How do I handle asynchronous errors in Express?

How do I handle asynchronous errors in Express?

In Express, you can handle asynchronous errors by using middleware. You can create a custom error-handling middleware that catches errors from async functions.

Can you show me an example of that?

Sure! You can use a try-catch block in your async route handlers and pass errors to the next function. Here's a simple example:

app.get('/route', async (req, res, next) => {
    try {
        // Your async code here
    } catch (error) {
        next(error);
    }
});

What about using promises instead of async/await?

You can also handle errors in promises by using the .catch() method. For example:

app.get('/route', (req, res, next) => {
    someAsyncFunction()
        .then(result => res.send(result))
        .catch(next);
});