Export svg code to .svg file then upload local?

Question

My code:

var files = jQuery('#cargatulogo')[0].files;
Potrace.loadImageFromFile(files[0]);
Potrace.process(function () {
    svg = Potrace.getSVG(0.8);
    console.log(svg);
});

result console.log(svg):

I want to save it and upload it local.

Thanks.