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There's also a port of ZBar using Emscripten / asm.js: https://github.com/yurydelendik/zbarjs and a hand-made port of ZXing by Wojciech Szela here: https://github.com/wojciechszela/zxingjs

The hand-made port looks really promising. This could work alongside QuaggaJS as the decoding part, since ZXing does not locate the barcode.

Thanks, I was looking for a way to trigger a QR code scan from a webpage. I can see zxingJs is in progress