Node JS File Upload with Formidable Module

nodeUploader.js

// Include Main HTTP module
var http = require('http');

// Include Formidable libarary for Upload Processing
var formidable = require('formidable');

// Include file system module
var fs = require('fs');

// Create server for listening incoming connections
http.createServer(function (req, res) {
  
  // File upload check with requested url
  if (req.url == '/fileupload') {
    
    // Create form object with formidable
    var form = new formidable.IncomingForm();
    
    // Parse the form
    form.parse(req, function (err, fields, files) {
       
      // Get old file path
      var oldpath = files.filetoupload.path;
      
      // Set new file path
      var newpath = 'C:/Users/Your Name/' + files.filetoupload.name;
      
      // Move file from old path to new path
      fs.rename(oldpath, newpath, function (err) {
      
        // If any error then, throw it
        if (err) throw err;
        
        // Successfull confirmation
        res.write('File uploaded and moved!');
       
        res.end();
      });
 });
  } else {
  
    // Set header to text/html
    res.writeHead(200, {'Content-Type': 'text/html'});
    
    // Write response with file upload form 
    res.write('<form action="fileupload" method="post" enctype="multipart/form-data">');
    res.write('<input type="file" name="filetoupload"><br>');
    res.write('<input type="submit" name="submitNodeJSUploader">');
    res.write('</form>');
    return res.end();
  }
}).listen(8080);

var oldpath = files.filetoUpload.path;
TypeError: Cannot read property 'path' of undefined

use:
var oldpath = files.fileupload.path;

to see all the attributes you can use:
var util = require('util');

var form = new formidable.IncomingForm();
form.parse(req, function(err, fields, files){
res.end(util.inspect({fields: fields, files: files}));

On the util inspect i got to know that, the uploaded file details became JSON object conatiaing an array named as 'PersistentFile' in this it contains filepath, originalFilename, etc., to access it I use:

var form = new formidable.IncomingForm();
form.parse( req, function(err, fields, files) {
var oldPath = files.fileUpload[0].filepath;
});

The property fileUpload contains capital 'U" and in it the 'PersistentFile' is an array at location zero (0).
The originalFilename, size, _event, hashAlgorithm, filepath, newFilename, mimeType, etc.,

//The above code works for me.