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Why React.js useEffect called 2 times | React.js Strict mode #reactjs #react #mernstack #nodejs
In this video, we explain why useEffect in React sometimes runs twice and why you see duplicate console logs in development. This behavior is caused by React Strict Mode, which intentionally re-runs certain lifecycle methods to help detect side effects and potential bugs early. You’ll learn how Strict Mode works, when this double execution happens, and why it does not occur in production. This video is perfect for beginners and developers preparing for React interviews.
Видео Why React.js useEffect called 2 times | React.js Strict mode #reactjs #react #mernstack #nodejs канала codingBlaze
Видео Why React.js useEffect called 2 times | React.js Strict mode #reactjs #react #mernstack #nodejs канала codingBlaze
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20 января 2026 г. 21:41:40
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