var readFiles = function(onSuccess){
  var fileList=[];
  fs.readdir("./public/txt", function(err, files){

    files.forEach(function (file){
      fileList.push(file);
      fs.stat("./public/txt/"+file, function(err, status){
        console.log(status.mtime);
        fileList.push(status.mtime);

    if( loop.isLast ){
           onSuccess(fileList);
        }

      });
    });
  });
}

router.get("/fileList", function(req, res){
   readFiles(function(result){
      res.send(result);
   });
});