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angularx-qrcode - Angular QR Code Generator

angularx-qrcode - a fast and easy-to-use Ivy compatible Ionic and Angular QR Code Generator library

Features

  • Compatible with Angular and Ionic
  • Ivy compiler support, AOT, SSR (Server Side Rendering)
  • Under active development
  • Accessibility (a11y) attributes supported (alt, aria-label, title)
  • Support for images
  • Trusted and used by thousands of developers like you

angularx-qrcode is compatible with Ionic 3/4/5 and Angular 4/5/6/7/8/9/10/11/12/13/14/15+ with support for the Ivy compiler. It is a drop-in replacement for the no-longer-maintained angular component ng2-qrcode and based on node-qrcode.

Installation

Angular 15 and Ionic with angularx-qrcode 15

npm install angularx-qrcode --save
# Or with yarn
yarn add angularx-qrcode

Angular 14 and Ionic with angularx-qrcode 14

npm install angularx-qrcode@14.0.0 --save
# Or with yarn
yarn add angularx-qrcode@14.0.0

Angular 13 and Ionic with angularx-qrcode 13

npm install angularx-qrcode@13.0.15 --save
# Or with yarn
yarn add angularx-qrcode@13.0.15

Angular 12 and Ionic

npm install angularx-qrcode@12.0.3 --save
# Or with yarn
yarn add angularx-qrcode@12.0.3

Angular 11 and Ionic

npm install angularx-qrcode@11.0.0 --save
# Or with yarn
yarn add angularx-qrcode@11.0.0

Older supported angular versions

# angular 10 and Ionic
npm install angularx-qrcode@10.0.12 --save
# angular 9 and Ionic
npm install angularx-qrcode@~2.3.7 --save
# angular 8 and Ionic
npm install angularx-qrcode@~2.1.4 --save
# angular 5/6/7
npm install angularx-qrcode@1.6.4 --save
# Angular 4
npm install angularx-qrcode@1.0.3 --save

Usage

Import the module and add it to your imports section in your main AppModule:

// File: app.module.ts
// all your other imports...
import { QRCodeModule } from 'angularx-qrcode';

@NgModule({
declarations: [
  AppComponent
],
imports: [
  QRCodeModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
// File: app.component.html
// all your HTML...

<qrcode [qrdata]="'Your data string'" [width]="256" [errorCorrectionLevel]="'M'"></qrcode>

Examples

The source for a live angularx-qrcode demo app and more examples how to implement angularx-qrcode is in the folder projects/demo-app in this repository.

Generate a QR Code from a string (directive only)

Now that angular/Ionic know about the new QR Code module, let's invoke it from our template with a directive. If we use a simple text-string, we need no additional code in our controller.

<qrcode [qrdata]="'Your data string'" [width]="256" [errorCorrectionLevel]="'M'"></qrcode>

Create a QR Code from a variable in your controller

In addition to our <qrcode>-directive in app.component.html, lets add two lines of code to our controller app.component.ts.

// File: app.component.ts
export class QRCodeComponent {
  public myAngularxQrCode: string = null;
  constructor () {
    // assign a value
    this.myAngularxQrCode = 'Your QR code data string';
  }
}

// File: app.component.html
<qrcode [qrdata]="myAngularxQrCode" [width]="256" [errorCorrectionLevel]="'M'"></qrcode>

Download a QR Code

The online demo contains a working sample how to download the QR Code with a button.

Getting the QR Code URL

To download the QR Code, we have to use the qrCodeURL attribute of the <qrcode> which returns a sanitized URL representing the location of the QR Code.

// File: example.ts
export class QRCodeComponent {
  public myAngularxQrCode: string = "";
  public qrCodeDownloadLink: SafeUrl = "";

  constructor () {
    this.myAngularxQrCode = 'Your QR code data string';
  }

  onChangeURL(url: SafeUrl) {
    this.qrCodeDownloadLink = url;
  }
}

// File: example.html
<qrcode (qrCodeURL)="onChangeURL($event)" [qrdata]="myAngularxQrCode" [width]="256" [errorCorrectionLevel]="'M'"></qrcode>
<a [href]="qrCodeDownloadLink" download="qrcode">Download</a>

The file format obtained by qrCodeURL depends directly on the elementType of <qrcode>. If it's either canvas, url or image, it returns an image as .png, if it's svg, returns a .svg file.

Available Parameters

Attribute Type Default Description
allowEmptyString Boolean false Allow qrdata to be an empty string
alt String null HTML alt attribute (supported by img, url)
ariaLabel String null HTML aria-label attribute (supported by canvas, img, url)
colorDark String '#000000ff' RGBA color, color of dark module (foreground)
colorLight String '#ffffffff' RGBA color, color of light module (background)
cssClass String 'qrcode' CSS Class
elementType String 'canvas' 'canvas', 'svg', 'img', 'url' (alias for 'img')
errorCorrectionLevel String 'M' QR Correction level ('L', 'M', 'Q', 'H')
imageSrc String null Link to your image
imageHeight Number null height of your image
imageWidth Number null width of your image
margin Number 4 Define how much wide the quiet zone should be.
qrCodeURL EventEmitter<SafeUrl> Returns the QR Code URL
qrdata String '' String to encode
scale Number 4 Scale factor. A value of 1 means 1px per modules (black dots).
title String null HTML title attribute (supported by canvas, img, url)
version Number (auto) 1-40
width Number 10 Height/Width (any value)

QR Code capacity

Depending on the amount of data of the qrdata to encode, a minimum width is required.

Demo

Working online demo of Angular QR Code Generator

The source for the angular app is available in projects/demo-app. Run the command

ng serve demo-app --open

and open the url http://localhost:4200/ in your browser

AOT - Ahead Of Time Compilation

angularx-qrcode supports AOT Compilation (Ahead-of-Time Compilation) which results in significant faster rendering. An AOT-enabled module is included. Further reading: https://angular.io/guide/aot-compiler

SSR - Server Side Rendering

As of version 1.6.0, SSR support is fully implemented, the following workaround is no longer needed. HowTo use Angular QRCode with SSR

Contribute

  • Please open your PR against the development branch.
  • Make sure your editor uses prettier to minimize commited code changes.

License

MIT License

Copyright (c) 2018 - present Andreas Jacob (Cordobo.com)