14 articles found
Promises in JavaScript - How They Actually Work
Learn how JavaScript Promises actually work - the three states, chaining, error handling, Promise.all, race, any, and how they connect to async/await.
Callback Functions in JavaScript - Everything You Need to Know
Callbacks are everywhere in JavaScript and most developers use them without fully understanding what they are. This covers everything from first principles - sync vs async callbacks, error-first pattern, callback hell, and how they connect to Promises and async/await.
PostgreSQL vs MongoDB - How to Choose the Right Database for Your Project
PostgreSQL and MongoDB are fundamentally different databases. This guide explains how each works, how they handle relationships, schema, and transactions - so you can make the right choice instead of just going with whatever a tutorial used.
React vs Next.js: What's Actually Different and When to Use Which
React and Next.js are often confused - one is a UI library, the other is a full framework built on top of it. This post breaks down the real differences: rendering strategies, routing, API routes, and when to pick one over the other.
How the JavaScript Event Loop Actually Works - A Deep Dive
A complete deep dive into the JavaScript event loop - the call stack, callback queue, microtask queue, and how they work together to make async JavaScript possible.
How JWT Authentication Actually Works - Explained Properly
Most developers use JWT without really understanding how it works. This blog explains what's inside a JWT, how signature verification works without a database call, and how to implement it properly in Express with refresh tokens and role-based authorization.
How React's useEffect Actually Works - And Why Developers Misuse It
useEffect is one of the most used hooks in React and also one of the most misunderstood. This guide covers the dependency array, cleanup functions, the double render, and common mistakes that cause bugs.
Synchronous and Asynchronous in Node.js - How JavaScript Actually Handles Tasks
One of the most important concepts in Node.js and one of the most misunderstood. Covers the event loop, callbacks, Promises, and async/await with real examples.
SSR, CSR, SSG, and ISR in Next.js - What They Are and When to Use Each One
Next.js gives you four ways to render pages and each solves a different problem. This guide explains all four with real code examples and a practical decision guide.
HTTP Status Codes Explained - What They Actually Mean and Why Developers Should Know Them
Most developers know 200 and 404. But understanding the full range - and when to use them in your own APIs - makes you a noticeably better backend developer.
TypeScript vs JavaScript - What Is Actually Different and Should You Learn TypeScript
TypeScript and JavaScript are more related than most people think. This guide covers the real difference, core TypeScript features you need to know, and helps you decide whether to make the switch.
Node.js and Express.js - What They Are, How They Differ, and How They Work Together
Node.js and Express.js are not the same thing. This guide explains what each does, how they work together, and covers routing, middleware, and error handling with real code.