npm add  qrcode-parser

import qrcodeParser from 'qrcode-parser'

let img = '';
qrcodeParser().then(res =>{
    console.log(res)
})

npm add ngx-qrcode2

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { NgxQRCodeModule } from 'ngx-qrcode2';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    NgxQRCodeModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

<div style="text-align:center">
  <h1>ngx-qrcode2 demo</h1>
</div>

<ngx-qrcode
      [qrc-element-type]="elementType"
      [qrc-value] = "value"
      qrc-class = "aclass"
      qrc-errorCorrectionLevel = "L">
</ngx-qrcode>

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'app';
  elementType = 'url';
  value = 'Techiediaries';
}

npm install @techiediaries/ngx-qrcode --save

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { QrCodeAllModule } from 'ngx-qrcode-all';
import { AppComponent } from './app.component';

@NgModule({
    imports: [
        CommonModule,
        QrCodeAllModule
    ],
    declarations: [
        AppComponent
    ]
})
export class AppModule {
    constructor() {}
}

<div id="qrcodeid">
 <qr-code-all [qrCodeType]="url"
     [qrCodeValue]="'SK is the best in the world!'"
     [qrCodeVersion]="'1'"
     [qrCodeECLevel]="'M'"
     [qrCodeColorLight]="'#ffffff'"
     [qrCodeColorDark]="'#000000'"
     [width]="11"
     [margin]="4"
     [scale]="4"
     [scanQrCode]="false">
 </qr-code-all>
</div>

<div id="qrcodeid">
 <qr-code-all [canvasWidth]="640"
     [canvasHeight]="480"
     [debug]="false"
     [stopAfterScan]="true"
     [updateTime]="500"
     (onCapture)="captureImage($event)"
     [scanQrCode]="true">
 </qr-code-all>
</div>