api-and-interface-design

Contract-first API design defines stable interface contracts before implementation, ensuring modules adhere to agreed types and validation rules. This approach reduces complexity and prevents misuse by enforcing consistent behavior across components throughout the software lifecycle.

To design a hard-to-misuse REST API, define clear interface contracts, enforce validation at boundaries, and evolve the public interface additively. This ensures stable endpoints, prevents breaking changes, and maintains consistent behavior across distributed components.

Defining type contracts between modules requires establishing clear interface boundaries and validating data at entry points. By focusing on contract-first design and additive evolution, you ensure stable module interfaces that prevent misuse and maintain consistent system behavior.

Yes, the approach applies to designing both REST and GraphQL endpoints by focusing on stable interface contracts, boundary validation, and additive evolution. This ensures maintainable APIs that are hard to misuse across different architectural styles and component boundaries.

Changing a public interface safely requires additive evolution, where new fields or endpoints are added without removing or altering existing ones. By maintaining stable contracts and validating at boundaries, you prevent breaking changes for dependent modules.

Validation at boundaries should be enforced whenever data crosses module or API interfaces to ensure contract compliance. This practice prevents invalid data from propagating through the system, keeping REST and GraphQL endpoints stable, secure, and hard to misuse.