API-first architecture defines an API before implementing its producer or consumer. Design first aligns business, product, engineering, and security stakeholders on behavior, outcomes, and acceptable risk. section 1.2.1
Designing the API first helps teams:
- Give client and server developers a shared contract so they can work independently and in parallel. section 1.2.1
- Review robustness and security before implementation begins, applying security by design earlier in the lifecycle. section 1.2.1
- Treat APIs as products through stakeholder collaboration, strict quality checks, standards, and detailed documentation. section 1.2.1


