multipart file upload not working using multer's diskStorage

nodejs

I am using multer to upload file in nodejs. The below code seems to work fine.

const upload = multer({ dest: "uploads/" });

But the code below doesn't work.

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, "./uploads/");
  },
  filename: function (req, file, cb) {
    cb(null, new Date().toISOString() + file.originalname);
  },
});

Any idea on how to solve it?