https://redis.io/commands/json.objkeys/

 
JSON.OBJKEYS key [path]
Available in: Redis Stack / JSON 1.0.0 Time complexity: O(N) when path is evaluated to a single value, where N is the number of keys in the object, O(N) when path is evaluated to multiple values, where N is the size of the key

Return the keys in the object that's referenced by path