Tip: flat, formidable and aws s3

I'm new to server-side programming with node.js. Now I am going with it a tiny webapp and starting to learn. The following code snippet WORKS. But I would like to know if this is more or less the correct way to do a simple file upload from a form and throw it in aws s3:

app.router.post('/form', { stream: true }, function () {

    var req = this.req,
        res = this.res,
        form = new formidable.IncomingForm();

    form
    .parse(req, function(err, fields, files) {
        console.log('Parsed file upload' + err);
        if (err) {
            res.end('error: Upload failed: ' + err);
        } else {
            var img = fs.readFileSync(files.image.path);
            var data = {
                Bucket: 'le-bucket',
                Key:    files.image.name,
                Body:   img
            };
            s3.client.putObject(data, function() {
                console.log("Successfully uploaded data to myBucket/myKey");
            });
            res.end('success: Uploaded file(s)');
        }
    });
});

      

        
        
        
      

    

Note: I had to disable the buffer in union / flatiron.plugins.http.

What I would like to know is when to download the file and when to sync it. It will be a really tiny webapp with little traffic.

If this is more or less good, please consider it as a sign of working code, which I will also throw in the gist. It's not easy to find documentation and working examples of this sort of thing. I like flatiron alot. But the small modular approach results in a lot of splattering documents and examples all over the web, speaking only of tutorials.