how to create year/month/day structure when uploading files with nodejs multer?

Question

I want to upload the file using multer into folder structure with year/month/day. Like upload/2021/06/27/filename. How can I do that?

//configuring multer storage for images
const fileStorage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, 'upload/');
    },
    filename: (req, file, cb) => {
        cb(null, new Date().toISOString().replace(/:/g, '-') + '-' + file.originalname);
    }
});

Answer 1

You can create a custom function using fs library functions,

• initialize fs lib

const fs = require("fs");

• create a method to return date path on the base of input param current date
• ex:
  • input: new Date()
  • return: "2021/6/27"

function getDatePath(date) {
    return date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + date.getDate();
}

• create directory recursive if it does not exist, can handle with try-catch block

function getDirPath(dirPath) {
    try {
        if (!fs.existsSync(dirPath)) fs.promises.mkdir(dirPath, { recursive: true });
        return dirPath;
    } catch (error) {
        console.log(error.message);
    }
}

• use the above method in destination

//configuring multer storage for images
const fileStorage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, getDirPath('upload/' + getDatePath(new Date())));
    },
    filename: (req, file, cb) => {
        cb(null, new Date().toISOString().replace(/:/g, '-') + '-' + file.originalname);
    }
});