Take a screen shot of a website, resize it, and emit it back to the client.

server

// Error checking taken out for brevity
io.sockets.on('connection', function(client){

  client.on('capture', function (url) {

    var webshotOptions = {
      screenSize: { width: 620, height: 620 },
      shotSize: { width: 620, height: 620 }
    },
    pageObj = {},
    imgPath = './img/' + url + '.png';

    // PhantomJS
    webshot(url, imgPath, webshotOptions, function(err) {

      pageObj.url = url;
      pageObj.imgOut = './img/' + url + '-resized.png';

      // GraphicsMagick
      gm(fs.createReadStream(imgPath), url + '.png')
        .resize(155, 155)
        .write(pageObj.imgOut, function (err) {
          client.emit('resized', pageObj);
        });
    });
  });
});