<!-- BEGIN COPY / PASTE -->
    // Example of securing an API endpoint with JWT in Node.js
    const express = require('express');
    const jwt = require('jsonwebtoken');
    const app = express();

    const authenticateJWT = (req, res, next) => {
      const token = req.header('Authorization');
      if (token) {
        jwt.verify(token, 'your-256-bit-secret', (err, user) => {
          if (err) {
            return res.sendStatus(403);
          }
          req.user = user;
          next();
        });
      } else {
        res.sendStatus(401);
      }
    };

    app.get('/secure-endpoint', authenticateJWT, (req, res) => {
      res.send('This is a secure endpoint');
    });

    app.listen(3000);
    <!-- END COPY / PASTE -->