CORS Explained Simply — Why Your Fetch Works in Postman but Fails in the Browser
Cross-Origin Resource Sharing in plain language: what blocks your request, what preflight means, and how to fix the errors you'll see in every frontend job.
6 min read1
Debounce vs Throttle — One Sentence to Remember Forever
Two patterns for taming fast events: debounce waits for silence, throttle limits how often. With examples, code, and interview answers.
4 min read
React useEffect Dependencies — The Bug That Keeps Coming Back
Why your effect reads old state, fires twice, or loops forever — and the simple rules to fix it (interview-ready).
6 min read1
React memo vs useMemo vs useCallback — When to Use Which
Three React APIs that all say 'memoize' — but they do different things. Clear explanations, examples, and a cheatsheet.
3 min read
CDN Explained: What It Is, How It Works, and How to Use It in Next.js
A CDN speeds up your app by serving assets from servers close to your users. Here's how it works and how Next.js takes advantage of it.
3 min read
Are TypeScript Enums a Good Idea? (Bundle Size & Runtime)
A practical guide to TypeScript enums, their runtime cost, and better alternatives for modern frontend apps.
3 min read
What is 'use client' in Next.js?
Understand 'use client' in Next.js App Router: what it means, when to use it, and how it works under the hood.
2 min read
Next.js Page Router vs App Router
Understand the key differences between the old Page Router and the new App Router in Next.js.
2 min read
React Higher-Order Components (HOC)
Understand Higher-Order Components (HOCs) in React with examples, use cases, downsides, and a comparison to hooks.
2 min read
JavaScript's Event Loop — Simple Guide (with SVG Timeline)
Event loop explained with a clean SVG timeline showing the actual execution order: Start → End → Promise → Timeout.
1 min read
React useRef vs useState — When to Use Which
A simple guide to understanding when to use useRef and useState in React, with examples, mental models, and a quick cheatsheet.
2 min read
Frontend Design Patterns — A Practical Guide
A concise, example‑driven overview of the most useful frontend patterns for modern React/Next.js apps.
4 min read
MVVM, Micro‑Frontends, and Domain‑Driven Frontend — A Practical Guide
Clear, practical explanations of MVVM, micro‑frontends, and domain‑driven design for modern React/Next.js teams, with examples, folder structures, and trade‑offs.
6 min read