Description: Document middleware in web applications is a fundamental tool that allows processing requests related to documents. This type of middleware acts as an intermediary between the client’s request and the server’s response, facilitating the manipulation and management of files such as PDFs, images, or text files. Its main function is to intercept incoming requests, allowing operations such as validation, parsing, and transformation of data before they reach the application’s specific routes. This not only improves the efficiency of document handling but also allows for greater modularity and code reuse. By integrating document middleware, developers can implement features like file uploads, format conversions, and error management more easily and organized. This middleware can be customized to fit the specific needs of the application, making it a versatile and powerful tool for modern web application development.