app.post('/submit', (req, res) => {
  res.send('Data received');
});

app.put('/update/:id', (req, res) => {
  const productId = req.params.id;
  res.send(`Product ${productId} updated`);
});

app.delete('/delete/:id', (req, res) => {
  const productId = req.params.id;
  res.send(`Product ${productId} deleted`);
});