expressjs multer file upload

index.html

  <form action="/photos/upload" enctype="multipart/form-data" method="post">
      <input type="file" name="photos" multiple>
      <input type="text" name="desc">
      <input type="submit" value="Submit">            
  </form>

index.js

const path = require("path");
const express = require("express");
const multer = require("multer");

const upload = multer({
  // file size limitation in bytes
  limits: {
    fileSize: 1 * 1024 * 1024,
  },
  // file validation
  fileFilter: (req, file, cb) => {
    const ext = path.extname(file.originalname);
    if (ext !== ".jpg") {
      cb(new Error("image must be jpg"));
    }
    cb(null, true);
  },
  // file storage configuration
  storage: multer.diskStorage({
    destination: (req, file, cb) => {
      cb(null, path.join(__dirname, "/uploads"));
    },
    filename: (req, file, cb) => {
      let filename =
        file.fieldname + "-" + Date.now() + path.extname(file.originalname);
      cb(null, filename);
    },
  }),
});

const uploadTwo = upload.array("photos", 2);

const app = express();

app.post("/photos/upload", function (req, res, next) {
  uploadTwo(req, res, (err) => {
    // file size multer error
    if (err instanceof multer.MulterError) {
      return res.end("multer: " + err);
    }
    // custom error from fileFilter
    else if (err) {
      return res.end("err: " + err);
    }

    // upload.single
    // console.log(req.file);

    // upload.fields
    // console.log(req.files['first'][0])

    // upload.files
    console.log(req.files);

    // other form data
    console.log(req.body);

    return res.end("ok");
  });
});

app.get("/", function (req, res) {
  res.sendFile(path.join(__dirname, "/index.html"));
});

app.listen(8000);