Angular - Node Express - Large image upload issue

I have been trying to get my head around file uploads using Angular, Node, and Express myself. I am using Express v4.1 with connect-busboy and have the following Node, Express Code working with Daniel Farids angular-file-upload module.

SERVER.JS

    var express = require('express');       //Express Web Server
    var busboy = require('connect-busboy'); //middleware for form/file upload
    var path = require('path');             //used for file path
    var fs = require('fs-extra');           //File System - for file manipulation
    var util = require('util');         

    var app = express();
    app.use(busboy());
    app.use(express.static(path.join(__dirname, 'public')));

    /* ==========================================================
    Create a Route (/upload) to handle the Form submission
    (handle POST & PUT requests to /upload)
    Express v4 Route definition
    ============================================================ */
    app.route('/upload')
    .post(function (req, res, next) {
      var arr;
      var fstream;
      var filesize = 0;
      req.pipe(req.busboy);

      req.busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {        
        //uploaded file name, encoding, MIME type
        console.log('File [' + fieldname +']: filename:' + filename + ', encoding:' + 
             encoding + ', MIME type:'+ mimetype);

        //uploaded file size
        file.on('data', function(data) {
          console.log('File [' + fieldname + '] got ' + data.length + ' bytes');
          fileSize = data.length;
          console.log("fileSize= " + fileSize);
        });

        file.on('end', function() {
          console.log('File [' + fieldname + '] ENDed');
          console.log("-------------------------");
        });

        /*
        populate array
        I am collecting file info in data read about the file. It may be more correct to  
        read file data after the file has been saved to img folder i.e. after  
        file.pipe(stream) completes the file size can be got using stats.size as shown 
        below
        */
        arr= [{fieldname: fieldname, filename: filename, encoding: encoding, MIMEtype:   
            mimetype}];

        //Path where image will be uploaded
        fstream = fs.createWriteStream(__dirname + '/img/' + filename);
        //create a writable stream

        file.pipe(fstream);                         //pipe the post data to the file

        //stream Ended - (data written) send the post response
        req.on('end', function () {
        res.writeHead(200, {"content-type":"text/h tml"});  //http response header

        //res.end(JSON.stringify(arr)); //http response body - send json data
      });

      //Finished writing to stream
      fstream.on('finish', function () {
        console.log('Finished writing!');

        //Get file stats (including size) for file saved to server
        fs.stat(__dirname + '/img/' + filename, function(err, stats) {
          if(err)
            throw err;    
        //if a file
          if (stats.isFile()) {
            //console.log("It\'s a file & stats.size= " + JSON.stringify(stats));
            console.log("File size saved to server: " + stats.size);    
            console.log("-----------------------");
          };
        });
      });

       // error
       fstream.on('error', function (err) {
         console.log(err);
       });
      });   // @END/ .req.busboy
    })  // @END/ POST

See [My GitHub] (https://github.com/mick26/ng_Node-AdvancedFileUpload)

Note with express 4.1 alot of the middleware built into express 3.x is omitted. You will not be able to use req.files as this function is part of a third party middleware called 'formidable' which was used by another middleware called 'bodyParser'. Both formidable and body-parser are still available on NPM I think. Instead I used an npm module called connect-busboy and streamed the data. I just checked the program and uploaded a file of >320M successfully. Hope this can help you.