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Stoplight Prism

Stoplight Prism is a free, open-source command-line HTTP server for turning OpenAPI descriptions or Postman Collections into mock API servers.

Place
#17 of 43
Score
6.3
Stoplight Prism's website

What Stoplight Prism is

Stoplight Prism is a free, open-source command-line HTTP server for turning OpenAPI descriptions or Postman Collections into mock API servers. Teams can use a mock to explore an API before its backend exists, and Prism can produce dynamic examples based on the API description. It validates request and response data against that description. Its proxy mode can surface differences between an OpenAPI document and a target API, which is useful for checking consistency before production. The project lists support for OpenAPI 3.1, 3.0, and 2.0, along with Postman Collections, and supports OpenAPI v3.0 callbacks that deliver payloads to URLs. Prism can run independently or in continuous integration, including workflows where frontend and backend work proceeds in parallel. Installation options include npm, standalone binaries, Docker, and Docker Compose. The listed Node.js requirement is >= 18.20.1, or >= 18.16 for Node.js 18.x; a standalone binary or Docker image is also available. Prism uses the Apache-2.0 license. Stoplight offers hosted Prism-powered mock servers through Stoplight Platform and Stoplight Studio.

Good

  • Creates mocks from OpenAPI files and Postman Collections.
  • Validates request and response data.
  • Can run standalone or in continuous integration.
  • Install options include npm, binaries, and Docker.

Watch out

  • Requires Node.js >= 18.20.1, or >= 18.16 for Node.js 18.x.
  • Proxy mode requires an OpenAPI document and target API to compare.

Who it suits

Prism suits API developers who need mock servers or want to validate requests and responses against an API description. Its standalone and continuous-integration modes may fit teams coordinating frontend and backend work.

Verdict

Prism covers API mocking and validation in a free command-line tool, with multiple installation routes. Confirm the runtime requirement and specification support for your workflow.

Plans and prices

From Stoplight Prism's own pricing page, checked 8 Oct 2026.

All about pricing
PlanPriceWhat it gives you
Prism Open SourceFreeOpen-source HTTP server; requires Node.js >= 18.20.1 or a standalone binary; Docker image available

The facts

Each one read from Stoplight Prism's own pages, with the date it was checked.

What it does

Callbacks
Prism supports OpenAPI v3.0 callbacks for delivering payloads to URLs.checked 8 Oct 2026
Dynamic examples
It can generate dynamic, random examples based on an API description.checked 8 Oct 2026
Hosted option
Stoplight says hosted mock servers powered by Prism are available through Stoplight Platform and Stoplight Studio.checked 8 Oct 2026
Install options
The installation guide documents npm, standalone binaries, Docker, and Docker Compose installation options.checked 8 Oct 2026
License
The repository identifies its license as Apache-2.0.checked 8 Oct 2026
Mock servers
It generates mock servers from API specifications so teams can try an API before its backend is built.checked 8 Oct 2026
Run modes
Prism is an open-source command-line HTTP server that can run standalone or in continuous integration.checked 8 Oct 2026
Runtime requirement
The README lists Node.js >= 18.20.1 as a requirement, with >= 18.16 for Node.js 18.x.checked 8 Oct 2026
Specifications
The project README lists support for OpenAPI 3.1, 3.0, 2.0, and Postman Collections.checked 8 Oct 2026
Support
The repository points users to Stoplight documentation and its community for help.checked 8 Oct 2026
Use cases
The maker describes Prism as useful for parallel frontend and backend development and for checking API consistency in pre-production.checked 8 Oct 2026
Validation
Prism can validate request and response data against the API description.checked 8 Oct 2026
Validation proxy
Its proxy mode identifies discrepancies between an OpenAPI document and a target API.checked 8 Oct 2026
What it does
Prism turns OpenAPI or Postman Collection files into an HTTP API server for mocking, transformations, and validations.checked 8 Oct 2026

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