login to mysql from express.app

index.js

var express = require('express');
var http = require('http');
var mysql = require('mysql');
var app = express();

var connection = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: '',
    database: 'heroes'
});

connection.connect(function(error) {
    if (!!error) {
        console.log('Error - big ugly problem');
    } else {
        console.log('Connected');
    }
});

app.get('/', function (req, res) {
    res.send('hello');
    connection.query("SELECT * FROM heroeslist",function (error, rows, fields) {
    if (!!error) {
        console.log("Error in the query");
    } else {
        console.log("successfull query");
    }
    });
});

app.listen(3000, function () {
   console.log('running');
});