last filename is missing from req.files while use of 'fileds' middleware.

[greyHairChooseLife]

I was trying to

response which files are uploaded right after client uploaded multiple files.

Codes

API route to load my lovely multer middleware,

app.post("/uploadFiles", uploads, (req, res) => {
  try {
    const uploadedQueryFiles = req.files?.queryFiles?.map(
      console.log(file);
      (file) => file.filename
    );
    const uploadedTargetFiles = req.files?.targetFiles?.map((file) => {
      console.log(file);
      return file.filename;
    });
    res.status(200).json({
      message: "result of upload:",
      uploadedQueryFiles,
      uploadedTargetFiles,
    });
  } catch (err) {
    console.log(err);
    res.status(500).json({ message: "server error while uploading." });
  }
});

This gives me logs(from console.log in code above) like below, but the last one doesn't have filename or anything but fieldname.

{
  fieldname: 'targetFiles',
  originalname: 'originam file name.docx',
  encoding: '7bit',
  mimetype: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
  destination: 'INPUT/target',
  filename: 'new file name.docx',
  path: 'INPUT/target/new file name.docx',
  size: 15882
}
{ fieldname: 'targetFiles' }

how I configured middleware

// QUERY 저장소
const queryStorage = multer.diskStorage({
  destination: (_req, _file, cb) => {
    // req.params등을 통해서 동적으로 폴더, 파일명을 생성할 수도 있다.
    // https://stackoverflow.com/questions/59646445/multer-create-folder-if-not-exist
    const path = "INPUT/query";
    fs.mkdirSync(path, { recursive: true });
    return cb(null, path);
  },
  filename: (_req, file, cb) => {
    cb(null, Buffer.from(file.originalname, "latin1").toString("utf8"));
  },
});

// TARGET(DATA) 저장소
const targetStorage = multer.diskStorage({
  destination: (_req, _file, cb) => {
    const path = "INPUT/target";
    fs.mkdirSync(path, { recursive: true });
    return cb(null, path);
  },
  filename: (_req, file, cb) => {
    cb(null, Buffer.from(file.originalname, "latin1").toString("utf8"));
  },
});

const queryDest = multer({
  storage: queryStorage,
  fileFilter: (_req, file, cb) =>
    file.fieldname === "queryFiles" ? cb(null, true) : cb(null, false),
});
const targetDest = multer({
  storage: targetStorage,
  fileFilter: (_req, file, cb) =>
    file.fieldname === "targetFiles" ? cb(null, true) : cb(null, false),
});

const uploads = (req, res, next) => {
  queryDest.fields([{ name: "queryFiles" }, { name: "targetFiles" }])(
    req,
    res,
    next
  );
  targetDest.fields([{ name: "queryFiles" }, { name: "targetFiles" }])(
    req,
    res,
    next
  );
};

There is a man facing same one

in stackoverflow

Unfortunately, he got no proper answer yet.