JavaScript: Base64 image to Blob

base64ToBlob.js

// String base 64 to blob 
function dataURItoBlob(dataURI) {

  var byteString = atob(dataURI.split(',')[1]);
  var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
  
  var ab = new ArrayBuffer(byteString.length);
  var ia = new Uint8Array(ab);
  
  for (var i = 0; i < byteString.length; i++) {
    ia[i] = byteString.charCodeAt(i);
  }
  var blob = new Blob([ab], {type: mimeString});
  
  return blob;
}