A QR code (quick-response code) is a type of two-dimensional matrix barcode,

QR codes contain data for a locator, an identifier, and a website visitor tracking. To efficiently store data, QR codes use four standardized modes of encoding (i) numeric, (ii) alphanumeric, (iii) byte or binary, and (iv) kanji.

Source : Documentation

The following is an example of the program code 

<link
rel="stylesheet"
href="https://tamddk.github.io/library/assets/donate/donate.sodik.css"
/>

<!-- QR CODE -->
<div class="m-4">
  <div
    class="block max-w-sm p-6 text-center bg-white border border-gray-200 rounded-lg shadow hover:bg-gray-100 dark:bg-gray-800 dark:border-gray-700 dark:hover:bg-gray-700"
    style="margin: 0 auto"
  >
    <div id="result-qrcode"></div>
    <div id="result-qrcode-input" style="line-break: anywhere"></div>
  </div>
</div>

<script
  src="https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.js"
  integrity="sha512-is1ls2rgwpFZyixqKFEExPHVUUL+pPkBEPw47s/6NDQ4n1m6T/ySeDW3p54jp45z2EJ0RSOgilqee1WhtelXfA=="
  crossorigin="anonymous"
  referrerpolicy="no-referrer"
></script>

<script>
  // QR Code
  var link_owner = "https://www.instagram.com/project_sodik/";
  var rslt = document.getElementById("result-qrcode");
  rslt.innerHTML = "";
  new QRCode(rslt, {
    text: link_owner,
    width: 384,
    height: 384,
    colorDark: "#000000",
    colorLight: "#ffffff",
    correctLevel: QRCode.CorrectLevel.H,
  });
  document.getElementById("result-qrcode-input").innerHTML =
    "<br /><hr />" + link_owner;

  // [open-source] : location:github.com/tamddk/library/tree/main/getQRCode
</script>