api-and-interface-design

To design stable API interfaces, adopt a contract-first approach by defining input/output schemas and error semantics before implementation, clearly delineating responsibilities between modules and frontend-backend boundaries to prevent accidental misuse.

Establishing consistent error semantics requires defining uniform error shapes and status mappings across your REST and GraphQL boundaries, ensuring that public interfaces handle and return errors consistently during safe evolution.

Implement contract-first design by analyzing your API surface and drafting a minimal contract that captures endpoints, payloads, and error formats first, then implementing the backend logic strictly against that predefined contract.

You need type contracts when creating a new public API or module interface, ensuring that frontend-backend boundaries and inter-module dependencies are strictly defined and enforced to avoid accidental breaking changes during evolution.

Yes, you can analyze an existing API surface to draft a minimal contract-first design that captures current endpoints, payloads, and error formats, stabilizing the interface for future safe evolution.

Defining interface contracts before implementation prevents accidental breaking changes by enforcing a strict agreement on payloads and error semantics, allowing modules and teams to build against a stable, predictable public API.