form.html

<h2>Multipart</h2>
<form action="/upload" enctype="multipart/form-data" method="post">
  <input type="text" name="title"><br>
  <input type="file" name="upload" multiple="multiple"><br>
  <input type="submit" value="Upload">
</form>

<hr>

<h2>Standard</h2>
<form action="/upload" method="post">
  <input type="text" name="title"><br>
  <input type="file" name="upload" multiple="multiple"><br>
  <input type="submit" value="Upload">
</form>

multipart.txt

------WebKitFormBoundaryQA9Btta4EsAMz6ID
Content-Disposition: form-data; name="title"

title
------WebKitFormBoundaryQA9Btta4EsAMz6ID
Content-Disposition: form-data; name="upload"; filename="file.png"
Content-Type: image/png

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server.js

var http = require('http'),
    util = require('util');

http.createServer(function(req, res) {
  if (req.url == '/upload' && req.method.toLowerCase() == 'post') {

    var postData = '';
    req.on('data', function(data) {
      postData += data;
    });

    req.on('end', function(){
      res.writeHead(200, {'content-type': 'text/html'});
      res.write('<pre>received upload:\n\n');
      res.write(postData);
      res.write('</pre>');
      res.end();
    })

    return;
  }

  console.log("/");
  // show a file upload form
  res.writeHead(200, {'content-type': 'text/html'});
  res.end(
    '<h2>Multipart</h2>' +
    '<form action="/upload" enctype="multipart/form-data" method="post">'+
    '<input type="text" name="title"><br>'+
    '<input type="file" name="upload" multiple="multiple"><br>'+
    '<input type="submit" value="Upload">'+
    '</form>' +
    '<hr>' +
    '<h2>Standard</h2>' +
    '<form action="/upload" method="post">'+
    '<input type="text" name="title"><br>'+
    '<input type="file" name="upload" multiple="multiple"><br>'+
    '<input type="submit" value="Upload">'+
    '</form>'
  );
}).listen(9090);

standard.txt

title=title&upload=file.png