qr-code.js

QRCode.js - Simple, Beautiful, Reliable

Create Beautiful, Reliable QR Codes with Ease

QRCode.js is a professional JavaScript/TypeScript library for creating customized QR codes, offering a blend of simplicity and sophistication. With versatile styling options—dot shapes, colors, gradients, embedded images, borders, and text—it enables you to design unique, visually appealing QR codes that work flawlessly with standard scanners. QRCode.js is part of QR-Platform: All-in-One QR Codes Management Solution.

✨ Features

Core QR Code Generation: Encode any text, URL, or data.
Highly Customizable: Control dot shapes, colors, sizes, corner styles, and background.
Gradients: Apply linear or radial gradients to dots, corners, and backgrounds.
Image Embedding: Embed logos or other images in the center, as an overlay, or as a background. Control image precedence with global QRCodeJs.setImage() or builder useImage(), both supporting an override option.
Borders: Add basic borders or advanced, customizable borders with text/images. Control text precedence with QRCodeJs.setText() or builder useText(), both supporting an override option.
Flexible Border Configuration: Set global border defaults (setBorder/setBorderId) or use the builder pattern (useBorder/useBorderId) for instance-specific borders.
Templates & Styles: Use predefined templates and styles, or create your own for consistent branding. Apply them globally with QRCodeJs.setTemplate() / QRCodeJs.setStyle() or per-instance with the builder’s useTemplate() / useStyle().
Comprehensive Configuration:
- Use QRCodeJs.setData(), QRCodeJs.setOptions(), and QRCodeJs.setSettings() for powerful global default configurations, with override options for strong precedence.
- Employ the builder pattern’s useData(), useOptions(), and useSettings() for instance-specific comprehensive setups, also with override capabilities. useSettings() resets prior builder steps to establish a new baseline.
Flexible Output: Generate QR codes as SVG elements in the browser or SVG strings in Node.js.
Download Options: Download QR codes as SVG, PNG, JPEG, or WEBP.
TypeScript Support: Fully typed for a better development experience.
Node.js Compatible: Works seamlessly in server-side environments.
Responsive: Option to make SVG output responsive to container size.
Scan Validation: Verify the scannability of generated QR codes.

🚀 Installation

NPM ⤵️

npm install @qr-platform/qr-code.js

YARN ⤵️

yarn add @qr-platform/qr-code.js

PNPM ⤵️

pnpm add @qr-platform/qr-code.js

💡 Basic Usage

import { QRCodeJs } from '@qr-platform/qr-code.js';

const qrCode = new QRCodeJs({ data: 'https://example.com' });
qrCode.append(document.getElementById('qr-container'));

or

import { QRCodeJs, Options } from '@qr-platform/qr-code.js';

// 1. Define options (only 'data' is required)
const options: Options = {
  data: 'https://example.com',
  width: 300,       // Fixed 300px width
  height: 300,      // Fixed 300px height
  dotsOptions: {
    color: '#007bff', // Blue dots
    type: 'rounded'   // Use rounded dots
  },
  backgroundOptions: {
    color: '#ffffff' // White background
  }
};

// 2. Create QR Code instance
const qrCode = new QRCodeJs(options);

// 3. Append to a container element (in browser)
const container = document.getElementById('qr-container');
if (container) {
  // Remove any existing content before appending the QR code
  qrCode.append(container, { clearContainer: true });
}

// Or get SVG string (Browser or Node.js)
qrCode.serialize().then(svgString => {
  if (svgString) {
    console.log('QR Code SVG:', svgString);
    // In Node.js, you might save this string to a file
    // require('fs').writeFileSync('qrcode.svg', svgString);
  }
});

⚙️ Key Options Overview

Option	Description	Example Value
`data`	Required. The content to encode.	`'Your URL here'`
`shape`	Overall shape (`'square'` or `'circle'`).	`'circle'`
`width`	QR code width (pixels/CSS units). Ignored when `isResponsive: true`.	`300` or `'20rem'`
`height`	QR code height (pixels/CSS units). Ignored when `isResponsive: true`.	`300` or `'20rem'`
`margin`	Quiet zone around the QR code (pixels).	`10`
`isResponsive`	Makes SVG responsive (100% width/height), ignoring `width`/`height`.	`true`
`qrOptions.errorCorrectionLevel`	Error correction (`'L'`, `'M'`, `'Q'`, `'H'`).	`'H'`
`dotsOptions.type`	Shape of the data dots (e.g., `rounded`, `dot`).	`'rounded'`
`dotsOptions.color`	Color of the data dots.	`'#ff5733'`
`dotsOptions.gradient`	Gradient for dots (see Gradients).	`{ type: 'linear', ... }`
`cornersSquareOptions`	Style for the large corner squares.	`{ type: 'dot', color: '#00ff00' }`
`cornersDotOptions`	Style for the small dots inside corners.	`{ type: 'square', color: '#ffffff' }`
`backgroundOptions`	Background style (color, roundness, gradient).	`{ color: '#f0f0f0', round: 0.2 }`
`image`	URL/Buffer/Blob of image to embed.	`'logo.png'`
`imageOptions`	Options for the embedded image (size, margin).	`{ imageSize: 0.3, margin: 2 }`
`borderOptions`	Options for decorative borders.	`{ hasBorder: true, thickness: 20, ... }`
`SettingsOptions`	Comprehensive object for `setSettings`/`useSettings`.	`{ templateId: '...', data: '...', ...}`

For a full list of options and detailed explanations of `SettingsOptions`, `setData`, `setOptions`, and their builder counterparts, see the API Reference Guide and Usage Guide.

🎨 Examples

Explore various configurations:

Basic Examples Get started with common use cases.
Advanced Examples Dive deep into customization possibilities.

🖥️ Node.js Usage

QRCode.js works in Node.js for server-side generation.

import { QRCodeJs, Options } from '@qr-platform/qr-code.js/node'; // Note the '/node' import
import fs from 'fs';

const options: Options = {
  data: 'https://example.com/from-node',
  dotsOptions: {
    color: '#8A2BE2' // BlueViolet
  }
};

const qrCode = new QRCodeJs(options);

qrCode.serialize().then(svgString => {
  if (svgString) {
    fs.writeFileSync('qrcode-node.svg', svgString);
    console.log('QR Code saved to qrcode-node.svg');
  }
});

Key Differences:

Import from @qr-platform/qr-code.js/node.
Methods requiring a DOM like append() or download() are not available. Use serialize() to get the SVG string.
Peer Dependencies: You must install the required peerDependencies for Node.js functionality.

Install automatically using npx:
```
 npx i-peers
```
Install manually using npm:
```
 npm i @xmldom/xmldom @undecaf/zbar-wasm image-size jose jimp @resvg/resvg-js file-type
```

📚 Documentation

Full Documentation: The main guide covering all features, options, and concepts.
API Reference: Detailed reference for all classes, methods, and types.
Usage Guide: Practical examples and explanations for common use cases.
Basic Examples: Simple examples to get started quickly.
Advanced Examples: Demonstrations of complex configurations and feature combinations.
Commercial Use: Information for commercial use of QRCode.js library.

📜 License and Support

QRCode.js by QR-Platform is free for personal projects, open-source projects, or general non-commercial use. For commercial use, a license is required.

See the full license at LICENSE.md for more information. For commercial licenses, including full source code and support, contact qr.platform.com@gmail.com.

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