Keploy Auto-Generates API Test Mocks From Live Traffic to Simplify Integration Testing

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Writing mocks and integration tests for microservices is often slow and brittle, especially when services depend on databases or third-party APIs. Keploy is an open-source tool that records real API calls and converts them into reusable test cases and data mocks. It intercepts network and database interactions using eBPF and network proxies, without requiring changes to the application code. The recorded interactions are saved as YAML files that can be version-controlled alongside the codebase and replayed to detect regressions. The author argues this approach reduces boilerplate work, makes CI pipelines more reliable, and gives teams a safety net when refactoring legacy code.

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