Node.js Interview Questions and Answers

Top 40 Node.js Interview Questions and Answers

Node.js (also known as Node or NodeJS) is a lightweight and efficient, event-driven JavaScript framework to build JavaScript web applications. In this article, you will see NodeJS related interview questions and their answers.

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Node.js Interview Questions and Answers

1. What is Node.js?

Node.js is a server-side JavaScript platform which is built on Google Chrome’s JavaScript V8 engine. It is an open source and cross-platform application to develop server-side and networking applications. Anyone can develop the Node.js application by writing code in JavaScript and it can be run on Microsoft Windows, Linux, or OS X.

2. Why use Node.js?

Node.js makes building scalable network programs easy. Some of its advantages include:

  • It is generally fast
  • It almost never blocks
  • It offers a unified programming language and data type
  • Everything is asynchronous
  • It yields great concurrency

3. What are the features of Node.js?

Here are the following key features of Node.js:

  • Real time Data intensive.
    Example – Multiplayer Games, Stock Trading, Chat App etc.
  • Highly scalable servers for Web Applications.
    Example – E-Commerce, Social Media, REST API etc.
  • Builds fast and scalable network Applications.
    Example – Proxy Server, Backend web services, HTTP Web Server etc.

Key features:

  • Event driven and Asynchronous.
  • No Buffering
  • Very Fast.
  • Single Threaded but highly Scalable.

4. What is Globals in Node.js?

Global, Process and Buffer are combinedly termed as Globals.
Global: It’s a global namespace object
Process: Its also a global object but it provides essential functionality to transform a synchronous function into a asynchronous callback.
Buffer: Raw data is stored in instances of the Buffer class.

5. Explain REPL in Node.js.

The REPL stands for Read Eval Print Loop, which is a simple program that accepts the commands, evaluates the commands, and prints their results. It represents a computer environment like Unix/Linux shell or a window console in which we can enter the command and the system responds with output. REPL performs the following tasks:

  • READ
    Read the input from user, parse it into JavaScript data structure and store it in memory.
  • EVAL
    Execute the data structure.
  • RINT
    Print the result
  • LOOP
    Loop the command until user presses Ctrl+C two time.

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Chandra Kumar

Hello World, I am Chandra Kumar from New Delhi, India. I am professionally developer, programmer and blogger. I am the founder of

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