How can I implement async middleware in my application?

How can I implement async middleware in my application?

You can implement async middleware by using async functions in your middleware stack. For example, in Express.js, you can define your middleware like this: const myMiddleware = async (req, res, next) => { ... }.

What are the benefits of using async middleware?

Async middleware allows you to handle asynchronous operations more efficiently, such as database calls or API requests, without blocking the event loop.

Can you give me an example of async middleware in Express?

Sure! Here's a simple example:

app.use(async (req, res, next) => {
  const data = await fetchData();
  req.data = data;
  next();
});

This middleware fetches data asynchronously and attaches it to the request object.

Are there any common pitfalls to avoid?

Yes, one common pitfall is forgetting to call next() after your async operation, which can lead to hanging requests. Always ensure that you handle errors properly as well.