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?MERN Stack Interview

The document outlines key topics and skills related to the MERN stack, including MongoDB, Express.js, React.js, and Node.js, along with their respective functionalities and integrations. It also highlights essential concepts in full stack development, authentication, security, and common interview questions for candidates. This serves as a comprehensive guide for preparing for MERN stack interviews.

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Arun Kumar
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15 views3 pages

?MERN Stack Interview

The document outlines key topics and skills related to the MERN stack, including MongoDB, Express.js, React.js, and Node.js, along with their respective functionalities and integrations. It also highlights essential concepts in full stack development, authentication, security, and common interview questions for candidates. This serves as a comprehensive guide for preparing for MERN stack interviews.

Uploaded by

Arun Kumar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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🔥MERN Stack Interview

M - MongoDB (Database)

●​ CRUD operations (Create, Read, Update, Delete)​

●​ Mongoose ORM (schemas, models, validation)​

●​ MongoDB aggregation pipeline (basics)​

●​ Relationships (One-to-Many, Many-to-Many)​

●​ Indexes and performance tips​

E - Express.js (Backend Framework)

●​ REST API creation (GET, POST, PUT, DELETE)​

●​ Middleware usage​

●​ Routing techniques​

●​ Error handling​

●​ JWT (JSON Web Token) authentication​

●​ CORS, body-parser, dotenv​

R - React.js (Frontend Library)

●​ Component-based architecture (functional + class components)​

●​ Props vs state​

●​ useState, useEffect, useRef, useContext​


●​ React Router​

●​ Controlled vs uncontrolled components​

●​ Lifting state up / React forms​

●​ Conditional rendering​

●​ Fetching API data (axios or fetch)​

N - Node.js (Runtime)

●​ Core modules: fs, http, path​

●​ Event loop, async/await, Promises​

●​ Express.js integration​

●​ Working with file systems (uploads using multer)​

●​ Environment variables​

●​ nodemon usage​

Full Stack Integration

●​ Connecting React frontend to Express backend​

●​ Axios / fetch to make API calls​

●​ Managing state across components (Context API / Redux)​

●​ Deployment concepts: hosting on Vercel (React) and Render/Heroku (Node +


MongoDB)​

●​ .env usage on both sides​


Authentication & Security

●​ Login / Registration with JWT​

●​ Password hashing with bcrypt​

●​ Authorization middleware​

●​ Securing routes​

Most Common Interview Questions


1.​ What is the difference between useEffect and useState?​

2.​ How do you handle form validation in React?​

3.​ How do you protect a route in Express.js?​

4.​ Explain how JWT works.​

5.​ What happens when you type a URL and hit Enter? (System design)​

6.​ How do you connect MongoDB with Node.js?​

7.​ What is a virtual DOM? Why is it important?​

8.​ How to handle CORS issues?​

9.​ How do you structure your MERN project?​

10.​How would you optimize a slow React app?​

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