session.js

const express = require('express');
const session = require('express-session');
const app = express();
const port = 3000;

app.use(session({
    secret: '!@#$%^&*()',
    resave: false,
    saveUninitialized: true,
}));

app.listen(port, () => console.log(`Server listening on port ${port}!`));

app.get('/set/:id', (req, res) => {
    const { id } = req.params;
    req.session.requester = {
        id: parseInt(id, 10),
        name: `user#${id}`,
        level: Math.floor(Math.random() * 10) + 1,
    };
    return res.send(`Completed /set/${id}`);
});

app.get('/get', (req, res) => {
    const {requester} = req.session;
    if(!requester) return res.sendStatus(401);
    const {id, name, level} = requester;
    return res.send(`id: ${id} / name: ${name} / level: ${level}`);
});

app.get('/destroy', (req, res) => {
    req.session.destroy(err => {
        if (err) return res.sendStatus(500);
        else return res.send('Destroy Completed');
    })
})