API Testing (atest)

Open-source API testing and mock server tool for HTTP, gRPC, and tRPC with multiple storage backends.

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atest (API Testing) is a free, open-source tool for debugging and testing HTTP, gRPC, and tRPC APIs, with a built-in mock server and support for JMeter conversion, JSON schema validation, and Markdown/HTML/PDF reports. It supports multiple storage backends and can run as a CLI, container, Kubernetes Operator, or Helm chart, with a VS Code extension available. Aimed at backend developers and QA engineers who need flexible, self-hosted API testing.

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