jestjs.io JavaScript Testing Framework Open Source

Jest · 🃏 Delightful JavaScript Testing

Jest

Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more! Jest aims to work out of the box, config free, on most JavaScript projects.

TrustScore Level

Technology Software Development

Unique Visits

900000

30000 / day

Total Views

1500000

50000 / day

Visit Duration, avg.

00:05:30

3.5 page per visit

Bounce Rate

40%

Domain Rating
Domain Authority
Citation Level

Founded in

2011

Supported Languages

English, etc

Website Key Features

Zero Configuration

Jest aims to work out of the box, config free, on most JavaScript projects.

Fast and Safe

Jest parallelizes test runs across workers to maximize performance. It also ensures that tests are run in isolation and do not affect each other.

Snapshot Testing

Jest can capture snapshots of React trees or other serializable values to simplify UI testing.

Great API

Jest provides a comprehensive API for writing tests, including hooks for setup and teardown, mocking, and assertions.

Code Coverage

Jest can collect code coverage information from your tests without additional setup.

Mock Functions

Jest allows you to easily mock functions in your tests, making it simple to test complex interactions.

Interactive Watch Mode

Jest's watch mode automatically runs tests related to changed files, making development faster and more efficient.

Built-in Support for TypeScript

Jest has built-in support for TypeScript, allowing you to write tests in TypeScript without additional configuration.

Community and Plugins

Jest has a large and active community, with many plugins available to extend its functionality.

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Additional information

Maintainers

Jest is maintained by Facebook and a community of contributors.

License

Jest is open-source software licensed under the MIT License.

GitHub Repository

The source code for Jest is available on GitHub, where you can also contribute to its development.

Documentation

Comprehensive documentation is available on the Jest website, covering everything from getting started to advanced features.

Community Support

Jest has a vibrant community with forums, chat rooms, and social media channels where users can seek help and share knowledge.

HTTP headers

Security headers report is a very important part of user data protection. Learn more about http headers for jestjs.io