Decide on the best technique for sanitizing data before sending to client

[iampava]

When querying MongoDB data we don't want to send everything to the client (eg: password, _id).

Right now we have a somewhat functional approach by declaring functions and deleting from them. Maybe we should try extending the Schema.toJSON() method: https://contactsunny.medium.com/hide-properties-of-mongoose-objects-in-node-js-json-responses-a5437a5dbec2