comparision of various barcode scanner scripts. by dynamsoft opensource https://zxing.org/w/decode.jspx available at https://github.com/zxing/zxing very popular opensource one mentioned to compare in dynamsoft youtube video. extension of zxing https://serratus.github.io/quaggaJS/ https://github.com/khanamiryan/php-qrcode-detector-decoder - from Zxing https://scanapp.org/html5-qrcode-docs/docs/apis - by google ML employee https://www.geeksforgeeks.org/create-a-qr-code-scanner-or-reader-in-html-css-javascript/ webqr.com paid ones more advanced scandit https://www.dynamsoft.com/ 750 scans per minute - folded, curved, erased, low light, shadow, side scaning etc..