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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 . There are also npm based CDNs one can use.


See the sinon project homepage for documentation on usage.

If you have questions that are not covered by the documentation, you can check out the sinontag on Stack Overflow or drop by #sinon.js on .

You can also search through the Sinon.JS mailing list archives .


  • 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


SeeCONTRIBUTING.mdfor details on how you can contribute to Sinon.JS


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Sinon.js was released under BSD-3