Question-11. What is NPM?
Answer- 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-12. What are the modules in Node.js?
Answer- Modules are like JavaScript libraries that can be used in a Node.js application to include a set of functions. To include a module in a Node.js application, use the require() function with the parentheses containing the module’s name.
Node.js has many modules to provide the basic functionality needed for a web application. Some of them include:
| Core Modules | Description |
| HTTP | Includes classes, methods, and events to create a Node.js HTTP server |
| util | Includes utility functions useful for developers |
| fs | Includes events, classes, and methods to deal with file I/O operations |
| url | Includes methods for URL parsing |
| query string | Includes methods to work with query string |
| stream | Includes methods to handle streaming data |
| zlib | Includes methods to compress or decompress files |
Question-13. What is the purpose of the module .Exports?
Answer- 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-14. Why is Node.js preferred over other backend technologies like Java and PHP?
Answer- 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-15. What is the difference between Angular and Node.js?
| Angular | Node.js |
| It is a frontend development framework | It is a server-side environment |
| It is written in TypeScript | It is written in C, C++ languages |
| Used for building single-page, client-side web applications | Used for building fast and scalable server-side networking applications |
| Splits a web application into MVC components | Generates database queries |
Question-16. Which database is more popularly used with Node.js?
Answer- 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-17. What are some of the most commonly used libraries in Node.js?
Answer- 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-18. What are the pros and cons of Node.js?
| Node.js Pros | Node.js Cons |
| Fast processing and an event-based model | Not suitable for heavy computational tasks |
| Uses JavaScript, which is well-known amongst developers | Using callback is complex since you end up with several nested callbacks |
| Node Package Manager has over 50,000 packages that provide the functionality to an application | Dealing with relational databases is not a good option for Node.js |
| Best suited for streaming huge amounts of data and I/O intensive operations | Since Node.js is single-threaded, CPU intensive tasks are not its strong suit |
Question-19. What is the command used to import external libraries?
Answer- The “require” command is used for importing external libraries. For example – “var http=require (“HTTP”).” This will load the HTTP library and the single exported object through the HTTP variable.
Now that we have covered some of the important beginner-level Node.js interview questions let us look at some of the intermediate-level Node.js interview questions.
Question-20. What does event-driven programming mean?
Answer- 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.