progress.js

var http = require('http')
var multiparty = require('../')
var util = require('util')

var PORT = process.env.PORT || 8080

var server = http.createServer(function (req, res) {
  if (req.url === '/') {
    res.writeHead(200, { 'content-type': 'text/html' })
    res.end(
      '<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>'
    )
  } else if (req.url === '/upload') {
    var form = new multiparty.Form()

    form.on('progress', function (bytesReceived, bytesExpected) {
      if (bytesExpected === null) {
        return
      }

      var percentComplete = (bytesReceived / bytesExpected) * 100
      console.log('the form is ' + Math.floor(percentComplete) + '%' + ' complete')
    })

    form.parse(req, function (err, fields, files) {
      if (err) {
        res.writeHead(400, { 'content-type': 'text/plain' })
        res.end('invalid request: ' + err.message)
        return
      }
      res.writeHead(200, { 'content-type': 'text/plain' })
      res.write('received fields:\n\n ' + util.inspect(fields))
      res.write('\n\n')
      res.end('received files:\n\n ' + util.inspect(files))
    })
  } else {
    res.writeHead(404, { 'content-type': 'text/plain' })
    res.end('404')
  }
})
server.listen(PORT, function () {
  console.info('listening on http://0.0.0.0:' + PORT + '/')
})