如何自动覆盖json结果中的现有文件？ laravel

I want to automatically store existing file json without change file name. Anyone can help me?

This is my code

class jsonDownload extends Controller
{
    public function downloadJSONFile(){
        $data = json_encode(DB::table('tabel')->get()->toArray());
        $fileName = '1562261772_datafile.json';
        File::put(public_path('upload/json/'.$fileName),$data);
        return Response::download(public_path('upload/json/'.$fileName));
    }
}

when I download, it always store as 1562261772_datafile (1).json I don't want download as number but i want overwrite it.