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MockServer vs json-server: catalog facts
MockServer	json-server
Free Free and open source with no SaaS account needed.	Free Free to install from npm.
Self-hosted, Command line	Windows, macOS, Linux, Command line
Mocks and proxies HTTP up to HTTP/3 plus gRPC Records and replays real traffic	Mock REST API from a single JSON file No code needed for basic use
Aimed at developers and test setups rather than manual API exploration Configuration takes some learning for complex scenarios	v1 is in beta and may bring breaking changes Requires Node.js and npm
Downloadable app, Self-hosted	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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