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Frontend, mobile, backend, and QA developers can use Mockfly to build and test against an API before the real service is ready. Create hosted REST or WebSocket endpoints in a browser, or import an OpenAPI specification or Postman collection, then point an app or test suite at the mock API URL. Define responses in JSON, XML, or file format, and configure multiple outcomes for an endpoint. Rules can select a response based on request details such as query parameters, headers, or body content, letting teams test success and error cases, loading delays, and other scenarios. Faker.js placeholders and AI-generated JSON help create sample data without writing every value by hand. Teams can share projects and automatically generated API documentation. Mockfly also includes a Chrome extension that captures real browser requests and adds selected endpoints to a project, plus request logs for inspecting traffic and a version history with diffs for reviewing endpoint changes. It is suited to teams developing frontend or mobile features in parallel with backend work, and to testing integrations or edge cases without relying on a live service.
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