jsqr vs qr-image vs qr.js vs qrious vs react-qr-code
QR Code Libraries
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QR Code Libraries

QR code libraries in JavaScript provide tools for generating and reading QR codes. These libraries can be used in web applications to create QR codes for URLs, text, or other data, as well as to scan and decode QR codes using a device's camera. They are useful for a variety of applications, including payment systems, marketing, and data sharing. jsqr is a fast and lightweight QR code scanner library that can decode QR codes from images or video streams. qr-image is a Node.js library for generating QR code images in various formats, such as PNG, SVG, and PDF. qr.js is a simple and lightweight library for generating QR codes in the browser using JavaScript. qrious is a feature-rich library for creating QR codes with customizable options, such as size, colors, and error correction levels. react-qr-code is a React component for generating QR codes in React applications, allowing for easy integration and customization.

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Package
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jsqr04,004-965 years agoApache-2.0
qr-image01,063-159 years agoMIT
qr.js0---13 years agoMIT
qrious01,626-439 years agoGPL-3.0
react-qr-code087013.8 kB159 months agoMIT

Feature Comparison: jsqr vs qr-image vs qr.js vs qrious vs react-qr-code

Scanning

  • jsqr:

    jsqr is designed for scanning QR codes from images or video streams. It is optimized for performance and can decode QR codes quickly, making it suitable for real-time applications.

  • qr-image:

    qr-image does not support scanning; it is focused on generating QR code images.

  • qr.js:

    qr.js does not support scanning; it is a library for generating QR codes only.

  • qrious:

    qrious does not support scanning; it is a library for generating QR codes with customizable options.

  • react-qr-code:

    react-qr-code does not support scanning; it is a React component for generating QR codes.

Generation

  • jsqr:

    jsqr does not support QR code generation; it is focused on scanning and decoding QR codes.

  • qr-image:

    qr-image is a powerful library for generating QR code images in various formats, including PNG, SVG, and PDF. It is suitable for server-side applications that need to create QR codes dynamically.

  • qr.js:

    qr.js is a simple and lightweight library for generating QR codes in the browser. It creates QR codes using pure JavaScript and does not rely on any external dependencies.

  • qrious:

    qrious is a feature-rich QR code generator that allows for customization of the QR code's appearance, including size, colors, and error correction levels. It is suitable for applications that need more control over the design of the QR codes.

  • react-qr-code:

    react-qr-code is a React component that generates QR codes based on the data provided through props. It is easy to use and integrates seamlessly with React applications.

Customization

  • jsqr:

    jsqr does not offer customization options as it is focused on scanning QR codes.

  • qr-image:

    qr-image allows for some customization of the generated QR codes, such as setting the size and margin. However, it does not provide advanced customization features.

  • qr.js:

    qr.js offers basic customization options for the generated QR codes, such as setting the size and color. It is a simple library without advanced customization features.

  • qrious:

    qrious provides extensive customization options for QR code generation, including setting the size, colors, and error correction levels. It is ideal for applications that require more control over the appearance of the QR codes.

  • react-qr-code:

    react-qr-code allows for customization of the QR code's size and colors through props. It is designed to be simple and easy to use within React applications.

Integration

  • jsqr:

    jsqr can be easily integrated into web applications for real-time QR code scanning. It works well with HTML5 video elements and can be used in conjunction with other libraries for a complete scanning solution.

  • qr-image:

    qr-image is designed for server-side integration with Node.js applications. It can be used to generate QR codes dynamically based on user input or other data.

  • qr.js:

    qr.js is a lightweight library that can be easily integrated into web applications for client-side QR code generation. It does not have any dependencies, making it easy to include in projects.

  • qrious:

    qrious can be integrated into web applications for QR code generation with customizable options. It is a standalone library that does not have any dependencies.

  • react-qr-code:

    react-qr-code is specifically designed for React applications, making it easy to integrate and use within React components.

Ease of Use: Code Examples

  • jsqr:

    Scanning QR codes with jsqr

    import jsQR from 'jsqr';
const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
const code = jsQR(imageData.data, imageData.width, imageData.height);
if (code) {
  console.log('QR Code Data:', code.data);
}
  • qr-image:

    Generating QR code images with qr-image

    const qr = require('qr-image');
const svg = qr.image('Hello, World!', { type: 'svg' });
svg.pipe(require('fs').createWriteStream('qr.svg'));
  • qr.js:

    Generating QR codes with qr.js

    import QRCode from 'qr.js';
const qr = new QRCode('Hello, World!');
const canvas = document.getElementById('qr-canvas');
const context = canvas.getContext('2d');
// Render QR code on canvas
  • qrious:

    Customizing QR codes with qrious

    import { Qrious } from 'qrious';
const qr = new Qrious({
  element: document.getElementById('qr'),
  value: 'Hello, World!',
  size: 200,
  background: '#ffffff',
  foreground: '#000000',
});
  • react-qr-code:

    Using react-qr-code in React

    import QRCode from 'react-qr-code';
const MyComponent = () => (
  <QRCode value="Hello, World!" size={128} />
);

How to Choose: jsqr vs qr-image vs qr.js vs qrious vs react-qr-code

  • jsqr:

    Choose jsqr if you need a fast and efficient library for scanning QR codes from images or video streams. It is ideal for applications that require real-time QR code scanning with minimal resource usage.

  • qr-image:

    Choose qr-image if you need to generate QR code images on the server side using Node.js. It supports multiple output formats and is suitable for applications that require dynamic QR code generation.

  • qr.js:

    Choose qr.js if you need a lightweight and simple library for generating QR codes in the browser. It is easy to use and does not have any dependencies, making it ideal for small projects.

  • qrious:

    Choose qrious if you need a more advanced QR code generator with customizable options. It allows you to set colors, sizes, and error correction levels, making it suitable for applications that require more control over the appearance of the QR codes.

  • react-qr-code:

    Choose react-qr-code if you are building a React application and need a simple way to generate QR codes as React components. It is easy to integrate and allows for customization through props.

Similar Npm Packages to jsqr

jsqr is a JavaScript library designed for decoding QR codes from images or video streams. It is lightweight and efficient, making it suitable for web applications that require QR code scanning capabilities. With jsqr, developers can easily integrate QR code scanning functionality into their projects, allowing users to quickly read and process QR codes using their device's camera or uploaded images.

While jsqr is a solid choice for QR code scanning, there are several alternatives available that offer similar functionalities. Here are a few notable options:

  • html5-qrcode is a comprehensive library that provides a simple interface for scanning QR codes using the device's camera. It supports both desktop and mobile browsers and is designed to work seamlessly with HTML5. With features like real-time scanning and customizable UI elements, html5-qrcode is an excellent choice for developers looking to implement QR code scanning in their web applications without much hassle.

  • qr-scanner is another lightweight library focused on QR code scanning. It utilizes the device's camera to scan QR codes in real-time and is optimized for performance. qr-scanner is easy to set up and use, making it a great option for developers who want a straightforward solution for QR code scanning without additional dependencies.

  • qrcode-reader is a library that allows for reading QR codes from images. It is built on top of the popular jsQR library and provides a simple API for decoding QR codes from image files. If your application requires reading QR codes from static images rather than real-time scanning, qrcode-reader is a suitable alternative.

For a comprehensive comparison of these packages, check out the following link: Comparing html5-qrcode vs jsqr vs qr-scanner vs qrcode-reader.

Similar Npm Packages to qr-image

qr-image is a popular npm package used for generating QR codes in Node.js applications. It allows developers to create QR codes in various formats, including PNG, SVG, and PDF, making it versatile for different use cases. With its simple API, qr-image is an excellent choice for applications that require quick and easy QR code generation.

While qr-image is a solid option, there are other libraries in the ecosystem that provide similar functionality. Here are a few alternatives:

  • qr.js is a lightweight JavaScript library for generating QR codes. It focuses on simplicity and performance, providing a straightforward API for creating QR codes directly in the browser or in Node.js. qr.js is particularly useful for developers looking for a minimalistic approach to QR code generation without the need for additional features or formats. Its small footprint makes it a great choice for projects where bundle size is a concern.
  • qrcode is another widely used library for generating QR codes in both Node.js and the browser. It offers a rich set of features, including support for different error correction levels, various output formats, and customization options such as color and size. qrcode is ideal for developers who need more control over the appearance and functionality of their QR codes. Its flexibility makes it suitable for a wide range of applications, from simple QR code generation to more complex use cases.

To see how qr-image compares with qr.js and qrcode, check out the comparison: Comparing qr-image vs qr.js vs qrcode.

Similar Npm Packages to qr.js

qr.js is a JavaScript library designed for generating QR codes in web applications. It provides a simple and efficient way to create QR codes from text or URLs, making it a popular choice for developers looking to integrate QR code functionality into their projects. While qr.js offers a robust solution for QR code generation, there are several alternatives available in the ecosystem that cater to different needs. Here are a few noteworthy options:

  • jsqr is a library focused on QR code scanning rather than generation. It allows developers to decode QR codes from images or video streams, making it ideal for applications that require real-time scanning capabilities. If your project involves reading QR codes, jsqr is a powerful tool that can handle various QR code formats and sizes efficiently.
  • qr-image is a Node.js library that generates QR codes in various formats, including PNG, SVG, and PDF. It is particularly useful for server-side applications where you want to generate QR codes dynamically and serve them as images. If you need a straightforward solution for generating QR codes on the server, qr-image is a solid choice.
  • qrious is a lightweight library that provides a simple API for generating QR codes in the browser. It supports rendering QR codes on HTML5 canvas elements and offers customization options for size and color. If you are looking for a minimalistic solution to generate QR codes directly in the browser, qrious is an excellent option.
  • react-qr-code is a React component that simplifies the process of generating QR codes within React applications. It allows developers to easily create QR codes as part of their React components, making it a convenient choice for React developers who want to integrate QR code functionality seamlessly into their applications.

To explore how these libraries compare, check out the following link: Comparing jsqr vs qr-image vs qr.js vs qrious vs react-qr-code.

Similar Npm Packages to qrious

qrious is a JavaScript library that allows developers to generate QR codes easily and efficiently. It provides a simple API for creating QR codes in various formats, making it a popular choice for applications that require QR code generation. While qrious is a great tool for QR code generation, there are other libraries that offer similar functionalities or cater to different needs in the realm of graphics and data visualization. Here are some alternatives:

  • canvas is a powerful library that provides a Canvas API for Node.js, allowing developers to create and manipulate images and graphics programmatically. It is particularly useful for server-side rendering of graphics and can be used to generate complex images, including charts and other visual representations. If you need more control over graphics rendering or want to create custom images beyond QR codes, canvas is an excellent choice.
  • chart.js is a popular library for creating interactive and responsive charts in web applications. It provides a wide range of chart types and is highly customizable, making it suitable for visualizing data in various formats. While chart.js is focused on charting rather than QR code generation, it is a great alternative if your application requires data visualization alongside QR code functionality.
  • d3 is a powerful JavaScript library for producing dynamic, interactive data visualizations in web browsers. It uses HTML, SVG, and CSS to bring data to life, allowing developers to create complex visualizations and manipulate the DOM based on data. Like chart.js, d3 is not specifically for QR code generation, but it is an excellent choice for applications that require advanced data visualization capabilities.
  • html2canvas is a library that allows developers to take "screenshots" of web pages or specific DOM elements and convert them into canvas elements. This can be useful for capturing visual representations of web content, including QR codes generated by other libraries. If you need to create images of your web content, including QR codes, html2canvas can complement your existing tools.

To see how qrious compares with canvas, chart.js, d3, and html2canvas, check out the comparison: Comparing canvas vs chart.js vs d3 vs html2canvas vs qrious.

Similar Npm Packages to react-qr-code

react-qr-code is a React component that allows developers to easily generate QR codes in their applications. This library is lightweight and straightforward to use, making it ideal for projects that require QR code generation without the need for complex configurations. With react-qr-code, you can customize the size, style, and data encoded in the QR code, providing flexibility for various use cases, such as creating QR codes for URLs, contact information, or any other text data.

While react-qr-code is a great option for generating QR codes, there are alternatives available for different functionalities. One notable alternative is:

  • react-qr-reader. This library focuses on reading QR codes rather than generating them. It provides a React component that utilizes the device's camera to scan QR codes in real-time. react-qr-reader is perfect for applications that need to read QR codes, such as mobile apps for ticketing, payment processing, or inventory management. With its easy-to-use interface, developers can quickly integrate QR code scanning capabilities into their applications.

For a comprehensive comparison of these two packages, you can visit: Comparing react-qr-code vs react-qr-reader.

README for jsqr

jsQR

Build Status

A pure javascript QR code reading library. This library takes in raw images and will locate, extract and parse any QR code found within.

Demo

Installation

NPM

Available on npm. Can be used in a Node.js program or with a module bundler such as Webpack or Browserify.

npm install jsqr --save

// ES6 import
import jsQR from "jsqr";

// CommonJS require
const jsQR = require("jsqr");

jsQR(...);

Browser

Alternatively for frontend use jsQR.js can be included with a script tag

<script src="jsQR.js"></script>
<script>
  jsQR(...);
</script>

A note on webcams

jsQR is designed to be a completely standalone library for scanning QR codes. By design it does not include any platform specific code. This allows it to just as easily scan a frontend webcam stream, a user uploaded image, or be used as part of a backend Node.js process.

If you want to use jsQR to scan a webcam stream you'll need to extract the ImageData from the video stream. This can then be passed to jsQR. The jsQR demo contains a barebones implementation of webcam scanning that can be used as a starting point and customized for your needs. For more advanced questions you can refer to the getUserMedia docs or the fairly comprehensive webRTC sample code, both of which are great resources for consuming a webcam stream.

Usage

jsQR exports a method that takes in 3 arguments representing the image data you wish to decode. Additionally can take an options object to further configure scanning behavior.

const code = jsQR(imageData, width, height, options?);

if (code) {
  console.log("Found QR code", code);
}

Arguments

  • imageData - An Uint8ClampedArray of RGBA pixel values in the form [r0, g0, b0, a0, r1, g1, b1, a1, ...]. As such the length of this array should be 4 * width * height. This data is in the same form as the ImageData interface, and it's also commonly returned by node modules for reading images.
  • width - The width of the image you wish to decode.
  • height - The height of the image you wish to decode.
  • options (optional) - Additional options.
    • inversionAttempts - (attemptBoth (default), dontInvert, onlyInvert, or invertFirst) - Should jsQR attempt to invert the image to find QR codes with white modules on black backgrounds instead of the black modules on white background. This option defaults to attemptBoth for backwards compatibility but causes a ~50% performance hit, and will probably be default to dontInvert in future versions.

Return value

If a QR is able to be decoded the library will return an object with the following keys.

  • binaryData - Uint8ClampedArray - The raw bytes of the QR code.
  • data - The string version of the QR code data.
  • chunks - The QR chunks.
  • version - The QR version.
  • location - An object with keys describing key points of the QR code. Each key is a point of the form {x: number, y: number}. Has points for the following locations.
    • Corners - topRightCorner/topLeftCorner/bottomRightCorner/bottomLeftCorner;
    • Finder patterns - topRightFinderPattern/topLeftFinderPattern/bottomLeftFinderPattern
    • May also have a point for the bottomRightAlignmentPattern assuming one exists and can be located.

Because the library is written in typescript you can also view the type definitions to understand the API.

Contributing

jsQR is written using typescript. You can view the development source in the src directory.

Tests can be run with

npm test

Besides unit tests the test suite contains several hundred images that can be found in the /tests/end-to-end/ folder.

Not all the images can be read. In general changes should hope to increase the number of images that read. However due to the nature of computer vision some changes may cause images that pass to start to fail and visa versa. To update the expected outcomes run npm run-script generate-test-data. These outcomes can be evaluated in the context of a PR to determine if a change improves or harms the overall ability of the library to read QR codes. A summary of which are passing and failing can be found at /tests/end-to-end/report.json

After testing any changes, you can compile the production version by running

npm run-script build

Pull requests are welcome! Please create seperate branches for seperate features/patches.

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