I have created an app that has a cart that sends data to the backend, now when I restore I want to preserve the data and display the same data as before.

I have used the PUT method instead of POST and when I send and get data from Firebase, data is preserved on reload and the data from the database is visible, but if I use my own backend in Node.js, I am not able to get the data on reload. This is where I am fetching data from the backend.

export const fetchCartData=()=>{
 return async(dispatch)=>{
  const getData= async() =>{
   const response = await fetch('https://localhost:5000/');
   if(!response.ok){
    throw new Error('Something went wrong'); 
   }
   const info=await response.json();
   return info;
};

  try{
   const data= await getData();
   console.log("Here is data from Firebase", data);
   dispatch(order_action.replaceCart({
     items:data.items || [],
     totalQuantity:data.totalQuantity || 0
   }));
  }catch(error){
   dispatch(show_action.showNotification({
     status:"failed",
     title:"Error...",
     message:"Some error occurred."
   }));
  }
 }
}

Tha backend Code is:

const express=require("express");
const bodyParser=require('body-parser');
const cors=require('cors');
const app=express();
app.use(cors());
app.use(bodyParser.json());

app.put("/",function (req,res) {
  const data={
    items:req.body.items,
    totalQuantity:req.body.totalQuantity
  }
console.log(data);
console.log("END");
res.send({data});
})

app.get("/",function (req,res) {
console.log(req.body);
const data={
  items:req.body.items,
  totalQuantity:req.body.totalQuantity
}

res.send({data})
})

app.listen(5000,function () {
console.log("Running on 5000");
})