Why is my React component not re-rendering after state update?

Solution

1. State Mutation: Ensure you are not mutating the state directly. Always use the setter function:

   const [count, setCount] = useState(0);
   setCount(count + 1); // ✅ Correct
   

   instead of:

   count++; // ❌ Wrong (mutating state)
   

2. Same State Value: If React sees the new state as identical to the previous one, it won’t trigger a re-render. Try logging the state values to check.
3. Asynchronous Updates: React batches state updates. If you’re setting state inside an event handler, wrap it in a function:jsx

   setCount(prevCount => prevCount + 1);
   

4. Component Not Re-Rendering: If you are using React.memo or PureComponent, check if props/state are actually changing.