What is asynchronous middleware and can you give me some examples?

What is asynchronous middleware and can you give me some examples?

Asynchronous middleware is a type of software that processes requests without blocking the execution of other operations. Examples include Express.js middleware in Node.js, which allows handling multiple requests simultaneously.

How does it improve performance in web applications?

It improves performance by allowing the server to handle other requests while waiting for I/O operations to complete, thus increasing throughput.

Can you show me a code example of asynchronous middleware?

Sure! Here's a simple example using Express.js:

app.use(async (req, res, next) => {
    const data = await fetchData(); // Simulate an async operation
    req.data = data;
    next(); // Pass control to the next middleware
});

What are some common use cases for asynchronous middleware?

Common use cases include handling API requests, processing files, and managing database queries where non-blocking operations are essential.