It is possible make some kind of function for each uploaded file when posting multiple files at once?

[code-by]

I have following for upload files into S3

const upload = extension => multer({
  storage: multerS3({
    s3,
    bucket,
    acl,
    metadata(req, file, cb) {
      cb(null, { fieldName: file.fieldname });
    },
    ...
  }),
});

router.post(
  '/upload',
  upload('jpg').array('files', 5),
  (req, res) => {
    console.log(req.files);
    ...

It is possible to make some kind of function for each single uploading file (to write some information about file into DB before multer begin uploading next file from array('files', 5) ) (for example, if writing data into DB failed multer need to abort uploading rest of files) or for this I need upload each file separately?

[cpheimbach]

I am having the same use case. Did you find a solution? Currently I do this via the req object in the route which handles the file.

[Ovi]

+1

[LinusU]

You could use the metadata function that you have in your example.

Happy to consider a specific function if someone makes a clear API proposal.

Closing since this is quite old...