How do I set up a backend for JWT authentication?

How do I set up a backend for JWT authentication?

To set up a backend for JWT authentication, you'll need to choose a framework like Express.js and install necessary packages.

What packages do I need to install?

You should install 'jsonwebtoken' for creating tokens and 'express' for building your server.

Can you show me a basic code example?

Sure! Here's a simple example:

const express = require('express');
const jwt = require('jsonwebtoken');

const app = express();
app.use(express.json());

app.post('/login', (req, res) => {
    // Authenticate user
    const token = jwt.sign({ userId: 1 }, 'your_secret_key');
    res.json({ token });
});

app.listen(3000, () => console.log('Server running on port 3000'));