app.js

const express = require('express')
const fileUpload = require('express-fileupload')
const path = require('path')

const app = express()

app.set('view engine', 'ejs')

app.use(
  fileUpload({
    useTempFiles: true,
    tempFileDir: path.join(__dirname, 'tmp'),
    createParentPath: true,
    limits: { fileSize: 2 * 1024 * 1024 },
  })
)

app.get('/', async (req, res, next) => {
  res.render('index')
})

app.post('/single', async (req, res, next) => {
  try {
    const file = req.files.mFile
    console.log(file)
    const fileName = new Date().getTime().toString() + path.extname(file.name)
    const savePath = path.join(__dirname, 'public', 'uploads', fileName)
    if (file.truncated) {
      throw new Error('File size is too big...')
    }
    if (file.mimetype !== 'image/jpeg') {
      throw new Error('Only jpegs are supported')
    }
    await file.mv(savePath)
    res.redirect('/')
  } catch (error) {
    console.log(error)
    res.send('Error uploading file')
  }
})

app.post('/multiple', async (req, res, next) => {
  try {
    const files = req.files.mFiles

    // files.forEach(file => {
    //   const savePath = path.join(__dirname, 'public', 'uploads', file.name)
    //   await file.mv(savePath)
    // })

    // let promises = []
    // files.forEach((file) => {
    //   const savePath = path.join(__dirname, 'public', 'uploads', file.name)
    //   promises.push(file.mv(savePath))
    // })

    const promises = files.map((file) => {
      const savePath = path.join(__dirname, 'public', 'uploads', file.name)
      return file.mv(savePath)
    })

    await Promise.all(promises)

    res.redirect('/')
  } catch (error) {
    console.log(error)
    res.send('Error uploading files...')
  }
})

app.listen(3000, () => console.log('🚀 server on port 3000'))