interface-contract-design

API interface contracts define precise input/output fields, types, constraints, and examples for endpoints to align upstream and downstream teams. They apply to REST/gRPC boundaries and service interfaces to prevent integration pitfalls and ensure stable consumer expectations.

API versioning maintains backward compatibility by defining explicit versioning rules and error taxonomies within interface contracts. Apply these rules to service boundaries and cross-team interfaces to ensure stable contracts without breaking existing consumers during updates.

Contract-driven tests for REST and gRPC boundaries are created by defining integration test scenarios derived from explicit input/output contracts. Specify precise fields, types, and error taxonomies to guide implementation and validate that upstream and downstream teams meet expectations.

Interface contract design works for microservice interfaces and cross-team collaboration by standardizing how teams specify API boundaries. It eliminates ambiguity by defining explicit contracts, error taxonomies, and backward-compatible versioning for stable integration.

An error taxonomy in an API specification categorizes explicit error responses within interface contracts to align upstream and downstream teams. It prevents integration issues by ensuring consumers understand failure modes and can handle errors predictably across service boundaries.