React JS Interview Questions

Prepare for frontend interviews by diving deep into component lifecycles, state management, and modern server-side rendering techniques.

Beginner

Core Fundamentals

  • JSX Syntax & Virtual DOM
  • Props vs. State
  • Functional Components
  • Basic Hooks (useState, useEffect)
View Questions
Intermediate

Advanced Mechanics

  • Context API & Redux
  • Custom Hooks Architecture
  • React Router Mechanics
  • Component Lifecycle Nuances
View Questions
Expert

Architecture & Systems

  • React Fiber Architecture
  • useMemo/useCallback Optimizations
  • Next.js App Router & Server Actions
  • Micro-frontends
View Questions
Machine Round

Live Coding Challenge

Build a paginated data table with debounced search, sortable columns, and client-side caching using custom hooks.

Start Challenge Sandbox