const express = require('express');
const app = express();
const port = process.env.PORT || 3000;

app.get('/api/data', async (req, res) => {
  try {
    const data = await fetchDataFromDatabase();
    res.json(data);
  } catch (error) {
    res.status(500).json({ error: 'Internal Server Error' });
  }
});

app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

A simple Express.js API endpoint