React Hook Converter

Name: Developer Quick Tools
Rating: 4.8 (1250 reviews)

Convert between Class Components and Functional Components with Hooks. Perfect for modernizing legacy codebases.

Class Component

Functional Component

function Counter({ title }) {
  const [count, setCount] = useState(0);
  const [name, setName] = useState('Counter');

  useEffect(() => {
    console.log('Component mounted');
    document.title = `Count: ${this.state.count}`;

    return () => {
      console.log('Component will unmount');
    };
  }, []);

  useEffect(() => {
    if (prevState.count !== this.state.count) {
      document.title = `Count: ${this.state.count}`;
  }, []);

  return (
      <div>
        <h1>{title}</h1>
        <p>Count: {count}</p>
        <button onClick={handleClick}>
          Increment
        </button>
      </div>
    );
}

Conversion Guide:

Class → Functional:

✓ this.state → useState
✓ componentDidMount → useEffect()
✓ componentDidUpdate → useEffect([deps])
✓ componentWillUnmount → useEffect cleanup
✓ Methods → Arrow functions

Functional → Class:

✓ useState → this.state
✓ useEffect([]) → componentDidMount
✓ useEffect([deps]) → componentDidUpdate
✓ useEffect cleanup → componentWillUnmount
✓ Arrow functions → Class methods

⚠️ Note: This converter handles common patterns but may need manual adjustments for:

• Complex lifecycle logic
• Context API usage
• Custom hooks or HOCs
• Advanced state management