Open source
Mock Service Worker
API mocking library for browser and Node.js
Mocking TestingMock APIs at network level
4 tools in our directory are marked as best for Test engineers, from 3 sections: APIs (2), Mobile Development (1) and Testing & QA (1).

API mocking library for browser and Node.js

JavaScript library for controlling Chrome and Firefox from code

Cloud testing on real devices, browsers and emulators

Open source tool for simulating APIs in tests and development
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