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Author: saqibkhan

  • What is the command used to import external libraries?

    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.

    varhttp

  • What are some of the most commonly used libraries in Node.js?

    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.

  • Which database is more popularly used with Node.js?

    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.

  • What is the difference between Angular and Node.js?

    AngularNode.js
    It is a frontend development frameworkIt is a server-side environment
    It is written in TypeScriptIt is written in C, C++ languages
    Used for building single-page, client-side web applicationsUsed for building fast and scalable server-side networking applications
    Splits a web application into MVC componentsGenerates database queries

  • Why is Node.js preferred over other backend technologies like Java and PHP?

    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

  • What is the purpose of the module .Exports?

    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.

  • What are the modules in Node.js?

    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 ModulesDescription
    HTTPIncludes classes, methods, and events to create a Node.js HTTP server 
    utilIncludes utility functions useful for developers
    fsIncludes events, classes, and methods to deal with file I/O operations
    urlIncludes methods for URL parsing
    query stringIncludes methods to work with query string
    streamIncludes methods to handle streaming data
    zlibIncludes methods to compress or decompress files

  • What is NPM?

    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  

  • How is Node.js most frequently used?

    Node.js is widely used in the following applications:

    1. Real-time chats
    2. Internet of Things
    3. Complex SPAs (Single-Page Applications)
    4. Real-time collaboration tools
    5. Streaming applications
    6. Microservices architecture

  • Explain the difference between frontend and backend development?

    Front-endBack-end
    Frontend refers to the client-side of an applicationBackend refers to the server-side of an application
    It is the part of a web application that users can see and interact withIt constitutes everything that happens behind the scenes
    It typically includes everything that attributes to the visual aspects of a web applicationIt generally includes a web server that communicates with a database to serve requests
    HTML, CSS, JavaScript, AngularJS, and ReactJS are some of the essentials of frontend developmentJava, PHP, Python, and Node.js are some of the backend development technologies