upload.js

var opts = {
  'url': someUrl,
  'method': 'POST'
};
var r = request(opts, function(err, response, body) {
  if (err) {
    return callback(err);
  }
  
  return callback(null, response.headers.location);
});

// Add some parameters
var form = r.form();

// Append a few basic parameters (these values are all strings or numbers)
_.each(uploadInfo.upload_params, function(value, key) {
  form.append(key, value);
});

// Append a file
form.append('file', fs.createReadStream(filePath));