API Documentation
Practices and tools for documenting APIs clearly, interactively, and maintainably, from OpenAPI specifications to documentation portals.
seed#api-docs#openapi#swagger#documentation#developer-experience
What it is
API documentation is the interface between your service and its consumers. Good documentation includes complete reference, practical examples, quick start guides, and error handling.
OpenAPI (Swagger)
Industry standard for describing REST APIs. A YAML/JSON file defining endpoints, parameters, responses, and schemas. Generates interactive documentation automatically.
Tools
| Tool | Use |
|---|---|
| Swagger UI | Interactive documentation |
| Redoc | Elegant static documentation |
| Stoplight | Design-first with visual editor |
| Postman | Collections + documentation |
Best practices
- Generate docs from specification (single source of truth)
- Include real examples for each endpoint
- Document errors and status codes
- Maintain API changelog
- Sandbox/playground for code-free testing
Why it matters
API documentation is the user interface for developers. If they cannot understand how to use your API in minutes, they will look for an alternative. Documentation generated from the specification guarantees it is always in sync with the implementation.
References
- OpenAPI Specification — Standard.
- Swagger/OpenAPI — SmartBear, 2024. API documentation tools.
- Redocly — Redocly, 2024. API documentation platform.