Can you share an unusual or little-known fact about FastAPI?

A little-known fact about FastAPI is that it automatically generates interactive API documentation based on OpenAPI and JSON Schema standards without additional configuration. It supports multiple documentation interfaces, such as Swagger UI and ReDoc.

This allows developers and testers to see and try out the API directly from the browser, significantly speeding up development and integration.

Example: after starting the FastAPI application, Swagger UI opens at /docs, and ReDoc-style documentation is available at /redoc.