api-contracts

To define stable API contracts, establish contract-first design by outlining REST endpoints, TypeScript interfaces, and cross-boundary data models before coding. This prevents downstream integration issues and minimizes breaking changes during refactoring.

Contract-first API design is the process of defining interfaces, data models, and standardized error semantics before writing code. You need it when adding new endpoints or refactoring responses to prevent brittle module boundaries and miscommunication.

Yes, contract-first design applies directly to cross-boundary data models across services. It enforces explicit boundary validation and consistent input/output shapes at REST API edges to prevent integration failures between separate services.

The best way to enforce boundary validation at REST API edges is by defining explicit API contracts upfront. This standardizes input and output shapes, ensuring consistent data validation and error handling semantics across all API surfaces.

You need standardized error semantics across API surfaces to prevent miscommunication and integration failures. Defining these error semantics within a stable API contract ensures downstream services handle REST endpoint errors predictably during refactoring.

To prevent breaking changes when refactoring REST endpoint responses, implement contract-first design with predefined API contracts. Using stable TypeScript interfaces and data models as a guide minimizes brittle module boundaries and downstream integration issues.