Simple devise user login check in node.js

deviseCheck.js

var mysql = require('mysql')
  , bcrypt = require('bcrypt')
  , db = {
    host: 'localhost',
    user: 'root',
    database: 'prod'
  };

function checkUser(email, password, callback) {
  var connection = mysql.createConnection(db);
  connection.query('SELECT encrypted_password FROM users WHERE email = ? LIMIT 1', [email], function(err, results) {
    if (err || results.length == 0) { callback(false); return; }
    var encrypted_password = results[0]["encrypted_password"];
    bcrypt.compare(password, encrypted_password, function(err, res) {
      if (err) { callback(false); return; }
      callback(!!res);
    });
  });
};