bljad.js

const mysql = require('mysql');
const Express = require('express');

const connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : '123',
  database : 'node_test'
});

const getQuery = async () => {
    const general = [];
    await connection.connect();

    await connection.query('select * from test', (error, results) => {
        if (error) throw error;
        general.push(JSON.stringify(results));
        console.log(general);
        return;
    });

    await connection.end();
    return general;
};
const app = new Express;

app.get('/', (req, res) => {
    res.send(getQuery());
  });
  
app.listen(3000, () => {
    console.log('Example Express app listening on port 3000!');
  });