convert canvas to image code example

Example 1: get image url from canvas

var dataURL = canvas.toDataURL();

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

function insertSiginSht(blb) {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheets()[0];
  sheet.insertImage(blb, 2,2);

}