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How to generate QR-Code using ‘react-qr-code’ in ReactJS ?

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react-qr-code is a module or package for react that provides the QRCode component to generate the code with custom values. QR code is a square grid that can easily be readable with digital devices like smartphones.

Syntax:

<QRCode
title="title"
value="value"
bgColor="background-color"
fgcolor="foreground-color"
level="level"
size={number}
/>

PropTypes:

  • value: It is the value of the Qr-code.
  • title: It is the title of Qr-code.
  • bgcolor: It is the background color of the Qr-code.
  • fgcolor: It is the foreground color of the Qr-code.
  • size: It is the size of the Qr-code.
  • level: It defines the level of Qr-code.

Prerequisites:

Creating React Application and Installing Module:

Step 1: Create the React app using the command:

npx create-react-app gfg-qrcode

Step 2: Now move into your project folder i.e. gfg-qrcode by using this command:

cd gfg-qrcode

Step 3: Now install the package into your project folder using the following command:

npm i react-qr-code

Project Structure:Project Structure

The updated dependencies after installing required module:

"dependencies": {
"@testing-library/jest-dom": "^5.17.0",
"@testing-library/react": "^13.4.0",
"@testing-library/user-event": "^13.5.0",
"react": "^18.2.0",
"react-dom": "^18.2.0",
"react-qr-code": "^2.0.12",
"react-scripts": "5.0.1",
"web-vitals": "^2.1.4"
}

Example:This example implements a qr code generator using the react-qr-code module.

Javascript




// Filename - App.js
 
import { useState } from 'react';
import QRCode from 'react-qr-code';
 
function App() {
    const [value, setValue] = useState();
    const [back, setBack] = useState('#FFFFFF');
    const [fore, setFore] = useState('#000000');
    const [size, setSize] = useState(256);
 
    return (
        <div className="App">
            <center>
                <br />
                <br />
                <input
                    type="text"
                    onChange={(e) => setValue(e.target.value)}
                    placeholder="Value of Qr-code"
                />
                <br />
                <br />
                <input
                    type="text"
                    onChange={(e) => setBack(e.target.value)}
                    placeholder="Background color"
                />
                <br />
                <br />
                <input
                    type="text"
                    onChange={(e) => setFore(e.target.value)}
                    placeholder="Foreground color"
                />
                <br />
                <br />
                <input
                    type="number"
                    onChange={(e) => setSize(parseInt(e.target.value ===
                        '' ? 0 : e.target.value, 10))}
                    placeholder="Size of Qr-code"
                />
                <br />
                <br />
                <br />
                {value && (
                    <QRCode
                        title="GeeksForGeeks"
                        value={value}
                        bgColor={back}
                        fgColor={fore}
                        size={size === '' ? 0 : size}
                    />
                )}
            </center>
        </div>
    );
}
 
export default App;


Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:



Last Updated : 10 Nov, 2023
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