Mockoon
A free, open-source desktop app and CLI for running mock APIs locally.
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About Mockoon
Mockoon is an open-source tool for creating mock APIs, which is often the other half of API testing: instead of sending requests to a real server, you stand up a fake one that answers the way you need. In the desktop app you define routes for GET, POST and other methods, return JSON or files with dynamic templating and Faker data, add rules, delays and error responses, proxy unknown routes to a real backend, import OpenAPI specs and record live traffic to generate mocks automatically. The CLI runs the same mocks headlessly in CI pipelines or Docker. It needs no account, keeps data on your machine and does not track your mock traffic. The app and CLI are free under the MIT licence for Mac, Windows and Linux; Mockoon Pro, a self-hosted paid service, adds team collaboration and data sync. The trade-offs are that it is a mocking tool, not a request client, and team features need the paid tier. It suits developers and testers who need reliable fake APIs.
Best for: Developers and testers who need local mock APIs for development and CI.
Pros and cons
What works
- Free, MIT licensed, no account
- Dynamic templating and Faker data
- CLI and Docker for CI
- Request recording to generate mocks
Why people leave
- Mocking only, not a request client
- Team sync needs paid Mockoon Pro
- Complex scenarios need templating knowledge
Top Mockoon alternatives
See all 5- 1
Apidog62.6Smart mocks generated from your API schema, plus testing.
- 2
Insomnia61.8Request client with cloud and self-hosted mock servers.
- 3
Postman58.3Built-in mock servers alongside a full request client.
- 4
Bruno57.5If you need a request client to pair with your mocks.
- 5
Karate57.2Open-source framework that includes mocks for test doubles.
Why people left Mockoon
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Mockoon: common questions
Is Mockoon free?
Yes. Mockoon is free, open-source software that you can host yourself.
Is Mockoon open source?
Yes. The source code is on GitHub at mockoon/mockoon. You can also run it on your own server.
What platforms does Mockoon run on?
Mockoon is available for macOS, Windows, Linux and Self-hosted.
What are the best alternatives to Mockoon?
The highest-ranked Mockoon alternatives right now are Apidog, Insomnia and Postman. See the full ranked list for pricing, platforms and verified facts.