[riaron86]

теперь нет ошибок но значение data undfined

App.js

import React from "react";
import Shop from "./pages/Shop";

// client/src/App.js
function App({arrayse}) {
    const [data, setData] = React.useState(null);

    React.useEffect(() => {
      const res=  fetch('http://localhost:3001/api',{mode: 'no-cors'});

        setData(res.json);
    }, []);
    console.log(data);

    return (
        <div className="App">
            <header className="App-header">
                <p>{!data ? "Loading..." : data}</p>
            </header>
        <Shop arrayse={arrayse}/>
        </div>
    )
}

export default App;

index.php

const express = require("express");
const PORT =  3001;

const app = express();

app.get("/api", (req, res) => {
    res.set('Access-Control-Allow-Origin', 'https://localhost:3001',{mode: 'no-cors'});

    res.json({ message: "Hello from server!" });
});


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