Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.






webpack is a bundler for modules. The main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset.


  • Bundles both CommonJsand AMDmodules (even combined).
  • Can create a single bundle or multiple chunks that are asynchronously loaded at runtime (to reduce initial loading time).
  • Dependencies are resolved during compilation reducing the runtime size.
  • Loaders can preprocess files while compiling, e.g. coffeescript to JavaScript, handlebars strings to compiled functions, images to Base64, etc.
  • Highly modular plugin system to do whatever else your application requires.
Getting Started

Check out webpack's documentationfor quick Getting Started guide, in-depth usage, tutorials and resources.


project: npm install webpack --save-dev

global: npm install webpack -gUsage


Take a look at the examplesfolder.



webpack has a rich plugin interface. Most of the features within webpack itself use this plugin interface. This makes webpack very flexible.


webpack uses async I/O and has multiple caching levels. This makes webpack fast and incredibly faston incremental compilations.


webpack enables use of loaders to preprocess files. This allows you to bundle any static resourceway beyond JavaScript. You can easily write your own loadersusing node.js.

Loaders are activated by using loadername!prefixes in require()statements, or are automatically applied via regex from your webpack configuration.

Please see Using Loadersfor more information.


  • json: Loads file as JSON
  • raw: Loads raw content of a file (as utf-8)
  • val: Executes code as module and consider exports as JavaScript code
  • script: Executes a JavaScript file once in global context (like in script tag), requires are not parsed.


  • file: Emits the file into the output folder and returns the (relative) url.
  • url: The url loader works like the file loader, but can return a Data Url if the file is smaller than a limit.
  • image: Compresses your images. Ideal to use together with fileor url.
  • svgo-loader: Compresses SVG images using svgolibrary
  • baggage: Automatically require any resources related to the required one
  • polymer-loader: Process HTML & CSS with preprocessor of choice and require()Web Components like first-class modules.



  • html: Exports HTML as string, require references to static resources.
  • jade: Loads jade template and returns a function
  • handlebars: Loads handlebars template and returns a function
  • ractive: Pre-compiles Ractive templates for interactive DOM manipulation
  • markdown: Compiles Markdown to HTML
  • ng-cache: Puts HTML partials in the Angular's $templateCache


  • style: Add exports of a module as style to DOM
  • css: Loads css file with resolved imports and returns css code
  • cssnext: Loads and compiles a css file using cssnext
  • less: Loads and compiles a less file
  • sass: Loads and compiles a scss file
  • stylus: Loads and compiles a stylus file


  • po: Loads a PO gettext file and returns JSON
  • mocha: Do tests with mocha in browser or node.js
  • eslint: PreLoader for linting code using ESLint.
  • jshint: PreLoader for linting code.
  • jscs: PreLoader for style checking.
  • injectable: Allow to inject dependencies into modules
  • transform: Use browserify transforms as loader.

For the full list of loaders, see list of loaders.

Module Format (AMD/CommonJS)

webpack supports bothAMD and CommonJS module styles. It performs clever static analysis on the AST of your code. It even has an evaluation engine to evaluate simple expressions. This allows you to support most existing librariesout of the box.

Code Splitting

webpack allows you to split your codebase into multiple chunks. Chunks are loaded asynchronously at runtime. This reduces the initial loading time.

Code Splitting documentation


webpack can do many optimizations to reduce the output size of your JavaScriptby deduplicating frequently used modules, minifying, and giving you full control of what is loaded initially and what is loaded at runtime through code splitting. It can also can make your code chunks cache friendlyby using hashes.

Optimization documentation

webpack optimizes in several ways. It also makes your chunks cache-friendlyby using hashes.

A small example of what's possible
// webpack is a module bundler.
// This means webpack takes modules with dependencies
// and emits static assets representing those modules.

// Dependencies can be written in CommonJs
var commonjs = require("./commonjs");
// or in AMD
define(["amd-module", "../file"], function (amdModule, file) {
    // while previous constructs are sync,
    // this is async
    require(["big-module/big/file"], function (big) {
         // For async dependencies, webpack splits
         // your application into multiple "chunks".
         // This part of your application is
         // loaded on demand (code-splitting).
        var stuff = require("../my/stuff");
        // "../my/stuff" is also loaded on-demand
        //  because it's in the callback function
        //  of the AMD require.

// "Loaders" are used to preprocess files.
// They can be prefixed in the require call
// or configured in the configuration.
// This does the same when you add ".coffee" to the extensions
// and configure the "coffee" loader for /\.coffee$/

function loadTemplate (name) {
    return require("./templates/" + name + ".jade");
    // Many expressions are supported in require calls.
    // A clever parser extracts information and concludes
    // that everything in "./templates" that matches
    // /\.jade$/ should be included in the bundle, as it
    // can be required.

// ...and you can combine everything.
function loadTemplateAsync (name, callback) {
    require(["bundle?lazy!./templates/" + name + ".jade"],
      function (templateBundle) {






You can run the Node tests with npm test.

You can run the browser tests:

cd test/browsertests
node build

and open tests.htmlin the browser.


Most of the time, if webpack is not working correctly for you it is a simple configuration issue.

If you are still having difficulty after looking over your configuration carefully, please post a question to StackOverflow with the webpack tag. Questions that include your webpack.config.js and relevant files are more likely to receive responses.

If you have discovered a bug or have a feature suggestion, feel free to create an issue on Github.

If you create a loader or plugin, please consider open sourcing it, putting it on NPM and following the x-loader, x-pluginconvention.

You are also welcome to correct any spelling mistakes or any language issues.

If you want to discuss something or just need help, here is our room.


Copyright (c) 2012-2015 Tobias Koppers


Thanks to

(In chronological order)

  • @google for Google Web Toolkit (GWT), which aims to compile Java to JavaScript. It features a similar Code Splittingas webpack.
  • @medikoo for modules-webmake, which is a similar project. webpack was born because I wanted Code Splitting for modules-webpack. Interestingly the Code Splitting issue is still open(thanks also to @Phoscur for the discussion).
  • @substack for browserify, which is a similar project and source for many ideas.
  • @jrburke for require.js, which is a similar project and source for many ideas.
  • @defunctzombie for the browser-field spec, which makes modules available for node.js, browserify and webpack.
  • Every early webpack user, which contributed to webpack by writing issues or PRs. You influenced the direction...
  • @shama, @jhnns and @sokra for maintaining this project
  • Everyone who has written a loader for webpack. You are the ecosystem...
  • Everyone I forgot to mention here, but also influenced webpack.


This is a free-time project. The time I invest in it fluctuates. If you use webpack for a serious task, and you'd like me to invest more time on it, please donate. This project increases your income/productivity too. It makes development and applications faster and it reduces the required bandwidth.

I'm very thankful for every dollar. If you leave your username or email, I may show my thanks by giving you extra support.






  • 面试官你来,130行带你手写完整Promise

    大家好,我是雷锋蜀黍。一直在某些面试宝典看到面试官要你手撸一个promise,今天天气这么好,不如我们来搞一搞。(PS:从未看过别人的实现,本文更像是记录一个思考的过程) 最终的代码完全符合Promi...

    2 个月前
  • 重温一下 JS 进阶需要掌握的 13 个概念

    作者:Nick Scialli 译者:前端小智 来源:hackernoon 阿里云服务器很便宜火爆,今年比去年便宜,10.24~11.11购买是1年86元,3年229元,可以点击 下面...

    7 个月前
  • 转行学前端的第 13 天 : 实现第一个页面效果

    我是小又又,住在武汉,做了两年新媒体,准备用 6 个月时间转行前端。 今日学习目标 按照昨天的规划,今天这边就需要从实例开始实战了,早上在创客贴上找了一个模板,今天主要就是将这个效果实现,加油,...

    1 个月前
  • 组织jQuery / JavaScript代码的最佳方法(2013)[已关闭]

    Damjan PavlicaKivylius(提出了一个问题:Best way to org...

    2 年前
  • 知晓推送正式上线!送你 13 亿条模板消息

    ( 「知晓推送(

    1 年前
  • 每日两道前端面试题 - 20190131

    IE和DOM 事件模型之间存在哪些主要差别 1 冒泡型事件 事件按照从最特定的事件目标到最不特定的事件目标(document对象)的顺序触发 IE 5.5 div body document...

    1 年前
  • 每天一点前端动画(2020-05-13)

    css3动画CSS 中的 transition 属性允许块级元素中的属性在指定的时间内平滑的改变语法如下: 具体的属性值: transitionproperty:规定设置过渡效果的 CSS ...

    21 天前
  • 染陌足迹——13届D2前端技术论坛

    水文预警!!多图预警!! 前一天刚参加完 See Conf 2019(

    1 年前
  • 整理总结:前端工程构建工具fis3篇

    FIS3 一个略微小众的被置弃维护了的前端工程构建工具,解决前端开发中自动化工具、性能优化、模块化框架、开发规范、代码部署、开发流程等问题。 在全民拥抱webpack的时代里,简单留个笔记 是爱过的印...

    2 个月前
  • 我的博客开发(013)

    上面的代码还是具有一个缺点:功能单一,无法统计某一天的阅读数; 效果如下: 6.png(/public/upload/10a127ec8d9b16398290bc77baf5ba6c) 需要一个专...

    2 个月前


扫码加入 JavaScript 社区