Create mock APIs in seconds

Mockoon is the easiest and quickest way to design and run mock REST APIs.
No remote deployment, no account required, free and open-source.

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Trusted by awesome teams at

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API mocking that saves you time

Get working mock REST APIs in seconds with an intuitive and easy-to-use interface.
Run them everywhere with the CLI.

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Integrates with your workflow

Compatible with the OpenAPI specification, Mockoon integrates perfectly with your existing applications and API design workflow.

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Complete tooling

Go beyond mocking with advanced features and tackle the most complex situation with HTTP requests recording, proxying, integration testing, etc.

AI powered

Instant prototyping

Effortlessly generate mock endpoints connected to realistic resources using our collection of ready-to-use templates and the power of our AI-assistant.

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Complete control

Mockoon offers you complete flexibility when creating your mocks: custom statuses, route and global headers, file serving or body editor, HTTPS, etc.

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Create realistic scenarios

Simulate real-life scenarios with dynamic templating and the response rules system. Test your app resilience with sequential and random responses.

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Powerful forwarding and debugging

Easily integrate Mockoon with existing backends and APIs by intercepting selected endpoints and forwarding the rest. Debug intricated situation with the built-in session recording.

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Run your mock servers anywhere

Use the CLI and the Docker image to run your mock REST APIs on servers and headless environments: GitHub Actions, CircleCI, TravisCI, etc.

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Serverless compatible

Deploy your mock REST APIs in cloud functions compatible with any provider: AWS Lambda, GCP Functions, Firebase Functions, etc.

Mockoon CLI start and list commands screenshot

Privacy friendly and offline first

Our tools are offline first and require no account creation. They are privacy-friendly, making them the best choice for highly regulated or high-security environments.

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Case studies

Discover how Mockoon's users improve their API design and development workflows with our fast and easy to use API tooling.

Uses Mockoon to conduct API UX research

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Uses API mocking to speed up application development and testing

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