🔍 StrictMode in React — Catch Problems Before They Happen

React.StrictMode is a development tool that helps identify potential problems in your React app. It does not affect production, only runs in development.

🎯 Why use StrictMode?
• Warns about unsafe lifecycle methods
• Detects unexpected side effects
• Highlights legacy code that may break in future versions
• Helps ensure best practices

🔧 How to enable:

import React from "react"; import ReactDOM from "react-dom/client"; import App from "./App"; const root = ReactDOM.createRoot(document.getElementById("root")); root.render( <React.StrictMode> <App /> </React.StrictMode> ); 

📌 Key points:
• Only affects development mode
• May render components twice (to detect side effects)
• No impact on production performance
• Encouraged for new React projects

React.StrictMode is like a safety net — it won’t fix your code but will warn you about risky patterns early.