[iansinnott]

Can second this approach. At a past job we did the same, except to connect the frontend to a Go backend.

I really like that the openAPI approach is language agnostic, and makes it relatively simple to support SDKs for many other languages if needed. For any company where the API itself is a product, OpenAPI is great.

[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.