api-and-interface-design

To design stable REST APIs and GraphQL schemas, define the interface contract first to establish a single source of truth, ensuring predictable observable behavior for consumers and preventing accidental regressions.

The best way to handle API validation boundaries is to validate untrusted third-party responses at system edges and enforce a single error schema to maintain consistent error semantics across services.

Avoid Hyrum's Law traps and versioning chaos by enforcing careful contracts, naming conventions, and additive extension strategies that keep public module boundaries and component props predictable.

Yes, you can review pagination, filtering, and PATCH semantics before implementation by verifying design expectations against established naming conventions and contract principles to flag inconsistencies early.

Yes, contract-first design works for external REST endpoints, GraphQL schemas, and internal module boundaries by treating the interface spec as the single source of truth for all consumers.

Relying on observable behavior for API versioning risks accidental regressions when users depend on undocumented behavior, making strict contract enforcement and additive extension strategies necessary to prevent breaking changes.