React-qrcode-reader NPM

react-qrcode-reader

QRCode Reader for modern React

install

$ npm i react-qrcode-reader

how to use

1. with onRead

import React from 'react';

import QrCodeReader, { QRCode } from 'react-qrcode-reader';

export function App() {
  const [val, setVal] = React.useState<string>('');

  const handleRead = (code: QRCode) => {
    setVal(code.data);
  };

  return (
    <>
      <QrCodeReader delay={100} width={500} height={500} onRead={handleRead} />
      <p>{val}</p>
    </>
  );
}

2. with setter for hook

import React from 'react';

import QrCodeReader, { QRCode } from 'react-qrcode-reader';

export function App() {
  const [val, setVal] = React.useState<string>('');

  return (
    <>
      <QrCodeReader delay={100} width={600} height={500} action={setVal} />
      <p>{val}</p>
    </>
  );
}

API

<QrCodeReader> has 3 required props and 3 optional props.

prop	type	instruction	default
delay	number	delay of recapture
width	number	width of image
height	number	height of image
onRead	(QRCode) => void	callback on read qrcode	none
action	(string) => void	action on read qrcode	none
videoConstraints	object	MediaStreamConstraints(s) for the video	none

argument of onRead is QRCode data. QRCode is interface in jsQR.

argument of action is the string included in QRCode. You can simply get value of QRCode by this.

argument of videoConstraints is the object included in Webcam. We can build a constraints object by passing it to the videoConstraints prop. Please take a look at the MDN docs to get an understanding how this works: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia