api-and-interface-design

To design a stable REST API, use a contract-first approach by defining types and specs before implementation, enforce additive backward-compatible changes, and avoid renaming or changing field types to minimize accidental coupling.

Contract-first API design makes interfaces and types the source of truth by defining specifications before implementation. Use it when creating or changing public surfaces like REST and GraphQL endpoints to prevent fragile, inconsistent behaviors.

Standardize error handling by defining consistent error shapes and status codes across your GraphQL or REST API. Validate inputs strictly at system boundaries to ensure predictable behavior and prevent leaked implementation details.

Yes, this interface design approach applies to GraphQL endpoints, REST APIs, module boundaries, component props, and internal service contracts, ensuring predictable naming conventions and consistent pagination across all public surfaces.

Reduce accidental coupling in public interfaces by applying Hyrum-aware design, which limits observable behaviors and plans deliberate deprecation paths. This prevents users from unintentionally relying on leaked implementation details.