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QR Code Generator in React (Step-by-Step Guide)

QR Code Generator in React (Step-by-Step Guide)

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2025-04-17 0 113
Resource Number 2805198 Last Updated 2025-04-17
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A QR code generator allows users to convert text, URLs, or data into a scannable code for sharing or embedding. With React, we can build one quickly using existing libraries and hooks.

⚙️ Tech Stack

  • React (functional components + hooks)

  • qrcode.react library

  • Optionally: Tailwind or Bootstrap for styling

🛠️ 1. Setup Your React Project

If you don’t have one already:

bash
npx create-react-app qr-code-generator
cd qr-code-generator
npm install qrcode.react

📦 2. Install QR Code Library

Install the dependency:

bash
npm install qrcode.react

This package lets you render a <QRCode /> component with any input.

🧪 3. Create the QR Generator Component

jsx
// src/App.js

import React, { useState } from 'react';
import QRCode from 'qrcode.react';
import './App.css';

function App() {
const [text, setText] = useState('https://example.com');

return (
<div style={{ textAlign: 'center', marginTop: '50px' }}>
<h1>🔳 QR Code Generator</h1>
<input
type="text"
value={text}
onChange={(e) => setText(e.target.value)}
placeholder="Enter text or URL"
style={{ width: '300px', padding: '10px', fontSize: '16px' }}
/>
<div style={{ margin: '40px auto' }}>
<QRCode value={text} size={256} level="H" includeMargin={true} />
</div>
</div>
);
}

export default App;

🎨 4. Styling (optional)

You can add basic styling in App.css or use Tailwind/Bootstrap:

css
body {
background: #f8f9fa;
font-family: Arial, sans-serif;
}
input {
border: 1px solid #ccc;
border-radius: 5px;
}

📥 5. Add Download Button (Export QR Code)

jsx
import React, { useState, useRef } from 'react';
import QRCode from 'qrcode.react';

function App() {
const [text, setText] = useState('https://example.com');
const qrRef = useRef(null);

const downloadQR = () => {
const canvas = qrRef.current.querySelector('canvas');
const url = canvas.toDataURL("image/png");
const a = document.createElement("a");
a.href = url;
a.download = "qr-code.png";
a.click();
};

return (
<div style={{ textAlign: 'center', marginTop: '50px' }}>
<h1>🔳 QR Code Generator</h1>
<input
type="text"
value={text}
onChange={(e) => setText(e.target.value)}
placeholder="Enter text or URL"
style={{ width: '300px', padding: '10px', fontSize: '16px' }}
/>
<div ref={qrRef} style={{ margin: '40px auto' }}>
<QRCode value={text} size={256} level="H" includeMargin={true} />
</div>
<button onClick={downloadQR} style={{ padding: '10px 20px' }}>
Download QR Code
</button>
</div>
);
}

✅ Features

  • Real-time QR code generation

  • Adjustable input

  • One-click PNG download

  • Fully responsive

🧩 Optional Upgrades

Feature Description
Color Picker Custom QR foreground/background colour
Logo in Center Overlay a logo using canvas manipulation
Shortening URLs Integrate with bit.ly API
Mobile Optimisation Make it usable on phones with large touch targets
QR Type Detection Detect type (URL, text, vCard, WiFi config, etc.)

🧠 Educational Benefits

This is a great beginner-to-intermediate project that teaches:

  • React state management

  • Canvas DOM element access

  • File downloads in the browser

  • Component-based UI design

📦 Deployment Ideas

  • Add to your personal portfolio

  • Use in admin dashboards (QR login, event access)

  • Build a Chrome extension for quick QR generation

  • Integrate with invoice systems to encode payment links

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systemhere Industry News QR Code Generator in React (Step-by-Step Guide) https://www.systemhere.com/information/qr-code-generator-in-react-step-by-step-guide.html

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Q&A

What is the delivery method?

  • 1, automatic: after taking the photo, click the (download) link to download; 2. Manual: After taking the photo, contact the seller to issue it or contact the official to find the developer to ship.
View details

How long is the trading cycle?

  • 1, the default transaction cycle of the source code: manual delivery of goods for 1-3 days, and the user payment amount will enter the platform guarantee until the completion of the transaction or 3-7 days can be issued, in case of disputes indefinitely extend the collection amount until the dispute is resolved or refunded!
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Matters needing attention

  • 1. Heptalon will permanently archive the process of trading between the two parties and the snapshots of the traded goods to ensure that the transaction is true, effective and safe! 2, Seven PAWS can not guarantee such as "permanent package update", "permanent technical support" and other similar transactions after the merchant commitment, please identify the buyer; 3, in the source code at the same time there is a website demonstration and picture demonstration, and the site is inconsistent with the diagram, the default according to the diagram as the dispute evaluation basis (except for special statements or agreement); 4, in the absence of "no legitimate basis for refund", the commodity written "once sold, no support for refund" and other similar statements, shall be deemed invalid; 5, before the shooting, the transaction content agreed by the two parties on QQ can also be the basis for dispute judgment (agreement and description of the conflict, the agreement shall prevail); 6, because the chat record can be used as the basis for dispute judgment, so when the two sides contact, only communicate with the other party on the QQ and mobile phone number left on the systemhere, in case the other party does not recognize self-commitment. 7, although the probability of disputes is very small, but be sure to retain such important information as chat records, mobile phone messages, etc., in case of disputes, it is convenient for seven PAWS to intervene in rapid processing.
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Systemhere declaration

  • 1. As a third-party intermediary platform, Qichou protects the security of the transaction and the rights and interests of both buyers and sellers according to the transaction contract (commodity description, content agreed before the transaction); 2, non-platform online trading projects, any consequences have nothing to do with mutual site; No matter the seller for any reason to require offline transactions, please contact the management report.
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