React - Node.js uygulamasında locals ile session verisi taşıma

import axios from 'axios'
import { useState } from 'react'

function App() {

  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const data = {
    email: email,
    password: password
  }
  const requestHandler = async (e) => {
    e.preventDefault()
    if (data.email && data.password) {
      const response = await axios.post("http://localhost:5000/login", data)
      console.log(response.data)
      const auth = await axios.get("http://localhost:5000/")
      console.log(auth)
    }
  }

  return (
    <div className="App">
      <form action="">
        <label htmlFor="">email</label>
        <input type="text" onChange={(e) => { setEmail(e.target.value) }} />
        <label htmlFor="">password</label>
        <input type="password" onChange={(e) => { setPassword(e.target.value) }} />
        <button type='submit' onClick={requestHandler}>REQUEST</button>
      </form>
    </div>
  );
}

export default App;

const express = require("express")
const app = express()
const cors = require("cors")
const bodyParser = require("body-parser")
const session = require("express-session")

app.use(session({
    secret: "secret key",
    resave: false,
    saveUninitialized: false
}))


app.use(cors())
app.use(bodyParser.json())

app.use(function (req, res, next) {
    res.locals.auth = req.session.auth
    next()
})

app.get("/", (req, res) => {
    res.send({ session: res.locals.auth })
    console.log("locals", res.locals)
})


app.post("/login", (req, res) => {
    const { email, password } = req.body
    if (email && password) {
        req.session.auth = true
    }
    console.log(email)
    console.log(password)
})

app.listen(5000, () => {
    console.log("Sunucu 5000 portunda çalışıyor.")
})

app.use(function (req, res, next) {
 res.locals.auth = req.session.auth
 next()
})