Express session is not keeping its data - node.js

Question

I have a mern web app, and I'm using express session. The problem is, the cookie data is not getting saved when I try retrieving it on a different route. It gets set and outputs correctly on the same route, but when I go to another route, and try to retrieve the session data, it returns undefined.
What's weird, is that the session does get stored in mongodb, but I can't retrieve it.
What am I doing wrong and how can I fix it?
Here's the relevant code:
Session.js
const session = require('express-session');
const MongoStore = require('connect-mongo')(session);
const mongoose = require('mongoose');
module.exports = function(app) {
var sess = {
secret: 'mySecret',
cookie: { token: null },
saveUninitialized: false,
resave: true,
store: new MongoStore({ mongooseConnection: mongoose.connection })
};
if (app.get('env') === 'production') {
app.set('trust proxy', 1);
sess.cookie.secure = true;
}
app.use(session(sess));
};
Route.js
module.exports = function(app) {
app.use(cors());
app.use(helmet());
require('../middleware/session')(app);
// Other routes...
};
File1
router.post('/', async (req, res) => {
req.session.token = 'hello';
console.log(req.session.token); // Outputs 'hello'
res.send(req.session.token);
});
File2 This gets called After the page reloads
router.get('/me', async (req, res) => {
console.log(req.session.token); // Outputs undefined
console.log(req.session);
// Outputs: "Session {
// cookie: { path: '/',
// _expires:null,
// originalMaxAge: null,
// httpOnly: true }
// }
res.send(req.session.token);
});

Answer 1

You should add the code below in your app.js file
var cookieParser = require('cookie-parser');
var session = require('express-session');
app.use(cookieParser());
app.use(session({secret: "Funny secret"}));
That's the simple way to do it. Then you may be able to assign and access values to the req.session object.