How to add custom content in fabric.Image()

Question

I am trying to use the following suggested way to store canvas in the server:

Fabric.js - how to save canvas on server with custom attributes

But in my case, I a

Answer 1

Here my solution to store custom attribute (id).

fabric.Image.fromURL(link, function(img) {
    img.set({
        id : 'image_'+index,
        width : canvas.width / 2,
        height : canvas.height / 2
    });
    canvas.add(img).renderAll().setActiveObject(img);
});

For quick review here is a working code : http://jsfiddle.net/mullainathan/dpyb7cf7/1