QR-code reader on a wordpress website

Hello,
I have to put a QR-code reader feature on a wordpress site. I did not found any wordpress extension for it. So I decided to go on specific development .. So I would like to use a pure JS stuff for a QR-code reader feature. Which solution have you ever used for that ? Every stuff I found work with reactjs and nodejs, but I’m searching for a something we can use without framework nor node . Thank you