how to manage a db connection in javascript

1
2//put these lines in a seperate file
3const mysql = require('mysql2');
4
5const connection = mysql.createPool({
6    host: "localhost",
7    user: "",
8    password: "",
9    database: ""
10    // here you can set connection limits and so on
11});
12
13module.exports = connection;
14
15//put these on destination page
16const connection = require('../util/connection');
17
18async function getAll() {
19    const sql = "SELECT * FROM tableName";
20    const [rows] = await connection.promise().query(sql);
21    return rows;
22} 
23exports.getAll = getAll;