React-webcam-qr-scanner NPM

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