Documentation can be auto-generated from code annotations, ensuring it stays in sync with actual API changes.
To create high-quality API documentation, follow these industry standards: API Documentation Made Easy with OpenAPI & Swagger REST API Documentation Using OpenAPI (Swagger)
Tools like Swagger UI transform static text into a live "sandbox," allowing developers to test endpoints, send requests, and view real-time responses directly in the browser. " allowing developers to test endpoints
Because it is based on JSON or YAML, OpenAPI allows both humans and machines to understand an API's capabilities without needing access to the original source code. REST API Documentation Using OpenAPI (Swagger)
The specification can automatically generate client SDKs in various programming languages, significantly speeding up the integration process for consumers. Best Practices for Documentation