lỗi node-mysql:kết nối ECONNREFUSED

Hãy thử sử dụng socket mysql:

var connection = mysql.createConnection({
    user: 'user',
    password: 'pass',
    socketPath: 'mysql-socket-path', /*example: /Applications/MAMP/tmp/mysql/mysql.sock*/
    database: 'dbname'
});