Jest vs Mocha: Which Should You Choose?

A brief overview of two major testing frameworks and a little bonus called Enzyme


Jest is an open-source testing framework that has become increasingly popular recently. Developed by Facebook and built into the popular create-react-app package, Jest makes it faster and easier to write idiomatic JavaScript tests by having everything included. Jest comes with built-in mocking and assertion abilities. In addition, Jest runs your tests concurrently in parallel, providing a smoother, faster test run.


Mocha is one of the most flexible JavaScript testing libraries available. Mocha provides developers with a base test framework, allowing you to have options as to which assertion, mocking, and spy libraries you want to use. This does require some additional setup and configuration, which is a downside. However, if having complete control of your testing framework is something you want, Mocha is by far the most configurable and best choice.

Which should you choose?

Which framework will work best for you is entirely dependent on what your project demands. If you have a large project with the need for flexibility and customization then Mocha is probably the choice for you. If you have a smaller project and don’t need the extra setup and configuration up front, Jest is probably the better option. The choice is yours as to which framework is going to be the best solution for you and your team.

Bonus: Enzyme

Enzyme was developed by Airbnb for testing React components’ outputs. Enzyme shallow renders your components so that you ensure that your component is being passed the correct props and behaviors. Enzyme can be used in addition to any testing framework. Enzyme is easy to configure and has additional libraries for integration with popular libraries (like jest-enzyme and chai-enzyme).

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Katia Wheeler

Software Engineer 👩‍💻 Coffee enthusiast ☕ Gamer 👾 @KatiaKWheeler |