Simple node.js script which downloads mp3 files from https://www.myinstants.com/

dl.js

var https = require('https'),
    URL = require('url'),
    fs = require('fs'),
    path = require('path');

// usage
if (process.argv[2] == null){
    console.log("Usage: node dl <downloadurl 1> <downloadurl 2> ... <downloadurl n> ");
    console.log("Where the download url is from https://www.myinstants.com/");
    process.exit(1);
}

// grab the urls
var urls = process.argv.slice(2);

// create our directory if it isn't already there
if ( !fs.existsSync( path.join( __dirname, "myinstants_sounds")))
        fs.mkdirSync( path.join( __dirname, "myinstants_sounds"));

// start our downloads
console.log("---- Downloading ----");
download();

// we use this function to download one at a time so we don't overload the server
function download(){

    var url = urls.shift();
    
    if (url == null) {
        console.log("All done.");
        process.exit(0);
    }
    
    var parsedUrl = URL.parse(url);

    var url_options = {
        hostname: parsedUrl.hostname,
        path: parsedUrl.path,
        method: "GET"
    };

    https.request( url_options, res => {

        var data = "";
        res.setEncoding('utf8');
        res.on('data', chunk => data += chunk);
        res.on('end', () => {

            var reg = /onclick="play\(\'\/media\/sounds\/(.+)\'\)/g
            var mp3name = reg.exec(data)[1];

            // reuse our old object, just reset the path
            url_options.path = "/media/sounds/" + mp3name;

            var ws = fs.createWriteStream( path.join( __dirname, "myinstants_sounds", mp3name));
            ws.on('finish', () => {
                console.log(mp3name);
                download();
            });

            https.request( url_options, res => res.pipe( ws )).end();

        });


    }).end();
}