Backend says “API is done,” frontend discovers a different response format, QA tests against outdated documentation. API-first development solves this.
Specification as an Artifact¶
First the OpenAPI specification, then the implementation. We generate server stubs (Spring), TypeScript clients, documentation (Redoc), and a mock server (Prism). Frontend can start working immediately against the mock.
Contract Testing¶
Schemathesis for property-based testing — generates requests from the specification and validates backend responses. It uncovered edge-case bugs that manual tests would have missed. Breaking changes block the merge.
Results¶
- API mismatch bugs: -90%
- Parallel development = faster delivery
- Documentation always up to date
API-First = Fewer Bugs, Faster Development¶
The investment in an upfront specification pays off many times over.
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