QR code scanner

You could look and see what plugins there currently are
https://www.ads-software.com/plugins/search/qr+code/

But generating them and scanning them are very different. You can look on GitHub also to see what is available.

i tried looking through there, but all they offers are generating the qr code for individual page. what i am looking for is a reader. A reader that can be implemented into the website. and yes i also did looked through github but not much findings from there.

I did this for a client a couple months ago, and used the following:

https://cirocosta.github.io/qcode-decoder/

It’s a little tricky incorporating the code into WordPress. You may find it easier to create a standalone scanning page.

Moved to Fixing WordPress, this is not a Developing with WordPress topic.