Code Explanation Video Link : 
https://youtu.be/zwuUdpF4Egk

Code :

const express = require("express");
const app = express();
app.use(sayMyName);
app.get("/", isLoggin, (req, res) => {
  console.log("After middleware");
  console.log(req.user);
  res.send("Welcome to JoBat Virtuschool");
});

function sayMyName(req, res, next) {
  console.log("In MiddleWare");
  next();
}

function isLoggin(req, res, next) {
  if (req.query.isLogin === "true") {
    console.log("Login user");
    req.user = "Jobat user";
    next();
  } else {
    res.send("Access Denied");
  }
}

app.listen(5000, () => {
  console.log("Server Running");
});