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.

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If you would like to use additional stiles, you can connect extensions.
#### qr-border-plugin

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``
npm install qr-code-styling
`

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`HTML














`
---

React example (Codesandbox)

Angular example (Codesandbox)

---

React example (source)

Angular example (source)

Vue example (source)

Node.js example (source)

Next.js example (source)

---

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#### 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

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

`JS
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

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


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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.

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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.

`js
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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MIT License. Copyright (c) 2021 Denys Kozak