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The Ultimate Guide to Mastering React's useEffect

· 13 min read
Evan Carter
Evan Carter
Senior frontend

TLDR:

Mastering React's useEffect

React’s useEffect is where side effects either become a clean synchronization layer—or turn into infinite loops, stale closures, and hidden coupling. This guide explains the render/commit model, how the dependency array really works, safe async data fetching with cleanup, and practical debugging tactics. You’ll also see how Feature-Sliced Design helps keep effects isolated, reusable, and scalable in large React codebases.