How React's Virtual DOM Works Under the Hood
A step-by-step breakdown of the mechanism that makes React fast: from the problem of slow DOM manipulation to the render, diff, and commit lifecycle. The Problem: Direct DOM Manipulation Is Expensiv
Latest articles
Blocking vs Non-Blocking Code in Node.js
A few months into running a Node.js API in production, you notice something odd. CPU usage looks fine, memory is stable, yet requests start timing out under load. You add more logs, profile the system
REST API Design Made Simple with Express.js
A few months into building a backend, most developers hit the same wall. The API works, but it feels messy. Routes like /getUserData and /createNewUserNow start piling up, and suddenly nothing feels p
The Node.js Event Loop Explained
A developer I worked with once hit a wall after learning that Node.js is single-threaded. His assumption was simple: one thread means one request at a time. Yet his API was handling hundreds of concur
Why Node.js is Perfect for Building Fast Web Applications
A few years ago, a developer I worked with was choosing a backend for a new API. Someone told him, “Just use Node.js, it’s fast.” He nodded, but didn’t really know what that meant. Faster than what? A
What is Middleware in Express and How It Works
A few years back, I was debugging an Express API where a simple GET /users request was returning a 401 error. The route handler looked fine. The bug wasn’t there. It turned out three different functio
What is Node.js? JavaScript on the Server Explained
A frontend developer once told me, “I know JavaScript well… but only inside the browser.” Then they saw a backend project written entirely in JavaScript and assumed it was some kind of hack. It wasn’t
JWT Authentication in Node.js Explained Simply
A developer ships a simple API with login support. Everything works fine until they hit a basic question: how does the server remember who the user is after login? HTTP requests are stateless. Each re
Creating Routes and Handling Requests with Express
You start with Node’s built-in http module thinking, “this should be simple.” A few routes later, you are manually parsing URLs, checking methods, writing conditionals everywhere, and duplicating logi