Angular 8 Typescript Build CSV from JSON

csvService.service.ts

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

@Injectable({
  providedIn: 'root'
})

export class CsvService {
  /* 
    object in array = line
    
    Execute: 
    - 1.) buildCsv with any array filled with content objects
    - 2.) execute downloadCsv method to download the csv from the browser
  */
  public buildCsv(items: Array<any>): string {
    let csvContent = 'data:text/csv;charset=utf-8,';

    let headerRow = '';
    for (let [key, value] of Object.entries(items[0])) {
      headerRow += key + ';';
    }

    if (headerRow.length > 1) {
      headerRow = headerRow.substr(0, headerRow.length - 1);
    }

    csvContent = csvContent + headerRow + '\n';

    for (let item of items) {
      let row = '';
      for (let [key, value] of Object.entries(item)) {
        row += value + ';';
      }

      if (row.length > 1) {
        row = row.substr(0, row.length - 1);
      }
      csvContent = csvContent + row + '\n';
    }

    return csvContent;
  }

  public downloadCsv(csvContent: string) {
    let encodeUri = encodeURI(csvContent);

    let link = document.createElement('a');
    link.setAttribute('href', encodeUri);
    link.setAttribute('download', 'csvData.csv');
    document.body.appendChild(link);

    link.click();
  }
}