Mock Service Worker

API mocking for browser and Node.js

⭐ 4.6/5 (5200 reviews)

About Mock Service Worker

MSW (Mock Service Worker) intercepts requests at the network level for seamless API mocking in tests and development.

Key Features

  • Network-level mocking
  • Browser & Node
  • TypeScript
  • REST & GraphQL
  • DevTools
  • Handlers

✅ Pros

  • Network-level
  • Same mocks for tests & dev
  • TypeScript native
  • REST & GraphQL

❌ Cons

  • Learning curve
  • Service worker limitations
  • Debugging
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