QR Scanner

Javascript QR Code Scanner based on Cosmo Wolfe's javascript port of Google's ZXing library.

In this library, several improvements have been applied over the original port:

Web cam scanning support out of the box

Uses the browser's native BarcodeDetector if available

Lightweight: ~59.3 kB (~16.3 kB gzipped) minified with Google's closure compiler. If the native BarcodeDetector is available, only ~15.3 kB (~5.6 kB gzipped) are loaded.

Improved performance and reduced memory footprint.

Runs in a WebWorker which keeps the main / UI thread responsive.

Can be configured for better performance on colored QR codes.

According to our benchmarking this project's scanner engine's detection rate is about 2-3 times (and up to 8 times) as high as the one of the most popular javascript QR scanner library LazarSoft/jsqrcode. Also the other library oftentimes misreads the content of QR codes, while for this project no misreads occurred in the benchmarking.

The library supports scanning a continuous video stream from a web cam as well as scanning of single images.

The development of this library is sponsored by nimiq, world's first browser based blockchain.