Load Bootstrap styles and scripts in your Webpack bundle
JavaScript Shell
Latest commit e65d850 Jan 10, 2017 @justin808 justin808 Release 2.0.0-beta.19


Build Status npm version

Aloha from Justin Gordon and the ShakaCode Team! We need your help. Venture capital funding has slowed and, for the first time, my ShakaCode team is actively looking for our next project. If you like bootstrap-loader or React on Rails, please consider contacting me if we could potentially help you in any way. I'm offering a free half hour project consultation, on anything from React on Rails to any aspect of web application development, including both consumer and enterprise products. You can read more about my background here. Whether you have a new project, or need help on an existing project, please email me directly at justin@shakacode.com. And thanks in advance for any referrals! Your support keeps this project going. See our blog post Can ShakaCode Help You? for more information on what we offer.

Follow @ShakaCode for notications of new releases. And thanks for staring the project! We appreciate it!

boostrap-loader v2 Docs!

If you want the v1 docs which are compatible with Webpack v1, please see the v1 branch.


Successor to bootstrap-sass-loader. Load Bootstrap styles and scripts in your Webpack bundle. This loader uses SASS to process CSS styles. Bootstrap 3 & 4 are supported.

NOTE: Bootstrap 4, (twbs/bootstrap)[https://github.com/twbs/bootstrap] is currently in alpha right now. Bootstrap 4 definitely worked when we first released this package. The parent company of this product, ShakaCode had originally planned to use it for our upcoming commercial product, but we decided that Bootstrap 4 was changing too fast for a production product. Thus, we're still using Bootstrap 3, and we're not actively developing with Bootstrap 4. Consequently, for Bootstrap 4 issues, we need one of:

  1. Community support to help us with Bootstrap 4 issues and pull requests.
  2. We'd be thrilled to have another maintainer join us to help with Bootstrap 4 issues.
  3. We'd also be thrilled if any companies are open to sponsoring the development of features and issues regarding Bootstrap 4.

That being said, Bootstrap 4 probably works just fine! You must use 4.0.0-alpha.4 or greater.


2016-10-30: Released 1.3.0. Supports multiple config files in one build.

2016-10-02: Released 2.0.0-beta.12. Supports isomorphic-style-loader and disabling SASS source map and/or resolve-url-loader injection!

2016-09-10: Released 2.0.0-beta.11 with support for Bootstrap 4, alpha 4!

2016-08-02: Released 2.0.0-beta Updated to support Webpack 2.1 beta and Webpack ExtractTextPlugin 2.0 beta!

2016-08-01: Released 1.1.0. Supports custom bootstraprc location.

Table of Contents


Get it via npm:

npm install bootstrap-loader

Don't forget to install these dependencies (use --save or --save-dev option per your needs to update your package.json):

# Bootstrap 3
npm install --save-dev bootstrap-sass

# or Bootstrap 4
npm install --save-dev bootstrap@v4.0.0-alpha.4

# Note, alpha.3 is broken, and alpha.2 is no longer supported

# Node SASS & other loaders needed to handle styles
npm install --save-dev css-loader node-sass resolve-url-loader sass-loader style-loader url-loader

# Additional loaders required for Bootstrap 4 & Webpack 2
npm install --save-dev imports-loader exports-loader

If you're using Bootstrap 4, you probably need:

npm install --save-dev postcss-loader


Simply require it:


Or add bootstrap-loader as a module in an entry point in your webpack config (you'll need Webpack 2.1 beta and higher):

entry: [ 'bootstrap-loader', './app' ]

Config is optional. If used, by default it should be placed in your project's root dir with name .bootstraprc. You can write it in YAML or JSON formats. Take a look at the default config files for Bootstrap 3 and Bootstrap 4. Note, we recommend using a configuration or else you might pick up unwanted upgrades, such as when we make Bootstrap 4 the default. Config options don't fall back on the defaults once a config file is present. Be sure not to delete config options. To start with a custom config, copy over a default config file as a starting point.

If the default location doesn't work for you (e.g. you want to create multiple bootstrap configs for branding variations or you symlink your npm_modules directory), you may pass the absolute path of the .bootstraprc file to the loader in your webpack config, e.g. bootstrap-loader/lib/bootstrap.loader?extractStyles&configFilePath=${__dirname}/.bootstraprc!bootstrap-loader/no-op.js.

Note that :__dirname is a global variable that Node sets for us. It is "the name of the directory that the currently executing script resides in."

# You can use comments here
useFlexbox: true

  - style-loader
  - css-loader
  - sass-loader

  normalize: true
  print: true

  alert: true
  button: true
  // And JSON comments also!
  "useFlexbox": true,

  "styleLoaders": ["style-loader", "css-loader", "sass-loader"],

  "styles": {
    "normalize": true,
    "print": true

  "scripts": {
    "alert": true,
    "button": true

If no config provided, default one for Bootstrap 3 will be used.

Bootstrap 4 internal dependency solution

Because of Bootstrap 4's removal of UMD, internal dependencies, such as Popover's dependencies on Tooltip and Dropdown's dependency on Utils, are no longer naively resolved by Webpack (See Issue #172. In order to solve this issue, add the following code to your webpack configuration:

plugins: [
  new webpack.ProvidePlugin({
    $: "jquery",
    jQuery: "jquery",
    "window.jQuery": "jquery",
    Tether: "tether",
    "window.Tether": "tether",
    Alert: "exports-loader?Alert!bootstrap/js/dist/alert",
    Button: "exports-loader?Button!bootstrap/js/dist/button",
    Carousel: "exports-loader?Carousel!bootstrap/js/dist/carousel",
    Collapse: "exports-loader?Collapse!bootstrap/js/dist/collapse",
    Dropdown: "exports-loader?Dropdown!bootstrap/js/dist/dropdown",
    Modal: "exports-loader?Modal!bootstrap/js/dist/modal",
    Popover: "exports-loader?Popover!bootstrap/js/dist/popover",
    Scrollspy: "exports-loader?Scrollspy!bootstrap/js/dist/scrollspy",
    Tab: "exports-loader?Tab!bootstrap/js/dist/tab",
    Tooltip: "exports-loader?Tooltip!bootstrap/js/dist/tooltip",
    Util: "exports-loader?Util!bootstrap/js/dist/util",


Check out example apps in examples/ folder:

  • Basic usage: examples/basic
    • See the npm run bs4:customlocation tasks for examples on how to pass your .bootstraprc config.
  • With CSS Modules: examples/css-modules (This example shows off hot reloading with Babel 6 as well!)
  • With multiple entries examples/multiple-entries with their own config.

Common configuration options

Here are common options for Bootstrap 3 & 4.

Bootstrap 3 & 4


Default: disabled

Outputs debugging info. Set this option to debug to output debugging information. This is critical for debugging issues. The output will go to your webpack console.

loglevel: debug


Default: 3

Major version of Bootstrap. Can be 3 or 4.

bootstrapVersion: 3


Default: [ 'style-loader', 'css-loader', 'sass-loader' ]

Array of webpack loaders. sass-loader is required, order matters. In most cases the style loader should definitely go first and the sass loader should be last.

Note: Beginning with Webpack v2.1.0-beta.26, the '-loader' suffix is required for all loaders. To maintain compatibility with older versions, all accepted style loaders (style, css, postcss, sass, resolve-url) are automatically appended with '-loader'. It is recommended that you explicitly state the '-loader' suffix for every webpack loader in styleLoaders to ensure compatibility in the long term.

  - style-loader
  - css-loader
  - sass-loader

# You can apply loader params here:
  - sass-loader?outputStyle=expanded

Different settings for different environments can be used.

# It depends on value of NODE_ENV environment variable
      - style-loader
      - css-loader
      - resolve-url-loader
      - sass-loader
      - style-loader
      - css-loader
      - sass-loader


Default: false

Extract styles to stand-alone css file using extract-text-webpack-plugin version 2.0.0-beta or higher. See extract-text-plugin for more details.

extractStyles: false

# Different settings for different environments can be used,
# It depends on value of NODE_ENV environment variable
    extractStyles: false
    extractStyles: true

This param can also be set to true in webpack config:

entry: [ 'bootstrap-loader/extractStyles', './app' ]

See shakacode/react-webpack-rails-tutorial/blob/master/client/webpack.client.rails.build.config. for a working example which is deployed to www.reactrails.com.


Default: disabled

Customize Bootstrap variables that get imported before the original Bootstrap variables. Thus, derived Bootstrap variables can depend on values from here. See the Bootstrap _variables.scss file for examples of derived Bootstrap variables.

preBootstrapCustomizations: ./path/to/bootstrap/pre-customizations.scss


Default: disabled

This gets loaded after bootstrap variables is loaded. Thus, you may customize Bootstrap variables based on the values established in the Bootstrap _variables.scss file. Note, if bootstrap did not have derived values, it would not be necessary to have two config files for customizing bootstrap values.

If you want your bootstrap override value to apply to derived variable values, then place your customizations in preBootstrapCustomizations. If you want to be sure your changes don't affect other derived values, place the changes in bootstrapCustomizations.

If you are not sure, you can probably simply use preBootstrapCustomizations and, if you have issues, see _variables.scss for derived values.

bootstrapCustomizations: ./path/to/bootstrap/customizations.scss


Default: disabled

Import your custom styles here. Usually this endpoint-file contains list of @imports of your application styles.

appStyles: ./path/to/your/app/styles/endpoint.scss


Default: all

Bootstrap styles.

  mixins: true
  normalize: true

# or enable/disable all of them:
styles: true / false


Default: all

Bootstrap scripts.

  transition: true
  alert: true

# or enable/disable all of them:
scripts: true / false


Default: false

If you're using a custom icon font and you need to specify its path ($icon-font-path) in your Sass files, set this option to true.

useCustomIconFontPath: true / false
$icon-font-path: ../fonts // relative to your Sass file
$icon-font-name: 'glyphicons' // you'll typically want to change this too.

Bootstrap 4 only

There is only one additional option for Bootstrap 4:


Default: true

Enable / disable flexbox model.

useFlexbox: true


Additionally, Bootstrap 4 requires Tether. You can add Tether per the examples in the /examples directory.

  1. Add tether to package.json: npm i --save tether
  2. Add tether as an entry point to your webpack config.
  3. Add this plugin to your webpack config:
  plugins: [
    new ExtractTextPlugin('app.css', { allChunks: true }),
    new webpack.ProvidePlugin({
      "window.Tether": "tether"


Bootstrap 4 seems to require postcss:

  1. Add postcss and the the postcss-loader: npm i --save postcss postcss-loader
  2. Put postcss before sass in the order of loaders in your .bootstraprc file.

Glyphicon alternatives

Glyphicons have been removed from Bootstrap 4. The examples demonstrate how to use the font-awesome-loader

Additional configurations

Paths to custom assets

If you use bootstrap-loader to load your styles (via preBootstrapCustomizations, bootstrapCustomizations & appStyles) and you load custom assets (fonts, images etc.), then you can use relative paths inside url method (relative to SASS file, from which you load asset).

This was made possible thanks to resolve-url-loader. In common case you don't have to do anything special to apply it — we are doing it internally (just don't forget to install it). But if you want to use its custom settings, please provide it explicitly via styleLoaders option in .bootstraprc:

  - style-loader
  - css-loader?sourceMap
  - resolve-url-loader?sourceMap
  - sass-loader?sourceMap

Incorporating Bootswatch themes

The following steps are needed to successfully incorporate a theme from Bootswatch:

  1. Download the .scss files (_variables.scss and _bootswatch.scss) for the theme you have chosen.
  2. Put the files somewhere in your project structure (e.g. the ./styles directory).
  3. Add an additional SCSS file, like bs-theme.scss, that contains the following:

    @import './_bootswatch.scss';
  4. Add the following to your .bootstraprc file:

    preBootstrapCustomizations: ./styles/_variables.scss
    appStyles: ./styles/bs-theme.scss

    The theme should now be applied as expected. Note that this section might be valid for other theme packs as well.


If you want to use Bootstrap's JS scripts — you have to provide jQuery to Bootstrap JS modules using imports-loader. To avoid having to include jQuery in your project you can disable all scripts (see scripts).

module: {
  loaders: [
    // Use one of these to serve jQuery for Bootstrap scripts:

    // Bootstrap 3
    { test:/bootstrap-sass[\/\\]assets[\/\\]javascripts[\/\\]/, loader: 'imports-loader?jQuery=jquery' },

    // Bootstrap 4
    { test: /bootstrap[\/\\]dist[\/\\]js[\/\\]umd[\/\\]/, loader: 'imports-loader?jQuery=jquery' },

Note: if you're not concerned about Windows, the lines look like this (simpler regexp pattern):

// Boostrap 3
{ test: /bootstrap-sass\/assets\/javascripts\//, loader: 'imports-loader?jQuery=jquery' },

// Bootstrap 4
{ test: /bootstrap\/dist\/js\/umd\//, loader: 'imports-loader?jQuery=jquery' },

Icon fonts

Bootstrap uses icon fonts. If you want to load them, don't forget to setup url-loader or file-loader in webpack config:

module: {
  loaders: [
    { test: /\.(woff2?|svg)$/, loader: 'url-loader?limit=10000' },
    { test: /\.(ttf|eot)$/, loader: 'file-loader' },


Using Bootstrap mixins and variables

You should use sass-resources-loader in your webpack config.

In your webpack.config.js:

module.exports = {

  // stuff removed for clarity ...

  module: {
    loaders: [
      // stuff removed for clarity ...
        test: /\.scss$/,
        loader: ExtractTextPlugin.extract(
          'css-loader?modules&importLoaders=2&localIdentName=[name]__[local]__[hash:base64:5]' +
          '!sass-loader' +
      // stuff removed for clarity ...

  // stuff removed for clarity ...

  sassResources: './config/sass-resources.scss',

And in your ./config/sass-resources.scss:

// Make variables and mixins available when using CSS modules.
@import "node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_variables";
@import "node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_mixins";

You can then use mixins and variables from Bootstrap in your own code.


See Contributing to get started.



Examples and related libraries

Useful Q&A

We'll identify issues that are questions.