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Hello, I would like to add a feature to scan QR code using the mobile device, Is there any service to make it (javascript) thanks
There's Instascan, which works using WebRTC:
https://github.com/schmich/instascan
Just not that it won't work on iOS devices, since they don't support WebRTC. For those devices you'll have to get into app development, which can be pretty easily done with projects like Ionic or Cordova.
hi you can see example code on https://qrscanner.org/ all built on javacript no backend
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