如何在通过multer上传文件之前自动创建文件夹，以便这些文件存储在nodejs中创建的文件夹中？

Question

This is my multer code to upload multiple files.

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, './public/files/'+ req.user.id)
  },
  filename: function (req, file, cb) {
    x = file.originalname; //+path.extname(file.originalname);
  cb(null,x);
  }
});

var upload = multer({storage: storage});

This is the post request where files get submitted on click submit.

router.post(upload.array("FileUpload",12), function(req, res, next) {

//Here accessing the body datas.

})

So what I want is that, I want to create a folder first with the name of the ID generated which can be access from the req.body and then upload those files into that folder respectively. But since I cannot access the body first before upload I am unable to create that respective folder directory. Is there any other way around which I can think of and implement this?

Updated Solution using fs-extra package.

const multer = require('multer');
let fs = require('fs-extra');

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    let Id = req.body.id;
    fs.mkdirsSync('./public/files/'+ req.user.id + '/' + Id);
    cb(null, './public/files/'+ req.user.id + '/' + Id)
  },
  filename: function (req, file, cb) {
    x = file.originalname; //+path.extname(file.originalname);
  cb(null,x);
  }
});

var upload = multer({storage: storage});

This is the post request where files get submitted on click submit.

router.post(upload.array("FileUpload",12), function(req, res, next) {

//Here accessing the body datas.

})

Answer 1

you have to install first the fs-extra which will create folder

create seprate folder for multer like multerHelper.js

const multer = require('multer');
let fs = require('fs-extra');

let storage = multer.diskStorage({
destination: function (req, file, cb) {
    let Id = req.body.id;
    let path = `tmp/daily_gasoline_report/${Id}`;
    fs.mkdirsSync(path);
    cb(null, path);
},
filename: function (req, file, cb) {
    // console.log(file);

    let extArray = file.mimetype.split("/");
    let extension = extArray[extArray.length - 1];
    cb(null, file.fieldname + '-' + Date.now() + "." + extension);
 }
})

let upload = multer({ storage: storage });

let createUserImage = upload.array('images', 100);

let multerHelper = {
    createUserImage,
}

module.exports = multerHelper;

in your routes import multerhelper file

const multerHelper = require("../helpers/multer_helper");

router.post(multerHelper , function(req, res, next) {

//Here accessing the body datas.

})

Answer 2

I followed your code, but it returns undefined in the folder name. How did you get correct id? Thanks