Mockoon screenshot with people working

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.

Download Mockoon

or choco install mockoon
or sudo snap install mockoon
yay -S mockoon-bin
or brew install --cask mockoon
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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.


Complete control

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

Mockoon customizable interface screenshot with multiple features displayed

Create realistic scenarios

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

Mockoon main interface screenshot with response rules and templating system

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.

Mockoon requests recording screenshot

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.

Mockoon CLI start and list commands screenshot

Case studies

API UX research with Mockoon

Learn how Impala uses Mockoon to conduct API user research

Read more