1  # Count the number of peers using the `scrape` feature of torrent trackers
 2  
 3  Here's a full example with `browserify`.
 4  
 5  ```
 6  npm install browserify parse-torrent bittorrent-tracker
 7  ```
 8  
 9  `scrape.js`:
10  
11  ```js
12  var Tracker = require('bittorrent-tracker')
13  var magnet = require('magnet-uri')
14  
15  var magnetURI = "magnet:?xt=urn:btih:6a9759bffd5c0af65319979fb7832189f4f3c35d&dn=sintel.mp4&tr=udp%3A%2F%2Fexodus.desync.com%3A6969&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.internetwarriors.net%3A1337&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=wss%3A%2F%2Ftracker.btorrent.xyz&tr=wss%3A%2F%2Ftracker.fastcast.nz&tr=wss%3A%2F%2Ftracker.openwebtorrent.com&tr=wss%3A%2F%2Ftracker.webtorrent.io&ws=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2Fsintel-1024-surround.mp4"
16  
17  var parsedTorrent = magnet(magnetURI)
18  
19  var opts = {
20    infoHash: parsedTorrent.infoHash,
21    announce: parsedTorrent.announce,
22    peerId: new Buffer('01234567890123456789'), // hex string or Buffer
23    port: 6881 // torrent client port
24  }
25  
26  var client = new Tracker(opts)
27  
28  client.scrape()
29  
30  client.on('scrape', function (data) {
31    console.log(data)
32  })
33  ```
34  
35  Bundle up `scrape.js` and it's dependencies into a single file called `bundle.js`:
36  
37  ```bash
38  browserify scrape.js -o bundle.js
39  ```
40  
41  `index.html`:
42  
43  ```js
44  <script src="bundle.js"></script>
45  ```
46  
47  Open `index.html` in your browser.