app.js

const express = require("express");
const bp = require("body-parser");
const port = 5000;
const app = express();

const multer = require("multer");

app.use(bp.urlencoded({ extended: false }));
app.use(bp.json());

app.use(require("morgan")("dev"));

var storage = multer.diskStorage({
  destination: function(req, file, cb) {
    cb(null, "./"); // here we specify the destination . in this case i specified the current directory
  },
  filename: function(req, file, cb) {
    console.log(file);
    cb(null, file.originalname);// here we specify the file saving name . in this case i specified the original file name
  }
});

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

app.post("/fileuploaddisk", uploadDisk.single("image"), (req, res) => {
  console.log(" file disk uploaded");
  res.send("file disk upload success");
});

app.listen(port, () => {
  console.log("Express server listning on port " + port);
});