Quick Tip: JWT Authentication Basics

Quick Tip

JWT authentication basics:

// Generate JWT
const jwt = require('jsonwebtoken');
const token = jwt.sign({ userId: 1 }, 'secret', { expiresIn: '1h' });

// Verify JWT
const decoded = jwt.verify(token, 'secret');

// Middleware
const auth = (req, res, next) => {
  const token = req.headers.authorization?.split(' ')[1];
  if (!token) return res.status(401).json({ error: 'No token' });

  try {
    const decoded = jwt.verify(token, 'secret');
    req.userId = decoded.userId;
    next();
  } catch (err) {
    res.status(401).json({ error: 'Invalid token' });
  }
};

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