api-and-interface-design

Design a stable REST API and module boundaries by applying contract-first design, the One-Version Rule, and Hyrum's Law to ensure interface clarity and consistency across all system components.

Hyrum's Law states that when an API has enough users, all observable behaviors become implicitly relied upon. It impacts public interface design by enforcing strict module boundaries to prevent unintended breaking changes.

Standardize GraphQL schema error responses by defining consistent error semantics and implementing strict input and output validation practices across all endpoints to prevent client miscommunication.

Yes, you can establish API endpoints in a monorepo by defining strict module boundaries and applying the One-Version Rule to maintain interface consistency and prevent dependency conflicts across components.

The best way to create contract-first API documentation is to define endpoints and error semantics upfront, then enforce validation practices to ensure the public interface documentation matches actual code behavior.

You should avoid contract-first API design when building rapid prototypes or highly experimental features where interface stability is unnecessary, as enforcing strict module boundaries prematurely adds overhead.