mysql,createpool() for node multiple database connection > https://github.com/mysqljs/mysql#pooling-connections

gistfile1.txt

const express = require('express');
const app = express();
const mysql = require('mysql');
const pool = mysql.createPool({
	connectionLimit : 10,
	host: "localhost",
	user: "yourusername",
	password: "yourpassword"
});

app.post('/test', (req, res) => {
	pool.query("SELECT * FROM Mytable", function (err, result, fields) {
		if (err) throw err;
		console.log(result);
	});
});