How do I handle errors in JWT authentication with Node.js?

How do I handle errors in JWT authentication with Node.js?

To handle errors in JWT authentication, you can use try-catch blocks and check for specific error types.

What specific errors should I look for?

You should look for errors like 'TokenExpiredError', 'JsonWebTokenError', and 'NotBeforeError'.

Can you show me a code example?

Sure! Here's a basic example:

const jwt = require('jsonwebtoken');

function authenticateToken(req, res, next) {
    const token = req.headers['authorization'];
    if (!token) return res.sendStatus(401);

    jwt.verify(token, process.env.ACCESS_TOKEN_SECRET, (err, user) => {
        if (err) {
            if (err.name === 'TokenExpiredError') {
                return res.status(403).send('Token has expired.');
            }
            return res.status(403).send('Invalid token.');
        }
        req.user = user;
        next();
    });
}

This code checks for token validity and handles errors accordingly.