MERN Stack Interview Questions (2024)

1. What is the MERN Stack?

2. How does each layer of the MERN stack works?

3. What makes the MERN stack the preferable framework?

4. What is Express web framework in MERN Stack?

5. What is Node js in MERN Stack?

6. What are the benefits of using Node js in MERN Stack?

7. What part does Mongoose have in MERN Stack?

Q: What is the MERN Stack?
Ans:

MongoDB (document database), Express (Node.js web framework), React js (client-side JavaScript framework), and Node (JavaScript web server) are the initials for the four core components of the stack, collectively referred to as MERN.

Q: How does each layer of the MERN stack works?
Ans:

The MERN architecture makes it simple to build a three-tier architecture (front end, back end, and database) completely from JavaScript and JSON.

1. React.js tier

   It is the front end layer. React.js is a declarative JavaScript framework for creating dynamic client-side HTML applications, which render data by connecting to the backend server.

2. Express.js (backend) and Node.js server tier

   Express is a popular open-source node web framework written in JavaScript and running inside the Node.js environment. Express.js includes efficient models for URL routing , which matches an incoming URL with a server function and processing HTTP requests (GETs, or POSTs) received from React.js front end and it responses accordingly.

3. Database tier

   MongoDB can be used to store the application data in JSON documents format. It can be received from front end -> back end -> database

Q: What makes the MERN stack the preferable framework?
Ans:

With JavaScript and JSON, the MERN stack makes it simple to build and understand the entire application. The MERN stack enables users to build powerful applications. The Javascript framework and MongoDB make the data flow fast between the three tier layer architecture.

Q: What is Express web framework?
Ans:

Express is a popular open-source node web framework written in JavaScript and running on the Node.js environment.

Q: What is Node js in MERN Stack?
Ans:

Node (or Node.js) is an open-source, cross-platform runtime environment that allows JavaScript developers to create a variety of server-side tools and apps. The runtime is designed to be used outside of a browser (i.e. running directly on a computer or server OS).

Q: What are the benefits of using Node js in MERN Stack?
Ans:

Node js has several benefits:

1. The node package manager (NPM) gives access to hundreds of thousands of reusable packages.
2. Node.js is a portable programming language. Microsoft Windows, macOS, Linux, Solaris, FreeBSD, OpenBSD, WebOS, and NonStop OS are all supported.
3. Excellent performance! Node was created with the goal of increasing performance and scalability in web applications.

Q: What part does Mongoose have in MERN Stack?
Ans:

Mongoose is a MongoDB and Node.js based Object Data Modeling (ODM) library. It keeps track of data relationships, does schema validation, and converts code objects into MongoDB representations.