How do I set up JWT authentication in a Node.js Express app?

How do I set up JWT authentication in a Node.js Express app?

To set up JWT authentication, you'll need to install the necessary packages like jsonwebtoken and express-jwt. Would you like a step-by-step guide?

Yes, please provide the steps.

First, install the packages using npm: npm install jsonwebtoken express-jwt. Next, create a middleware function to verify the token.

How do I create the middleware function?

You can create a middleware function like this: 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) return res.sendStatus(403); req.user = user; next(); }); }.

What should I do after creating the middleware?

After creating the middleware, you can protect your routes by using it as a parameter in your route definitions. For example: app.get('/protected', authenticateToken, (req, res) => { res.send('This is a protected route!'); });.