Auth Boiler Plate with Node.js-Logout

app.get('/api/users/logout', auth, (req, res) => {
  User.findOneAndUpdate({ _id: req.user._id }, { token: '' }, (err, user) => {
    if (err) return res.json({ success: false, err });
    return res.status(200).send({
      success: true,
    });
  });
});