Nodejs file upload

app.js

app.post('/upload', function(req, res){
  data = req.body;
  // get the temporary location of the file
  console.log('file => '+req.files);
  var tmp_path = req.files.file.path;
  // set where the file should actually exists - in this case it is in the "images" directory
  var target_path = './public/images/'+ req.files.file.name;
  // move the file from the temporary location to the intended location
  console.log('tmp_path = '+tmp_path+' || target_path = '+target_path);

  fs.rename(tmp_path, target_path, function(err) {
      if (err) throw err;
      // delete the temporary file, so that the explicitly set temporary upload dir does not get filled with unwanted files
      fs.unlink(tmp_path, function() {
          if (err) throw err;
          
          res.send('upload success!');
      });
  });

});

upload.html

<form class="form-horizontal" action="/upload" method="post" enctype="multipart/form-data">
  <div class="control-group">
    <label class="control-label">File upload</label>
    <div class="controls">
      <input type="file" name="file" class="btn-large">
    </div>
  </div>
  <div class="control-group">
    <div class="controls">
      <button type="submit" class="btn btn-large btn-primary">Submit</button>
    </div>
  </div>
</form>