angularx-qrcode - Angular QR Code Generator

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

• Features
• Installation
• Demo App
• Usage & Example Implementations
• Available Parameters
• Contribute
• Sponsoring
• License

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 3/4/5/6/7/8 and Angular 4/5/6/7/8/9/10/11/12/13/14/15/16/17/18+ 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 18 and Ionic with angularx-qrcode 18

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

Angular 17 and Ionic with angularx-qrcode 17

npm install [email protected] --save
# Or with yarn
yarn add [email protected]

Angular 16 and Ionic with angularx-qrcode 16

npm install [email protected] --save
# Or with yarn
yarn add [email protected]

Older supported angular versions

# angular 15 and Ionic
npm install [email protected] --save
# angular 14 and Ionic
npm install [email protected] --save
# angular 13 and Ionic
npm install [email protected] --save
# angular 12 and Ionic
npm install [email protected] --save
# angular 11 and Ionic
npm install [email protected] --save
# angular 10 and Ionic
npm install [email protected] --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 [email protected] --save
# Angular 4
npm install [email protected] --save

Demo App

Working online demo of Angular QR Code Generator

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

npm start

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

Usage and Example Implementations

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.

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>

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.

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.
• You cannot contribute but want to support development? Consider a sponsorship.

Sponsoring

Support the development of angularx-qrcode (or even see your logo here?), consider sponsoring angularx-qrcode. Your support is much appreciated!

License

MIT License

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