React Interview Handbook with Ankita Budhia

Know React, but find it difficult to explain your answers in an interview?

You might know how to use useEffect or update state, but interviews often go deeper. Why did the component re-render? What caused the stale closure? How would you stop an old API response from replacing the latest search results?

The React Interview Handbook brings concepts, code examples, follow-up answers and coding practice together to help you prepare for these conversations.

📘 154 pages, 120 interview questions and 6 coding labs

Created for junior to mid-senior developers preparing for React developer, frontend developer and software engineer interviews at product-based companies and MNCs.

What makes this handbook useful?

You get 100 core React interview questions and 20 bonus questions. Each question includes:

1. A clear answer you can practise explaining in your own words.
2. A code example or practical approach.
3. An explanation of how the example works.
4. A follow-up question with its answer.
5. A common mistake to watch out for.

You can understand the concept, see it in code and prepare for the deeper questions that may follow.

React fundamentals and advanced concepts

The handbook covers React components, JSX, props, state management, conditional rendering, list keys, React Hooks and custom Hooks.

Revise useState, useEffect, useRef, useReducer, useMemo, useCallback, dependency arrays, Effect cleanup and stale closures.

It also covers controlled and uncontrolled components, form validation, event handling, accessibility, portals and reusable component patterns.

API integration and state management

Learn how to discuss REST API integration, data fetching, loading and error states, request cancellation, race conditions, caching, optimistic UI, pagination, infinite scrolling and client-side routing.

Explore Context API, Redux, Redux Toolkit, middleware, thunks, selectors and the difference between client state and server state.

The handbook also explains server-side rendering, client-side rendering, static generation, hydration, Server Components, Suspense and React 19+ features. Version-specific examples are clearly marked.

🛠️ Six hands-on React coding labs

Practise applying the concepts through:

1. A debounced value Hook
2. A data-fetching Hook.
3. A single-open accordion
4. Client-side pagination
5. A todo reducer
6. A native dialog

Each lab includes requirements, sample implementation, a solution explanation, edge cases to check and related questions to revise.

🔍 Code-output questions and debugging scenarios

Work through state-update queues, delayed callbacks, stale closures, index-key bugs and infinite Effect loops.

The explanations help you understand what happens, why it happens and how to fix it. This is useful for React technical interviews where you need to explain your reasoning while reading unfamiliar code.

💼 Practical questions from real application work

Prepare to discuss situations such as:

1. A search box displaying outdated results.
2. A form saving successfully but its response timing out.
3. Duplicate submissions and safe retries.
4. A large editable table becoming slow.
5. A route failing after a browser refresh.
6. Hydration mismatches.
7. WebSocket updates and reconnection.
8. Saved drafts and optimistic update failures.

You will also find questions on component architecture, TypeScript, security, error boundaries, React Testing Library, asynchronous testing and accessibility testing.

⏱️ Quick revision before your interview

When your interview is close, use:

1. A 60-minute revision plan.
2. Comparison sheets for commonly confused concepts.
3. Summaries of rendering and Effect pitfalls.
4. A React machine-coding checklist.
5. A clickable question index and PDF bookmarks.
6. Official documentation links for further reading.

👩‍💻 Who is this for?

This handbook is for developers who know basic JavaScript and React and want a structured resource for React interview preparation.

It is especially useful if you can build features but struggle to explain how they work, answer follow-up questions or discuss design choices.

📥 What you receive

A downloadable React Interview Handbook PDF by Coding with Ankita, including 120 questions, answered follow-ups, explained examples, six coding labs and revision resources.

Read it topic by topic, practise the code and revisit the key concepts before your next frontend interview.