NodeJS : Simpan Data Query MYSQL ke File TXT Berformat JSON

/**
 * Created by StevenNathaniel on 16-Jun-16.
 */

var mysql = require('mysql');

const fs = require('fs');

var koneksi = mysql.createConnection({host: 'localhost', database: 'latihan', user: 'root', password: ''});

koneksi.connect(function(error) {

    if (error) {

        console.error('gagal tersambung: ' + error.stack);

        return;
    }

    koneksi.query('SELECT * FROM pegawai', function (error, rows, field){

        if (!error)

            //console.log(JSON.stringify(rows));

            fs.writeFile("D:/StevenNathaniel/ProyekNodeJS/Webstorm1/test1.txt", JSON.stringify(rows));


        else

            console.log('Terjadi error: ', error.stack)

        return;
    })

    koneksi.end(function(error) {
        if(error) {

            console.error('gagal memutus koneksi: ' + error.stack)
        }
    })
});