React Interview Questions and Answers for Freshers
A practical React interview questions and answers guide for students, freshers, frontend developers, and MERN Stack learners. Learn React concepts like components, props, state, hooks, useEffect, routing, conditional rendering, lists, forms, and API integration.
Sponsored
Understand React fundamentals clearly
Prepare common React fresher interview questions
Explain components, props, and state properly
Revise useState and useEffect
Understand routing and API integration
Connect answers with real projects
Avoid theory-only answers
Question 1: What Is React
Best answer: React is a JavaScript library used to build user interfaces. It helps developers create reusable UI components and manage dynamic data efficiently. React is commonly used for single-page applications, dashboards, portals, admin panels, and interactive websites. Senior interviewer advice: Do not call React a full framework. It is mainly a UI library.
Question 2: What Are Components in React
Best answer: Components are reusable building blocks of a React application. A component can represent a button, navbar, card, form, page section, or complete page. Components help divide UI into smaller manageable parts, making code cleaner and reusable. Example: A job portal can have JobCard, Navbar, FilterSidebar, ApplicationForm, and Dashboard components. Senior interviewer advice: Give a project-based example. It shows practical thinking.
Question 3: Difference Between Props and State
Best answer: Props are used to pass data from a parent component to a child component. Props are read-only. State is used to manage data inside a component that can change over time. Example: A JobCard component may receive job title and company as props. A form component may use state to store input values. Senior interviewer advice: Mention that props are external data and state is internal component data.
Question 4: What Is useState
Best answer: useState is a React hook used to manage state in functional components. It returns the current state value and a function to update that value. Example: const [count, setCount] = useState(0); In real projects, useState is used for form inputs, modal open or close status, filters, selected tabs, and loading states. Senior interviewer advice: Always explain where you used it in a project.
Quick checklist
Sponsored