docker run --name mysql-docker -e MYSQL_ROOT_PASSWORD=password -d -p 3306:3306 mysql

node index.js

{ Error: connect ECONNREFUSED 127.0.0.1:3306
    at Object._errnoException (util.js:992:11)
    at _exceptionWithHostPort (util.js:1014:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
    --------------------
    at Protocol._enqueue (DIRETORIO DO PROJETOnode_modulesmysqllibprotocolProtocol.js:144:48)
    at Protocol.handshake (DIRETORIO DO PROJETOnode_modulesmysqllibprotocolProtocol.js:51:23)
    at Connection.connect (DIRETORIO DO PROJETOnode_modulesmysqllibConnection.js:118:18)
    at Object.<anonymous> (DIRETORIO DO PROJETOapiindex.js:13:12)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
  code: 'ECONNREFUSED',
  errno: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 3306,
  fatal: true }

const mysql = require('mysql');
const connection = mysql.createConnection({
  host: '127.0.0.1',
  port: 3306,
  user: 'root',
  password: 'password',
});