How to generate QR code together with the image in a center (2024)

To generate a QR code with an image embedded in the center using Node.js, you can utilize the qrcode library along with canvas to achieve this. Here's a step-by-step guide on how to generate a QR code with an image in the center:

Step 1: Setup Node.js Project

First, initialize a Node.js project if you haven't already:

mkdir qr-code-generatorcd qr-code-generatornpm init -y

Step 2: Install Dependencies

Install the required libraries:

npm install qrcode canvas

• qrcode: Generates QR codes.
• canvas: Provides a canvas API for Node.js, which allows drawing and manipulating images.

Step 3: Create QR Code with Image

Create a script (generateQRWithImage.js, for example) to generate the QR code with an image in the center:

const QRCode = require('qrcode');const { createCanvas, loadImage } = require('canvas');const fs = require('fs');// Function to generate QR code with imageasync function generateQRWithImage(data, imagePath, outputFile) { try { // Generate QR code const qrCode = await QRCode.toDataURL(data, { errorCorrectionLevel: 'H' }); // Load image const image = await loadImage(imagePath); // Create canvas const canvas = createCanvas(300, 300); const ctx = canvas.getContext('2d'); // Draw QR code ctx.drawImage(await loadImage(qrCode), 0, 0, 300, 300); // Calculate position for the image in the center const centerX = (canvas.width - image.width) / 2; const centerY = (canvas.height - image.height) / 2; // Draw image in the center ctx.drawImage(image, centerX, centerY); // Save canvas to file const outputStream = fs.createWriteStream(outputFile); const stream = canvas.createPNGStream(); stream.pipe(outputStream); console.log(`QR code with image saved to ${outputFile}`); } catch (error) { console.error('Error generating QR code:', error); }}// Usage examplegenerateQRWithImage('https://example.com', 'logo.png', 'qr_with_logo.png');

Explanation

• QRCode.toDataURL: Generates a QR code as a data URL.
• loadImage: Loads images asynchronously using canvas.
• createCanvas: Creates a new canvas with specified dimensions (300x300 in this case).
• drawImage: Draws the QR code and image onto the canvas.
• createPNGStream: Creates a PNG stream from the canvas.
• pipe: Pipes the PNG stream to a writable file stream (outputStream).

Usage

Replace 'https://example.com' with your desired URL or data for the QR code, 'logo.png' with the path to your image file to be placed in the center, and 'qr_with_logo.png' with the desired output file path.

Additional Considerations

• Ensure that the image (logo.png in this case) is smaller than the dimensions of the QR code canvas to fit properly in the center.
• Adjust canvas dimensions (300x300 in this example) as per your requirements.

This script combines the QR code generation with the ability to overlay an image at the center using Node.js and the canvas library, suitable for generating customized QR codes with embedded logos or images.

Examples

1. Node.js QR code generation with an image centered:

   • Description: Generate a QR code image with an embedded logo or image centered in the QR code.
   • Code:

     const qr = require('qr-image');const fs = require('fs');const Jimp = require('jimp');// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Load logo/imageJimp.read('logo.png', (err, image) => { if (err) throw err; // Resize logo to fit within QR code image.resize(50, 50); // Composite logo/image in the center of QR code const qrWithLogo = qr.imageSync('Your QR Code Data', { type: 'png' }); image.composite(qrWithLogo, (image.bitmap.width - image.bitmap.width / 2) - (qrWithLogo.bitmap.width / 2), (image.bitmap.height - image.bitmap.height / 2) , 'xy'); image.write('qr_with_logo.png');});

2. Node.js QR code with embedded logo and centered positioning:

   • Description: Generate a QR code with a logo or image embedded and centered using QRCode and Jimp libraries.
   • Code:

     const QRCode = require('qrcode');const Jimp = require('jimp');const fs = require('fs');// Generate QR codeQRCode.toFile('qr.png', 'Your QR Code Data', { errorCorrectionLevel: 'H', width: 300, margin: 2}, function (err) { if (err) throw err; // Load logo/image Jimp.read('logo.png', function (err, image) { if (err) throw err; // Resize logo to fit within QR code image.resize(50, 50); // Calculate positioning for centering logo const x = (300 - image.bitmap.width) / 2; const y = (300 - image.bitmap.height) / 2; // Composite logo on QR code image.composite(image, x, y); image.write('qr_with_logo.png'); });});

3. Node.js QR code generation with image centering using qr-image and gm:

   • Description: Generate a QR code and center an image using qr-image and GraphicsMagick (gm) for Node.js.
   • Code:

     const qr = require('qr-image');const fs = require('fs');const gm = require('gm').subClass({ imageMagick: true });// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Load and resize imagegm('logo.png') .resize(50, 50) .write('resized_logo.png', function (err) { if (err) throw err; // Composite logo in the center of QR code gm() .command("composite") .in("-gravity", "center") .in("resized_logo.png") .in("qr.png") .write("qr_with_logo.png", function (err) { if (err) throw err; console.log('QR code with logo generated.'); }); });

4. Node.js QR code with centered image using qr-image and Canvas:

   • Description: Generate a QR code and center an image using qr-image and node-canvas for Node.js.
   • Code:

     const qr = require('qr-image');const fs = require('fs');const { createCanvas, loadImage } = require('canvas');// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Load and resize imageloadImage('logo.png').then(image => { const canvas = createCanvas(image.width, image.height); const ctx = canvas.getContext('2d'); ctx.drawImage(image, 0, 0, image.width, image.height); // Composite logo in the center of QR code ctx.drawImage(qr_png, (canvas.width - qr_png.width) / 2, (canvas.height - qr_png.height) / 2); fs.writeFileSync('qr_with_logo.png', canvas.toBuffer());});

5. Node.js QR code with logo centered using qr-image and Sharp:

   • Description: Generate a QR code and center an image using qr-image and Sharp image processing library.
   • Code:

     const qr = require('qr-image');const fs = require('fs');const sharp = require('sharp');// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Resize and composite logo in the center of QR codesharp('logo.png') .resize(50, 50) .toBuffer() .then(logoBuffer => { sharp('qr.png') .composite([{ input: logoBuffer, gravity: 'center' }]) .toFile('qr_with_logo.png', (err, info) => { if (err) throw err; console.log('QR code with logo generated.'); }); }) .catch(err => { console.error(err); });

6. Node.js QR code with logo centered using qr-image and ImageMagick:

   • Description: Generate a QR code and center an image using qr-image and ImageMagick (gm module).
   • Code:

     const qr = require('qr-image');const fs = require('fs');const gm = require('gm').subClass({ imageMagick: true });// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Resize and composite logo in the center of QR codegm('logo.png') .resize(50, 50) .gravity('Center') .composite('qr.png') .write('qr_with_logo.png', function (err) { if (!err) console.log('QR code with logo generated.'); });

7. Node.js QR code generation with logo centered using qr-image and Canvas:

   • Description: Generate a QR code and center an image using qr-image and Canvas API for Node.js.
   • Code:

     const qr = require('qr-image');const fs = require('fs');const { createCanvas, loadImage } = require('canvas');// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Load and resize imageloadImage('logo.png').then(image => { const canvas = createCanvas(image.width, image.height); const ctx = canvas.getContext('2d'); ctx.drawImage(image, 0, 0, image.width, image.height); // Composite logo in the center of QR code ctx.drawImage(qr_png, (canvas.width - qr_png.width) / 2, (canvas.height - qr_png.height) / 2); fs.writeFileSync('qr_with_logo.png', canvas.toBuffer());});

8. Node.js QR code generation with logo centered using qr-image and GraphicsMagick:

   • Description: Generate a QR code and center an image using qr-image and GraphicsMagick (gm module) for Node.js.
   • Code:

     const qr = require('qr-image');const fs = require('fs');const gm = require('gm').subClass({ imageMagick: true });// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Resize and composite logo in the center of QR codegm('logo.png') .resize(50, 50) .gravity('Center') .composite('qr.png') .write('qr_with_logo.png', function (err) { if (!err) console.log('QR code with logo generated.'); });

9. Node.js QR code with image centered using qr-image and ImageMagick:

   • Description: Generate a QR code and center an image using qr-image and ImageMagick (gm module).
   • Code:

     const qr = require('qr-image');const fs = require('fs');const gm = require('gm').subClass({ imageMagick: true });// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Resize and composite image in the center of QR codegm('logo.png') .resize(50, 50) .gravity('Center') .composite('qr.png') .write('qr_with_logo.png', function (err) { if (!err) console.log('QR code with logo generated.'); });

10. Node.js QR code generation with image centered using qr-image and Sharp:

    • Description: Generate a QR code and center an image using qr-image and Sharp image processing library.
    • Code:

      const qr = require('qr-image');const fs = require('fs');const sharp = require('sharp');// Generate QR codeconst qr_png = qr.imageSync('Your QR Code Data', { type: 'png' });fs.writeFileSync('qr.png', qr_png);// Resize and composite image in the center of QR codesharp('logo.png') .resize(50, 50) .composite([{ input: qr_png, gravity: 'center' }]) .toFile('qr_with_logo.png', (err, info) => { if (err) throw err; console.log('QR code with logo generated.'); });

More Tags

srcfeature-selectionzxingwildfly-10mime-typesdjango-modelswindows-explorerdynamic-resizinggoogle-cloud-firestoreword-style

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