I have a simple server which has this method

app.post('/', function (req, res) {

    res.sendfile(path.resolve(req.files.image.path));

});

How do I get data, on client side in Image object?
this is my ajax.success method,at least what i tried...

success: function (res) {

    console.log(res);

    var canvas = document.getElementById(mainCanvas);

    var ctx = canvas.getContext(2d);

    var img = new Image();

    img.onload = function () {

        ctx.drawImage(img,0,0);

    }

    img.src=res

}

Really looking for answer already for 2 days... tried a lot of ways, but none worked. I am not even sure what I receive from server - is it bytes array?

SOLUTION:
so, i figured out that post request does not need to send file back, Image.src sends its own get request to server

app.post('/', function (req, res) {

res.send(path.basename(req.files.image.path));

});

/* serves all the static files */

app.get(/^(.+)$/, function(req, res){ 

     console.log('static file request : ' + req.params);

     res.sendfile( __dirname + req.params[0]); 

});

client:

success: function (res) {

                var canvas = document.getElementById(mainCanvas);

                var ctx = canvas.getContext(2d);

                var img = new Image();

                console.log(res);

                img.onload = function () {

                    ctx.drawImage(img,0,0);

                }

                img.src=/uploads/+res;

            }