// Import 'jsonwebtoken' module
const jwt = require('jsonwebtoken');

// Secret key for signing and verifying JWT tokens
const secret = 'mysecretkey';

// Create a JWT token with a payload and set expiration to 1 hour
const payload = { user_id: 123, username: 'john_doe' };
const token = jwt.sign(payload, secret, { expiresIn: '1h' });

// Verify a JWT token
try {
    const decoded = jwt.verify(token, secret);
    console.log(decoded);
} catch (error) {
    console.error('Token verification failed.');
}