Disclosure: I used to work on Google Cloud. If you want, there are plenty of JSON proxies including Cloud Endpoints [1]. I also do most things with manual curl

Disclosure: I used to work on Google Cloud. If you want, there are plenty of JSON proxies including Cloud Endpoints [1]. I also do most things with manual curl'ing, and relied on the Google APIs to have these kinds of "Fine, we'll also take JSON" setups in place. Once you've figured it out, you build the proto in your automation directly. But I basically never use grpcurl either. [1] https://cloud.google.com/endpoints/docs/grpc/transcoding https://cloud.google.com/endpoints/docs/grpc/transcoding