Heads Up! You're viewing the docs for v3.0, an old version of Karma. v6.4 is the newest.


Karma can be easily extended through plugins. In fact, all the existing preprocessors, reporters, browser launchers and frameworks are also plugins.

Installation #

Karma plugins are NPM modules, so the recommended way to install them are as project dependencies in your package.json:

  "devDependencies": {
    "karma": "~0.10",
    "karma-mocha": "~0.0.1",
    "karma-growl-reporter": "~0.0.1",
    "karma-firefox-launcher": "~0.0.1"

Therefore, a simple way to install a plugin is:

npm install karma-<plugin name> --save-dev

Loading Plugins #

By default, Karma loads all sibling NPM modules which have a name starting with karma-*.

You can also explicitly list plugins you want to load via the plugins configuration setting. The configuration value can either be a string (module name), which will be required by Karma, or an object (inlined plugin).

plugins: [
  // Karma will require() these plugins

  // inlined plugins
  {'framework:xyz': ['factory', factoryFn]},

There are already many existing plugins. Of course, you can write your own plugins too!