Trying to figure out express-sessions

package.json

{
  "name": "requesttest",
  "version": "1.0.0",
  "description": "Testing out requests",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev:server": "nodemon --ignore sessions/ server.js"
  },
  "author": "fuzzylimes",
  "license": "MIT",
  "dependencies": {
    "body-parser": "^1.18.3",
    "express": "^4.16.3",
    "express-session": "^1.15.6",
    "request": "^2.86.0",
    "session-file-store": "^1.2.0",
    "uuid": "^3.2.1"
  }
}

sessions.js

const express = require('express');
const uuid = require('uuid/v4');
const session = require('express-session');
const FileStore = require('session-file-store')(session);
const bodyParser = require('body-parser');

const app = express();

app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());
app.use(session({
    genid: (req) => {
        console.log('Inside the session Midleware');
        console.log(req.sessionID);
        return uuid()
    },
    key: 'user_sid',
    store: new FileStore(),
    secret: 'krusty krab',
    resave: true,
    unset: 'destroy',
    saveUninitialized: true,
    cookie: {
        maxAge: 60 * 1000
    }
}));

// app.use((req, res, next) => {
//     console.log(req.session.cookie.expires);
//     console.log(new Date().toISOString());
//     console.log()
//     if(req.session.cookie.expires < new Date().toISOString()){
//         console.log("I'm here");
//         res.clearCookie('user_sid');
//         req.session.destroy((err) => {
//             console.log(err);
//         });
//     }
//     next();

// });

app.get('/', (req, res) => {
    console.log('Inside the homepage callback function');
    console.log(req.sessionID)
    console.log(req.session.state);
    res.send(`Hit the home page.\n`);
})

app.get('/login', (req, res) => {
    console.log('Inside GET /login callback function');
    console.log(req.sessionID);
    res.send('You got the login page\n');
});

app.post('/login', (req, res) => {
    console.log('Inside POST /login callback function');
    console.log(req.body);
    req.session.state = true;
    console.log(req.session.state);
    res.send('You posted to the login page\n');
})

app.get('/restricted', (req, res) => {
    if(req.session.state){
        res.send('You reach the restricted page\n');
    } else {
        res.redirect('/login');
    }
})

app.listen(5555, () => {
    console.log('Listening on port 5555');
});