mswjs

Industry standard API mocking for JavaScript.

Data querying library for testing JavaScript applications.

Examples of Mock Service Worker usage with various frameworks and libraries.

Low-level network interception library.

Mock API requests in Storybook with Mock Service Worker.

Mock APIs in Playwright using Mock Service Worker.

Spawn an HTTP server from your request handlers or apply them to an existing server using a middleware.

A Fetch API "Headers" polyfill and transformation library.

Reliably determines if the code is running in Node.js. Treats Jest, React Native, Electron, and others like Node.js.

The "localStorage" polyfill for Node.js.