canvas as image code example

Example 1: javascript todataurl

var image = new Image();
image.src = canvas.toDataURL();

Example 2: convert canvas to DataUrl and insert image in google sheet

function savejSigToSht() {

        var dataURL = canvas.toDataURL('image/png');

        google.script.run.insertSig(dataURL);
        google.script.host.close();
    }