Hello readers 👋, welcome to the 14th blog in our Node.js series! In the last few posts, we built a complete file upload and serving system using Multer and Express. We learned how to accept files, store them safely, and serve them back via static URLs. Today, we're going to shift focus to something more subtle but equally important: how to extract information from the URL itself. Specifically, we'll talk about URL parameters and query strings in Express.js. You see these every day: URLs like /users/42 or /search?q=express&sort=asc . Knowing when to use a parameter (the 42 ) versus a query string (the ?q=express ) makes your API design cleaner and more intuitive. Let's break it all down with clear examples. Let's get started. What URL parameters are URL parameters (also called route parameters) are segments of the URL path that act as placeholders. They are part of the path itself and are typically used to identify a specific resource.…