NodeJS Interview Questions and Answers
Question - 41 : - What is the use of module.exports in Node.js?
Answer - 41 : - The module.exports function is used to expose two functions and bring them to a usable context. A module is an entity that is used to store relative code in a single snippet. This can be considered as an operation of moving all of the functions into one single file.
Question - 42 : - Why do you think you are the right fit for this Node.js role?
Answer - 42 : - Here, the interviewer wants to know your understanding of the job role and the company architecture and your knowledge on the topic. While answering this question, it would add immensely if you knew the job description in detail and the basic usage of the technology in the company. The answer can be further elaborated with how your interests align with the technology, job, and the company
Question - 43 : - Do you have any past Node.js work experience?
Answer - 43 : - This question is common among Node.js interviews. Make sure to answer it to the best of your abilities, and do not to bloat but give your honest experiences and explain how you’ve used Node.js before. This is used as a measure to see if you have had any hands-on experience with the language in a working environment before
Question - 44 : - Do you have any experience working in the same industry as ours?
Answer - 44 : - With this question, the interviewer is trying to assess if you’ve had any previous work experience or internship experience where you dealt with similar working environments or technologies. This line of questioning can be easily answered based on your previous experiences. Make sure to keep it concise and detailed as required when answering this question.
Question - 45 : - Do you have any certification to boost your candidature for this Node.js role?
Answer - 45 : - It is always advantageous to have a certification in the technology that you’re applying for. This gives the interviewer the impression that you have worked on the technology and that you are serious about using it for your career growth. More than this, it adds immense value to your resume and your knowledge on the topic at the same time.
Question - 46 : - If Node.js is single-threaded, then how does it handle concurrency?
Answer - 46 : -
The Multi-Threaded Request/Response Stateless Model is not followed by the Node JS Platform, and it adheres to the Single-Threaded Event Loop Model. The Node JS Processing paradigm is heavily influenced by the JavaScript Event-based model and the JavaScript callback system. As a result, Node.js can easily manage more concurrent client requests. The event loop is the processing model's beating heart in Node.js.
Question - 47 : - Explain callback in Node.js.
Answer - 47 : -
A callback function is called after a given task. It allows other code to be run in the meantime and prevents any blocking. Being an asynchronous platform, Node.js heavily relies on callback. All APIs of Node are written to support callbacks.
Question - 48 : - What are the advantages of using promises instead of callbacks?
Answer - 48 : -
- The control flow of asynchronous logic is more specified and structured.
- The coupling is low.
- We've built-in error handling.
- Improved readability.
Question - 49 : - How would you define the term I/O?
Answer - 49 : -
- The term I/O is used to describe any program, operation, or device that transfers data to or from a medium and to or from another medium
- Every transfer is an output from one medium and an input into another. The medium can be a physical device, network, or files within a system
Question - 50 : - How is Node.js most frequently used?
Answer - 50 : -
Node.js is widely used in the following applications:
- Real-time chats
- Internet of Things
- Complex SPAs (Single-Page Applications)
- Real-time collaboration tools
- Streaming applications
- Microservices architecture