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Serves a webpack app. Updates the browser on changes. Documentationhttps://webpack.js.org/configuration/dev-server/.

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webpack-dev-server

Usewebpack with a development server that provideslive reloading. This should be used fordevelopment only.

It useswebpack-dev-middleware under the hood, which providesfast in-memory access to the webpack assets.

Getting Started

First things first, install the module:

npm install webpack-dev-server --save-dev

yarn add -D webpack-dev-server

pnpm add -D webpack-dev-server

Note: While you can install and run webpack-dev-server globally, we recommendinstalling it locally. webpack-dev-server will always use a local installationover a global one.

Usage

There are two main, recommended methods of using the module:

With the CLI

The easiest way to use it is with thewebpack CLI. In the directory where yourwebpack.config.js is, run:

npx webpack serve

Following options are available withwebpack serve:

Usage: webpack serve|server|s [entries...] [options]Run the webpack dev server.Options:  -c, --config <value...>                             Provide path to a webpack configuration file e.g. ./webpack.config.js.  --config-name <value...>                            Name of the configuration to use.  -m, --merge                                         Merge two or more configurations using 'webpack-merge'.  --disable-interpret                                 Disable interpret for loading the config file.  --env <value...>                                    Environment passed to the configuration when it is a function.  --node-env <value>                                  Sets process.env.NODE_ENV to the specified value.  --define-process-env-node-env <value>               Sets process.env.NODE_ENV to the specified value. (Currently an alias for `--node-env`)  --analyze                                           It invokes webpack-bundle-analyzer plugin to get bundle information.  --progress [value]                                  Print compilation progress during build.  -j, --json [value]                                  Prints result as JSON or store it in a file.  --fail-on-warnings                                  Stop webpack-cli process with non-zero exit code on warnings from webpack  -d, --devtool <value>                               A developer tool to enhance debugging (false | eval | [inline-|hidden-|eval-][nosources-][cheap-[module-]]source-map).  --no-devtool                                        Negative 'devtool' option.  --entry <value...>                                  A module that is loaded upon startup. Only the last one is exported.  --mode <value>                                      Enable production optimizations or development hints.  --name <value>                                      Name of the configuration. Used when loading multiple configurations.  -o, --output-path <value>                           The output directory as **absolute path** (required).  --stats [value]                                     Stats options object or preset name.  --no-stats                                          Negative 'stats' option.  -t, --target <value...>                             Environment to build for. Environment to build for. An array of environments to build for all of them when possible.  --no-target                                         Negative 'target' option.  --watch-options-stdin                               Stop watching when stdin stream has ended.  --no-watch-options-stdin                            Negative 'watch-options-stdin' option.  --allowed-hosts <value...>                          Allows to enumerate the hosts from which access to the dev server are allowed (useful when you are proxying dev server, by default is 'auto').  --allowed-hosts-reset                               Clear all items provided in 'allowedHosts' configuration. Allows to enumerate the hosts from which access to the dev server are allowed (useful when you are proxying dev server, by default is 'auto').  --bonjour                                           Allows to broadcasts dev server via ZeroConf networking on start.  --no-bonjour                                        Disallows to broadcasts dev server via ZeroConf networking on start.  --no-client                                         Disables client script.  --client-logging <value>                            Allows to set log level in the browser.  --client-overlay                                    Enables a full-screen overlay in the browser when there are compiler errors or warnings.  --no-client-overlay                                 Disables the full-screen overlay in the browser when there are compiler errors or warnings.  --client-overlay-errors                             Enables a full-screen overlay in the browser when there are compiler errors.  --no-client-overlay-errors                          Disables the full-screen overlay in the browser when there are compiler errors.  --client-overlay-warnings                           Enables a full-screen overlay in the browser when there are compiler warnings.  --no-client-overlay-warnings                        Disables the full-screen overlay in the browser when there are compiler warnings.  --client-overlay-runtime-errors                     Enables a full-screen overlay in the browser when there are uncaught runtime errors.  --no-client-overlay-runtime-errors                  Disables the full-screen overlay in the browser when there are uncaught runtime errors.  --client-overlay-trusted-types-policy-name <value>  The name of a Trusted Types policy for the overlay. Defaults to 'webpack-dev-server#overlay'.  --client-progress                                   Prints compilation progress in percentage in the browser.  --no-client-progress                                Does not print compilation progress in percentage in the browser.  --client-reconnect [value]                          Tells dev-server the number of times it should try to reconnect the client.  --no-client-reconnect                               Tells dev-server to not to try to reconnect the client.  --client-web-socket-transport <value>               Allows to set custom web socket transport to communicate with dev server.  --client-web-socket-url <value>                     Allows to specify URL to web socket server (useful when you're proxying dev server and client script does not always know where to connect to).  --client-web-socket-url-hostname <value>            Tells clients connected to devServer to use the provided hostname.  --client-web-socket-url-pathname <value>            Tells clients connected to devServer to use the provided path to connect.  --client-web-socket-url-password <value>            Tells clients connected to devServer to use the provided password to authenticate.  --client-web-socket-url-port <value>                Tells clients connected to devServer to use the provided port.  --client-web-socket-url-protocol <value>            Tells clients connected to devServer to use the provided protocol.  --client-web-socket-url-username <value>            Tells clients connected to devServer to use the provided username to authenticate.  --compress                                          Enables gzip compression for everything served.  --no-compress                                       Disables gzip compression for everything served.  --history-api-fallback                              Allows to proxy requests through a specified index page (by default 'index.html'), useful for Single Page Applications that utilise the HTML5 History API.  --no-history-api-fallback                           Disallows to proxy requests through a specified index page.  --host <value>                                      Allows to specify a hostname to use.  --hot [value]                                       Enables Hot Module Replacement.  --no-hot                                            Disables Hot Module Replacement.  --ipc [value]                                       Listen to a unix socket.  --live-reload                                       Enables reload/refresh the page(s) when file changes are detected (enabled by default).  --no-live-reload                                    Disables reload/refresh the page(s) when file changes are detected (enabled by default).  --open [value...]                                   Allows to configure dev server to open the browser(s) and page(s) after server had been started (set it to true to open your default browser).  --no-open                                           Does not open the default browser.  --open-target <value...>                            Opens specified page in browser.  --open-app-name <value...>                          Open specified browser.  --open-reset                                        Clear all items provided in 'open' configuration. Allows to configure dev server to open the browser(s) and page(s) after server had been started (set it to true to open your default browser).  --open-target-reset                                 Clear all items provided in 'open.target' configuration. Opens specified page in browser.  --open-app-name-reset                               Clear all items provided in 'open.app.name' configuration. Open specified browser.  --port <value>                                      Allows to specify a port to use.  --server-type <value>                               Allows to set server and options (by default 'http').  --server-options-passphrase <value>                 Passphrase for a pfx file.  --server-options-request-cert                       Request for an SSL certificate.  --no-server-options-request-cert                    Does not request for an SSL certificate.  --server-options-ca <value...>                      Path to an SSL CA certificate or content of an SSL CA certificate.  --server-options-ca-reset                           Clear all items provided in 'server.options.ca' configuration. Path to an SSL CA certificate or content of an SSL CA certificate.  --server-options-cert <value...>                    Path to an SSL certificate or content of an SSL certificate.  --server-options-cert-reset                         Clear all items provided in 'server.options.cert' configuration. Path to an SSL certificate or content of an SSL certificate.  --server-options-crl <value...>                     Path to PEM formatted CRLs (Certificate Revocation Lists) or content of PEM formatted CRLs (Certificate Revocation Lists).  --server-options-crl-reset                          Clear all items provided in 'server.options.crl' configuration. Path to PEM formatted CRLs (Certificate Revocation Lists) or content of PEM formatted CRLs (Certificate Revocation Lists).  --server-options-key <value...>                     Path to an SSL key or content of an SSL key.  --server-options-key-reset                          Clear all items provided in 'server.options.key' configuration. Path to an SSL key or content of an SSL key.  --server-options-pfx <value...>                     Path to an SSL pfx file or content of an SSL pfx file.  --server-options-pfx-reset                          Clear all items provided in 'server.options.pfx' configuration. Path to an SSL pfx file or content of an SSL pfx file.  --static [value...]                                 Allows to configure options for serving static files from directory (by default 'public' directory).  --no-static                                         Disallows to configure options for serving static files from directory.  --static-directory <value...>                       Directory for static contents.  --static-public-path <value...>                     The static files will be available in the browser under this public path.  --static-serve-index                                Tells dev server to use serveIndex middleware when enabled.  --no-static-serve-index                             Does not tell dev server to use serveIndex middleware.  --static-watch                                      Watches for files in static content directory.  --no-static-watch                                   Does not watch for files in static content directory.  --static-reset                                      Clear all items provided in 'static' configuration. Allows to configure options for serving static files from directory (by default 'public' directory).  --static-public-path-reset                          Clear all items provided in 'static.publicPath' configuration. The static files will be available in the browser under this public path.  --watch-files <value...>                            Allows to configure list of globs/directories/files to watch for file changes.  --watch-files-reset                                 Clear all items provided in 'watchFiles' configuration. Allows to configure list of globs/directories/files to watch for file changes.  --no-web-socket-server                              Disallows to set web socket server and options.  --web-socket-server-type <value>                    Allows to set web socket server and options (by default 'ws').Global options:  --color                                             Enable colors on console.  --no-color                                          Disable colors on console.  -v, --version                                       Output the version number of 'webpack', 'webpack-cli' and 'webpack-dev-server' and commands.  -h, --help [verbose]                                Display help for commands and options.To see list of all supported commands and options run 'webpack --help=verbose'.Webpack documentation: https://webpack.js.org/.CLI documentation: https://webpack.js.org/api/cli/.Made with ♥ by the webpack team.

Note

Detailed documentation for above options is available on thislink.

With NPM Scripts

NPM package.json scripts are a convenient and useful means to run locally installedbinaries without having to be concerned about their full paths. Simply define ascript as such:

{"scripts": {"serve":"webpack serve"  }}

And run the following in your terminal/console:

npm run serve

NPM will automatically refer to the the binary innode_modules for you, andexecute the file or command.

With the API

While it's recommended to run webpack-dev-server via the CLI, you may also choose to start a server via the API.

With TypeScript

If you use TypeScript in the webpack config, you'll need to properly typedevServer property in order to avoid TS errors (e.g.'devServer' does not exist in type 'Configuration'). For that use either:

/// <reference path="node_modules/webpack-dev-server/types/lib/Server.d.ts"/>import{typeConfiguration}from"webpack";// Your logic

Or you can import the type fromwebpack-dev-server, i.e.

import{typeConfiguration}from"webpack";import{typeConfigurationasDevServerConfiguration}from"webpack-dev-server";constdevServer:DevServerConfiguration={};constconfig:Configuration={ devServer};// module.exportsexportdefaultconfig;

The Result

Either method will start a server instance and begin listening for connectionsfromlocalhost on port8080.

webpack-dev-server is configured by default to support live-reload of files asyou edit your assets while the server is running.

Seethe documentation for more use cases and options.

Browser Support

Whilewebpack-dev-server transpiles the client (browser) scripts to an ES5state, the project only officially supports thelast two versions of majorbrowsers. We simply don't have the resources to support every whackybrowser out there.

If you find a bug with an obscure / old browser, we would actively welcome aPull Request to resolve the bug.

Support

We do our best to keep issues in the repository focused on bugs, features, andneeded modifications to the code for the module. Because of that, we ask userswith general support, "how-to", or "why isn't this working" questions to try oneof the other support channels that are available.

Your first-stop-shop for support for webpack-dev-server should be the excellentdocumentation for the module. If you see an opportunity for improvementof those docs, please head over to thewebpack.js.org repo and open apull request.

From there, we encourage users to visit thewebpack discussions andtalk to the fine folks there. If your quest for answers comes up dry in chat,head over toStackOverflow and do a quick search or open a newquestion. Remember; It's always much easier to answer questions that include yourwebpack.config.js and relevant files!

If you're twitter-savvy you can tweet#webpack with your questionand someone should be able to reach out and lend a hand.

If you have discovered a 🐛, have a feature suggestion, or would like to seea modification, please feel free to create an issue on Github.Note: The issuetemplate isn't optional, so please be sure not to remove it, and please fill itout completely.