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50+ Node JS Coding Questions for Candidates Skills Evaluation

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09 March, 2023

Recruiters may face several challenges when asking Node JS coding questions to evaluate a candidate's skills. These include:

  • Inability to screen appropriate candidates for the job vacancy.
  • Inefficient screening processes and insufficient technical evaluation, depriving organizations of the most deserving candidates.
  • Difficulty in engaging candidates consistently.
  • Inability to measure the candidates' technical competencies.
  • Inability to evaluate their technical skills through live coding or programming interview assessments.

In addition to these challenges, it is important to note that Node JS is a vast framework. Therefore, it is challenging to cover all aspects in one coding question.

This is where a pre-employment skills assessment platform such as iMocha can help. It allows recruiters to choose from a wide variety of node js technical interview questions and narrow down the scope of the question, thereby evaluating the candidate's skills in a niche area.


Basic Node JS Coding Questions for Fresher and Juniors.

Recruiters can ask basic Node JS interview coding questions for fresher and junior candidates by focusing on fundamental concepts such as:

  • JavaScript basics:
    Since Node.js is built on top of JavaScript, it's essential to have a strong foundation in JavaScript concepts such as data types, functions, loops, and conditionals.
  • Node.js basics:
    Candidates should be
    familiar with Node.js basics, including modules, event-driven programming, callbacks, and error handling.
  • HTTP and web servers:
    Understanding HTTP, web servers, and their protocols is crucial for developing web applications using Node.js.
  • Express.js:
    Express.js is a popular web application framework used with Node.js, so questions about routing, middleware, and templating engines could be relevant.
  • Asynchronous programming:
    Node.js is known for its asynchronous programming capabilities, so recruiters can ask questions about asynchronous concepts such as promises, callbacks, and async/await.



Discover how iMocha's tailored assessments help you hire top-notch Node.js developers with precision. Experience our custom evaluation process designed specifically for Node.js expertise today! 



Let's now look at a few node js technical interview questions for freshers and juniors:

Q1. What is Node.js?

Q2. How does Node.js differ from other server-side technologies?

Q3. What is an event loop in Node.js?

Q4. What is a callback in Node.js? Can you provide an example?

Q5. What is a Promise in Node.js?

Q6. What is the difference between synchronous and asynchronous programming in Node.js?

Q7. What is a module in Node.js?

Q8. What is the difference between require and import statements in Node.js?

Q9. What is Express.js?

Q10. How do you install packages in Node.js?

Q11. What is NPM, and how does it work?

Q12. What is the difference between npm and npx?

Q13. How to handle errors in Node.js?

Q14. What is middleware in Express.js?

Q15. How do you handle file uploads in Node.js?

Q16. What is RESTful API, and how to create it using Node.js?

Q17. How do you implement authentication and authorization in Node.js?

Q18. What is WebSocket in Node.js?

Q19. What is the difference between Node.js and browser JavaScript?

Q20. Can you give an example of a Node.js project you have worked on?


The learning:

Hiring the right candidate for a Node.js role involves assessing their technical knowledge, experience, and problem-solving skills. Asking these questions can help recruiters identify candidates:

  • Who are familiar with Node.js and its related concepts
  • Who can effectively communicate their understanding
  • Who has experience working on Node.js projects

To improve the hiring experience, recruiters can also evaluate a candidate's coding skills and ability to work collaboratively. They can ask them to solve coding challenges and provide them with a coding task to get a more well-rounded understanding of the candidate's abilities and skills.


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

Node JS Coding Questions for Intermediate Candidates

Recruiters can ask Node JS coding questions for intermediate candidates in the following ways:

  • Start with basic coding questions:
    Recruiters can begin by asking simple coding questions related to Node JS concepts, such as event-driven programming, asynchronous programming, callbacks, and promises. This will help to evaluate the candidate's basic knowledge of the language.
  • Focus on intermediate-level concepts:
    Recruiters can then move on to intermediate-level concepts such as handling errors, working with databases, creating APIs, and implementing security measures.
  • Ask scenario-based questions:
    Recruiters can also ask scenario-based questions to assess how the candidate would approach and solve real-world problems using Node JS. For example, they could ask the candidate to write a program that reads data from a database and displays it on a webpage.
  • Provide a coding challenge:
    Another effective way to assess the candidate's coding skills is to provide a coding challenge. This could be a small project or a task that requires the candidate to use Node JS to solve a problem. It will help to evaluate their problem-solving skills and how they approach coding challenges.
  • Evaluate their knowledge of popular Node JS frameworks and libraries: Recruiters can also ask questions related to popular Node JS frameworks and libraries such as Express, Koa, and Socket.IO. This will help evaluate the candidate's familiarity with these tools and ability to use them to build applications.

Moving on, let's look at a few node js technical interview questions for intermediate, mid-level developers:

Q21. What is Node.js, and how is it different from other server-side technologies?

Q22. Explain the concept of event-driven programming in Node.js.

Q23. How do you handle errors in Node.js?

Q24. How do you create a server in Node.js?

Q25. How do you read and write files in Node.js?

Q26. What are streams in Node.js?

Q27. What is middleware in Node.js?

Q28. How do you create and use custom modules in Node.js?

Q29. How do you perform unit testing in Node.js?

Q30. Explain the concept of callbacks in Node.js.

Q31. How do you implement authentication and authorization in a Node.js application?

Q32. What is the purpose of the package.json file in Node.js?

Q33. How do you handle database connections in Node.js?

Q34. What is the purpose of the Express.js framework in Node.js?

Q35. Explain the concept of asynchronous programming in Node.js.

Q36. How do you use the npm package manager in Node.js?

Q37. What is the difference between process.nextTick() and setImmediate() in Node.js?

Q38. How do you deploy a Node.js application to a production server?

Q39. What are the best practices for securing a Node.js application?

Q40. How do you optimize the performance of a Node.js application?


The learning:

These questions can help recruiters to assess the candidate's knowledge and proficiency in Node.js. By evaluating the candidate's answers to these questions, recruiters can determine if the candidate possesses the necessary skills and experience to perform the job duties effectively.

In addition, asking these questions can help recruiters identify areas where the candidate may require additional training or support. By hiring the right candidate, recruiters can help ensure that their organization's Node.js applications are developed and maintained to a high standard, which can help improve the overall performance and reliability of their systems.


Advanced Node JS Coding Questions for Experienced Candidates

When asking Advanced Node.js coding questions for experienced candidates, recruiters should ensure that the questions are challenging enough to test the candidate's expertise in the subject matter while still being relevant to the position they are applying for.

Here are some tips on how to formulate Advanced Node.js coding questions for experienced candidates:

  • Focus on the candidate's experience:
    Senior candidates are expected to have extensive experience in Node.js, so the questions should be tailored to their level of expertise. For example, hiring managers can ask questions that require the candidate to optimize the performance of a Node.js application or to implement complex data structures using Node.js.
  • Use real-world scenarios:
    Try to use real-world scenarios or problems that are commonly encountered in the industry. This helps the candidate relate to the question and allows them to demonstrate their practical skills.
  • Cover multiple aspects of Node.js:
    Advanced Node.js coding questions for senior candidates should cover multiple aspects of Node.js, including the runtime environment, asynchronous programming, and debugging. This will help assess the candidate's overall proficiency in the language.
  • Encourage collaboration:
    It is important to remember that coding questions should be used as a tool to assess the candidate's skills, not to intimidate or trick them. Encouraging collaboration and providing the candidate with the opportunity to ask questions or seek clarification can help to create a positive interviewing experience.
  • Evaluate the candidate's problem-solving skills:
    Advanced Node.js coding questions for senior candidates should require the candidate to demonstrate their problem-solving skills. This will help them evaluate how well the candidate can work under pressure and come up with creative solutions to complex problems.
  • Use an online platform such as iMocha to get access to advanced Node.js coding challenges. This platform is a great resource for recruiters who want to test the skills of senior Node.js developers.



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).



Finally, let's look at a few node js technical interview questions for senior, experienced candidates:

Q41. What are streams in Node.js, and how can they be used?

Q42. What is clustering in Node.js, and how can it be used to improve application performance?

Q43. What are the differences between the "require" and "import" statements in Node.js?

Q44. How does Node.js handle asynchronous code execution, and what are the best practices for writing asynchronous code in Node.js?

Q45. What is the role of the "module" object in Node.js, and how can it be used to create reusable code?

Q46. What are the different types of Node.js modules, and how can they be used to build scalable applications?

Q47. How does Node.js handle errors, and what are some common error-handling techniques in Node.js?

Q48. How can Node.js be used to create real-time applications, such as chat applications or real-time dashboards?

Q49. What is GraphQL, and how can it be used with Node.js to build APIs?

Q50. What are some best practices for deploying Node.js applications, and how can Node.js be optimized for performance?

The learning:

These questions can help recruiters identify candidates with a deep understanding of Node.js and its core features. Candidates who can confidently answer these questions are more likely to have hands-on experience with Node.js and be able to build scalable, high-performance applications using Node.js.

Additionally, recruiters can evaluate the candidate's ability to explain technical concepts clearly and concisely, which is an essential skill for senior-level roles.


Tips for Interviewing and Evaluating Node JS Candidates to Build a Balanced Team

Here are some tips for interviewing and evaluating Node.js candidates to build a balanced team:

1. Technical Skills: Node.js developers should be proficient in JavaScript, Node.js, and other related technologies such as MongoDB, Express, React, and Redux.

Tips for Recruiters: Evaluate their technical skills by:

  • Asking them to write code during the interview
  • Give them a coding challenge to complete

2. Communication Skills: Node.js developers should have strong communication skills as they will need to work with other developers, stakeholders, and clients.

Tips for Recruiters: Evaluate the candidate's communication skills by:

  • Asking them to explain technical concepts in simple terms 
  • Conducting a role-playing scenario 

3. Problem-Solving Skills: Node.js developers should have strong problem-solving skills as they will often need to troubleshoot issues in their applications.

Tip for Recruiters: Evaluate the candidate's problem-solving skills by giving them a real-world scenario and asking them to come up with a solution.

4. Teamwork: Node.js developers should be able to work collaboratively with other developers, designers, and stakeholders.

Tips for Recruiters: Evaluate the candidate's teamwork skills by:

  • Asking them about their experience working on a team
  • Conducting a group interview

5. Experience: Node.js developers should have relevant work experience in developing and deploying Node.js applications.

Tips for Recruiters: Evaluate their experience by asking them about their previous projects and their role in those projects.

6. Attitude: Node.js developers should have a positive attitude and a willingness to learn and grow.

Tips for Recruiters: Evaluate their attitude by:

  • Asking them about their hobbies or interests outside of work
  • Enquiring how they have applied their skills and knowledge in those areas

7. Cultural Fit: Node.js developers should fit into the company culture and share the same values as the team.

Tips for Recruiters: Evaluate their cultural fit by asking them about their values and their experience working in a similar environment.
By evaluating these parameters, recruiters can hire the right team members and build a balanced team that can work efficiently and effectively.


Final Words

iMocha is an online assessment platform that offers a range of coding assessments to help evaluate candidates' skills in different programming languages, including Node.js.

The platform can help recruiters to assess the coding skills of candidates at different levels, from junior to senior, and build a strong Node.js team by providing two key features:


1. Live Coding Interview:

iMocha's Live Coding Interview allows hiring managers to assess candidates' coding skills in real-time. Hiring managers can create their own questions or use pre-built questions to test candidates on their knowledge of Node.js.
They can also evaluate how candidates approach problem-solving, their ability to work under pressure, and their communication skills. In addition, this feature helps recruiters to assess candidates' technical skills and evaluate their ability to work as part of a team.

2. Coding Simulator:

iMocha's Coding Simulator allows candidates to write code in an online IDE (Integrated Development Environment). They can create custom test scenarios, set time limits, and test candidates' skills in Node.js using real-world coding problems.
That's not all. The platform provides automatic evaluation and feedback, which can help candidates improve their coding skills. This feature also helps them to evaluate candidates' coding skills and assess their ability to write efficient and optimized code. 
All in all, iMocha offers a wide variety of skills assessment tests (such as HTML skills, CSS skills, etc.) to allow recruiters to hire for all related job roles. Try the platform and book a demo right away.


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. 


Payal Rajpoot
Payal Rajpoot
Payal Rajpoot is an experienced and extremely versatile SEO Content Writer at iMocha. Her extensive experience in the field comes from working with six different organizations and numerous national and international clients as a freelancer. She adapts easily to market demands to produce, create and manage content for SaaS B2B to B2C. Her content has helped organizations mark visible changes in website ranking. She has a unique predilection for food, books, and vision board, so she spends her leisure time discovering new recipes, binge-reading books, and creating enchanting mood boards.
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