var hash = results[0].password;

var hash = results.password;

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

  db.query('SELECT * FROM user WHERE username = ?', [username], function (error, results, fields) {
    if (error) throw error;
    var hash = results[0].password;
    console.log(hash);
  });

  res.redirect('/');

});