gistfile1.txt

// Photos
app.get('/photos', function (req, res, next) {
  var view = {};
 
  fs.readdir('./public/img/slideshow', function(err, files) {
 
    var re = /\.(gif|jpg|jpeg|tiff|png)$/i;
 
    var list = files.filter(function (file) {
      return re.test(file);
    });
 
    var randomPhotoIndex = Math.floor(Math.random() * list.length);
 
    view.photo = list[randomPhotoIndex];
 
    res.render('photos', view);
  });
});

CR passed, good codez