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Single-threaded nature of Node.js Node.js runs your JavaScript on one main thread. There's no parallel JS execution, no two lines of your code running simultaneously. One call stack. One flow. A proc
What Node.js is Node.js is a runtime environment that lets you run JavaScript outside the browser — on a server, your laptop, or anywhere else. Think of it this way: JavaScript was invented to make we
What this represents In JavaScript, this is a special keyword that refers to the execution context of a function – essentially, the object that is calling the function. this in global context At the t
What makes Node.js fast Most backend systems slow down because they wait. They wait for a database to return rows. They wait for a file to load. They wait for a remote API to respond. In a traditional
What Express.js is Express.js is a minimal, unopinionated web framework built on top of Node.js. It provides a thin layer of tools that make building web servers and APIs much easier without hiding ho
What middleware is in Express When a user sends an HTTP request to your Express app, it doesn't jump straight to your route handler. Instead, it passes through a series of checkpoints — these checkpoi
