api-and-interface-design

To design a stable REST API, use contract-first interface definitions, enforce consistent error semantics, validate untrusted inputs at boundaries, and apply additive versioning practices to prevent breaking downstream consumers.

The best way to handle API error formats is to establish a single error shape with clear HTTP or status mapping, ensuring consumers can reliably parse and handle failures across all interface boundaries.

Contract-first typing improves interface design by specifying typed request and response models before implementation, ensuring predictable semantics and reducing integration friction between front-end and back-end systems.

You need boundary validation for untrusted API inputs at all entry points to enforce predictable contracts, reject malicious or malformed data early, and maintain stable module boundary behavior.

Yes, this approach applies to both GraphQL endpoint design and module boundary contracts, guiding predictable type safety, consistent error formats, and additive evolution without breaking existing usage.

For REST API list endpoints, follow additive versioning practices that include consistent pagination and naming conventions, allowing you to extend interfaces safely without breaking current consumer implementations.