api-contract-testing

Contract testing validates API contracts between consumers and providers to prevent breaking changes. It verifies consumer expectations against provider schemas in CI, catching incompatibilities early across service boundaries with deterministic test execution.

Consumer-driven contract testing validates API contracts where consumers define expectations that providers verify. You need it in microservice ecosystems to prevent integration breaks from uncoordinated API changes across independently deployed services.

Yes, you can validate OpenAPI and Swagger specifications against JSON Schema across service boundaries. This skill performs schema validation to ensure structural compatibility and prevent contract drift between interacting services.

Run a Pact-based contract test suite in CI to verify provider changes do not break consumer expectations. The skill applies consumer-driven contract workflows, executing deterministic tests that check provider compatibility across versions and schemas.

Yes, contract testing works for both schema validation and version compatibility. It supports OpenAPI/Swagger validation, JSON Schema checks, and Pact-based testing to verify consumer-provider compatibility across versions and schemas.

Contract drift breaks microservice integrations because services evolve independently, causing uncoordinated schema or endpoint changes. Continuous API contract validation catches these breaking changes early in CI before they impact downstream consumers.