It's literally a webpage with some javascript, so if you save it along with the asset files, you can just open the page in browser from your filesystem, no need to specially host it or start anything.
But yes, I agree running a command like qrencode from terminal is easier in the long run.
Yes, but it depends if the node.js app has the option of generating a fully static site. But it will also need to generate relative links for the browser to be able to directlyy load the site
But yes, I agree running a command like qrencode from terminal is easier in the long run.