api-and-interface-design

Contract-first API design declares public interfaces and error semantics before implementation. Use it to design stable REST or GraphQL endpoints, module boundaries, and cross-team component interfaces that are hard to misuse.

Design standardized error handling by defining consistent error semantics across API boundaries. Apply these standardized error contracts to REST or GraphQL endpoints to ensure uniform validation and clear cross-team interface governance.

Establish module boundaries by defining contract-first interface designs that enforce input validation and additive changes. This approach ensures clear naming conventions and boundary governance across cross-team component interfaces.

The best way to version APIs is applying contract-first design with consistent naming conventions and additive changes. Documenting the interface ensures safe evolution and standardized validation at API boundaries.

Validate input at API boundaries by drafting a contract-first interface for your new service. Define public surfaces and error semantics upfront, then validate the implementation against this declared contract.

Yes, contract-first interface design works for both REST and GraphQL endpoints. It applies standardized error semantics, input validation, and boundary governance uniformly across different endpoint types and module boundaries.