Change the name of uploaded file in node.js - node.js

Question

I am using node.js to upload a file. But it uploads the file in the /tmp folder with a random like name (such as: 132d439bb31ee13daaf6ce02e223738f). I want the node to upload the file in a given directory with a given name. How can I make it? here is my code:
var http = require("http"),
url = require("url"),
sys = require("sys"),
events = require("events"),
fs = require("fs"),
formidable = require('formidable'),
util = require('util');
var server = http.createServer(function(req, res) {
switch (url.parse(req.url).pathname) {
case '/':
display_form(req, res);
break;
case '/upload':
upload_file(req,res);
break;
default:
show_404(req, res);
break;
}
});
server.listen(8124);
function display_form(req, res) {
//displays an html form with an upload and a submit button
}
function upload_file(req, res) {
if (req.url == '/upload' && req.method.toLowerCase() == 'post') {
// Instantiate a new formidable form for processing.
var form = new formidable.IncomingForm();
// form.parse analyzes the incoming stream data, picking apart the different fields and files for you.
form.parse(req, function(err, fields, files) {
if (err) {
// Check for and handle any errors here.
console.error(err.message);
return;
}
form.on('fileBegin', function(name, files) {
files.name="./guake.up";
});
res.writeHead(200, {'content-type': 'text/plain'});
res.write('received upload:\n\n');
console.log(files.name);
// This last line responds to the form submission with a list of the parsed data and files.
res.end(util.inspect({fields: fields, files: files}));
});
return;
}
}
function show_404(req, res) {
//shows a 404 page
}

Answer 1

I found the answer and I only need to add the following code before my form.parse method:
form.on('error', function(err) {
throw err;
})
/* this is where the renaming happens */
.on ('fileBegin', function(name, file){
//rename the incoming file to the file's name
file.path = form.uploadDir + file.name;
});
and the problem is solved