javascript - Why can't I delete a mongoose model's object properties?

Question

When a user registers with my API they are returned a user object. Before returning the object I remove the hashed password and salt properties. I have to use

user.salt = undefined;
user.pass = undefined;

Because when I try

delete user.salt;
delete user.pass;

the object properties still exist and are returned.

Why is that?

Answer 1

To use delete you would need to convert the model document into a plain JavaScript object by calling toObject so that you can freely manipulate it:

user = user.toObject();
delete user.salt;
delete user.pass;