Consider using JSONPath?

[geeksam]

There's a Ruby gem at 1.0.x as of this writing: https://github.com/joshbuddy/jsonpath

which claims to implement this: https://goessner.net/articles/JsonPath/

I knew this already, but didn't want the cognitive overhead of having to grok the entire path language and figure out how to interpret it in the context of my little comparison tool yet...