Ideas
apistestingdeveloper-toolsci-cd

Contract testing for APIs

Build a tool that automatically verifies API responses match the expected schema during development.

Why now

Teams waste days debugging issues caused by undocumented API behavior changes.

Who for
API developers
Business model
Team subscriptions
Effort
A few weeks

Developers write tests that pass against wrong assumptions about APIs. A tool could compare responses to OpenAPI specs and flag deviations early.

Integrate with CI/CD to catch breaking changes before staging. Sell to teams with public-facing APIs.

Start with Python/Node.js hooks validating common frameworks like FastAPI.

The risk is API gateways adding built-in contract testing.

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Contract testing for APIs — Ideas