node.js - multipart File uploads using NodeJS -

i having troubles getting file uploads work nodejs. using dropzone.js create form sends post request /file-upload here:

<form action="/file-upload" class="dropzone dragndrop" id="my-awesome-dropzone"></form>  

then have route in app.js:

app.post('/file-upload', routes.upload); 

then handler:

exports.upload = function(req, res){      console.log(req.files);      res.send("ok"); } 

however, upload function here never called. server crashes error first:

events.js:69         throw arguments[1]; // unhandled 'error' event                        ^ error: invalid data     @ writestream._write (fs.js:1616:31)     @ onwrite (_stream_writable.js:265:14)     @ writablestate.onwrite (_stream_writable.js:94:5)     @ fs.js:1628:5     @ object.wrapper [as oncomplete] (fs.js:475:5)     @ process._makecallback (node.js:321:24) 

so not sure should because appears not fault. followed other tutorials , saw nothing wrong. also, when inspect network under chrome dev tools, shows:

request url:http://localhost:3000/file-upload **request headers** accept:application/json cache-control:no-cache content-type:multipart/form-data; boundary=----webkitformboundarymmlskbfqskficjfe origin:http://localhost:3000 pragma:no-cache referer:http://localhost:3000/ user-agent:mozilla/5.0 (x11; linux i686) applewebkit/537.17 (khtml, gecko) chrome/24.0.1312.52 safari/537.17 x-file-name:screenshot 2013-03-20 12:23:42.png x-requested-with:xmlhttprequest **request payload** ------webkitformboundarymmlskbfqskficjfe content-disposition: form-data; name="file"; filename="screenshot 2013-03-20 12:23:42.png" content-type: image/png   ------webkitformboundarymmlskbfqskficjfe-- 

@user568109 , @nick-fishman correct; should use bodyparser middleware this.

please see sample code basic file upload form below. (note: need create "uploads" directory store files.)

file-upload.js:

var express = require("express"),                                                                     app = express();                                                                               // tell express use bodyparser middleware                                                  // , set upload directory                                                                       app.use(express.bodyparser({ keepextensions: true, uploaddir: "uploads" }));                      app.engine('jade', require('jade').__express);                                                     app.post("/upload", function (request, response) {                                                    // request.files contain uploaded file(s),                                               // keyed input name (in case, "file")                                                  // show uploaded file name                                                                    console.log("file name", request.files.file.name);                                                console.log("file path", request.files.file.path);                                                 response.end("upload complete");                                                              });                                                                                                // render file upload form                                                                        app.get("/", function (request, response) {                                                           response.render("upload_form.jade");                                                          });                                                                                                app.listen(3000); 

views/upload_form.jade:

doctype 5 html     head         title upload form     body         h1 upload file         form(method="post", action="/upload", enctype="multipart/form-data")             input(type="file", name="file")             input(type="submit")