I need to get the req. body from the server before it uploading the file to multer.

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
   console.log(req.body) // null
   const folderName = req.body.folderName // null
    cb(null, `/tmp/my-uploads/${folderName}`)
  },
  filename: function (req, file, cb) {
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9)
    cb(null, file.fieldname + '-' + uniqueSuffix)
  }
})

const upload = multer({ storage: storage })

How to get req.body