API Design First
API Design First is a development approach where the API specification is designed and documented before any implementation code is written. It involves creating a formal contract (e.g., using OpenAPI/Swagger) that defines endpoints, data models, and behaviors upfront. This methodology ensures consistency, facilitates collaboration between teams, and enables parallel development of client and server components.
Developers should use API Design First when building scalable, maintainable APIs, especially in microservices architectures or when multiple teams need to integrate. It reduces integration errors by providing a clear contract early, supports automated documentation and testing, and allows for client SDK generation before backend completion. This approach is ideal for projects requiring strict API governance, versioning, and long-term maintainability.