Top 50 Most Asked MERN Stack Interview Questions and Answers for 2025 Now a days most of the IT Company asked NODE JS Question mostly in interview. I am creating this article to provide help to all MERN Stack developer , who is in doubt that which type of question can be asked in MERN Stack  then they can learn from this article. I am Shiva Gautam,  I have 15 Years of experience in Multiple IT Technology, I am Founder of Shiva Concept Solution Best Programming Institute with 100% Job placement guarantee. for more information visit  Shiva Concept Solution 1. What is the MERN Stack? Answer : MERN Stack is a full-stack JavaScript framework using MongoDB (database), Express.js (backend framework), React (frontend library), and Node.js (server runtime). It’s popular for building fast, scalable web apps with one language—JavaScript. 2. What is MongoDB, and why use it in MERN? Answer : MongoDB is a NoSQL database that stores data in flexible, JSON-like documents. It...

 what is MERN STACK: it is a combination of front-end,back-end,middleware and database technology.it is used to create dynamic web application. it is also called full stack web development based technology to create new era web based application. NODE js provide better performance and scalable environment to create API and connect with MONGO db database. it is most scalable environment in IT industry. React is used to design UI using HTML, CSS and JSX. M--> (Mongo DB) it is NO SQL based database E --> (Express JS) it is web framework that will work as a middleware between application and database. R --> (React JS)  it is JS library that is used to create dynamic user interface. N ---> (NODE JS) it is the runtime environment that provide database operation using javascript with mongodb. Learning path 1) UI --->  HTML + CSS + JS + REACT JS 2) BACKEND :-  NODE + MONGO DB, MYSQL 3) MIDDLEWARE:   EXPRESS JS 4) REDUX:- it is design pattern to crea...