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src/app/_services/tableexcel.service.ts

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+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({
+  providedIn: 'root'
+})
+export class TableexcelService {
+  constructor() { }
+  public exportAsExcelFile(json: any[], excelFileName: string): void {
+    const worksheet: XLSX.WorkSheet = XLSX.utils.json_to_sheet(json);
+    console.log('worksheet', worksheet);
+    const workbook: XLSX.WorkBook = {
+      Sheets: { data: worksheet },
+      SheetNames: ['data']
+    };
+    const excelBuffer: any = XLSX.write(workbook, {
+      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 + '_export_' + new Date().getTime() + EXCEL_EXTENSION
+    );
+  }
+}