Jan Giacomelli 6/2/2026

Prevent unintentional breaking API changes in FastAPI apps

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This article explains how to detect and prevent unintentional breaking changes in FastAPI applications by comparing OpenAPI schemas. It covers the importance of avoiding breaking changes like renaming response attributes, introduces the oasdiff tool for comparing OpenAPI specs, and provides a step-by-step guide to integrate it into GitHub Actions CI/CD. The post includes code examples for exporting OpenAPI schemas from different branches and running oasdiff to detect breaking changes automatically on pull requests.

Prevent unintentional breaking API changes in FastAPI apps

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