, the error is **contained**, and the fallback component is **rendered**. * When the fallback error component is active, layouts **above** the error boundary **maintain** their state and **remain** interactive, and the error component can display functionality to recover from the error. ### [Recovering From Errors](#recovering-from-errors) The cause of an error can sometimes be temporary. In these cases, simply trying again might resolve the issue. An error component can use the `reset()` function to prompt the user to attempt to recover from the error. When executed, the function will try to re-render the Error boundary's contents. If successful, the fallback error component is replaced with the result of the re-render. app/dashboard/error.tsx TypeScript JavaScriptTypeScript 'use client' export default function Error({ error, reset, }: { error: Error & { digest?: string } reset: () => void }) { return ( <div> <h2>Something went wrong!</h2> <button onClick={() => reset()}>Try again</button> </div> ) } ### [Nested Routes](#nested-routes) React components created through [special files](/docs/app/building-your-application/routing#file-conventions) are rendered in a [specific nested hierarchy](/docs/app/building-your-application/routing#component-hierarchy). For example, a nested route with two segments that both include `layout.js` and `error.js` files are rendered in the following _simplified_ component hierarchy:  The nested component hierarchy has implications for the behavior of `error.js` files across a nested route: * Errors bubble up to the nearest parent error boundary. This means an `error.js` file will handle errors for all its nested child segments. More or less granular error UI can be achieved by placing `error.js` files at different levels in the nested folders of a route. * An `error.js` boundary will **not** handle errors thrown in a `layout.js` component in the **same** segment because the error boundary is nested **inside** that layout's component. ### [Handling Errors in Layouts](#handling-errors-in-layouts) `error.js` boundaries do **not** catch errors thrown in `layout.js` or `template.js` components of the **same segment**. This [intentional hierarchy](#nested-routes) keeps important UI that is shared between sibling routes (such as navigation) visible and functional when an error occurs. To handle errors within a specific layout or template, place an `error.js` file in the layout's parent segment. To handle errors within the root layout or template, use a variation of `error.js` called `global-error.js`. ### [Handling Errors in Root Layouts](#handling-errors-in-root-layouts) The root `app/error.js` boundary does **not** catch errors thrown in the root `app/layout.js` or `app/template.js` component. To specifically handle errors in these root components, use a variation of `error.js` called `app/global-error.js` located in the root `app` directory. Unlike the root `error.js`, the `global-error.js` error boundary wraps the **entire** application, and its fallback component replaces the root layout when active. Because of this, it is important to note that `global-error.js` **must** define its own `<html>` and `<body>` tags. `global-error.js` is the least granular error UI and can be considered "catch-all" error handling for the whole application. It is unlikely to be triggered often as root components are typically less dynamic, and other `error.js` boundaries will catch most errors. Even if a `global-error.js` is defined, it is still recommended to define a root `error.js` whose fallback component will be rendered **within** the root layout, which includes globally shared UI and branding. app/global-error.tsx TypeScript JavaScriptTypeScript 'use client' export default function GlobalError({ error, reset, }: { error: Error & { digest?: string } reset: () => void }) { return ( <html> <body> <h2>Something went wrong!</h2> <button onClick={() => reset()}>Try again</button> </body> </html> ) } > **Good to know**: > > * `global-error.js` is only enabled in production. In development, our error overlay will show instead. ### [Handling Server Errors](#handling-server-errors) If an error is thrown inside a Server Component, Next.js will forward an `Error` object (stripped of sensitive error information in production) to the nearest `error.js` file as the `error` prop. #### [Securing Sensitive Error Information](#securing-sensitive-error-information) During production, the `Error` object forwarded to the client only includes a generic `message` and `digest` property. This is a security precaution to avoid leaking potentially sensitive details included in the error to the client. The `message` property contains a generic message about the error and the `digest` property contains an automatically generated hash of the error that can be used to match the corresponding error in server-side logs. During development, the `Error` object forwarded to the client will be serialized and include the `message` of the original error for easier debugging. Next Steps ---------- [ App Router ... File Conventions ### error.js API reference for the error.js special file. ](/docs/app/api-reference/file-conventions/error) [Previous Loading UI and Streaming ](/docs/app/building-your-application/routing/loading-ui-and-streaming) [Next Redirecting ](/docs/app/building-your-application/routing/redirecting) Was this helpful? supported. Send

https://nextjs.org/docs/app/building-your-application/configuring/typescript

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[eslint](/docs/app/api-reference/next-config-js/eslint) * [exportPathMap](/docs/app/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/app/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/app/api-reference/next-config-js/generateEtags) * [headers](/docs/app/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/app/api-reference/next-config-js/httpAgentOptions) * [images](/docs/app/api-reference/next-config-js/images) * [cacheHandler](/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath) * [instrumentationHook](/docs/app/api-reference/next-config-js/instrumentationHook) * [logging](/docs/app/api-reference/next-config-js/logging) * [mdxRs](/docs/app/api-reference/next-config-js/mdxRs) * [onDemandEntries](/docs/app/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/app/api-reference/next-config-js/optimizePackageImports) * [output](/docs/app/api-reference/next-config-js/output) * [pageExtensions](/docs/app/api-reference/next-config-js/pageExtensions) * [Partial Prerendering (experimental)](/docs/app/api-reference/next-config-js/partial-prerendering) * [poweredByHeader](/docs/app/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/app/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/app/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/app/api-reference/next-config-js/redirects) * [rewrites](/docs/app/api-reference/next-config-js/rewrites) * [serverActions](/docs/app/api-reference/next-config-js/serverActions) * [serverComponentsExternalPackages](/docs/app/api-reference/next-config-js/serverComponentsExternalPackages) * [StaleTimes (experimental)](/docs/app/api-reference/next-config-js/staleTimes) * [trailingSlash](/docs/app/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/app/api-reference/next-config-js/transpilePackages) * [turbo](/docs/app/api-reference/next-config-js/turbo) * [typedRoutes](/docs/app/api-reference/next-config-js/typedRoutes) * [typescript](/docs/app/api-reference/next-config-js/typescript) * [urlImports](/docs/app/api-reference/next-config-js/urlImports) * [webpack](/docs/app/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/app/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/app/api-reference/create-next-app) * [Edge Runtime](/docs/app/api-reference/edge) * [Next.js CLI](/docs/app/api-reference/next-cli) * [Building Your Application](/docs/pages/building-your-application) * [Routing](/docs/pages/building-your-application/routing) * [Pages and Layouts](/docs/pages/building-your-application/routing/pages-and-layouts) * [Dynamic Routes](/docs/pages/building-your-application/routing/dynamic-routes) * [Linking and Navigating](/docs/pages/building-your-application/routing/linking-and-navigating) * [Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering 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Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 10](/docs/pages/building-your-application/upgrading/version-10) * [Version 9](/docs/pages/building-your-application/upgrading/version-9) * [API Reference](/docs/pages/api-reference) * [Components](/docs/pages/api-reference/components) * [Font](/docs/pages/api-reference/components/font) * [<Head>](/docs/pages/api-reference/components/head) * [<Image>](/docs/pages/api-reference/components/image) * [<Image> (Legacy)](/docs/pages/api-reference/components/image-legacy) * [<Link>](/docs/pages/api-reference/components/link) * [<Script>](/docs/pages/api-reference/components/script) * [Functions](/docs/pages/api-reference/functions) * [getInitialProps](/docs/pages/api-reference/functions/get-initial-props) * [getServerSideProps](/docs/pages/api-reference/functions/get-server-side-props) * [getStaticPaths](/docs/pages/api-reference/functions/get-static-paths) * [getStaticProps](/docs/pages/api-reference/functions/get-static-props) * [NextRequest](/docs/pages/api-reference/functions/next-request) * [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [New Projects](#new-projects) * [Existing Projects](#existing-projects) * [TypeScript Plugin](#typescript-plugin) * [Plugin Features](#plugin-features) * [Minimum TypeScript Version](#minimum-typescript-version) * [Statically Typed Links](#statically-typed-links) * [End-to-End Type Safety](#end-to-end-type-safety) * [Async Server Component TypeScript Error](#async-server-component-typescript-error) * [Passing Data Between Server & Client Components](#passing-data-between-server--client-components) * [Path aliases and baseUrl](#path-aliases-and-baseurl) * [Type checking next.config.js](#type-checking-nextconfigjs) * [Incremental type checking](#incremental-type-checking) * [Ignoring TypeScript Errors](#ignoring-typescript-errors) * [Custom Type Declarations](#custom-type-declarations) * [Version Changes](#version-changes) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/07-configuring/01-typescript.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Configuring](/docs/app/building-your-application/configuring)TypeScript TypeScript ========== Next.js provides a TypeScript-first development experience for building your React application. It comes with built-in TypeScript support for automatically installing the necessary packages and configuring the proper settings. As well as a [TypeScript Plugin](#typescript-plugin) for your editor. > **🎥 Watch:** Learn about the built-in TypeScript plugin → [YouTube (3 minutes)](https://www.youtube.com/watch?v=pqMqn9fKEf8) [New Projects](#new-projects) ----------------------------- `create-next-app` now ships with TypeScript by default. Terminal npx create-next-app@latest [Existing Projects](#existing-projects) --------------------------------------- Add TypeScript to your project by renaming a file to `.ts` / `.tsx`. Run `next dev` and `next build` to automatically install the necessary dependencies and add a `tsconfig.json` file with the recommended config options. If you already had a `jsconfig.json` file, copy the `paths` compiler option from the old `jsconfig.json` into the new `tsconfig.json` file, and delete the old `jsconfig.json` file. [TypeScript Plugin](#typescript-plugin) --------------------------------------- Next.js includes a custom TypeScript plugin and type checker, which VSCode and other code editors can use for advanced type-checking and auto-completion. You can enable the plugin in VS Code by: 1. Opening the command palette (`Ctrl/⌘` + `Shift` + `P`) 2. Searching for "TypeScript: Select TypeScript Version" 3. Selecting "Use Workspace Version"  Now, when editing files, the custom plugin will be enabled. When running `next build`, the custom type checker will be used. ### [Plugin Features](#plugin-features) The TypeScript plugin can help with: * Warning if the invalid values for [segment config options](/docs/app/api-reference/file-conventions/route-segment-config) are passed. * Showing available options and in-context documentation. * Ensuring the `use client` directive is used correctly. * Ensuring client hooks (like `useState`) are only used in Client Components. > **Good to know**: More features will be added in the future. [Minimum TypeScript Version](#minimum-typescript-version) --------------------------------------------------------- It is highly recommended to be on at least `v4.5.2` of TypeScript to get syntax features such as [type modifiers on import names](https://devblogs.microsoft.com/typescript/announcing-typescript-4-5/#type-on-import-names) and [performance improvements](https://devblogs.microsoft.com/typescript/announcing-typescript-4-5/#real-path-sync-native). [Statically Typed Links](#statically-typed-links) ------------------------------------------------- Next.js can statically type links to prevent typos and other errors when using `next/link`, improving type safety when navigating between pages. To opt-into this feature, `experimental.typedRoutes` need to be enabled and the project needs to be using TypeScript. next.config.js /** @type {import('next').NextConfig} */ const nextConfig = { experimental: { typedRoutes: true, }, } module.exports = nextConfig Next.js will generate a link definition in `.next/types` that contains information about all existing routes in your application, which TypeScript can then use to provide feedback in your editor about invalid links. Currently, experimental support includes any string literal, including dynamic segments. For non-literal strings, you currently need to manually cast the `href` with `as Route`: import type { Route } from 'next'; import Link from 'next/link' // No TypeScript errors if href is a valid route <Link href="/about" /> <Link href="/blog/nextjs" /> <Link href={`/blog/${slug}`} /> <Link href={('/blog' + slug) as Route} /> // TypeScript errors if href is not a valid route <Link href="/aboot" /> To accept `href` in a custom component wrapping `next/link`, use a generic: import type { Route } from 'next' import Link from 'next/link' function Card<T extends string>({ href }: { href: Route<T> | URL }) { return ( <Link href={href}> <div>My Card</div> </Link> ) } > **How does it work?** > > When running `next dev` or `next build`, Next.js generates a hidden `.d.ts` file inside `.next` that contains information about all existing routes in your application (all valid routes as the `href` type of `Link`). This `.d.ts` file is included in `tsconfig.json` and the TypeScript compiler will check that `.d.ts` and provide feedback in your editor about invalid links. [End-to-End Type Safety](#end-to-end-type-safety) ------------------------------------------------- The Next.js App Router has **enhanced type safety**. This includes: 1. **No serialization of data between fetching function and page**: You can `fetch` directly in components, layouts, and pages on the server. This data _does not_ need to be serialized (converted to a string) to be passed to the client side for consumption in React. Instead, since `app` uses Server Components by default, we can use values like `Date`, `Map`, `Set`, and more without any extra steps. Previously, you needed to manually type the boundary between server and client with Next.js-specific types. 2. **Streamlined data flow between components**: With the removal of `_app` in favor of root layouts, it is now easier to visualize the data flow between components and pages. Previously, data flowing between individual `pages` and `_app` were difficult to type and could introduce confusing bugs. With [colocated data fetching](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) in the App Router, this is no longer an issue. [Data Fetching in Next.js](/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating) now provides as close to end-to-end type safety as possible without being prescriptive about your database or content provider selection. We're able to type the response data as you would expect with normal TypeScript. For example: app/page.tsx async function getData() { const res = await fetch('https://api.example.com/...') // The return value is *not* serialized // You can return Date, Map, Set, etc. return res.json() } export default async function Page() { const name = await getData() return '...' } For _complete_ end-to-end type safety, this also requires your database or content provider to support TypeScript. This could be through using an [ORM](https://en.wikipedia.org/wiki/Object%E2%80%93relational_mapping) or type-safe query builder. [Async Server Component TypeScript Error](#async-server-component-typescript-error) ----------------------------------------------------------------------------------- To use an `async` Server Component with TypeScript, ensure you are using TypeScript `5.1.3` or higher and `@types/react` `18.2.8` or higher. If you are using an older version of TypeScript, you may see a `'Promise<Element>' is not a valid JSX element` type error. Updating to the latest version of TypeScript and `@types/react` should resolve this issue. [Passing Data Between Server & Client Components](#passing-data-between-server--client-components) -------------------------------------------------------------------------------------------------- When passing data between a Server and Client Component through props, the data is still serialized (converted to a string) for use in the browser. However, it does not need a special type. It’s typed the same as passing any other props between components. Further, there is less code to be serialized, as un-rendered data does not cross between the server and client (it remains on the server). This is only now possible through support for Server Components. [Path aliases and baseUrl](#path-aliases-and-baseurl) ----------------------------------------------------- Next.js automatically supports the `tsconfig.json` `"paths"` and `"baseUrl"` options. You can learn more about this feature on the [Module Path aliases documentation](/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases). [Type checking next.config.js](#type-checking-nextconfigjs) ----------------------------------------------------------- The `next.config.js` file must be a JavaScript file as it does not get parsed by Babel or TypeScript, however you can add some type checking in your IDE using JSDoc as below: // @ts-check /** * @type {import('next').NextConfig} **/ const nextConfig = { /* config options here */ } module.exports = nextConfig [Incremental type checking](#incremental-type-checking) ------------------------------------------------------- Since `v10.2.1` Next.js supports [incremental type checking](https://www.typescriptlang.org/tsconfig#incremental) when enabled in your `tsconfig.json`, this can help speed up type checking in larger applications. [Ignoring TypeScript Errors](#ignoring-typescript-errors) --------------------------------------------------------- Next.js fails your **production build** (`next build`) when TypeScript errors are present in your project. If you'd like Next.js to dangerously produce production code even when your application has errors, you can disable the built-in type checking step. If disabled, be sure you are running type checks as part of your build or deploy process, otherwise this can be very dangerous. Open `next.config.js` and enable the `ignoreBuildErrors` option in the `typescript` config: next.config.js module.exports = { typescript: { // !! WARN !! // Dangerously allow production builds to successfully complete even if // your project has type errors. // !! WARN !! ignoreBuildErrors: true, }, } [Custom Type Declarations](#custom-type-declarations) ----------------------------------------------------- When you need to declare custom types, you might be tempted to modify `next-env.d.ts`. However, this file is automatically generated, so any changes you make will be overwritten. Instead, you should create a new file, let's call it `new-types.d.ts`, and reference it in your `tsconfig.json`: tsconfig.json { "compilerOptions": { "skipLibCheck": true //...truncated... }, "include": [ "new-types.d.ts", "next-env.d.ts", ".next/types/**/*.ts", "**/*.ts", "**/*.tsx" ], "exclude": ["node_modules"] } [Version Changes](#version-changes) ----------------------------------- Version Changes `v13.2.0` Statically typed links are available in beta. `v12.0.0` [SWC](/docs/architecture/nextjs-compiler) is now used by default to compile TypeScript and TSX for faster builds. `v10.2.1` [Incremental type checking](https://www.typescriptlang.org/tsconfig#incremental) support added when enabled in your `tsconfig.json`. [Previous Configuring ](/docs/app/building-your-application/configuring) [Next ESLint ](/docs/app/building-your-application/configuring/eslint) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Props](#props) * [Required Props](#required-props) * [src](#src) * [width](#width) * [height](#height) * [alt](#alt) * [Optional Props](#optional-props) * [loader](#loader) * [fill](#fill) * [sizes](#sizes) * [quality](#quality) * [priority](#priority) * [placeholder](#placeholder) * [Advanced Props](#advanced-props) * [style](#style) * [onLoadingComplete](#onloadingcomplete) * [onLoad](#onload) * [onError](#onerror) * [loading](#loading) * [blurDataURL](#blurdataurl) * [unoptimized](#unoptimized) * [overrideSrc](#overridesrc) * [Other Props](#other-props) * [Configuration Options](#configuration-options) * [remotePatterns](#remotepatterns) * [domains](#domains) * [loaderFile](#loaderfile) * [Advanced](#advanced) * [deviceSizes](#devicesizes) * [imageSizes](#imagesizes) * [formats](#formats) * [Caching Behavior](#caching-behavior) * [minimumCacheTTL](#minimumcachettl) * [disableStaticImages](#disablestaticimages) * [dangerouslyAllowSVG](#dangerouslyallowsvg) * [Animated Images](#animated-images) * [Responsive Images](#responsive-images) * [Responsive image using a static import](#responsive-image-using-a-static-import) * [Responsive image with aspect ratio](#responsive-image-with-aspect-ratio) * [Responsive image with fill](#responsive-image-with-fill) * [Theme Detection CSS](#theme-detection-css) * [getImageProps](#getimageprops) * [Theme Detection Picture](#theme-detection-picture) * [Art Direction](#art-direction) * [Background CSS](#background-css) * [Known Browser Bugs](#known-browser-bugs) * [Version History](#version-history) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/01-components/image.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Components](/docs/app/api-reference/components)<Image> <Image> ======= Examples * [Image Component](https://github.com/vercel/next.js/tree/canary/examples/image-component) This API reference will help you understand how to use [props](#props) and [configuration options](#configuration-options) available for the Image Component. For features and usage, please see the [Image Component](/docs/app/building-your-application/optimizing/images) page. app/page.js import Image from 'next/image' export default function Page() { return ( <Image src="/profile.png" width={500} height={500} alt="Picture of the author" /> ) } [Props](#props) --------------- Here's a summary of the props available for the Image Component: Prop Example Type Status [`src`](#src) `src="/profile.png"` String Required [`width`](#width) `width={500}` Integer (px) Required [`height`](#height) `height={500}` Integer (px) Required [`alt`](#alt) `alt="Picture of the author"` String Required [`loader`](#loader) `loader={imageLoader}` Function \- [`fill`](#fill) `fill={true}` Boolean \- [`sizes`](#sizes) `sizes="(max-width: 768px) 100vw, 33vw"` String \- [`quality`](#quality) `quality={80}` Integer (1-100) \- [`priority`](#priority) `priority={true}` Boolean \- [`placeholder`](#placeholder) `placeholder="blur"` String \- [`style`](#style) `style={{objectFit: "contain"}}` Object \- [`onLoadingComplete`](#onloadingcomplete) `onLoadingComplete={img => done())}` Function Deprecated [`onLoad`](#onload) `onLoad={event => done())}` Function \- [`onError`](#onerror) `onError(event => fail()}` Function \- [`loading`](#loading) `loading="lazy"` String \- [`blurDataURL`](#blurdataurl) `blurDataURL="data:image/jpeg..."` String \- [`overrideSrc`](#overridesrc) `overrideSrc="/seo.png"` String \- [Required Props](#required-props) --------------------------------- The Image Component requires the following properties: `src`, `width`, `height`, and `alt`. app/page.js import Image from 'next/image' export default function Page() { return ( <div> <Image src="/profile.png" width={500} height={500} alt="Picture of the author" /> </div> ) } ### [`src`](#src) Must be one of the following: * A [statically imported](/docs/app/building-your-application/optimizing/images#local-images) image file * A path string. This can be either an absolute external URL, or an internal path depending on the [loader](#loader) prop. When using an external URL, you must add it to [remotePatterns](#remotepatterns) in `next.config.js`. ### [`width`](#width) The `width` property represents the _rendered_ width in pixels, so it will affect how large the image appears. Required, except for [statically imported images](/docs/app/building-your-application/optimizing/images#local-images) or images with the [`fill` property](#fill). ### [`height`](#height) The `height` property represents the _rendered_ height in pixels, so it will affect how large the image appears. Required, except for [statically imported images](/docs/app/building-your-application/optimizing/images#local-images) or images with the [`fill` property](#fill). ### [`alt`](#alt) The `alt` property is used to describe the image for screen readers and search engines. It is also the fallback text if images have been disabled or an error occurs while loading the image. It should contain text that could replace the image [without changing the meaning of the page](https://html.spec.whatwg.org/multipage/images.html#general-guidelines). It is not meant to supplement the image and should not repeat information that is already provided in the captions above or below the image. If the image is [purely decorative](https://html.spec.whatwg.org/multipage/images.html#a-purely-decorative-image-that-doesn't-add-any-information) or [not intended for the user](https://html.spec.whatwg.org/multipage/images.html#an-image-not-intended-for-the-user), the `alt` property should be an empty string (`alt=""`). [Learn more](https://html.spec.whatwg.org/multipage/images.html#alt) [Optional Props](#optional-props) --------------------------------- The `<Image />` component accepts a number of additional properties beyond those which are required. This section describes the most commonly-used properties of the Image component. Find details about more rarely-used properties in the [Advanced Props](#advanced-props) section. ### [`loader`](#loader) A custom function used to resolve image URLs. A `loader` is a function returning a URL string for the image, given the following parameters: * [`src`](#src) * [`width`](#width) * [`quality`](#quality) Here is an example of using a custom loader: 'use client' import Image from 'next/image' const imageLoader = ({ src, width, quality }) => { return `https://example.com/${src}?w=${width}&q=${quality || 75}` } export default function Page() { return ( <Image loader={imageLoader} src="me.png" alt="Picture of the author" width={500} height={500} /> ) } > **Good to know**: Using props like `loader`, which accept a function, requires using [Client Components](/docs/app/building-your-application/rendering/client-components) to serialize the provided function. Alternatively, you can use the [loaderFile](#loaderfile) configuration in `next.config.js` to configure every instance of `next/image` in your application, without passing a prop. ### [`fill`](#fill) fill={true} // {true} | {false} A boolean that causes the image to fill the parent element, which is useful when the [`width`](#width) and [`height`](#height) are unknown. The parent element _must_ assign `position: "relative"`, `position: "fixed"`, or `position: "absolute"` style. By default, the img element will automatically be assigned the `position: "absolute"` style. If no styles are applied to the image, the image will stretch to fit the container. You may prefer to set `object-fit: "contain"` for an image which is letterboxed to fit the container and preserve aspect ratio. Alternatively, `object-fit: "cover"` will cause the image to fill the entire container and be cropped to preserve aspect ratio. For this to look correct, the `overflow: "hidden"` style should be assigned to the parent element. For more information, see also: * [`position`](https://developer.mozilla.org/docs/Web/CSS/position) * [`object-fit`](https://developer.mozilla.org/docs/Web/CSS/object-fit) * [`object-position`](https://developer.mozilla.org/docs/Web/CSS/object-position) ### [`sizes`](#sizes) A string, similar to a media query, that provides information about how wide the image will be at different breakpoints. The value of `sizes` will greatly affect performance for images using [`fill`](#fill) or which are [styled to have a responsive size](#responsive-images). The `sizes` property serves two important purposes related to image performance: * First, the value of `sizes` is used by the browser to determine which size of the image to download, from `next/image`'s automatically generated `srcset`. When the browser chooses, it does not yet know the size of the image on the page, so it selects an image that is the same size or larger than the viewport. The `sizes` property allows you to tell the browser that the image will actually be smaller than full screen. If you don't specify a `sizes` value in an image with the `fill` property, a default value of `100vw` (full screen width) is used. * Second, the `sizes` property changes the behavior of the automatically generated `srcset` value. If no `sizes` value is present, a small `srcset` is generated, suitable for a fixed-size image (1x/2x/etc). If `sizes` is defined, a large `srcset` is generated, suitable for a responsive image (640w/750w/etc). If the `sizes` property includes sizes such as `50vw`, which represent a percentage of the viewport width, then the `srcset` is trimmed to not include any values which are too small to ever be necessary. For example, if you know your styling will cause an image to be full-width on mobile devices, in a 2-column layout on tablets, and a 3-column layout on desktop displays, you should include a sizes property such as the following: import Image from 'next/image' export default function Page() { return ( <div className="grid-element"> <Image fill src="/example.png" sizes="(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw" /> </div> ) } This example `sizes` could have a dramatic effect on performance metrics. Without the `33vw` sizes, the image selected from the server would be 3 times as wide as it needs to be. Because file size is proportional to the square of the width, without `sizes` the user would download an image that's 9 times larger than necessary. Learn more about `srcset` and `sizes`: * [web.dev](https://web.dev/learn/design/responsive-images/#sizes) * [mdn](https://developer.mozilla.org/docs/Web/HTML/Element/img#sizes) ### [`quality`](#quality) quality={75} // {number 1-100} The quality of the optimized image, an integer between `1` and `100`, where `100` is the best quality and therefore largest file size. Defaults to `75`. ### [`priority`](#priority) priority={false} // {false} | {true} When true, the image will be considered high priority and [preload](https://web.dev/preload-responsive-images/). Lazy loading is automatically disabled for images using `priority`. You should use the `priority` property on any image detected as the [Largest Contentful Paint (LCP)](https://nextjs.org/learn/seo/web-performance/lcp) element. It may be appropriate to have multiple priority images, as different images may be the LCP element for different viewport sizes. Should only be used when the image is visible above the fold. Defaults to `false`. ### [`placeholder`](#placeholder) placeholder = 'empty' // "empty" | "blur" | "data:image/..." A placeholder to use while the image is loading. Possible values are `blur`, `empty`, or `data:image/...`. Defaults to `empty`. When `blur`, the [`blurDataURL`](#blurdataurl) property will be used as the placeholder. If `src` is an object from a [static import](/docs/app/building-your-application/optimizing/images#local-images) and the imported image is `.jpg`, `.png`, `.webp`, or `.avif`, then `blurDataURL` will be automatically populated, except when the image is detected to be animated. For dynamic images, you must provide the [`blurDataURL`](#blurdataurl) property. Solutions such as [Plaiceholder](https://github.com/joe-bell/plaiceholder) can help with `base64` generation. When `data:image/...`, the [Data URL](https://developer.mozilla.org/docs/Web/HTTP/Basics_of_HTTP/Data_URIs) will be used as the placeholder while the image is loading. When `empty`, there will be no placeholder while the image is loading, only empty space. Try it out: * [Demo the `blur` placeholder](https://image-component.nextjs.gallery/placeholder) * [Demo the shimmer effect with data URL `placeholder` prop](https://image-component.nextjs.gallery/shimmer) * [Demo the color effect with `blurDataURL` prop](https://image-component.nextjs.gallery/color) [Advanced Props](#advanced-props) --------------------------------- In some cases, you may need more advanced usage. The `<Image />` component optionally accepts the following advanced properties. ### [`style`](#style) Allows passing CSS styles to the underlying image element. components/ProfileImage.js const imageStyle = { borderRadius: '50%', border: '1px solid #fff', } export default function ProfileImage() { return <Image src="..." style={imageStyle} /> } Remember that the required width and height props can interact with your styling. If you use styling to modify an image's width, you should also style its height to `auto` to preserve its intrinsic aspect ratio, or your image will be distorted. ### [`onLoadingComplete`](#onloadingcomplete) 'use client' <Image onLoadingComplete={(img) => console.log(img.naturalWidth)} /> > **Warning**: Deprecated since Next.js 14 in favor of [`onLoad`](#onload). A callback function that is invoked once the image is completely loaded and the [placeholder](#placeholder) has been removed. The callback function will be called with one argument, a reference to the underlying `<img>` element. > **Good to know**: Using props like `onLoadingComplete`, which accept a function, requires using [Client Components](/docs/app/building-your-application/rendering/client-components) to serialize the provided function. ### [`onLoad`](#onload) <Image onLoad={(e) => console.log(e.target.naturalWidth)} /> A callback function that is invoked once the image is completely loaded and the [placeholder](#placeholder) has been removed. The callback function will be called with one argument, the Event which has a `target` that references the underlying `<img>` element. > **Good to know**: Using props like `onLoad`, which accept a function, requires using [Client Components](/docs/app/building-your-application/rendering/client-components) to serialize the provided function. ### [`onError`](#onerror) <Image onError={(e) => console.error(e.target.id)} /> A callback function that is invoked if the image fails to load. > **Good to know**: Using props like `onError`, which accept a function, requires using [Client Components](/docs/app/building-your-application/rendering/client-components) to serialize the provided function. ### [`loading`](#loading) > **Recommendation**: This property is only meant for advanced use cases. Switching an image to load with `eager` will normally **hurt performance**. We recommend using the [`priority`](#priority) property instead, which will eagerly preload the image. loading = 'lazy' // {lazy} | {eager} The loading behavior of the image. Defaults to `lazy`. When `lazy`, defer loading the image until it reaches a calculated distance from the viewport. When `eager`, load the image immediately. Learn more about the [`loading` attribute](https://developer.mozilla.org/docs/Web/HTML/Element/img#loading). ### [`blurDataURL`](#blurdataurl) A [Data URL](https://developer.mozilla.org/docs/Web/HTTP/Basics_of_HTTP/Data_URIs) to be used as a placeholder image before the `src` image successfully loads. Only takes effect when combined with [`placeholder="blur"`](#placeholder). Must be a base64-encoded image. It will be enlarged and blurred, so a very small image (10px or less) is recommended. Including larger images as placeholders may harm your application performance. Try it out: * [Demo the default `blurDataURL` prop](https://image-component.nextjs.gallery/placeholder) * [Demo the color effect with `blurDataURL` prop](https://image-component.nextjs.gallery/color) You can also [generate a solid color Data URL](https://png-pixel.com) to match the image. ### [`unoptimized`](#unoptimized) unoptimized = {false} // {false} | {true} When true, the source image will be served as-is instead of changing quality, size, or format. Defaults to `false`. import Image from 'next/image' const UnoptimizedImage = (props) => { return <Image {...props} unoptimized /> } Since Next.js 12.3.0, this prop can be assigned to all images by updating `next.config.js` with the following configuration: next.config.js module.exports = { images: { unoptimized: true, }, } ### [`overrideSrc`](#overridesrc) When providing the `src` prop to the `<Image>` component, both the `srcset` and `src` attributes are generated automatically for the resulting `<img>`. input.js <Image src="/me.jpg" /> output.html <img srcset=" /_next/image?url=%2Fme.jpg&w=640&q=75 1x, /_next/image?url=%2Fme.jpg&w=828&q=75 2x " src="/_next/image?url=%2Fme.jpg&w=828&q=75" /> In some cases, it is not desirable to have the `src` attribute generated and you may wish to override it using the `overrideSrc` prop. For example, when upgrading an existing website from `<img>` to `<Image>`, you may wish to maintain the same `src` attribute for SEO purposes such as image ranking or avoiding recrawl. input.js <Image src="/me.jpg" overrideSrc="/override.jpg" /> output.html <img srcset=" /_next/image?url=%2Fme.jpg&w=640&q=75 1x, /_next/image?url=%2Fme.jpg&w=828&q=75 2x " src="/override.jpg" /> ### [Other Props](#other-props) Other properties on the `<Image />` component will be passed to the underlying `img` element with the exception of the following: * `srcSet`. Use [Device Sizes](#devicesizes) instead. * `decoding`. It is always `"async"`. [Configuration Options](#configuration-options) ----------------------------------------------- In addition to props, you can configure the Image Component in `next.config.js`. The following options are available: ### [`remotePatterns`](#remotepatterns) To protect your application from malicious users, configuration is required in order to use external images. This ensures that only external images from your account can be served from the Next.js Image Optimization API. These external images can be configured with the `remotePatterns` property in your `next.config.js` file, as shown below: next.config.js module.exports = { images: { remotePatterns: [ { protocol: 'https', hostname: 'example.com', port: '', pathname: '/account123/**', }, ], }, } > **Good to know**: The example above will ensure the `src` property of `next/image` must start with `https://example.com/account123/`. Any other protocol, hostname, port, or unmatched path will respond with 400 Bad Request. Below is another example of the `remotePatterns` property in the `next.config.js` file: next.config.js module.exports = { images: { remotePatterns: [ { protocol: 'https', hostname: '**.example.com', port: '', }, ], }, } > **Good to know**: The example above will ensure the `src` property of `next/image` must start with `https://img1.example.com` or `https://me.avatar.example.com` or any number of subdomains. Any other protocol, port, or unmatched hostname will respond with 400 Bad Request. Wildcard patterns can be used for both `pathname` and `hostname` and have the following syntax: * `*` match a single path segment or subdomain * `**` match any number of path segments at the end or subdomains at the beginning The `**` syntax does not work in the middle of the pattern. > **Good to know**: When omitting `protocol`, `port` or `pathname`, then the wildcard `**` is implied. This is not recommended because it may allow malicious actors to optimize urls you did not intend. ### [`domains`](#domains) > **Warning**: Deprecated since Next.js 14 in favor of strict [`remotePatterns`](#remotepatterns) in order to protect your application from malicious users. Only use `domains` if you own all the content served from the domain. Similar to [`remotePatterns`](#remotepatterns), the `domains` configuration can be used to provide a list of allowed hostnames for external images. However, the `domains` configuration does not support wildcard pattern matching and it cannot restrict protocol, port, or pathname. Below is an example of the `domains` property in the `next.config.js` file: next.config.js module.exports = { images: { domains: ['assets.acme.com'], }, } ### [`loaderFile`](#loaderfile) If you want to use a cloud provider to optimize images instead of using the Next.js built-in Image Optimization API, you can configure the `loaderFile` in your `next.config.js` like the following: next.config.js module.exports = { images: { loader: 'custom', loaderFile: './my/image/loader.js', }, } This must point to a file relative to the root of your Next.js application. The file must export a default function that returns a string, for example: my/image/loader.js 'use client' export default function myImageLoader({ src, width, quality }) { return `https://example.com/${src}?w=${width}&q=${quality || 75}` } Alternatively, you can use the [`loader` prop](#loader) to configure each instance of `next/image`. Examples: * [Custom Image Loader Configuration](/docs/app/api-reference/next-config-js/images#example-loader-configuration) > **Good to know**: Customizing the image loader file, which accepts a function, requires using [Client Components](/docs/app/building-your-application/rendering/client-components) to serialize the provided function. [Advanced](#advanced) --------------------- The following configuration is for advanced use cases and is usually not necessary. If you choose to configure the properties below, you will override any changes to the Next.js defaults in future updates. ### [`deviceSizes`](#devicesizes) If you know the expected device widths of your users, you can specify a list of device width breakpoints using the `deviceSizes` property in `next.config.js`. These widths are used when the `next/image` component uses [`sizes`](#sizes) prop to ensure the correct image is served for user's device. If no configuration is provided, the default below is used. next.config.js module.exports = { images: { deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840], }, } ### [`imageSizes`](#imagesizes) You can specify a list of image widths using the `images.imageSizes` property in your `next.config.js` file. These widths are concatenated with the array of [device sizes](#devicesizes) to form the full array of sizes used to generate image [srcset](https://developer.mozilla.org/docs/Web/API/HTMLImageElement/srcset)s. The reason there are two separate lists is that imageSizes is only used for images which provide a [`sizes`](#sizes) prop, which indicates that the image is less than the full width of the screen. **Therefore, the sizes in imageSizes should all be smaller than the smallest size in deviceSizes.** If no configuration is provided, the default below is used. next.config.js module.exports = { images: { imageSizes: [16, 32, 48, 64, 96, 128, 256, 384], }, } ### [`formats`](#formats) The default [Image Optimization API](#loader) will automatically detect the browser's supported image formats via the request's `Accept` header. If the `Accept` head matches more than one of the configured formats, the first match in the array is used. Therefore, the array order matters. If there is no match (or the source image is [animated](#animated-images)), the Image Optimization API will fallback to the original image's format. If no configuration is provided, the default below is used. next.config.js module.exports = { images: { formats: ['image/webp'], }, } You can enable AVIF support with the following configuration. next.config.js module.exports = { images: { formats: ['image/avif', 'image/webp'], }, } > **Good to know**: > > * AVIF generally takes 20% longer to encode but it compresses 20% smaller compared to WebP. This means that the first time an image is requested, it will typically be slower and then subsequent requests that are cached will be faster. > * If you self-host with a Proxy/CDN in front of Next.js, you must configure the Proxy to forward the `Accept` header. [Caching Behavior](#caching-behavior) ------------------------------------- The following describes the caching algorithm for the default [loader](#loader). For all other loaders, please refer to your cloud provider's documentation. Images are optimized dynamically upon request and stored in the `<distDir>/cache/images` directory. The optimized image file will be served for subsequent requests until the expiration is reached. When a request is made that matches a cached but expired file, the expired image is served stale immediately. Then the image is optimized again in the background (also called revalidation) and saved to the cache with the new expiration date. The cache status of an image can be determined by reading the value of the `x-nextjs-cache` response header. The possible values are the following: * `MISS` - the path is not in the cache (occurs at most once, on the first visit) * `STALE` - the path is in the cache but exceeded the revalidate time so it will be updated in the background * `HIT` - the path is in the cache and has not exceeded the revalidate time The expiration (or rather Max Age) is defined by either the [`minimumCacheTTL`](#minimumcachettl) configuration or the upstream image `Cache-Control` header, whichever is larger. Specifically, the `max-age` value of the `Cache-Control` header is used. If both `s-maxage` and `max-age` are found, then `s-maxage` is preferred. The `max-age` is also passed-through to any downstream clients including CDNs and browsers. * You can configure [`minimumCacheTTL`](#minimumcachettl) to increase the cache duration when the upstream image does not include `Cache-Control` header or the value is very low. * You can configure [`deviceSizes`](#devicesizes) and [`imageSizes`](#imagesizes) to reduce the total number of possible generated images. * You can configure [formats](#formats) to disable multiple formats in favor of a single image format. ### [`minimumCacheTTL`](#minimumcachettl) You can configure the Time to Live (TTL) in seconds for cached optimized images. In many cases, it's better to use a [Static Image Import](/docs/app/building-your-application/optimizing/images#local-images) which will automatically hash the file contents and cache the image forever with a `Cache-Control` header of `immutable`. next.config.js module.exports = { images: { minimumCacheTTL: 60, }, } The expiration (or rather Max Age) of the optimized image is defined by either the `minimumCacheTTL` or the upstream image `Cache-Control` header, whichever is larger. If you need to change the caching behavior per image, you can configure [`headers`](/docs/app/api-reference/next-config-js/headers) to set the `Cache-Control` header on the upstream image (e.g. `/some-asset.jpg`, not `/_next/image` itself). There is no mechanism to invalidate the cache at this time, so its best to keep `minimumCacheTTL` low. Otherwise you may need to manually change the [`src`](#src) prop or delete `<distDir>/cache/images`. ### [`disableStaticImages`](#disablestaticimages) The default behavior allows you to import static files such as `import icon from './icon.png'` and then pass that to the `src` property. In some cases, you may wish to disable this feature if it conflicts with other plugins that expect the import to behave differently. You can disable static image imports inside your `next.config.js`: next.config.js module.exports = { images: { disableStaticImages: true, }, } ### [`dangerouslyAllowSVG`](#dangerouslyallowsvg) The default [loader](#loader) does not optimize SVG images for a few reasons. First, SVG is a vector format meaning it can be resized losslessly. Second, SVG has many of the same features as HTML/CSS, which can lead to vulnerabilities without proper [Content Security Policy (CSP) headers](/docs/app/api-reference/next-config-js/headers#content-security-policy). Therefore, we recommended using the [`unoptimized`](#unoptimized) prop when the [`src`](#src) prop is known to be SVG. This happens automatically when `src` ends with `".svg"`. However, if you need to serve SVG images with the default Image Optimization API, you can set `dangerouslyAllowSVG` inside your `next.config.js`: next.config.js module.exports = { images: { dangerouslyAllowSVG: true, contentDispositionType: 'attachment', contentSecurityPolicy: "default-src 'self'; script-src 'none'; sandbox;", }, } In addition, it is strongly recommended to also set `contentDispositionType` to force the browser to download the image, as well as `contentSecurityPolicy` to prevent scripts embedded in the image from executing. [Animated Images](#animated-images) ----------------------------------- The default [loader](#loader) will automatically bypass Image Optimization for animated images and serve the image as-is. Auto-detection for animated files is best-effort and supports GIF, APNG, and WebP. If you want to explicitly bypass Image Optimization for a given animated image, use the [unoptimized](#unoptimized) prop. [Responsive Images](#responsive-images) --------------------------------------- The default generated `srcset` contains `1x` and `2x` images in order to support different device pixel ratios. However, you may wish to render a responsive image that stretches with the viewport. In that case, you'll need to set [`sizes`](#sizes) as well as `style` (or `className`). You can render a responsive image using one of the following methods below. ### [Responsive image using a static import](#responsive-image-using-a-static-import) If the source image is not dynamic, you can statically import to create a responsive image: components/author.js import Image from 'next/image' import me from '../photos/me.jpg' export default function Author() { return ( <Image src={me} alt="Picture of the author" sizes="100vw" style={{ width: '100%', height: 'auto', }} /> ) } Try it out: * [Demo the image responsive to viewport](https://image-component.nextjs.gallery/responsive) ### [Responsive image with aspect ratio](#responsive-image-with-aspect-ratio) If the source image is a dynamic or a remote url, you will also need to provide `width` and `height` to set the correct aspect ratio of the responsive image: components/page.js import Image from 'next/image' export default function Page({ photoUrl }) { return ( <Image src={photoUrl} alt="Picture of the author" sizes="100vw" style={{ width: '100%', height: 'auto', }} width={500} height={300} /> ) } Try it out: * [Demo the image responsive to viewport](https://image-component.nextjs.gallery/responsive) ### [Responsive image with `fill`](#responsive-image-with-fill) If you don't know the aspect ratio, you will need to set the [`fill`](#fill) prop and set `position: relative` on the parent. Optionally, you can set `object-fit` style depending on the desired stretch vs crop behavior: app/page.js import Image from 'next/image' export default function Page({ photoUrl }) { return ( <div style={{ position: 'relative', width: '300px', height: '500px' }}> <Image src={photoUrl} alt="Picture of the author" sizes="300px" fill style={{ objectFit: 'contain', }} /> </div> ) } Try it out: * [Demo the `fill` prop](https://image-component.nextjs.gallery/fill) [Theme Detection CSS](#theme-detection-css) ------------------------------------------- If you want to display a different image for light and dark mode, you can create a new component that wraps two `<Image>` components and reveals the correct one based on a CSS media query. components/theme-image.module.css .imgDark { display: none; } @media (prefers-color-scheme: dark) { .imgLight { display: none; } .imgDark { display: unset; } } components/theme-image.tsx TypeScript JavaScriptTypeScript import styles from './theme-image.module.css' import Image, { ImageProps } from 'next/image' type Props = Omit<ImageProps, 'src' | 'priority' | 'loading'> & { srcLight: string srcDark: string } const ThemeImage = (props: Props) => { const { srcLight, srcDark, ...rest } = props return ( <> <Image {...rest} src={srcLight} className={styles.imgLight} /> <Image {...rest} src={srcDark} className={styles.imgDark} /> </> ) } > **Good to know**: The default behavior of `loading="lazy"` ensures that only the correct image is loaded. You cannot use `priority` or `loading="eager"` because that would cause both images to load. Instead, you can use [`fetchPriority="high"`](https://developer.mozilla.org/docs/Web/API/HTMLImageElement/fetchPriority). Try it out: * [Demo light/dark mode theme detection](https://image-component.nextjs.gallery/theme) [getImageProps](#getimageprops) ------------------------------- For more advanced use cases, you can call `getImageProps()` to get the props that would be passed to the underlying `<img>` element, and instead pass to them to another component, style, canvas, etc. This also avoid calling React `useState()` so it can lead to better performance, but it cannot be used with the [`placeholder`](#placeholder) prop because the placeholder will never be removed. ### [Theme Detection Picture](#theme-detection-picture) If you want to display a different image for light and dark mode, you can use the [`<picture>`](https://developer.mozilla.org/docs/Web/HTML/Element/picture) element to display a different image based on the user's [preferred color scheme](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme). app/page.js import { getImageProps } from 'next/image' export default function Page() { const common = { alt: 'Theme Example', width: 800, height: 400 } const { props: { srcSet: dark }, } = getImageProps({ ...common, src: '/dark.png' }) const { props: { srcSet: light, ...rest }, } = getImageProps({ ...common, src: '/light.png' }) return ( <picture> <source media="(prefers-color-scheme: dark)" srcSet={dark} /> <source media="(prefers-color-scheme: light)" srcSet={light} /> <img {...rest} /> </picture> ) } ### [Art Direction](#art-direction) If you want to display a different image for mobile and desktop, sometimes called [Art Direction](https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images#art_direction), you can provide different `src`, `width`, `height`, and `quality` props to `getImageProps()`. app/page.js import { getImageProps } from 'next/image' export default function Home() { const common = { alt: 'Art Direction Example', sizes: '100vw' } const { props: { srcSet: desktop }, } = getImageProps({ ...common, width: 1440, height: 875, quality: 80, src: '/desktop.jpg', }) const { props: { srcSet: mobile, ...rest }, } = getImageProps({ ...common, width: 750, height: 1334, quality: 70, src: '/mobile.jpg', }) return ( <picture> <source media="(min-width: 1000px)" srcSet={desktop} /> <source media="(min-width: 500px)" srcSet={mobile} /> <img {...rest} style={{ width: '100%', height: 'auto' }} /> </picture> ) } ### [Background CSS](#background-css) You can even convert the `srcSet` string to the [`image-set()`](https://developer.mozilla.org/en-US/docs/Web/CSS/image/image-set) CSS function to optimize a background image. app/page.js import { getImageProps } from 'next/image' function getBackgroundImage(srcSet = '') { const imageSet = srcSet .split(', ') .map((str) => { const [url, dpi] = str.split(' ') return `url("${url}") ${dpi}` }) .join(', ') return `image-set(${imageSet})` } export default function Home() { const { props: { srcSet }, } = getImageProps({ alt: '', width: 128, height: 128, src: '/img.png' }) const backgroundImage = getBackgroundImage(srcSet) const style = { height: '100vh', width: '100vw', backgroundImage } return ( <main style={style}> <h1>Hello World</h1> </main> ) } [Known Browser Bugs](#known-browser-bugs) ----------------------------------------- This `next/image` component uses browser native [lazy loading](https://caniuse.com/loading-lazy-attr), which may fallback to eager loading for older browsers before Safari 15.4. When using the blur-up placeholder, older browsers before Safari 12 will fallback to empty placeholder. When using styles with `width`/`height` of `auto`, it is possible to cause [Layout Shift](https://web.dev/cls/) on older browsers before Safari 15 that don't [preserve the aspect ratio](https://caniuse.com/mdn-html_elements_img_aspect_ratio_computed_from_attributes). For more details, see [this MDN video](https://www.youtube.com/watch?v=4-d_SoCHeWE). * [Safari 15 - 16.3](https://bugs.webkit.org/show_bug.cgi?id=243601) display a gray border while loading. Safari 16.4 [fixed this issue](https://webkit.org/blog/13966/webkit-features-in-safari-16-4/#:~:text=Now%20in%20Safari%2016.4%2C%20a%20gray%20line%20no%20longer%20appears%20to%20mark%20the%20space%20where%20a%20lazy%2Dloaded%20image%20will%20appear%20once%20it%E2%80%99s%20been%20loaded.). Possible solutions: * Use CSS `@supports (font: -apple-system-body) and (-webkit-appearance: none) { img[loading="lazy"] { clip-path: inset(0.6px) } }` * Use [`priority`](#priority) if the image is above the fold * [Firefox 67+](https://bugzilla.mozilla.org/show_bug.cgi?id=1556156) displays a white background while loading. Possible solutions: * Enable [AVIF `formats`](#formats) * Use [`placeholder`](#placeholder) [Version History](#version-history) ----------------------------------- Version Changes `v14.2.0` `overrideSrc` prop added. `v14.1.0` `getImageProps()` is stable. `v14.0.0` `onLoadingComplete` prop and `domains` config deprecated. `v13.4.14` `placeholder` prop support for `data:/image...` `v13.2.0` `contentDispositionType` configuration added. `v13.0.6` `ref` prop added. `v13.0.0` The `next/image` import was renamed to `next/legacy/image`. The `next/future/image` import was renamed to `next/image`. A [codemod is available](/docs/app/building-your-application/upgrading/codemods#next-image-to-legacy-image) to safely and automatically rename your imports. `<span>` wrapper removed. `layout`, `objectFit`, `objectPosition`, `lazyBoundary`, `lazyRoot` props removed. `alt` is required. `onLoadingComplete` receives reference to `img` element. Built-in loader config removed. `v12.3.0` `remotePatterns` and `unoptimized` configuration is stable. `v12.2.0` Experimental `remotePatterns` and experimental `unoptimized` configuration added. `layout="raw"` removed. `v12.1.1` `style` prop added. Experimental support for `layout="raw"` added. `v12.1.0` `dangerouslyAllowSVG` and `contentSecurityPolicy` configuration added. `v12.0.9` `lazyRoot` prop added. `v12.0.0` `formats` configuration added. AVIF support added. Wrapper `<div>` changed to `<span>`. `v11.1.0` `onLoadingComplete` and `lazyBoundary` props added. `v11.0.0` `src` prop support for static import. `placeholder` prop added. `blurDataURL` prop added. `v10.0.5` `loader` prop added. `v10.0.1` `layout` prop added. `v10.0.0` `next/image` introduced. [Previous Font ](/docs/app/api-reference/components/font) [Next <Link> ](/docs/app/api-reference/components/link) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Built-in Components](#built-in-components) * [Metadata](#metadata) * [Static Assets](#static-assets) * [Analytics and Monitoring](#analytics-and-monitoring) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/06-optimizing/index.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[Building Your Application](/docs/app/building-your-application)Optimizing Optimizations ============= Next.js comes with a variety of built-in optimizations designed to improve your application's speed and [Core Web Vitals](https://web.dev/vitals/). This guide will cover the optimizations you can leverage to enhance your user experience. [Built-in Components](#built-in-components) ------------------------------------------- Built-in components abstract away the complexity of implementing common UI optimizations. These components are: * **Images**: Built on the native `<img>` element. The Image Component optimizes images for performance by lazy loading and automatically resizing images based on device size. * **Link**: Built on the native `<a>` tags. The Link Component prefetches pages in the background, for faster and smoother page transitions. * **Scripts**: Built on the native `<script>` tags. The Script Component gives you control over loading and execution of third-party scripts. [Metadata](#metadata) --------------------- Metadata helps search engines understand your content better (which can result in better SEO), and allows you to customize how your content is presented on social media, helping you create a more engaging and consistent user experience across various platforms. The Metadata API in Next.js allows you to modify the `<head>` element of a page. You can configure metadata in two ways: * **Config-based Metadata**: Export a [static `metadata` object](/docs/app/api-reference/functions/generate-metadata#metadata-object) or a dynamic [`generateMetadata` function](/docs/app/api-reference/functions/generate-metadata#generatemetadata-function) in a `layout.js` or `page.js` file. * **File-based Metadata**: Add static or dynamically generated special files to route segments. Additionally, you can create dynamic Open Graph Images using JSX and CSS with [imageResponse](/docs/app/api-reference/functions/image-response) constructor. [Static Assets](#static-assets) ------------------------------- Next.js `/public` folder can be used to serve static assets like images, fonts, and other files. Files inside `/public` can also be cached by CDN providers so that they are delivered efficiently. [Analytics and Monitoring](#analytics-and-monitoring) ----------------------------------------------------- For large applications, Next.js integrates with popular analytics and monitoring tools to help you understand how your application is performing. Learn more in the [OpenTelemetry](/docs/pages/building-your-application/optimizing/open-telemetry) and [Instrumentation](/docs/pages/building-your-application/optimizing/instrumentation) guides. [ ### Images Optimize your images with the built-in \`next/image\` component. ](/docs/app/building-your-application/optimizing/images)[ ### Videos Recommendations and best practices for optimizing videos in your Next.js application. ](/docs/app/building-your-application/optimizing/videos)[ ### Fonts Optimize your application's web fonts with the built-in \`next/font\` loaders. ](/docs/app/building-your-application/optimizing/fonts)[ ### Metadata Use the Metadata API to define metadata in any layout or page. ](/docs/app/building-your-application/optimizing/metadata)[ ### Scripts Optimize 3rd party scripts with the built-in Script component. ](/docs/app/building-your-application/optimizing/scripts)[ ### Bundle Analyzer Analyze the size of your JavaScript bundles using the @next/bundle-analyzer plugin. ](/docs/app/building-your-application/optimizing/bundle-analyzer)[ ### Lazy Loading Lazy load imported libraries and React Components to improve your application's loading performance. ](/docs/app/building-your-application/optimizing/lazy-loading)[ ### Analytics Measure and track page performance using Next.js Speed Insights ](/docs/app/building-your-application/optimizing/analytics)[ ### Instrumentation Learn how to use instrumentation to run code at server startup in your Next.js app ](/docs/app/building-your-application/optimizing/instrumentation)[ ### OpenTelemetry Learn how to instrument your Next.js app with OpenTelemetry. ](/docs/app/building-your-application/optimizing/open-telemetry)[ ### Static Assets Next.js allows you to serve static files, like images, in the public directory. You can learn how it works here. ](/docs/app/building-your-application/optimizing/static-assets)[ ### Third Party Libraries Optimize the performance of third-party libraries in your application with the \`@next/third-parties\` package. ](/docs/app/building-your-application/optimizing/third-party-libraries)[ ### Memory Usage Optimize memory used by your application in development and production. ](/docs/app/building-your-application/optimizing/memory-usage) [Previous Sass ](/docs/app/building-your-application/styling/sass) [Next Images ](/docs/app/building-your-application/optimizing/images) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [cookies](#cookies) * [set(name, value)](#setname-value) * [get(name)](#getname) * [getAll()](#getall) * [delete(name)](#deletename) * [has(name)](#hasname) * [clear()](#clear) * [nextUrl](#nexturl) * [ip](#ip) * [geo](#geo) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/02-api-reference/04-functions/next-request.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/api-reference)[Functions](/docs/app/api-reference/functions)NextRequest NextRequest =========== NextRequest extends the [Web Request API](https://developer.mozilla.org/docs/Web/API/Request) with additional convenience methods. [`cookies`](#cookies) --------------------- Read or mutate the [`Set-Cookie`](https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie) header of the request. ### [`set(name, value)`](#setname-value) Given a name, set a cookie with the given value on the request. // Given incoming request /home // Set a cookie to hide the banner // request will have a `Set-Cookie:show-banner=false;path=/home` header request.cookies.set('show-banner', 'false') ### [`get(name)`](#getname) Given a cookie name, return the value of the cookie. If the cookie is not found, `undefined` is returned. If multiple cookies are found, the first one is returned. // Given incoming request /home // { name: 'show-banner', value: 'false', Path: '/home' } request.cookies.get('show-banner') ### [`getAll()`](#getall) Given a cookie name, return the values of the cookie. If no name is given, return all cookies on the request. // Given incoming request /home // [ // { name: 'experiments', value: 'new-pricing-page', Path: '/home' }, // { name: 'experiments', value: 'winter-launch', Path: '/home' }, // ] request.cookies.getAll('experiments') // Alternatively, get all cookies for the request request.cookies.getAll() ### [`delete(name)`](#deletename) Given a cookie name, delete the cookie from the request. // Returns true for deleted, false is nothing is deleted request.cookies.delete('experiments') ### [`has(name)`](#hasname) Given a cookie name, return `true` if the cookie exists on the request. // Returns true if cookie exists, false if it does not request.cookies.has('experiments') ### [`clear()`](#clear) Remove the `Set-Cookie` header from the request. request.cookies.clear() [`nextUrl`](#nexturl) --------------------- Extends the native [`URL`](https://developer.mozilla.org/docs/Web/API/URL) API with additional convenience methods, including Next.js specific properties. // Given a request to /home, pathname is /home request.nextUrl.pathname // Given a request to /home?name=lee, searchParams is { 'name': 'lee' } request.nextUrl.searchParams The following options are available: Property Type Description `basePath` `string` The [base path](/docs/app/api-reference/next-config-js/basePath) of the URL. `buildId` `string` | `undefined` The build identifier of the Next.js application. Can be [customized](/docs/app/api-reference/next-config-js/generateBuildId). `pathname` `string` The pathname of the URL. `searchParams` `Object` The search parameters of the URL. > **Note:** The internationalization properties from the Pages Router are not available for usage in the App Router. Learn more about [internationalization with the App Router](/docs/app/building-your-application/routing/internationalization). [`ip`](#ip) ----------- The `ip` property is a string that contains the IP address of the request. This value can optionally be provided by your hosting platform. > **Good to know:** On [Vercel](https://vercel.com/docs/frameworks/nextjs?utm_source=next-site&utm_medium=docs&utm_campaign=next-website), this value is provided by default. On other platforms, you can use the [`X-Forwarded-For`](https://developer.mozilla.org/docs/Web/HTTP/Headers/X-Forwarded-For) header to provide the IP address. // Provided by Vercel request.ip // Self-hosting request.headers.get('X-Forwarded-For') [`geo`](#geo) ------------- The `geo` property is an object that contains the geographic information of the request. This value can optionally be provided by your hosting platform. > **Good to know:** On [Vercel](https://vercel.com/docs/frameworks/nextjs?utm_source=next-site&utm_medium=docs&utm_campaign=next-website), this value is provided by default. On other platforms, you can use the [`X-Forwarded-For`](https://developer.mozilla.org/docs/Web/HTTP/Headers/X-Forwarded-For) header to provide the IP address, then use a [third-party service](https://ip-api.com/) to lookup the geographic information. // Provided by Vercel request.geo.city request.geo.country request.geo.region request.geo.latitude request.geo.longitude // Self-hosting function getGeo(request) { let ip = request.headers.get('X-Forwarded-For') // Use a third-party service to lookup the geographic information } [Previous ImageResponse ](/docs/app/api-reference/functions/image-response) [Next NextResponse ](/docs/app/api-reference/functions/next-response) Was this helpful? supported. Send

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[Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [Convention](#convention) * [Examples](#examples) * [Organize routes without affecting the URL path](#organize-routes-without-affecting-the-url-path) * [Opting specific segments into a layout](#opting-specific-segments-into-a-layout) * [Creating multiple root layouts](#creating-multiple-root-layouts) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/07-route-groups.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Route Groups Route Groups ============ In the `app` directory, nested folders are normally mapped to URL paths. However, you can mark a folder as a **Route Group** to prevent the folder from being included in the route's URL path. This allows you to organize your route segments and project files into logical groups without affecting the URL path structure. Route groups are useful for: * [Organizing routes into groups](#organize-routes-without-affecting-the-url-path) e.g. by site section, intent, or team. * Enabling [nested layouts](/docs/app/building-your-application/routing/pages-and-layouts) in the same route segment level: * [Creating multiple nested layouts in the same segment, including multiple root layouts](#creating-multiple-root-layouts) * [Adding a layout to a subset of routes in a common segment](#opting-specific-segments-into-a-layout) [Convention](#convention) ------------------------- A route group can be created by wrapping a folder's name in parenthesis: `(folderName)` [Examples](#examples) --------------------- ### [Organize routes without affecting the URL path](#organize-routes-without-affecting-the-url-path) To organize routes without affecting the URL, create a group to keep related routes together. The folders in parenthesis will be omitted from the URL (e.g. `(marketing)` or `(shop)`).  Even though routes inside `(marketing)` and `(shop)` share the same URL hierarchy, you can create a different layout for each group by adding a `layout.js` file inside their folders.  ### [Opting specific segments into a layout](#opting-specific-segments-into-a-layout) To opt specific routes into a layout, create a new route group (e.g. `(shop)`) and move the routes that share the same layout into the group (e.g. `account` and `cart`). The routes outside of the group will not share the layout (e.g. `checkout`).  ### [Creating multiple root layouts](#creating-multiple-root-layouts) To create multiple [root layouts](/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required), remove the top-level `layout.js` file, and add a `layout.js` file inside each route groups. This is useful for partitioning an application into sections that have a completely different UI or experience. The `<html>` and `<body>` tags need to be added to each root layout.  In the example above, both `(marketing)` and `(shop)` have their own root layout. * * * > **Good to know**: > > * The naming of route groups has no special significance other than for organization. They do not affect the URL path. > * Routes that include a route group **should not** resolve to the same URL path as other routes. For example, since route groups don't affect URL structure, `(marketing)/about/page.js` and `(shop)/about/page.js` would both resolve to `/about` and cause an error. > * If you use multiple root layouts without a top-level `layout.js` file, your home `page.js` file should be defined in one of the route groups, For example: `app/(marketing)/page.js`. > * Navigating **across multiple root layouts** will cause a **full page load** (as opposed to a client-side navigation). For example, navigating from `/cart` that uses `app/(shop)/layout.js` to `/blog` that uses `app/(marketing)/layout.js` will cause a full page load. This **only** applies to multiple root layouts. [Previous Redirecting ](/docs/app/building-your-application/routing/redirecting) [Next Project Organization ](/docs/app/building-your-application/routing/colocation) Was this helpful? supported. Send

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[Redirecting](/docs/pages/building-your-application/routing/redirecting) * [Custom App](/docs/pages/building-your-application/routing/custom-app) * [Custom Document](/docs/pages/building-your-application/routing/custom-document) * [API Routes](/docs/pages/building-your-application/routing/api-routes) * [Custom Errors](/docs/pages/building-your-application/routing/custom-error) * [Internationalization](/docs/pages/building-your-application/routing/internationalization) * [Middleware](/docs/pages/building-your-application/routing/middleware) * [Rendering](/docs/pages/building-your-application/rendering) * [Server-side Rendering (SSR)](/docs/pages/building-your-application/rendering/server-side-rendering) * [Static Site Generation (SSG)](/docs/pages/building-your-application/rendering/static-site-generation) * [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization) * [Client-side Rendering 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Exports](/docs/pages/building-your-application/deploying/static-exports) * [Multi Zones](/docs/pages/building-your-application/deploying/multi-zones) * [Continuous Integration (CI) Build Caching](/docs/pages/building-your-application/deploying/ci-build-caching) * [Upgrading](/docs/pages/building-your-application/upgrading) * [Codemods](/docs/pages/building-your-application/upgrading/codemods) * [From Pages to App](/docs/pages/building-your-application/upgrading/app-router-migration) * [Migrating from Vite](/docs/pages/building-your-application/upgrading/from-vite) * [Migrating from Create React App](/docs/pages/building-your-application/upgrading/from-create-react-app) * [Version 14](/docs/pages/building-your-application/upgrading/version-14) * [Version 13](/docs/pages/building-your-application/upgrading/version-13) * [Version 12](/docs/pages/building-your-application/upgrading/version-12) * [Version 11](/docs/pages/building-your-application/upgrading/version-11) * [Version 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* [NextResponse](/docs/pages/api-reference/functions/next-response) * [useAmp](/docs/pages/api-reference/functions/use-amp) * [useReportWebVitals](/docs/pages/api-reference/functions/use-report-web-vitals) * [useRouter](/docs/pages/api-reference/functions/use-router) * [userAgent](/docs/pages/api-reference/functions/userAgent) * [next.config.js Options](/docs/pages/api-reference/next-config-js) * [assetPrefix](/docs/pages/api-reference/next-config-js/assetPrefix) * [basePath](/docs/pages/api-reference/next-config-js/basePath) * [compress](/docs/pages/api-reference/next-config-js/compress) * [crossOrigin](/docs/pages/api-reference/next-config-js/crossOrigin) * [devIndicators](/docs/pages/api-reference/next-config-js/devIndicators) * [distDir](/docs/pages/api-reference/next-config-js/distDir) * [env](/docs/pages/api-reference/next-config-js/env) * [eslint](/docs/pages/api-reference/next-config-js/eslint) * [exportPathMap](/docs/pages/api-reference/next-config-js/exportPathMap) * [generateBuildId](/docs/pages/api-reference/next-config-js/generateBuildId) * [generateEtags](/docs/pages/api-reference/next-config-js/generateEtags) * [headers](/docs/pages/api-reference/next-config-js/headers) * [httpAgentOptions](/docs/pages/api-reference/next-config-js/httpAgentOptions) * [images](/docs/pages/api-reference/next-config-js/images) * [instrumentationHook](/docs/pages/api-reference/next-config-js/instrumentationHook) * [onDemandEntries](/docs/pages/api-reference/next-config-js/onDemandEntries) * [optimizePackageImports](/docs/pages/api-reference/next-config-js/optimizePackageImports) * [output](/docs/pages/api-reference/next-config-js/output) * [pageExtensions](/docs/pages/api-reference/next-config-js/pageExtensions) * [poweredByHeader](/docs/pages/api-reference/next-config-js/poweredByHeader) * [productionBrowserSourceMaps](/docs/pages/api-reference/next-config-js/productionBrowserSourceMaps) * [reactStrictMode](/docs/pages/api-reference/next-config-js/reactStrictMode) * [redirects](/docs/pages/api-reference/next-config-js/redirects) * [rewrites](/docs/pages/api-reference/next-config-js/rewrites) * [Runtime Config](/docs/pages/api-reference/next-config-js/runtime-configuration) * [trailingSlash](/docs/pages/api-reference/next-config-js/trailingSlash) * [transpilePackages](/docs/pages/api-reference/next-config-js/transpilePackages) * [turbo](/docs/pages/api-reference/next-config-js/turbo) * [typescript](/docs/pages/api-reference/next-config-js/typescript) * [urlImports](/docs/pages/api-reference/next-config-js/urlImports) * [webpack](/docs/pages/api-reference/next-config-js/webpack) * [webVitalsAttribution](/docs/pages/api-reference/next-config-js/webVitalsAttribution) * [create-next-app](/docs/pages/api-reference/create-next-app) * [Next.js CLI](/docs/pages/api-reference/next-cli) * [Edge Runtime](/docs/pages/api-reference/edge) * [Architecture](/docs/architecture) * [Accessibility](/docs/architecture/accessibility) * [Fast Refresh](/docs/architecture/fast-refresh) * [Next.js Compiler](/docs/architecture/nextjs-compiler) * [Supported Browsers](/docs/architecture/supported-browsers) * [Turbopack](/docs/architecture/turbopack) * [Community](/docs/community) * [Contribution Guide](/docs/community/contribution-guide) On this page * [redirect function](#redirect-function) * [permanentRedirect function](#permanentredirect-function) * [useRouter() hook](#userouter-hook) * [redirects in next.config.js](#redirects-in-nextconfigjs) * [NextResponse.redirect in Middleware](#nextresponseredirect-in-middleware) * [Managing redirects at scale (advanced)](#managing-redirects-at-scale-advanced) * [1\. Creating and storing a redirect map](#1-creating-and-storing-a-redirect-map) * [2\. Optimizing data lookup performance](#2-optimizing-data-lookup-performance) * [Next Steps](#next-steps) [Edit this page on GitHub](https://github.com/vercel/next.js/edit/canary/docs/02-app/01-building-your-application/01-routing/06-redirecting.mdx) [Managed Next.js (Vercel)](https://vercel.com/solutions/nextjs?utm_source=next_site&utm_medium=web&utm_campaign=managed_nextjs_solutions_page) Scroll to top [App Router](/docs/app)[...](/docs/app/building-your-application)[Routing](/docs/app/building-your-application/routing)Redirecting Redirecting =========== There are a few ways you can handle redirects in Next.js. This page will go through each available option, use cases, and how to manage large numbers of redirects. API Purpose Where Status Code [`redirect`](#redirect-function) Redirect user after a mutation or event Server Components, Server Actions, Route Handlers 307 (Temporary) or 303 (Server Action) [`permanentRedirect`](#permanentredirect-function) Redirect user after a mutation or event Server Components, Server Actions, Route Handlers 308 (Permanent) [`useRouter`](#userouter-hook) Perform a client-side navigation Event Handlers in Client Components N/A [`redirects` in `next.config.js`](#redirects-in-nextconfigjs) Redirect an incoming request based on a path `next.config.js` file 307 (Temporary) or 308 (Permanent) [`NextResponse.redirect`](#nextresponseredirect-in-middleware) Redirect an incoming request based on a condition Middleware Any [`redirect` function](#redirect-function) ----------------------------------------- The `redirect` function allows you to redirect the user to another URL. You can call `redirect` in [Server Components](/docs/app/building-your-application/rendering/server-components), [Route Handlers](/docs/app/building-your-application/routing/route-handlers), and [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). `redirect` is often used after a mutation or event. For example, creating a post: app/actions.tsx TypeScript JavaScriptTypeScript 'use server' import { redirect } from 'next/navigation' import { revalidatePath } from 'next/cache' export async function createPost(id: string) { try { // Call database } catch (error) { // Handle errors } revalidatePath('/posts') // Update cached posts redirect(`/post/${id}`) // Navigate to the new post page } > **Good to know**: > > * `redirect` returns a 307 (Temporary Redirect) status code by default. When used in a Server Action, it returns a 303 (See Other), which is commonly used for redirecting to a success page as a result of a POST request. > * `redirect` internally throws an error so it should be called outside of `try/catch` blocks. > * `redirect` can be called in Client Components during the rendering process but not in event handlers. You can use the [`useRouter` hook](#userouter-hook) instead. > * `redirect` also accepts absolute URLs and can be used to redirect to external links. > * If you'd like to redirect before the render process, use [`next.config.js`](#redirects-in-nextconfigjs) or [Middleware](#nextresponseredirect-in-middleware). See the [`redirect` API reference](/docs/app/api-reference/functions/redirect) for more information. [`permanentRedirect` function](#permanentredirect-function) ----------------------------------------------------------- The `permanentRedirect` function allows you to **permanently** redirect the user to another URL. You can call `permanentRedirect` in [Server Components](/docs/app/building-your-application/rendering/server-components), [Route Handlers](/docs/app/building-your-application/routing/route-handlers), and [Server Actions](/docs/app/building-your-application/data-fetching/server-actions-and-mutations). `permanentRedirect` is often used after a mutation or event that changes an entity's canonical URL, such as updating a user's profile URL after they change their username: app/actions.ts TypeScript JavaScriptTypeScript 'use server' import { permanentRedirect } from 'next/navigation' import { revalidateTag } from 'next/cache' export async function updateUsername(username: string, formData: FormData) { try { // Call database } catch (error) { // Handle errors } revalidateTag('username') // Update all references to the username permanentRedirect(`/profile/${username}`) // Navigate to the new user profile } > **Good to know**: > > * `permanentRedirect` returns a 308 (permanent redirect) status code by default. > * `permanentRedirect` also accepts absolute URLs and can be used to redirect to external links. > * If you'd like to redirect before the render process, use [`next.config.js`](#redirects-in-nextconfigjs) or [Middleware](#nextresponseredirect-in-middleware). See the [`permanentRedirect` API reference](/docs/app/api-reference/functions/permanentRedirect) for more information. [`useRouter()` hook](#userouter-hook) ------------------------------------- If you need to redirect inside an event handler in a Client Component, you can use the `push` method from the `useRouter` hook. For example: app/page.tsx TypeScript JavaScriptTypeScript 'use client' import { useRouter } from 'next/navigation' export default function Page() { const router = useRouter() return ( <button type="button" onClick={() => router.push('/dashboard')}> Dashboard </button> ) } > **Good to know**: > > * If you don't need to programmatically navigate a user, you should use a [`<Link>`](/docs/app/api-reference/components/link) component. See the [`useRouter` API reference](/docs/app/api-reference/functions/use-router) for more information. [`redirects` in `next.config.js`](#redirects-in-nextconfigjs) ------------------------------------------------------------- The `redirects` option in the `next.config.js` file allows you to redirect an incoming request path to a different destination path. This is useful when you change the URL structure of pages or have a list of redirects that are known ahead of time. `redirects` supports [path](/docs/app/api-reference/next-config-js/redirects#path-matching), [header, cookie, and query matching](/docs/app/api-reference/next-config-js/redirects#header-cookie-and-query-matching), giving you the flexibility to redirect users based on an incoming request. To use `redirects`, add the option to your `next.config.js` file: next.config.js module.exports = { async redirects() { return [ // Basic redirect { source: '/about', destination: '/', permanent: true, }, // Wildcard path matching { source: '/blog/:slug', destination: '/news/:slug', permanent: true, }, ] }, } See the [`redirects` API reference](/docs/app/api-reference/next-config-js/redirects) for more information. > **Good to know**: > > * `redirects` can return a 307 (Temporary Redirect) or 308 (Permanent Redirect) status code with the `permanent` option. > * `redirects` may have a limit on platforms. For example, on Vercel, there's a limit of 1,024 redirects. To manage a large number of redirects (1000+), consider creating a custom solution using [Middleware](/docs/app/building-your-application/routing/middleware). See [managing redirects at scale](#managing-redirects-at-scale-advanced) for more. > * `redirects` runs **before** Middleware. [`NextResponse.redirect` in Middleware](#nextresponseredirect-in-middleware) ---------------------------------------------------------------------------- Middleware allows you to run code before a request is completed. Then, based on the incoming request, redirect to a different URL using `NextResponse.redirect`. This is useful if you want to redirect users based on a condition (e.g. authentication, session management, etc) or have [a large number of redirects](#managing-redirects-at-scale-advanced). For example, to redirect the user to a `/login` page if they are not authenticated: middleware.ts TypeScript JavaScriptTypeScript import { NextResponse, NextRequest } from 'next/server' import { authenticate } from 'auth-provider' export function middleware(request: NextRequest) { const isAuthenticated = authenticate(request) // If the user is authenticated, continue as normal if (isAuthenticated) { return NextResponse.next() } // Redirect to login page if not authenticated return NextResponse.redirect(new URL('/login', request.url)) } export const config = { matcher: '/dashboard/:path*', } > **Good to know**: > > * Middleware runs **after** `redirects` in `next.config.js` and **before** rendering. See the [Middleware](/docs/app/building-your-application/routing/middleware) documentation for more information. [Managing redirects at scale (advanced)](#managing-redirects-at-scale-advanced) ------------------------------------------------------------------------------- To manage a large number of redirects (1000+), you may consider creating a custom solution using Middleware. This allows you to handle redirects programmatically without having to redeploy your application. To do this, you'll need to consider: 1. Creating and storing a redirect map. 2. Optimizing data lookup performance. > **Next.js Example**: See our [Middleware with Bloom filter](https://redirects-bloom-filter.vercel.app/) example for an implementation of the recommendations below. ### [1\. Creating and storing a redirect map](#1-creating-and-storing-a-redirect-map) A redirect map is a list of redirects that you can store in a database (usually a key-value store) or JSON file. Consider the following data structure: { "/old": { "destination": "/new", "permanent": true }, "/blog/post-old": { "destination": "/blog/post-new", "permanent": true } } In [Middleware](/docs/app/building-your-application/routing/middleware), you can read from a database such as Vercel's [Edge Config](https://vercel.com/docs/storage/edge-config/get-started?utm_source=next-site&utm_medium=docs&utm_campaign=next-website) or [Redis](https://vercel.com/docs/storage/vercel-kv?utm_source=next-site&utm_medium=docs&utm_campaign=next-website), and redirect the user based on the incoming request: middleware.ts TypeScript JavaScriptTypeScript import { NextResponse, NextRequest } from 'next/server' import { get } from '@vercel/edge-config' type RedirectEntry = { destination: string permanent: boolean } export async function middleware(request: NextRequest) { const pathname = request.nextUrl.pathname const redirectData = await get(pathname) if (redirectData && typeof redirectData === 'string') { const redirectEntry: RedirectEntry = JSON.parse(redirectData) const statusCode = redirectEntry.permanent ? 308 : 307 return NextResponse.redirect(redirectEntry.destination, statusCode) } // No redirect found, continue without redirecting return NextResponse.next() } ### [2\. Optimizing data lookup performance](#2-optimizing-data-lookup-performance) Reading a large dataset for every incoming request can be slow and expensive. There are two ways you can optimize data lookup performance: * Use a database that is optimized for fast reads, such as [Vercel Edge Config](https://vercel.com/docs/storage/edge-config/get-started?utm_source=next-site&utm_medium=docs&utm_campaign=next-website) or [Redis](https://vercel.com/docs/storage/vercel-kv?utm_source=next-site&utm_medium=docs&utm_campaign=next-website). * Use a data lookup strategy such as a [Bloom filter](https://en.wikipedia.org/wiki/Bloom_filter) to efficiently check if a redirect exists **before** reading the larger redirects file or database. Considering the previous example, you can import a generated bloom filter file into Middleware, then, check if the incoming request pathname exists in the bloom filter. If it does, forward the request to a [Route Handler](/docs/app/building-your-application/routing/route-handlers) which will check the actual file and redirect the user to the appropriate URL. This avoids importing a large redirects file into Middleware, which can slow down every incoming request. middleware.ts TypeScript JavaScriptTypeScript import { NextResponse, NextRequest } from 'next/server' import { ScalableBloomFilter } from 'bloom-filters' import GeneratedBloomFilter from './redirects/bloom-filter.json' type RedirectEntry = { destination: string permanent: boolean } // Initialize bloom filter from a generated JSON file const bloomFilter = ScalableBloomFilter.fromJSON(GeneratedBloomFilter as any) export async function middleware(request: NextRequest) { // Get the path for the incoming request const pathname = request.nextUrl.pathname // Check if the path is in the bloom filter if (bloomFilter.has(pathname)) { // Forward the pathname to the Route Handler const api = new URL( `/api/redirects?pathname=${encodeURIComponent(request.nextUrl.pathname)}`, request.nextUrl.origin ) try { // Fetch redirect data from the Route Handler const redirectData = await fetch(api) if (redirectData.ok) { const redirectEntry: RedirectEntry | undefined = await redirectData.json() if (redirectEntry) { // Determine the status code const statusCode = redirectEntry.permanent ? 308 : 307 // Redirect to the destination return NextResponse.redirect(redirectEntry.destination, statusCode) } } } catch (error) { console.error(error) } } // No redirect found, continue the request without redirecting return NextResponse.next() } Then, in the Route Handler: app/redirects/route.ts TypeScript JavaScriptTypeScript import { NextRequest, NextResponse } from 'next/server' import redirects from '@/app/redirects/redirects.json' type RedirectEntry = { destination: string permanent: boolean } export function GET(request: NextRequest) { const pathname = request.nextUrl.searchParams.get('pathname') if (!pathname) { return new Response('Bad Request', { status: 400 }) } // Get the redirect entry from the redirects.json file const redirect = (redirects as Record<string, RedirectEntry>)[pathname] // Account for bloom filter false positives if (!redirect) { return new Response('No redirect', { status: 400 }) } // Return the redirect entry return NextResponse.json(redirect) } > **Good to know:** > > * To generate a bloom filter, you can use a library like [`bloom-filters`](https://www.npmjs.com/package/bloom-filters). > * You should validate requests made to your Route Handler to prevent malicious requests. Next Steps ---------- [ App Router ... Functions ### redirect API Reference for the redirect function. ](/docs/app/api-reference/functions/redirect)[ App Router ... Functions ### permanentRedirect API Reference for the permanentRedirect function. ](/docs/app/api-reference/functions/permanentRedirect)[ App Router ... Routing ### Middleware Learn how to use Middleware to run code before a request is completed. ](/docs/app/building-your-application/routing/middleware)[ App Router ... next.config.js Options ### redirects Add redirects to your Next.js app. ](/docs/app/api-reference/next-config-js/redirects) [Previous Error Handling ](/docs/app/building-your-application/routing/error-handling) [Next Route Groups ](/docs/app/building-your-application/routing/route-groups) Was this helpful? supported. Send