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Prism vs json-server: catalog facts
Prism	json-server
Free Free and open source.	Free Free to install from npm.
Command line	Windows, macOS, Linux, Command line
Mock server generated directly from an OpenAPI file Validation proxy catches contract drift	Mock REST API from a single JSON file No code needed for basic use
Depends on a complete, accurate specification Command-line only	v1 is in beta and may bring breaking changes Requires Node.js and npm
Downloadable app	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.