QR Code Styling

# QR Code Styling [![Version](https://img.shields.io/npm/v/qr-code-styling.svg)](https://www.npmjs.org/package/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](https://www.npmjs.com/package/qr-border-plugin)

### Installation ``` npm install qr-code-styling ``` ### Usage ```HTML QR Code Styling

``` --- [**React example (Codesandbox)**](https://codesandbox.io/s/qr-code-styling-react-example-l8rwl?file=/src/App.js) [**Angular example (Codesandbox)**](https://codesandbox.io/s/agitated-panini-tpgb2?file=/src/app/app.component.ts) --- [**React example (source)**](https://github.com/kozakdenys/qr-code-styling-examples/tree/master/examples/react) [**Angular example (source)**](https://github.com/kozakdenys/qr-code-styling-examples/tree/master/examples/angular) [**Vue example (source)**](https://github.com/kozakdenys/qr-code-styling-examples/tree/master/examples/vue) [**Node.js example (source)**](https://github.com/kozakdenys/qr-code-styling-examples/tree/master/examples/nodejs) [**Next.js example (source)**](https://github.com/kozakdenys/qr-code-styling-examples/tree/master/examples/nextjs) --- ### 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 shape | string (`'square' 'circle')|`square` |The shape of the qr-code, circle shape adds rundom extra dots arround data | string | |The data 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"](https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/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' 'rounded' 'dots' 'classy' 'classy-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' 'rounded' 'dots' 'classy' 'classy-rounded' 'extra-rounded'`) | |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 ### 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](https://github.com/Automattic/node-canvas#compiling). 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. ```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); }); ``` ### License [MIT License](https://raw.githubusercontent.com/kozakdenys/qr-code-styling/master/LICENSE). Copyright (c) 2021 Denys Kozak

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