index.js

	// Set up Mongoose
	var mongoose = require('mongoose');
	var Schema = mongoose.Schema;
	var ObjectId = Schema.ObjectId;

	var UserSchema = new Schema({
		id: ObjectId,
		name: String,
		registered: {type: Boolean, default: false},
		password_hash: {type: String, default: ""},
		password_salt: {type: String, default: ""}
	});
	var User = mongoose.model('User', UserSchema);

route.js

strip_sensitive_user_data = function(user) {
	console.log(user);
	delete user['password_hash'];
	delete user['password_salt'];
	console.log(user);
};

var user = new User();
user.name = name;
user.password_hash = 'test pass';
user.password_salt ='test salt';
user.registered = false;
user.save();
strip_sensitive_user_data(user);