[Javascript] เจอปัญหาในการฝึกเขียน express.js ครับ

const express = require('express');
const indexRouter = require('./routes/classes.js');
const userRouter = require('./routes/users.js')
const cors = require('cors');
const session = require('express-session');
const passport = require('passport');
const localStrategy = require('passport-local').Strategy;

const app = express();

app.get('*',(req,res,next) => {
    res.locals.user = req.user || null;
    next();
})

// middle ware
app.use(express.urlencoded({extended:true}));
app.use(cors({ origin: 'http://localhost:3000' }));
app.use(session({
    secret:'elerning',
    resave:false,
    saveUninitialized:true,
    cookie:{
        secure:false,
        // httpOnly:true,
        // sameSite:'lax'
    }
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(express.json());
app.use(indexRouter);
app.use(userRouter);

app.listen(5000,() => {console.log('server start at port 5000')})

const express = require('express');
const indexRouter = require('./routes/classes.js');
const userRouter = require('./routes/users.js')
const cors = require('cors');
const session = require('express-session');
const passport = require('passport');
const localStrategy = require('passport-local').Strategy;

const app = express();

app.get('*',(req,res,next) => {
    res.locals.user = req.user || null;
    next();
})

// middle ware
app.use(express.urlencoded({extended:true}));
app.use(cors({ origin: 'http://localhost:3000' }));
app.use(session({
    secret:'elerning',
    resave:false,
    saveUninitialized:true,
    cookie:{
        secure:false,
        // httpOnly:true,
        // sameSite:'lax'
    }
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(express.json());
app.use(indexRouter);
app.use(userRouter);

app.listen(5000,() => {console.log('server start at port 5000')})

fetch(url, {
  credentials: 'include',
  headers: {
    'Content-Type': 'application/json'
  }
})

fetch(url, {
  credentials: 'include',
  headers: {
    'Content-Type': 'application/json'
  }
})