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Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.

Which is more popular?
Based on our record, Chai should be more popular than JavaScript Operator Lookup. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | joshwcomeau.com | chaijs.com |
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Recommended for
Developers working with JavaScript or Node.js who require a versatile and easy-to-use assertion library. It's particularly beneficial for those utilizing frameworks like Mocha or Jasmine and those who appreciate a choice between BDD and TDD styles in their testing approach.
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Chai Review - with Liz Boccolini
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Recommendations tracked on public social media and blogs since March 2021.


If you replace your || with ?? You should get the behaviour you are after. This is a good reference for what the operators do in js: https://joshwcomeau.com/operator-lookup. Source: about 5 years ago
Mocha as the test runner, Chai as the assertion library, and the Hardhat Chai Matchers to extend Chai with contracts-related functionality. - Source: dev.to / about 4 years ago
Assertion library we used: Chai (comes with a lot of plugins worth exploring). - Source: dev.to / over 4 years ago
While this is fine and I could have perfectly moved all my tests to use said assertion style, I like the descriptive way Jest tests look like. As a quick way to maintain certain similarity I reached for ChaiJS, an assertion library that... - Source: dev.to / over 4 years ago
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