Access denied for user 'user'@'localhost'

Question

var mysql = require('mysql');

var db = mysql.createConnection({
    host: "localhost",
    user: "John",
    password: "*********"
});

module.exports = db;

Answer 1

You need to grant access to user John to the database you're trying to use:

mysql> grant all privileges to John@localhost identified by 'your_password';
mysql> flush privileges;

Then try again.