npm install xlsx
                  npm install file-saver
                

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

                  import { AppComponent } from './app.component';
                  import {FormsModule} from '@angular/forms';
                  import { ExcelService } from './services/excel.service';

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


                

ExcelService

                import { Injectable } from '@angular/core';
                import * as FileSaver from 'file-saver';
                import * as XLSX from 'xlsx';

                const EXCEL_TYPE = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8';
                const EXCEL_EXTENSION = '.xlsx';

                @Injectable()
                export class ExcelService {

                  constructor() { }

                  public exportAsExcelFile(json: any[], excelFileName: string): void {
                    
                    const myworksheet: XLSX.WorkSheet = XLSX.utils.json_to_sheet(json);
                    const myworkbook: XLSX.WorkBook = { Sheets: { 'data': myworksheet }, SheetNames: ['data'] };
                    const excelBuffer: any = XLSX.write(myworkbook, { bookType: 'xlsx', type: 'array' });
                    this.saveAsExcelFile(excelBuffer, excelFileName);
                  }

                  private saveAsExcelFile(buffer: any, fileName: string): void {
                    const data: Blob = new Blob([buffer], {
                      type: EXCEL_TYPE
                    });
                    FileSaver.saveAs(data, fileName + '_exported'+ EXCEL_EXTENSION);
                  }

                }

                

                  import { Component } from '@angular/core';
import { ExcelService } from './services/excel.service';


export class AppComponent {
  title = 'exportExcelInAngular';
  dataOfFootballers: any = [{
    playerName: 'Cristiano Ronaldo',
    playerCountry: 'Pourtgal',
    playerClub: 'Juventus'
  },
  {
    playerName: 'Lionel Messi',
    playerCountry: 'Argentina',
    playerClub: 'Barcelona'
  },
  {
    playerName: 'Neymar Junior',
    playerCountry: 'Brazil',
    playerClub: 'PSG'
  },
  {
  playerName: 'Tonni Kroos',
  playerCountry: 'Germany',
  playerClub: 'Real Madrid'
  },
  {
    playerName: 'Paul Pogba',
    playerCountry: 'France',
    playerClub: 'Manchester United'
  }];
  constructor(private excelService:ExcelService){

  }
  exportAsXLSX():void {
    this.excelService.exportAsExcelFile(this.dataOfFootballers, 'footballer_data');
  }
}


                

                  <button (click)="exportAsXLSX()">
  <i class="fa fa-file-excel-o" style="font-size:48px;color:blue"></i></button>
  
<table class="table table-striped">
	<tr>
		<td><b>Player Name</b></td>
		<td><b>Player Country</b></td>
		<td><b>Player Club</b></td>
  </tr>
  <tbody>
	<tr *ngFor="let item of dataOfFootballers">
		<td>{item.playerName}</td>
		<td>{item.playerCountry}</td>
		<td>{item.playerClub}</td>
  </tr>
  </tbody>
</table>