Put di User

.put(function(req, res) {

        User.findById(req.params.id, function(err, user) {

            if (err) {
                res.statusCode = 404;
                res.send(err);
            }
            else if(!user){
                var user = new User();
                user._id = req.params.id;
                var neu = 1;
            }

            user.isValidPassword(req.body.password,function(err, isMatch){
                if(isMatch){
                    user.email = req.body.email;
                    user.firstName = req.body.firstName;
                    user.lastName = req.body.lastName;
                    user.password = req.body.password;
                    user.userType = req.body.userType;
                    user.nation = req.body.nation;
                    user.address = req.body.address;
                    user.city = req.body.city;
                    user.company = req.body.company;
                    user.phone = req.body.phone;

                    user.save(function(err) {
                        if (err) {
                            res.status(400).json({});
                            res.end();
                        }else {
                            if (neu == 1) {
                                res.statusCode = 201;
                                user.password = undefined;
                                res.json(user);
                            } else {
                                res.statusCode = 204;
                                res.end();
                            }
                        }
                    });

                }

            })

        });
    })