Short posts with code and diagrams. Readable in minutes.
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.
Two patterns for taming fast events: debounce waits for silence, throttle limits how often. With examples, code, and interview answers.
Why your effect reads old state, fires twice, or loops forever — and the simple rules to fix it (interview-ready).
Three React APIs that all say 'memoize' — but they do different things. Clear explanations, examples, and a cheatsheet.
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.
A practical guide to TypeScript enums, their runtime cost, and better alternatives for modern frontend apps.
Understand 'use client' in Next.js App Router: what it means, when to use it, and how it works under the hood.
Understand the key differences between the old Page Router and the new App Router in Next.js.