GraphQL does not have response error codes. It only dictates that any response that has errors, should have an "error" field. It is not defined what this error field should contain, it can be a string or an object with a code and text, etc...

I could be wrong. Some of the graphql servers I have interacted with have given me useful error codes. E.g GitHub.

We do have nice wrappers around the request to raise a proper named exception regardless so it doesn’t matter.