Node.js Interview Questions and Answer for freshers

Categories: Interview questions and answers Freshers Node JS

Node.js Interview Questions and Answer for freshers

 

Q1. What is Node.js?

Answer: Node.js is a very popular scripting language that is primarily used for server-side scripting requirements. It has numerous benefits compared to other server-side programming languages out there, the most noteworthy one being the non-blocking I/O.

 

Q2. Briefly explain the working of Node.js.

Answer: Node.js is an entity that runs in a virtual environment, using JavaScript as the primary scripting language. It uses a simple V8 environment to run on, which helps in the provision of features like the non-blocking I/O and a single-threaded event loop.

 

Node.js is used in a variety of domains. But, it is very well regarded in the design of the following concepts:

 

Network application

Distributed computing

Responsive web apps

Server–Client applications

 

Q3. Why is Node.js single-threaded?

Answer: Node.js works on the single-threaded model to ensure that there is support for asynchronous processing. With this, it makes it scalable and efficient for applications to provide high performance and efficiency under high amounts of load.

 

Q4. What are the different API functions supported by Node.js?

Answer: There are two types of API functions. They are as follows:

 

Synchronous APIs: Used for non-blocking functions

Asynchronous APIs: Used for blocking functions

 

Q5. What is the difference between synchronous and asynchronous functions?

Answer: Synchronous functions are mainly used for I/O operations. They are instantaneous in providing a response to the data movement in the server and keep up with the data as per the requirement. If there are no responses, then the API will throw an error.

On the other hand, asynchronous functions, as the name suggests, work on the basis of not being synchronous. Here, HTTP requests when pushed will not wait for a response to begin. Responses to any previous requests will be continuous even if the server has already got the response.

 

Q6. What is the control flow function?

Answer: The control flow function is a common code snippet, which executes whenever there are any asynchronous function calls made, and they are used to evaluate the order in which these functions are executed in Node.js.

 

Q7: Why is Node.js so popular these days?

Answer: Node.js has gained an immense amount of traction as it mainly uses JavaScript.  

 

Q8. Writing JavaScript on the server

Answer: Access to the HTTP stack

File I/O entities

TCP and other protocols

Direct database access

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