How can I handle errors in async middleware?

How can I handle errors in async middleware?

You can handle errors in async middleware by using try-catch blocks or by passing errors to the next middleware.

Can you show me an example of using try-catch?

Sure! Here's a simple example:

app.use(async (req, res, next) => {
    try {
        // Your async code here
        await someAsyncFunction();
        next();
    } catch (error) {
        next(error); // Pass the error to the error handling middleware
    }
});

What about using promises instead of async/await?

You can handle errors in promises by using the .catch() method. Here's an example:

app.use((req, res, next) => {
    someAsyncFunction()
        .then(() => next())
        .catch(next); // Pass the error to the error handling middleware
});

How do I set up error handling middleware?

You can set up error handling middleware by defining a middleware function with four parameters: err, req, res, next. Here's an example:

app.use((err, req, res, next) => {
    res.status(500).send({ error: err.message });
});