Jest is a JavaScript testing framework designed to ensure correctness of any JavaScript codebase. It allows you to write tests with an approachable, familiar and feature-rich API that …

Jest can be used in projects that use webpack to manage assets, styles, and compilation. webpack does offer some unique challenges over other tools. Refer to the webpack guide to …

Development of Jest happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in …

Jun 4, 2025 · Today we are happy to announce the release of Jest 30. This release features a substantial number of changes, fixes, and improvements. While it is one of the largest major …

Consult the Getting Started guide for details on how to setup Jest with TypeScript. Runs a function after all the tests in this file have completed. If the function returns a promise or is a …

The jest command line runner has a number of useful options. You can run jest --help to view all available options. Many of the options shown below can also be used together to run tests …

Start using jest in your project by running `npm i jest`. There are 13129 other projects in the npm registry using jest.

Jest runs the code of your project as JavaScript, hence a transformer is needed if you use some syntax not supported by Node out of the box (such as JSX, TypeScript, Vue templates).

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At Facebook, we use Jest to test React applications. If you are new to React, we recommend using Create React App. It is ready to use and ships with Jest! You will only need to add react …

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Jest can be used in projects that use webpack to manage assets, styles, and compilation. webpack does offer some unique challenges over other tools. Refer to the webpack guide to …

Apr 23, 2025 · In this post, we’ll discuss Jest testing including a thorough definition followed by a practical, hands-on tutorial to get started.

6 days ago · Jest is a widely adopted JavaScript testing framework developed by Meta. It’s primarily used for unit testing in React applications but also supports full-stack testing across …

Jest is used by Facebook to test all JavaScript code including React applications. One of Jest's philosophies is to provide an integrated "zero-configuration" experience.

Today we are happy to announce the release of Jest 30. This release features a substantial number of changes, fixes, and improvements. While it is one of the largest major releases of …

Delightful JavaScript Testing Framework with a focus on simplicity. - Jest.

Install Jest using yarn: Or npm: Note: Jest documentation uses yarn commands, but npm will also work. You can compare yarn and npm commands in the yarn docs, here. Let's get started by …

Jest is used by Facebook to test all JavaScript code including React applications. One of Jest's philosophies is to provide an integrated “zero-configuration” experience.