How can I create custom middleware for my application?

How can I create custom middleware for my application?

Creating custom middleware involves defining a function that takes in a request, response, and next function. You can then add your logic and call the next function to pass control to the next middleware.

Can you give me an example of a simple logging middleware?

Sure! Here's a simple logging middleware:

function logger(req, res, next) {
    console.log(`${req.method} ${req.url}`);
    next();
}

This logs the HTTP method and URL of each request.

How do I use this middleware in an Express app?

You can use it in your Express app by adding it to your middleware stack like this:

const express = require('express');
const app = express();

app.use(logger);
// other routes and middleware