gem-hunter

A component for React. This library works with React and React Native (using React Native SVG).

npm i react-qr-code

When using this library with React Native, you will also need to have react-native-svg installed.

npm i react-native-svg
cd ios && pod install

import React from "react";
import ReactDOM from "react-dom";
import QRCode from "react-qr-code";

ReactDOM.render(<QRCode value="hey" />, document.getElementById("Container"));

Note: If the QR code is likely to appear next to dark objects, you will need to wrap it in a light-colored container to preserve the 'quiet zone', e.g.

<div style={{ background: 'white', padding: '16px' }}>
  <QRCode ... />
</div>

Responsive QR code example:

// Can be anything instead of `maxWidth` that limits the width.
<div style={{ height: "auto", margin: "0 auto", maxWidth: 64, width: "100%" }}>
  <QRCode
    size={256}
    style={{ height: "auto", maxWidth: "100%", width: "100%" }}
    value={value}
    viewBox={`0 0 256 256`}
  />
</div>

Adheres to the official QR spec and can store up to 2953 characters in value.

react-qr-code encodes data in UTF-8 byte mode to ensure non-ASCII text (e.g., Korean, Japanese, emoji) renders and scans correctly. Just pass a normal JavaScript string:

<QRCode value="한글 테스트 😊" />

No additional encoding is required on your side.

1. Build the demo library bundle in watch mode:
   • In one terminal: npm run demo-web-watch
2. Run the demo app:
   • In another terminal: npm run demo
3. Open the demo in your browser (Expo starts it automatically) and type a non-ASCII value (e.g., 안녕하세요, こんにちは, or an emoji) into the input.
4. Scan the QR code with a phone camera app. The decoded text should match exactly.

MIT