Prism

Turn any OpenAPI or Postman Collection file into a mock API server with validation, in one CLI command.

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A command-line tool that turns an OpenAPI v2/v3 spec or Postman Collection into a runnable mock API server with request validation and content negotiation. It provides a spec-accurate mock for frontend developers, API consumers, and QA teams to use in development and CI before a backend exists, and is self-hosted and open-source under a permissive license with an optional hosted mock service available.

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Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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