I'm trying to determine if something like this already exists. If not, I'll create a module for this function. See https://perlmonks.org/?node_id=1222269 for background and to see what this code outputs.
The module will help developers quickly assess json (or any other data structure) responses. It will print out a "merge" of each element in the data structure, without the actual data, so the developer can see all the fields at a glance to see the structure of the response.