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