router.post('/users/register', function(req, res) {
    var username = req.body.username;
    var password = req.body.password;

    User.findOne({username: username}, function() {
        if (err) console.log(err);

        if (user) {
            res.json('userExists');
        } else {
            var user = new User({
                username: username,
                passwrod: password
            });

            user.save(function(err) {
                if (err) {
                    console.log(err);
                } else {
                    res.json("userRegistered");
                }
            });
        }
    });
});