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CI Ember Observer Score npm version

An Ember CLI addon to analyze the size and contents of your app's bundled output, using an interactive zoomable treemap.

View the interactive Demo

Screenshot of analyzer output

This helps you to

  • analyze which individual modules make it into your final bundle
  • find out how big each contained module is, including the raw source, minified and gzipped sizes
  • find modules that got there by mistake
  • optimize your bundle size

It uses broccoli-concat-analyser under the hood, which in turn was inspired by webpack-bundle-analyzer, and wraps it in Ember CLI addon to make it easy to use.


  • Ember.js v3.12 or above
  • Ember CLI v3.12 or above
  • Node.js v10 or above


ember install ember-cli-bundle-analyzer


After you have started your development server using ember serve, this addon adds a custom middleware listening to /_analyze. So just open http://localhost:4200/_analyze in your web browser to access the analyzer output.

While it processes the data, which can take a while due to live minification and compression of all involved modules, a loading screen is displayed. After processing has finished you should see the final output.

Live reloading is supported, so whenever you change a project file the output will be re-computed and updated.


You can customize the precessing by setting any of the following options into the 'bundle-analyzer' key of your ember-cli-build.js:

  • ignoreTestFiles (boolean): by default it will exclude all test files from the output. Set this to false to include them.

  • ignore (string | string[]): add files to ignore. Glob patterns are supported, e.g. *-fastboot.js.


See the Contributing guide for details.


This project is licensed under the MIT License.