How to upload file using multer or body-parser

Question

I am a NodeJS beginner, following along a book \"Web Development with MongoDB and NodeJS\". I am stuck at its chapter 6 with \'multer\'. When I use multer for file uploads t

Answer 1

Code for upload file using Multer and save it to local folder

api- call fileUpload function
fileUpload(req)
    .then(uploadRes => {
        console.log('uploadRes', uploadRes)
    })
    .catch(err => {
        console.log('err', err)
    })


Create file upload service
const multer = require('multer') // import library
const moment = require('moment')
const q = require('q')
const _ = require('underscore')
const fs = require('fs')
let dir = './public'

/** Store file on local folder */
let storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, dir)
    },
    filename: function (req, file, cb) {
        let date = moment(moment.now()).format('YYYYMMDDHHMMSS')
        cb(null, date + '_' + file.originalname.replace(/-/g, '_').replace(/ /g, '_'))
    }
})

/** Upload files */
let upload = multer({ storage: storage }).array('files')

/** Exports fileUpload function */
module.exports = {
    fileUpload: function (req) {
        let deferred = q.defer()

        /** Create dir if not exist */
        if (!fs.existsSync(dir)) {
            fs.mkdirSync(dir)
            console.log(`\n\n ${dir} dose not exist, hence created \n\n`)
        }

        upload(req, {}, function (err) {
            if (req && (_.isEmpty(req.files))) {
                deferred.resolve({ status: 200, message: 'File not attached', data: [] })
            } else {
                if (err) {
                    deferred.reject({ status: 400, message: 'error', data: err })
                } else {
                    deferred.resolve({
                        status: 200,
                        message: 'File attached',
                        filename: _.pluck(req.files,
                            'filename'),
                        data: req.files
                    })
                }
            }
        })
        return deferred.promise
    }
}