Q41: Authentication layer with JWT and Refresh Tokens. - Node.js & Libuv

In Simple Words:

Authenticate credentials -> Issue Access Token (short-lived, 15m) and Refresh Token (long-lived, 7d).
Store Refresh Token in HttpOnly, Secure, SameSite=Strict Cookie.
Middleware verifies Access Token signature and extracts claims on incoming requests.

javascript

const jwt = require('jsonwebtoken');

function authMiddleware(req, res, next) {
  const token = req.headers.authorization?.split(' ')[1];
  if (!token) return res.status(401).json({ error: 'Unauthorized' });
  try {
    req.user = jwt.verify(token, process.env.JWT_SECRET);
    next();
  } catch (err) {
    res.status(403).json({ error: 'Token invalid or expired' });
  }
}