How can I use async/await in Express.js?

How can I use async/await in Express.js?

You can use async/await in Express.js to handle asynchronous operations more cleanly. Just define your route handlers as async functions.

Can you show me a simple example?

Sure! Here's a basic example:

app.get('/data', async (req, res) => {
    try {
        const data = await fetchData();
        res.json(data);
    } catch (error) {
        res.status(500).send('Error fetching data');
    }
});

What happens if the promise is rejected?

If the promise is rejected, it will throw an error, which you can catch using a try/catch block, as shown in the example.

Is there a performance difference between callbacks and async/await?

Async/await can make your code cleaner and easier to read, but performance-wise, they are similar to promises. The choice often comes down to code maintainability.