Thanks for noticing this feature.

springdoc-openapi parses Spring REST endpoints to generate OpenAPI definitions. I believe you’re looking for a tool that converts protobuf service definitions into OpenAPI definitions: protoc-gen-openapi.

Here’s an example of using protoc-gen-openapi: examples/transcoding/best-practice/bp-api.

Would it be possible to add OpenAPI support?

This project doesn’t offer direct OpenAPI support. It’s better to use a dedicated tool for this problem, like protoc-gen-openapi or protoc-gen-openapiv2.

protoc-gen-openapi is written in golang, so it does not fit well into the tech stack.
I am looking for a solution that will allow to use services for both gRPC and browser using JDK.

protoc-gen-openapi is just a tool, and it works very well. You don’t need to specifically learn or know Go to use it.

I’m very cautious about adding new features. Considering that existing tools already support this functionality, I won’t include built-in support for it in the framework. Thank you for your understanding.

I took another look at this feature, and it might work since it doesn’t need to depend on buf to build. I’m reopening this issue to get more feedback.