qr-code-styling

v1.8.4

Published

a month ago

Add a style and an image to your QR code

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denys_kozak

qr qrcode qr-code js qrjs qrstyling styling qrbranding branding qrimage image qrlogo logo design

QR Code Styling

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

Extensions

If you would like to use additional stiles, you can connect extensions.

qr-border-plugin

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/[email protected]/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)

Node.js example (source)

Next.js 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 cornersDotOptions |object | |Dots in the corners styling options backgroundOptions |object | |QR background styling options nodeCanvas |node-canvas | |Only specify when running on a node server for canvas type, please refer to node section below jsDom |jsdom | |Only specify when running on a node server for svg type, please refer to node section below

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. saveAsBlob |boolean | true |Saves image as base64 blob in svg type, see bellow

When QR type is svg, the image may not load in certain applications as it is saved as a url, and some svg applications will not render url images for security reasons. Setting saveAsBlob to true will instead save the image as a blob, allowing it to render correctly in more places, but will also increase the file size.

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 roundSize| boolean | true |Whether to round dots size to integer. true value might create extra margin around qr code. If false, shape-rendering="crispEdges" will be applied to SVG element.

options.backgroundOptions structure

Property|Type |Default Value --------|--------------------------------------------------|------------- color |string ('#fff' 'rgb(255,255,255)' 'transparent')|'#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 on browser, Buffer type on Node

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)

Promise returned will resolve into the data URI of the QR code image.

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.

Node Support

You can use this on a node server by passing through the node-canvas or jsdom object depending if your creating a non-svg or svg respectively. You must pass both if using imageOptions.saveAsBlob.

Calling getRawData in node will return a Buffer instead of a Blob.

const { QRCodeStyling } = require("qr-code-styling/lib/qr-code-styling.common.js");
const nodeCanvas = require("canvas");
const { JSDOM } = require("jsdom");
const fs = require("fs");

const options = {
    width: 300,
    height: 300,
    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
    }
}

// For canvas type
const qrCodeImage = new QRCodeStyling({
    jsdom: JSDOM, // this is required
    nodeCanvas, // this is required,
    ...options,
    imageOptions: {
        saveAsBlob: true,
        crossOrigin: "anonymous",
        margin: 20
    },
});

qrCodeImage.getRawData("png").then((buffer) => {
  fs.writeFileSync("test.png", buffer);
});

// For svg type
const qrCodeSvg = new QRCodeStyling({
    jsdom: JSDOM, // this is required
    type: "svg",
    ...options
});

qrCodeSvg.getRawData("svg").then((buffer) => {
  fs.writeFileSync("test.svg", buffer);
});

// For svg type with the inner-image saved as a blob
// (inner-image will render in more places but file will be larger)
const qrCodeSvgWithBlobImage = new QRCodeStyling({
    jsdom: JSDOM, // this is required
    nodeCanvas, // this is required
    type: "svg",
    ...options,
    imageOptions: {
        saveAsBlob: true,
        crossOrigin: "anonymous",
        margin: 20
    }
});

qrCodeSvgWithBlobImage.getRawData("svg").then((buffer) => {
  fs.writeFileSync("test_blob.svg", buffer);
});

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