How to download file in base64 format using ajax request

download_base64_ajax.js

$.ajax({
    url: "https://api.yoursite.com",
    type: 'GET',
    data: data,
}).done(function(res){
        var a = document.createElement('a');
        a.href = 'data:application/pdf;base64,' +  res;
        a.download = 'documents.pdf';
        document.body.append(a);
        a.click();
        a.remove();
        toastr["success"]("Archivo multiple generado exitosamente","Exito");
});