SQL Developer user information directory: SystemV.W.X.Y.Z/o.jdeveloper.db.connection/connections.json
o.jdeveloper.db.connection/connections.json stores the information that is required by SQL developer to establish a connection to a database.
The content of the JSON file is similar to the following snippet (which is redacted and commented for clarity - especially note that comments are not allowed in a JSON file…):