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json-serverMockServer
Free

Free to install from npm.

 Free

Free and open source with no SaaS account needed.

Windows, macOS, Linux, Command line Self-hosted, Command line
  • Mock REST API from a single JSON file
  • No code needed for basic use
  • Mocks and proxies HTTP up to HTTP/3 plus gRPC
  • Records and replays real traffic
  • v1 is in beta and may bring breaking changes
  • Requires Node.js and npm
  • Aimed at developers and test setups rather than manual API exploration
  • Configuration takes some learning for complex scenarios
Downloadable app Downloadable app, Self-hosted
Closed source Open source
License not stated License not stated
No account needed No account needed
Works offline Works offline

Checked September 24, 2026

Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.