#api-documentation

Document APIs with OpenAPI/Swagger. Structure: 1. OpenAPI specification (YAML/JSON). 2. Paths for endpoints. 3. Request/response schemas. 4. Parameter descriptions. 5. Authentication schemes. 6. Example requests/responses. 7. Error codes documentation. 8. Interactive try-it-out. Use Swagger UI for visualization. Generate from code or design-first. Keep docs in sync with implementation.