This comprehensive guide covers 50 essential React.js interview questions that every developer should know. These questions cover fundamental concepts, hooks, performance optimization, and advanced patterns commonly asked in technical interviews.

## Core Concepts

Understanding React's core concepts is essential for any React developer. These questions test your knowledge of components, props, state, and the component lifecycle.

## React Hooks

Hooks revolutionized React development by allowing functional components to use state and lifecycle features. Master these questions to demonstrate your understanding of modern React patterns.

## Performance Optimization

React performance is crucial for building fast applications. These questions cover memoization, code splitting, lazy loading, and other optimization techniques.

## Advanced Patterns

Advanced React patterns include context API, error boundaries, render props, higher-order components, and custom hooks. These questions test your ability to solve complex problems.

Comprehensive collection of 50 essential React.js interview questions covering hooks, components, state management, performance, and advanced concepts.

React Interview Practice

What is React and what are its main features?