This solution is robust and free-of-charge... 😉

Check this out:

https://github.com/saschawildgrube/servicenow-devtools/blob/master/update/sys_script_include_ee4a4c0...

The DevTools app contains a truckload of reusable scripts and
features to support your app development.

Fork at will!

Please refer to the below Article. Thanks.

QR code code generator - ServiceNow

Regards,

Nayan

I am unable to generate QR code after following your code. Please guide me.

Which approach did you take?

The client side rendering using the qrcode library in a UI script or the server-side approach using DevTools?