mswjs

The industry standard for API mocking in JavaScript.

Data querying library for testing JavaScript applications.

Mock Service Worker usage examples.

Low-level network interception library for Node.js.

Mock API requests in Storybook with Mock Service Worker.

Mock APIs in Playwright using Mock Service Worker.

Generate MSW request handlers from various sources (HAR files, OpenAPI documents, etc).

Official website and documentation for the Mock Service Worker library.

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

Develop and test Cloudflare applications with Mock Service Worker.

A superset of the JSDOM environment for Jest that respects Node.js globals.