Drop your OpenAPI spec or Bruno collection and get a fully functional mock API server instantly. Export to Bruno API client or test directly — no account needed.
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Three steps to a working mock API
Upload or paste your OpenAPI/Swagger specification in JSON or YAML, or upload a Bruno collection (ZIP or JSON export).
We parse your spec and create a live mock API with realistic responses.
Use the mock URL in your frontend. Responses match your schema definitions.
Mock servers accelerate development by letting frontend and backend teams work in parallel.
Don't wait for your backend team to finish building APIs. Generate a mock API server from your OpenAPI spec and start integrating your frontend immediately. The mock server returns realistic responses based on your schema definitions, examples, and data types.
Run integration tests against a mock server instead of your production API. No risk of side effects, no rate limits to worry about, and consistent responses every time. Perfect for CI/CD pipelines and automated testing.
Build UI components against realistic API responses before the real API exists.
Validate your API design with stakeholders using a working mock before implementation.
Run automated tests against consistent mock responses without external dependencies.
Export your mock server as a Bruno collection with one click. Test every endpoint in Bruno instantly.
ApiNotes is the only mock server that exports directly to Bruno API client format. After generating your mock server, click “Export to Bruno” to download a complete Bruno collection with all endpoints pre-configured, including the mock server base URL, request headers, and example request bodies.
Bruno is an open-source, offline-first API client that stores collections in plain text files — perfect for version control. Unlike Postman, Bruno collections live in your Git repo. Combined with ApiNotes mock servers, you get a fully local, privacy-first testing workflow with no cloud lock-in.
Bruno runs locally without cloud accounts. Your API collections are plain files stored alongside your code.
Export mock endpoints as Bruno .bru files, commit them to your repo, and share with your entire team.
Bruno is a free, privacy-focused Postman alternative. ApiNotes + Bruno gives you mock testing without vendor lock-in.