MSW vs Sinon.js: licensing, GitHub activity, and what each is actually for. Neutral comparison, no paid rankings.
MSW: Open source. 18,280 GitHub stars. Mock Service Worker - API mocking library using Service Worker API for seamless request interception in browser and Node.js.
Sinon.js: Open source. 9,754 GitHub stars. Standalone test spies, stubs, and mocks for JavaScript. Works with any unit testing framework.