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QR Code Styling

Version

JavaScript library for generating QR codes with a logo and styling.

Try it here https://qr-code-styling.com

If you have issues / suggestions / notes / questions, please open an issue or contact me. Let's create a cool library together.

Examples

Installation

npm install qr-code-styling

Usage

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>QR Code Styling</title>
    <script type="text/javascript" src="https://unpkg.com/qr-code-styling@1.5.0/lib/qr-code-styling.js"></script>
</head>
<body>
<div id="canvas"></div>
<script type="text/javascript">

    const qrCode = new QRCodeStyling({
        width: 300,
        height: 300,
        type: "svg",
        data: "https://www.facebook.com/",
        image: "https://upload.wikimedia.org/wikipedia/commons/5/51/Facebook_f_logo_%282019%29.svg",
        dotsOptions: {
            color: "#4267b2",
            type: "rounded"
        },
        backgroundOptions: {
            color: "#e9ebee",
        },
        imageOptions: {
            crossOrigin: "anonymous",
            margin: 20
        }
    });

    qrCode.append(document.getElementById("canvas"));
    qrCode.download({ name: "qr", extension: "svg" });
</script>
</body>
</html>

React example (Codesandbox)

Angular example (Codesandbox)

React example (source)

Angular example (source)

Vue example (source)

API Documentation

QRCodeStyling instance

new QRCodeStyling(options) => QRCodeStyling

Param Type Description
options object Init object

options structure

Property Type Default Value Description
width number 300 Size of canvas
height number 300 Size of canvas
type string ('canvas' 'svg') canvas The type of the element that will be rendered
data string The date will be encoded to the QR code
image string The image will be copied to the center of the QR code
margin number 0 Margin around canvas
qrOptions object Options will be passed to qrcode-generator lib
imageOptions object Specific image options, details see below
dotsOptions object Dots styling options
cornersSquareOptions object Square in the corners styling options
cornersDotOptionsHelper object Dots in the corners styling options
backgroundOptions object QR background styling options

options.qrOptions structure

Property Type Default Value
typeNumber number (0 - 40) 0
mode string ('Numeric' 'Alphanumeric' 'Byte' 'Kanji')
errorCorrectionLevel string ('L' 'M' 'Q' 'H') 'Q'

options.imageOptions structure

Property Type Default Value Description
hideBackgroundDots boolean true Hide all dots covered by the image
imageSize number 0.4 Coefficient of the image size. Not recommended to use ove 0.5. Lower is better
margin number 0 Margin of the image in px
crossOrigin string('anonymous' 'use-credentials') Set "anonymous" if you want to download QR code from other origins.

options.dotsOptions structure

Property Type Default Value Description
color string '#000' Color of QR dots
gradient object Gradient of QR dots
type string ('rounded' 'dots' 'classy' 'classy-rounded' 'square' 'extra-rounded') 'square' Style of QR dots

options.backgroundOptions structure

Property Type Default Value
color string '#fff'
gradient object

options.cornersSquareOptions structure

Property Type Default Value Description
color string Color of Corners Square
gradient object Gradient of Corners Square
type string ('dot' 'square' 'extra-rounded') Style of Corners Square

options.cornersDotOptions structure

Property Type Default Value Description
color string Color of Corners Dot
gradient object Gradient of Corners Dot
type string ('dot' 'square') Style of Corners Dot

Gradient structure

options.dotsOptions.gradient

options.backgroundOptions.gradient

options.cornersSquareOptions.gradient

options.cornersDotOptions.gradient

Property Type Default Value Description
type string ('linear' 'radial') "linear" Type of gradient spread
rotation number 0 Rotation of gradient in radians (Math.PI === 180 degrees)
colorStops array of objects Gradient colors. Example [{ offset: 0, color: 'blue' }, { offset: 1, color: 'red' }]

Gradient colorStops structure

options.dotsOptions.gradient.colorStops[]

options.backgroundOptions.gradient.colorStops[]

options.cornersSquareOptions.gradient.colorStops[]

options.cornersDotOptions.gradient.colorStops[]

Property Type Default Value Description
offset number (0 - 1) Position of color in gradient range
color string Color of stop in gradient range

QRCodeStyling methods

QRCodeStyling.append(container) => void

Param Type Description
container DOM element This container will be used for appending of the QR code

QRCodeStyling.getRawData(extension) => Promise<Blob>

Param Type Default Value Description
extension string ('png' 'jpeg' 'webp' 'svg') 'png' Blob type

QRCodeStyling.update(options) => void

Param Type Description
options object The same options as for initialization

QRCodeStyling.applyExtension(extension) => void

Param Type Description
extension (svg, options) => void Extension is a function that takes svg and previously applied options and modifies an svg

applyExtension example

const extension = (svg, options) => {
    const { width, height } = options;
    const size = Math.min(width, height);
    const border = document.createElementNS("http://www.w3.org/2000/svg", "rect");
    const borderAttributes = {
        "fill": "none",
        "x": (width - size + 40) / 2,
        "y": (height - size + 40) / 2,
        "width": size - 40,
        "height": size - 40,
        "stroke": 'black',
        "stroke-width": 40,
        "rx": 100,
    };
    Object.keys(borderAttributes).forEach(attribute => {
      border.setAttribute(attribute, borderAttributes[attribute]);
    });
    svg.appendChild(border);
};

QRCodeStyling.deleteExtension() => void

QRCodeStyling.download(downloadOptions) => Promise<void>

Param Type Description
downloadOptions object Options with extension and name of file (not required)

downloadOptions structure

Property Type Default Value Description
name string 'qr' Name of the downloaded file
extension string ('png' 'jpeg' 'webp' 'svg') 'png' File extension

Building this repo

If you get an error running npm install referring to node-pre-gyp, this is caused by an attempt to compile the canvas dependency. See Compiling instructions in the README. For example on MacOS you need to install dependencies: brew install pkg-config cairo pango libpng jpeg giflib librsvg pixman.

Currently this repo will not build (npm run build) on Node v18, recommended version is v16. See https://stackoverflow.com/q/69692842/1375972

License

MIT License. Copyright (c) 2021 Denys Kozak