Learn how to use the useEffect Hook in Next.js with 5 real-world examples — data fetching, DOM manipulation, timers, event listeners, and more! This tutorial is perfect for beginners and intermediate React/Next.js developers who want to fully understand how useEffect works and how to avoid common mistakes.
In this video, I break down useEffect step-by-step and demonstrate how it behaves inside a Next.js application using practical examples you can apply immediately in your projects.
⭐ What You’ll Learn
✔ What useEffect is and why it’s important
✔ How useEffect works in Next.js
✔ Data fetching using useEffect
✔ DOM manipulation examples
✔ Timers (setTimeout & setInterval)
✔ Event listeners (scroll, resize, etc.)
✔ Cleanup functions — why they matter
✔ Common mistakes and how to avoid them
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⏱️ Timestamps
0:00:00 – Introduction
0:00:38 – Project Setup
0:03:36 – useEffect Syntax Explained
0:06:20 – Example 1: useEffect on Mount
0:07:20 – Example 2: Data Fetching with useEffect
0:15:53 – Example 3: DOM Manipulation
0:20:18 – Example 4: Changing Document Title (DOM Manipulation)
0:25:30 – Example 5: Timers (setTimeout & setInterval)
0:28:46 – Outro
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