Exercise 1: Demonstrating req.body Is Undefined — Possible Solution
====================================================================

SETUP — NO express.json() REGISTERED
------------------------------
// server.js — no app.use(express.json()) anywhere
app.post('/api/pages/:id/title', (req, res) => {
  const { title } = req.body;
  res.json({ receivedTitle: title });
});

REQUEST
------------------------------
fetch('/api/pages/3/title', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ title: 'New Title' }),
});

OBSERVED RESULT
------------------------------
The server crashes with a real TypeError:
"Cannot destructure property 'title' of 'req.body' as it is
undefined." Even though a genuine, well-formed JSON body was sent,
req.body was never parsed into an object at all - it stayed
undefined the entire time, because no middleware existed to parse it.

WHY THIS WORKS AS AN ANSWER
------------------------------
It correctly sends a real JSON request with no express.json()
middleware registered, and correctly observes the resulting crash,
concrete proof that req.body genuinely doesn't exist without it.