I have created the following script in order to read data from Mobile App DB (which is based on MongoDB) from Oracle SQL Developer:
DECLARE l_param_list VAR
Orace provides PL/SQL DOM APIs for JSON handling. Strongly recommend using it, as it provides tons of useful APIs.
https://docs.oracle.com/database/122/ADJSN/using-PLSQL-object-types-for-JSON.htm#GUID-F0561593-D0B9-44EA-9C8C-ACB6AA9474EE