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Standalone and test framework agnostic JavaScript test spies, stubs and mocks (pronounced "sigh-non", named after Sinon, the warrior).

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via npm

$ npm install sinon

or via sinon's browser builds available for download on the homepage.


See the sinon project homepage for documentation on usage.

If you have questions that are not covered by the documentation, please post them to the Sinon.JS mailing list or drop by #sinon.js on or the Gitter channel.

Important: Sinon v1.x does not work with AMD/CommonJS Bundlers!

Sinon.JS v1.x as source doesn't work with AMD loaders / RequireJS / Webpack / Browserify. For that you will have to use a pre-built version. You can either build it yourself or get a numbered version from

This has been resolved in Sinon v2.x; Please don't report this as a bug.


  • No global pollution
  • Easy to use
  • Require minimal “integration”
  • Easy to embed seamlessly with any testing framework
  • Easily fake any interface
  • Ship with ready-to-use fakes for XMLHttpRequest, timers and more


See for details on how you can contribute to Sinon.JS


Support us with a monthly donation and help us continue our activities. [Become a backer]


Become a sponsor and get your logo on our README on Github with a link to your site. [Become a sponsor]


Sinon.js was released under BSD-3