How to generate QR Codes with Angular 10 ?

QR Code (Quick Response Code) has become the essential component for each and every product, organization, app, etc. In marketing campaigns, we can use the generated QR code to

• Download apps
• Send Email
• View business location etc.

In this article let us see how to generate QR Codes with Angular 10.

Prerequisites: In your local development machine Node 10+, together with NPM 6+ must have been installed.

• Node can be installed from https://nodejs.org/en/download/
• Once installed we can verify the same by using

node --version

• npm can be installed from https://www.npmjs.com/get-npm
• Once installed we can verify the same by using

npm  --version

Step 1: Installing Angular CLI 10

From the command line prompt, provide the following command to install

 npm install -g @angular/cli

As per the current version, it will be installed, and best that the version should be 10+

Step 2: Let us create a new Angular app

We can use Visual Studio Code editor or even from the command line prompt, we can create a sample project that generates QR code

ng new <projectname>

Here let us have “angular10qrcodegeneration” as the projectname

Necessary packages will be installed 

Now the project structure of “angular10qrcodegeneration” will be

Navigate to the project directory where package.json is present

Important file specifying the dependencies of the project

Step 3: To generate QRCode, we need the required dependency. It can be installed by using

 npm install @techiediaries/ngx-qrcode

Once this is installed, in src->app->qrcodeapp.module.ts file, we can use

import { NgxQRCodeModule } from '@techiediaries/ngx-qrcode'; 

And in

@NgModule({
imports: [ NgxQRCodeModule ] Can be given

We need to additionally import FormsModule. So, our  src->app->app.module.ts snippet 

qrcodeapp.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';

// This import is required to have QRCode generation
import { NgxQRCodeModule } from '@techiediaries/ngx-qrcode';
import { QRCodeAppRoutingModule } from './qrcodeapp-routing.module';
import { QRCodeAppComponent } from './qrcodeapp.component';

@NgModule({
  declarations: [
    QRCodeAppComponent
  ],
  imports: [
    BrowserModule,
    QRCodeAppRoutingModule,
    NgxQRCodeModule,  // This import is required for QRCode
    FormsModule
  ],
  providers: [],
  bootstrap: [QRCodeAppComponent]
})
export class QRCodeAppModule { }

Now the library has been imported, and we can use the “ngx-qrcode” component in Angular application.

qrcodeapp.component.ts

import { Component } from '@angular/core';
import { NgxQrcodeElementTypes, NgxQrcodeErrorCorrectionLevels }
        from '@techiediaries/ngx-qrcode';
@Component({
  selector: 'app-root',
  templateUrl: './qrcodeapp.component.html',
  styleUrls: ['./qrcodeapp.component.css']
})

export class AppComponent {
  title = 'angular10qrcodegeneration';

  // We can have Canvas/Img/Url as elementType
  elementType = NgxQrcodeElementTypes.URL;

  // We can have High/Low/Medium/Quartile
  correctionLevel = NgxQrcodeErrorCorrectionLevels.HIGH;

  // Need to specify the valid website address
  value = 'https://www.geeksforgeeks.com/';
}

qrcodeapp.component.html

<ngx-qrcode
  [elementType]="elementType"
  [errorCorrectionLevel]="correctionLevel"
  [value]="value"
  cssClass="qrcodeshadow"></ngx-qrcode>
<!-- value that you want to encode -->
<textarea [(ngModel)] = "value"></textarea>

style.css

/* You can add global styles to this file,
and also import other style files */
.qrcodeshadow {
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(15px 15px 15px #e42424);
    opacity: .5;
}

textarea {
    margin-top: 15px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 400px;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: large;
    font-weight: bold;
    color: green;
    opacity: .5;
}

Steps to build the project

ng build (at the location where your package.json present)

Steps to run the project:

ng serve  (at the location where your package.json present)

As the code is set run on port 4200, on hitting http://localhost:4200/, we can able to see the output as

We can specify any valid website URL, and we can generate QR codes successfully in Angular 10. In CSS, we can beautify the shadow display.

Let us see the output for the google website

Conclusion: Many important libraries like QRCode generators are available in npm Angular. We can effectively use them according to our needs. QRCode is an essential component for any application/mobile app etc.