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mswjs/msw

Industry standard API mocking for JavaScript.

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What it does

Mock Service Worker lets developers simulate fake versions of external services and APIs during development and testing, without changing any of their actual application code. It works by intercepting network requests in the browser or server, making it easy to build and test apps even when the real backend isn't ready or available.

Why it matters

Teams that can build and test features independently of backend readiness ship faster and with fewer bugs — this tool directly reduces the cost and delay of cross-team dependencies. With nearly 18,000 stars and an endorsement from one of the most influential voices in web development, MSW has become the default choice for API mocking, signaling strong developer adoption and long-term staying power.

0Active

On the radar — signal detected

Stars
18.0k
Forks
612
Contributors
181
Language
TypeScript

Score updated May 8, 2026

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