Force download file (via Ajax)

forcedownload.js

const url = "https://www.google.com.vn/images/branding/googlelogo/2x/googlelogo_color_120x44dp.png";

const forceDownload = url => {
 try {
    const link = document.createElement('a');
    const fileName = url.substring(url.lastIndexOf('/') + 1, url.length);
    const event = new MouseEvent( "click", { "button": 1, "which": 1 });

    link.href = url;
    link.download = fileName;
    link.dispatchEvent(event);
  } catch(e) {
     document.location = url;
  }
}

forceDownload(url);