Mock Service Worker
Simulate API responses so a frontend can be built and tested before a backend is ready.
What’s included for free?
The open-source mocking library runs in your browser or Node.js environment with no monthly mock-request allowance. You maintain mock data and supply the development runtime.
Provider information ↗Checked 2026-10-13
Before you use it
MIT licence; preserve the copyright and licence notice when distributing the software. Third-party dependencies and hosted services have their own terms.
Provider terms can change. Check current pricing and usage rights before starting a project.