express youtube

youtube.js

  (function() {
    'use strict';
 
    var express     = require('express'),
        app         = express(),
        ytdl        = require('ytdl'),
        EXT         = 'mp4',
        URL         = 'https://www.youtube.com/watch?v=',
        PORT        = 8888;
    
    app.get('/:id', function(req, res) {
        var id  = req.params.id;
        
        download(res, id);
    });
 
    app.listen(PORT);
 
    function download(res, id) {
        ytdl(URL + id, {
            filter: filter
        }).pipe(res);
    }
    
    function filter(format) {
        var is = format.container === EXT;
        
        return is;
    }
 
})();