A complete Express 4 example using multer to read multipart/form-data png file upload and reading the file back to the client as binary data

Express with multipart-form-data file upload and read back to client

var express = require('express');
var busboy = require('connect-busboy'); // middleware for form/file upload
var fs = require('fs');

var app = express();
app.use(express.static('./public'));
app.use(busboy());

app.post('/testFormDataBinary', function(req, res) {
    req.pipe(req.busboy);
    req.busboy.on('file', function (fieldname, file, filename) {
        var tmpFilePath = __dirname + '/upload/' + filename;
        console.log('writing ', filename, 'to', tmpFilePath);
        var fstream = fs.createWriteStream(tmpFilePath);
        file.pipe(fstream);
        fstream.on('close', function (err) {
            if (err) console.log(err);
            fs.readFile(tmpFilePath, function(err, data) {
                if (err) throw err;
                console.log('reading file...', data.toString('base64'));
                res.send(data);
            });
        });
    });
});

var server = app.listen(8080, function() {
    var host = server.address().address;
    var port = server.address().port;
    console.log('Server listening at http://%s:%s', host, port);
});