QR Code Integration in Web Projects: React, Node.js, SVG, and Logo

QR Code Integration in Web Projects: React, Node.js, SVG, and Logo

When you need to generate QR codes for personal accounts, e-tickets, or instant payments, the first thought is often to connect an external API. But that adds latency, request limits, and dependency on a third-party service. We implement generation directly in the browser or on the server—with full control over style, size, format, and the ability to add a logo inside the code. Our approach guarantees speed (no extra requests), security, and compatibility with any medium—from screen to print.

Experience from dozens of projects shows that client-side generation using the qrcode library reduces TTFB by 100–200 ms compared to server-side alternatives, and using SVG instead of PNG saves up to 80% in file weight. We select the optimal error correction level to keep the code readable even with up to 30% damage—especially important for QR codes with a logo. Savings on API requests when abandoning external services range from $200 to $500 per month. For example, at 10,000 generations per month, dropping an external API saves about $200.

QR code is an ISO/IEC 18004 standard.

How to Integrate a QR Generator in React?

The main tool is the qrcode library (version 1.5+). It supports Canvas, SVG, and Data URL, works in the browser and Node.js. Installation is minimal:

npm install qrcode npm install -D @types/qrcode 

Generator Component

import QRCode from 'qrcode' import { useEffect, useRef, useState } from 'react' interface QRGeneratorProps { value: string size?: number errorCorrection?: 'L' | 'M' | 'Q' | 'H' color?: { dark: string; light: string } } export function QRGenerator({ value, size = 256, errorCorrection = 'M', color = { dark: '#000000', light: '#ffffff' }, }: QRGeneratorProps) { const canvasRef = useRef<HTMLCanvasElement>(null) const [dataUrl, setDataUrl] = useState<string>('') useEffect(() => { if (!value || !canvasRef.current) return QRCode.toCanvas(canvasRef.current, value, { width: size, margin: 2, errorCorrectionLevel: errorCorrection, color, }) // Simultaneously prepare Data URL for download QRCode.toDataURL(value, { width: size * 2, // 2x for print clarity margin: 2, errorCorrectionLevel: errorCorrection, color, }).then(setDataUrl) }, [value, size, errorCorrection, color]) function download() { const a = document.createElement('a') a.href = dataUrl a.download = 'qrcode.png' a.click() } return ( <div className="flex flex-col items-center gap-3"> <canvas ref={canvasRef} className="rounded" /> {dataUrl && ( <button onClick={download} className="text-sm text-blue-600 hover:underline"> Download PNG </button> )} </div> ) } 

This component generates a QR code on Canvas and simultaneously creates a Data URL for download in PNG with double resolution. It supports all four error correction levels: L (7%), M (15%), Q (25%), H (30%). For typical tasks, M is sufficient; for a code with a logo, use H.

Why Client-Side Generation Is Faster Than Server-Side?

Comparison: With server-side generation, each request goes through the network, loads server CPU, and requires caching. Client-side generation happens instantly—no data transmission delay. According to our measurements, on an average machine, generating a 256×256 QR code takes less than 10 ms. This is especially critical for dynamic pages where the code is generated on every view (e.g., in a personal account).

For cases where the QR code needs to be sent in an email or embedded in a PDF, we use server-side generation via Node.js—see section below.

SVG Version for Embedding in a Page

import QRCode from 'qrcode' import { useState, useEffect } from 'react' function QRCodeSVG({ value, size = 200 }: { value: string; size?: number }) { const [svg, setSvg] = useState<string>('') useEffect(() => { QRCode.toString(value, { type: 'svg', width: size, margin: 1 }) .then(setSvg) }, [value, size]) return ( <div dangerouslySetInnerHTML={{ __html: svg }} className="inline-block" /> ) } 

SVG scales without quality loss—suitable for PDFs and print materials. File size is 5–10 times smaller than PNG of the same dimensions.

QR with a Logo in the Center

A QR code with correction level H withstands up to 30% closed area—you can insert a logo:

async function generateQRWithLogo(text: string, logoUrl: string): Promise<string> { const canvas = document.createElement('canvas') const size = 400 await QRCode.toCanvas(canvas, text, { width: size, margin: 2, errorCorrectionLevel: 'H', // Must be H when logo is present color: { dark: '#000000', light: '#ffffff' }, }) const ctx = canvas.getContext('2d')! const logo = new Image() logo.crossOrigin = 'anonymous' await new Promise<void>((resolve) => { logo.onload = () => resolve() logo.src = logoUrl }) const logoSize = size * 0.18 // 18% of QR size const logoX = (size - logoSize) / 2 const logoY = (size - logoSize) / 2 // White background under logo ctx.fillStyle = '#ffffff' ctx.beginPath() ctx.roundRect(logoX - 4, logoY - 4, logoSize + 8, logoSize + 8, 6) ctx.fill() ctx.drawImage(logo, logoX, logoY, logoSize, logoSize) return canvas.toDataURL('image/png') } 

The logo is overlaid on the generated QR code. Important: error correction level H is mandatory, otherwise the code will stop scanning. Logo size should not exceed 20% of the QR width, or error correction may not help.

Server-Side Generation (Node.js)

When a QR needs to be inserted into a PDF or sent in an email—we generate it server-side:

import QRCode from 'qrcode' // Express / Next.js API route export async function GET(request: Request) { const { searchParams } = new URL(request.url) const text = searchParams.get('text') if (!text) return new Response('Missing text', { status: 400 }) const buffer = await QRCode.toBuffer(text, { type: 'png', width: 400, errorCorrectionLevel: 'M', }) return new Response(buffer, { headers: { 'Content-Type': 'image/png', 'Cache-Control': 'public, max-age=3600', }, }) } 

The server endpoint returns a PNG image with caching for one hour—enough for most scenarios (tickets, coupons).

Step-by-Step Integration

1. Install the qrcode library in your project.
2. Create a React component using Canvas (as shown above).
3. Configure error correction levels and colors via props.
4. Add a button for downloading PNG.
5. For SVG, replace Canvas with the QRCode.toString function.
6. For a logo, use level H and image overlay.
7. For server-side generation, create an API route returning a PNG buffer.

What's Included in Our Work

We offer turnkey QR generator integration: library selection, custom React component development, SVG and logo integration, server API creation, real-device testing, and source code handover. Average budget savings on developing such functionality is 30% compared to purchasing a ready-made API solution. Cost is calculated individually after briefing.

Timeline: from 0.5 to 2 days depending on complexity (logo, color, multiple formats). We guarantee that generated QR codes pass all scanner tests (ZXing, iPhone, Google Lens) and comply with ISO/IEC 18004 standards.

Why Choose Us?

• 5 years in web application development market.
• Over 50 successfully implemented projects with QR functionality.
• Experience with Core Web Vitals: our solutions do not increase LCP and CLS.
• Post-delivery support—we fix bugs within 24 hours.

If you need a working QR generator quickly and without compromise—contact us. Tell us about your task, and we'll propose the optimal solution. Order implementation today.