save excel file using FileSaver.js

Try the following code that will help you to create an excel file for you.

var result = ["Item 1", "Item 3"];
const myJsonString = JSON.stringify(result);
const blob = new Blob([myJsonString], {
  type: "application/vnd.ms-excel;charset=utf-8"
});
saveAs(blob, "Report.xls");

Demo