javascript how to print pdf file through windows.print

assuming the users browser has pdf support, you can use a hidden iframe and browser print:

function printPDF(url) {
  const iframe = document.createElement('iframe');
  iframe.style.position = 'fixed';
  iframe.style.right = '100%';
  iframe.style.bottom = '100%';
  iframe.src = url;
  iframe.onload = () => {
    iframe.contentWindow.print();
  };
  document.body.appendChild(iframe);
}

you can also use the pdf.js library:

https://github.com/mozilla/pdf.js