MockBase is a hosted API mocking tool. With a single click, you can get a live HTTPS endpoint to use with a frontend, mobile app, or CI pipeline, even before the real backend exists. Each mock supports multiple routes, each having its own status code, response body, and optional delay.
MockBase goes beyond static responses. Routes can match differently based on query params, headers, or JSON body fields. Responses can be rendered as sandboxed Jinja2 templates that echo back request data or generate fresh UUIDs and timestamps. The tool can behave like a real resource collection with full CRUD (create, read, update, delete) backed by server-side state, instead of returning the same static body every time.
MockBase can also inject random failures at a configurable rate to test retry logic and error handling before it hits production. It can proxy and record real API traffic for requests that don't match a configured route, turning captured exchanges into permanent routes with one click.
Every request to a mock streams live into a WebSocket-based request inspector. This feature allows you to check the method, path, headers, body, latency, and client IP, so you can confirm your app is calling what you think it's calling.
Mocks can be created without an account (1 mock, 4 routes) or imported directly from an existing OpenAPI 3.x spec. Signed-in accounts get unlimited mocks and routes, plus custom subdomains, token-protected endpoints, and a higher request quota. All these features are free during the current beta.
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