React webcam QR-scanner

An implementation of a real-time QR-code scanner using WebRTC

• Based on jsQR Library
• Properly disposable resources (MediaStream)
• Web worker support (for the detection process)
• Fallback to main thread supported
• Implemented as a pure React component

Installation

Using NPM:

npm install react-webcam-qr-scanner

Using Yarn:

yarn add react-webcam-qr-scanner

Usage

Here is an example of a simple React component that utilizes react-webcam-qr-scanner

import React from "react";
import Scanner from "react-webcam-qr-scanner";

const MyAwesomeComponent = (props) => {

  const handleDecode = (result) => {
    console.log(result);
  } 

  const handleScannerLoad = (mode) => {
    console.log(mode);
  }

  return (
    <Scanner 
      className="some-classname"
      onDecode={handleDecode}
      onScannerLoad={handleScannerLoad}
      constraints={{ 
        audio: false, 
        video: { 
          facingMode: "environment" 
        } 
      }}
      captureSize={{ width: 1280, height: 720 }}
    />
  );
}

Props

Most of the props are identical to the React <video> tag (e.g. classname, name, id, event handlers etc). However, some of them define the decoder behaviour and can be set as follows:

Property | Type | Meaning ---------|------|-------- onDecode | function | a callback which fires when a QR-code is successfully decoded onScannerLoad | function | a callback which fires when QR-decoding script is successfully loaded constraints | object | a MediaStreamConstraints object captureSize | object { width: number, height: number } | Represents the size of the frame area sensitive for QR-detection

License

This package is licensed under MIT

Feedback

I'm also open to new suggestions for improving this package. Contacts: [email protected]