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React Developer

Interview questions for React, JavaScript, and TypeScript developers — core language concepts, hooks, state management, performance, system design, and best practices.

Questions

Topics

Est. Time

Topics

Choose a topic to start your interview preparation journey

JavaScript Core Concepts

Core JavaScript mechanics — the event loop, closures, prototypes, this-binding, promises, scoping, and memory.

7 Qs~22 min

ES6+ Features and Modern JavaScript

Modern JavaScript: arrow functions, destructuring, spread/rest, modules, async/await, and key browser APIs.

12 Qs~37 min

TypeScript Advanced Topics

Advanced TypeScript: type vs interface, generics, utility and mapped types, type guards, and inference.

6 Qs~39 min

React Architecture & Patterns

React component model, hooks, state management, performance, concurrent features, and rendering internals.

20 Qs~116 min

System Design & Architecture

Designing component libraries, code-splitting, testing, auth, and data-fetching layers at scale.

5 Qs~30 min

Coding Challenges

Hands-on coding challenges: debounce, custom hooks, HOCs, virtual scrolling, and form builders.

5 Qs~15 min

Behavioral & Scenario-Based

Behavioral and scenario-based questions on debugging, migrations, architecture, and code review.

5 Qs~16 min

Best Practices & Patterns

Best practices for side effects, API type safety, styling, i18n/a11y, and code-quality tooling.

5 Qs~24 min