How do you extract POST parameter in node.js?

I was trying to send data from Drupal page to node

Drupal code

function sample_submit($form, &$form_state) { //Function to connect with node and save into Mongo using node
  $jsonData = check_plain($form_state['values']['jsonData']);
  $request_url = "http://10.20.5.112:3000/save";
  $options = array(
                'method' => 'POST',
                'data' => $jsonData,
                'timeout' => 15,
                'headers' => array('Content-Type' => 'application/x-www-form-urlencoded'),
        );
    $result = drupal_http_request($request_url, $options);
}

Node.Js

app.post('/save', function(req, res){  //Rest Api Function to get data from pushed by drupal
  //console.log(req.data);
  res.send('Success');
});

How to get the data send from drupal as jsondata in the node.js