NodeJS Interview Questions and Answers
Question - 51 : - What is NPM?
Answer - 51 : -
NPM stands for Node Package Manager, responsible for managing all the packages and modules for Node.js.
Node Package Manager provides two main functionalities:
- Provides online repositories for node.js packages/modules, which are searchable on search.nodejs.org
- Provides command-line utility to install Node.js packages and also manages Node.js versions and dependencies
Question - 52 : - What is the purpose of the module .Exports?
Answer - 52 : -
In Node.js, a module encapsulates all related codes into a single unit of code that can be parsed by moving all relevant functions into a single file. You may export a module with the module and export the function, which lets it be imported into another file with a needed keyword.
Question - 53 : - Why is Node.js preferred over other backend technologies like Java and PHP?
Answer - 53 : -
Some of the reasons why Node.js is preferred include:
- Node.js is very fast
- Node Package Manager has over 50,000 bundles available at the developer’s disposal
- Perfect for data-intensive, real-time web applications, as Node.js never waits for an API to return data
- Better synchronization of code between server and client due to same code base
- Easy for web developers to start using Node.js in their projects as it is a JavaScript library
Question - 54 : - Which database is more popularly used with Node.js?
Answer - 54 : -
MongoDB is the most common database used with Node.js. It is a NoSQL, cross-platform, document-oriented database that provides high performance, high availability, and easy scalability.
Question - 55 : - What are some of the most commonly used libraries in Node.js?
Answer - 55 : -
There are two commonly used libraries in Node.js:
- ExpressJS - Express is a flexible Node.js web application framework that provides a wide set of features to develop web and mobile applications.
- Mongoose - Mongoose is also a Node.js web application framework that makes it easy to connect an application to a database.
Question - 56 : - What does event-driven programming mean?
Answer - 56 : -
An event-driven programming approach uses events to trigger various functions. An event can be anything, such as typing a key or clicking a mouse button. A call-back function is already registered with the element executes whenever an event is triggered.
Question - 57 : - Differentiate between process.nextTick() and setImmediate()?
Answer - 57 : -
The distinction between method and product. This is accomplished through the use of nextTick() and setImmediate(). next Tick() postpones the execution of action until the next pass around the event loop, or it simply calls the callback function once the event loop's current execution is complete, whereas setImmediate() executes a callback on the next cycle of the event loop and returns control to the event loop for any I/O operations.
Question - 58 : - What is an EventEmitter in Node.js?
Answer - 58 : -
- EventEmitter is a class that holds all the objects that can emit events
- Whenever an object from the EventEmitter class throws an event, all attached functions are called upon synchronously
Question - 59 : - What are the two types of API functions in Node.js?
Answer - 59 : -
The two types of API functions in Node.js are:
- Asynchronous, non-blocking functions
- Synchronous, blocking functions
Question - 60 : - What is the Express.js package?
Answer - 60 : -
Express is a flexible Node.js web application framework that provides a wide set of features to develop both web and mobile applications