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Expert-Approved 30 Node JS Interview Questions for Freshers

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11 March, 2023

Node JS Interview question

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Finding a Node JS developer can be difficult due to high demand, competition, specific skill requirements, and remote work preferences.

The task can become even more challenging if recruiters are looking for someone with specific skills and experience or want to hire freshers but don't know where to begin.

Some of the key challenges that recruiters may face during the hiring process include:

  • Bulk evaluation, which may cause issues in identifying qualified candidates with the right skills from campus and institute recruitments.
  • Inability to screen job-fit candidates for the job vacancy.
  • Inefficient screening processes and insufficient technical evaluation, depriving organizations of the most deserving candidates.
  • Difficulty in consistently engaging candidates.
  • Inability to measure the technical competencies of candidates.
  • Inability to evaluate technical skills through live coding/programming interview assessment.

To make the hiring process a little more streamlined and efficient, hiring managers must leverage iMocha's Node.js online test, which increases the interview-to-selection ratio by up to 62%.

Further, in this guide, we have curated a list of the top 30 Node JS interview questions for freshers that hiring managers can personalize and deliver an exceptional hiring experience.


Key Skills Required for Node JS Freshers

Technical Skills:

The Node JS fresher should have the following technical skills:

  • Knowledge of Node.js framework: They should have a basic understanding of the different Node.js frameworks such as Express.js, Koa.js, Hapi.js, etc. Plus, they should be able to work with these frameworks to develop server-side applications.
  • Proficiency in JavaScript: Node.js is built on top of JavaScript, so the fresher should have a strong foundation in JavaScript programming language. They should also be familiar with core JavaScript concepts like variables, data types, control structures, functions, objects, and arrays.
  • Knowledge of Node.js modules: Node.js comes with a vast collection of built-in modules that make it easy to perform various tasks. They should be familiar with these modules and know how to use them to build Node.js applications.
  • Understanding of Asynchronous programming: Node.js is designed to handle a large number of concurrent requests. The fresher should have an understanding of how to write asynchronous code in Node.js using callbacks, promises, and async/await.
  • Knowledge of APIs and RESTful web services: The Node JS fresher should have a good understanding of APIs and RESTful web services. They should know how to create APIs using Node.js and how to consume APIs in Node.js applications.
  • Basic understanding of front-end technologies: Node.js developers will also need to work closely with front-end developers. Therefore, they should have a basic understanding of front-end technologies like HTML, CSS, and JavaScript.
  • Familiarity with databases: Node.js can work with various databases like MongoDB, MySQL, PostgreSQL, etc. As a result, freshers should have a basic understanding of databases and know how to work with them in Node.js applications.
  • Knowledge of version control systems: Freshers should be familiar with version control systems like Git, SVN, etc. They should also know how to use Git for code management and collaboration.
  • Familiarity with DevOps tools: Finally, they should be familiar with DevOps tools like Jenkins, Docker, Kubernetes, etc. Plus, they should also know how to deploy and manage Node.js applications in a production environment.

As a hiring manager, having one-click access to expert-approved skills tests can be a time savior. Take a look at iMocha's skills test library and hire highly-qualified Node JS freshers.

Soft Skills:

  • Communication Skills: Communication is a crucial skill that every Node JS developer should have. They should be able to communicate effectively with the team members, managers, and clients to ensure everyone is on the same page.
  • Problem-solving Skills: A Node JS developer will encounter various problems that need to be solved. They should have the ability to identify problems, analyze them, and come up with effective solutions.
  • Time Management Skills: The developer should be able to manage their time effectively to complete tasks within the given time frame. They should also be able to prioritize tasks based on their urgency and importance.
  • Documentation skills: Documentation is a critical part of software development, and Node JS is no exception. Developers will be required to document their work, including code, project specifications, and other relevant information. Good documentation skills will help a developer communicate effectively with the team and clients and make it easier for others to understand and maintain code.

Niche roles require niche assessments to hire skill-fit candidates. Learn how iMocha creates custom assessments for any and all job roles.



20 Basic Node JS Interview Questions for Freshers

Let's look at the top 20 Node JS interview questions for freshers hiring managers can use to their advantage and hire the right candidate:

Q1. How does Node.js function? What is it?

Q2. What characteristics does Node.js have?

Q3. Describe NPM.

Q4. What does a Node.js event loop do?

Q5. In Node.js, what is a callback?

Q6. In Node.js, what is a Promise?

Q7. What kinds of streams does Node.js support?

Q8. What distinguishes blocking code from non-blocking code?

Q9. What does a Node.js module do?

Q10. How are Node.js apps debugged?

Q11. How does Node.js read and write files?

Q12. How does Express.js function, and what is it?

Q13. What does Express.js' middleware do?

Q14. What distinguishes PUT from POST in Express.js?

Q15. RESTful API: What is it?

Q16. In Node.js, what is

Q17. How does Node.js handle errors?

Q18. What does Node.js' REPL mean?

Q19. What does Node.js clustering mean?

Q20. What distinguishes Node.js's development and production environments?

Here's a handy guide on how to hire Node JS developers and spot the top candidates.


10 Comparative Node JS Basic Interview Questions Worth Considering

Now that we have looked at the important Node JS interview questions for freshers, let's deep-dive to understand a few comparison questions to consider:

Q21. What is the difference between Node.js and JavaScript?

JavaScript is a scripting language that can be used both on the front-end (client-side) and back-end (server-side) of web applications. Node.js is a runtime environment that allows developers to run JavaScript code on the server side.

Q22. How does Node.js differ from traditional server-side scripting languages like PHP?

Node.js is event-driven and non-blocking, which means it can handle a large number of requests without slowing down the application.

Traditional server-side scripting languages like PHP are blocking, which means each request is handled one at a time, making them slower in handling large numbers of requests.

Q23. How does Node.js compare to other server-side JavaScript frameworks like Express?

Express is a web application framework for Node.js, which provides a set of tools and utilities for building web applications. Node.js is a runtime environment that allows developers to run JavaScript code on the server side.

Express is built on top of Node.js and provides a more streamlined way of building web applications.

Q24. What is the difference between Node.js and Deno?

Deno is a secure runtime environment for JavaScript and TypeScript, similar to Node.js. However, Deno has some significant differences, such as better security features and built-in support for TypeScript, which is not available in Node.js.

Q25. How does Node.js differ from traditional multi-threaded server-side programming languages?

Traditional multi-threaded server-side programming languages like Java and C# use threads to handle multiple requests simultaneously.

Node.js, on the other hand, uses a single-threaded, event-driven architecture that allows it to handle multiple requests without the need for multiple threads.

Q26. What is the difference between Node.js and AJAX?

AJAX (Asynchronous JavaScript and XML) is a technique for making asynchronous HTTP requests from a web page using JavaScript.

Node.js, on the other hand, is a runtime environment that allows developers to run JavaScript code on the server side.

Q27. How does Node.js compare to PHP in terms of performance?

Node.js is generally faster than PHP in terms of handling requests and serving content. This is because Node.js is event-driven and non-blocking, while PHP is blocking.

Q28. What is the difference between Node.js and Ruby on Rails?

Ruby on Rails is a web application framework for the Ruby programming language, while Node.js is a runtime environment for JavaScript. Both can be used to build web applications, but they have different syntaxes and architectures.

Q29. How does Node.js compare to Python in terms of popularity?

Node.js and Python are both popular programming languages, but Node.js has seen a significant increase in popularity in recent years due to its event-driven, non-blocking architecture, which is well-suited for building real-time web applications.

Q30. What is the difference between Node.js and Angular?

Node.js is a runtime environment for JavaScript, while Angular is a front-end framework for building single-page applications using HTML, CSS, and JavaScript.


Tips for Interviewing Node JS Freshers

When it comes to interviewing a Node.js fresher, here are some key parameters recruiters must consider:

Tip #1: Node.js Fundamentals

The candidate should have a good understanding of Node.js and its core concepts, such as asynchronous programming, event-driven architecture, and Node.js APIs. 

Tip #2: JavaScript Proficiency 

Node.js is built on top of JavaScript, so the candidate should have a good grasp of JavaScript concepts, such as functions, closures, objects, and prototypes.

Tip #3: Problem-Solving Skills

Node.js developers should be able to identify problems and provide effective solutions. During the interview, ask the candidate to solve some coding challenges or provide real-life scenarios that test their problem-solving skills.

Tip #4: Familiarity with Node.js Frameworks

Node.js has many popular frameworks, such as Express.js, Hapi.js, and Koa.js. Candidates should be familiar with at least one of these frameworks.

Tip #5: Experience with Database Systems

Node.js is often used with database systems such as MongoDB, MySQL, and PostgreSQL. Candidates should have some experience with at least one of these database systems.

Tip #6: Version Control Systems

Version control systems such as Git are essential for collaboration and project management. Candidates should be familiar with Git and have experience with version control systems.

Tip #7: Communication Skills

Communication skills are essential for any job. During the interview, assess the candidate's ability to communicate technical concepts clearly and effectively.

Tip #8: Learning Ability

Node.js is a rapidly evolving technology, so candidates should have a strong willingness to learn and keep up-to-date with the latest trends and developments.

The takeaway: By evaluating these key parameters, recruiters can identify the right fresher for the Node.js team. Remember to also consider their cultural fit with the team, their work ethics, and their motivation to work with Node.js.

Browse through iMocha's HTML5 test, an ideal pre-hire assessment for recruiters to evaluate a candidate's HTML knowledge.



Hiring time skyrocketing for niche roles? Learn how iMocha can cut hiring time by 50% for all roles (and help you save over 60% in hiring costs).



Leverage iMocha: A Centralized Platform with Node JS Basic Interview Questions for Freshers

iMocha is an online assessment platform that offers a wide range of pre-built skill tests for various programming languages, including Node JS.

Here are some ways in which iMocha can help in assessing the skills of Node JS freshers in campus recruitment or coaching institutes recruitment:

  • Pre-built assessments: iMocha has pre-built assessments for Node JS that are designed to evaluate the proficiency of candidates in various aspects of the language, including core concepts, libraries, and frameworks.
  • Custom assessments: iMocha allows recruiters to create custom assessments for Node JS that can be tailored to their specific requirements. They can select the topics that they want to test the candidates on, set the difficulty level of the questions, and even set a time limit for the assessment.
  • Automated evaluation: iMocha's platform uses advanced algorithms to automatically evaluate the assessments and provide recruiters with detailed reports on each candidate's performance. This saves a lot of time and effort that would otherwise be spent manually grading the assessments.
  • Detailed reports: The platform provides detailed reports on each candidate's performance, including their scores, time taken to complete the assessment, and areas where they performed well or poorly. This helps hiring managers identify the strengths and weaknesses of each candidate and make informed decisions about their suitability for the role.
  • Remote assessments: iMocha's platform allows recruiters to conduct assessments remotely, which is especially useful in the current pandemic situation. This means they can assess candidates from anywhere in the world without having to worry about travel or logistics.

Overall, iMocha can be a valuable tool for assessing the skills of Node JS freshers in campus recruitment or coaching institutes recruitment, providing hiring managers with accurate and detailed insights into each candidate's proficiency in the language. Recruiters can leverage the skills assessment tests to hire for all related job roles.


Assess any skill, we mean it! Learn how you can create custom assessments with iMocha and check your candidate's domain, functional and cognitive skills – all using one assessment.


Gemma Benny
Gemma Benny
I am a Content Writer at iMocha. A B2B writer that creates articles and listicles while trying to build a relationship with potential clients and also adding value to the content wherever possible. I have previously worked with clients in the medical, fashion, education, IT, and beauty domains. Before joining as a full-time writer, I worked as a digital marketer for over two years. When I am not keeping busy with content writing, you can find me baking, exploring the culinary world, and playing badminton.
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Topics: Tech Recruitment

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