[nerdponx]

We use OpenAPI internally for communication between systems. It eliminates an entire category of bugs, and we can offload testing of schema conformance entirely to third-party tools. We've never had a bug due to a mistake in calling an internal API that I know of. And we get both internal documentation and a web UI for free via SwaggerUI and Redoc.

Good zero-config OpenAPI support is one of the best features of the FastAPI framework in Python. The "fast" part refers to the speed of basic product up and running.