Mockoon

Mockoon is a free and open source desktop application allowing to quickly mock servers and APIs. It packs some great features:

• Unlimited mocking: Create an unlimited number of mock API with unlimited number of routes and run them in parallel.
• Import / export: Mock API import / export with Swagger/OpenAPI format support.
• Route regex: Route regex supported (/.*, /[a-z]{3}, ...), based on ExpressJS syntax.
• Multiple responses per route: Serve multiple rules-triggered responses for each route with any headers body, or HTTP status codes.
• CORS: Automatically send CORS headers (Access-Control-Allow-Origin, etc.) for OPTIONS requests.
• HTTPS: Serve your mock API over TLS with self-signed certificate.
• Response headers: Add any response headers to your routes and mock API. With auto-completion.
• Latency: Add latency at environment or route level or even both.
• Requests and responses logs: All incoming requests and outgoing responses are logged for easier debugging.
• Proxy mode: Redirect all non-defined routes to the specified host with Mockoon's proxy mode.
• File serving: File serving with automatic mime type detection and templating support.
• Rich text editor: Rich text editor for body content supporting multiple languages (JSON, HTML, etc).
• Templating: Templating supported in body, file content and header, with many helpers: url params, query params, JSON body lookup, etc.
• Auto-save: Real-time auto save as you type. Never worry again about saving!
• Offline: No account, no sign-up, no cloud deployment required.