How do you connect React frontend with Express backend?

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To connect a React frontend with an Express backend, you make HTTP requests from React to the backend’s API endpoints.

Steps:

1. Set up Express Backend

jt
// server.js
const express = require('express');
const app = express();
app.use(express.json());

app.get('/api/message', (req, res) => {
  res.json({ text: 'Hello from backend!' });
});

app.listen(5000, () => console.log('Server running on port 5000'));

2. Run Backend and Frontend

• Backend: node server.js (port 5000)

• Frontend: npm start (default port 3000)

3. Handle CORS (if different ports)

const cors = require('cors');
app.use(cors());

4. Make API Calls in React

// App.js
import { useEffect, useState } from 'react';
function App() {
  const [msg, setMsg] = useState('');
  useEffect(() => {
    fetch('http://localhost:5000/api/message')
      .then(res => res.json())
      .then(data => setMsg(data.text));
  }, []);
  return <h1>{msg}</h1>;
}
export default App;

5. Optional: Proxy Setup

• In React’s package.json:

"proxy": "http://localhost:5000"

Then call /api/message directly without the full URL.

This lets React send requests to Express and receive data seamlessly.

Read More :

How do you define a model in Mongoose?

How does the MERN stack work end to end?

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