Explore middleware in Express.js through this comprehensive Node.js tutorial for beginners. Learn about error handlers, custom loggers, built-in middleware, and third-party middleware implementation. Discover the concept of middleware, apply built-in middleware, create custom middleware, integrate third-party solutions, and develop a custom error handler. Understand the differences between app.use() and app.all(), and improve custom 404 route handling. Gain practical insights into Express.js middleware usage to enhance your web development skills.