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    Q1. What’s the MEAN Stack?

    The MEAN stack is a set of JavaScript-based web development tools. MongoDB, ExpressJS, AngularJS, and Node.js are referred to together as MEAN. MEAN is full-stack JavaScript, from client to server to database.

    Q2.What is Express?

    In the Node.js development world, Express is one of the most popular and widely used web platforms. Express is a lightweight web server built on Node.js that provides all of the essential features for delivering web applications to desktops and mobile devices. ExpressJS makes it simple to deal with Routes, Servers, and I/O operations.

    Q3. Why is consistent style important and what tools can be used to assure it?

    A consistent style allows team members to quickly change projects without having to learn a new style each time. Standard and ESLint are two useful tools.

    Q4. What is the difference between AngularJS and Node.js?

    Node.js is a runtime system, while Angular.JS is a web application development framework.

    Q5. Explain REPL In Node.Js?

    The REPL (Read Eval Print Loop) is an acronym for “Read Eval Print Loop.” It’s a straightforward programme that takes in commands, evaluates them, and then prints the results. REPL offers an environment that is analogous to a Unix/Linux shell or a window console, in which we can input a command and the system will react with the result. REPL is responsible for the following duties.


    It takes the user’s input, parses it into a JavaScript data structure, and saves it in memory.


    It is responsible for executing the data structure.


    This command prints the result of evaluating the command.


    This command is repeated until the user presses Ctrl+C twice.

    Q6. What Is The Difference Between Nodejs, AJAX, And JQuery?

    The only thing that Node.js, AJAX, and jQuery have in common is that they’re all sophisticated JavaScript implementations. They do, however, serve very distinct functions.

    Node.Js is a server-side framework for building client-server applications. If we’re creating an online personnel management system, for example, we won’t use client-side JS. Node.js, on the other hand, can absolutely accomplish it because it runs on a server comparable to Apache, rather than in a browser like Django.

    AJAX (Asynchronous Javascript And XML) is a client-side scripting method used to render the contents of a page without having to refresh it. AJAX is used by a number of big organisations, like Facebook and Stack Overflow, to show dynamic information.

    JQuery is a well-known JavaScript module that supports AJAX, DOM traversal, looping, and other features. This library contains a number of helpful utilities for JavaScript programming. It is not required to utilise it, but because it maintains cross-browser compatibility, it can assist you in creating highly maintainable online applications.

    Q7.What is the purpose of an index server in MongoDB?

    Lists are used in MongoDB to aid and promote the effective execution of questions. Without files, MongoDB must do an assortment filter, in which it must examine each report in a collection and choose the appropriate archives to coordinate the inquiry explanation. However, if each query has a corresponding file assigned to it, MongoDB may use the list to limit the amount of reports it needs to review.

    Q8.Differentiate the interfaces and classes in typescript?

    In TypeScript, classes and interfaces are structures that help with both article-based programming and type-checking. An interface gathers linked characteristics and methods that depict an item, whereas a class is an outline from which you may gather components with a comparable arrangement (properties and strategies). An interface, on the other hand, does not provide usage or introduction to objects.

    In most cases, a class describes how an article should look and behave. It also creates and runs a diagram by specifying class attributes and demonstrating techniques.

    Q9.Tell me about Containerization?

    Containerization, as opposed to traditional hypervisor-based machine virtualization, encapsulates the essence of a programme into a compartment within its working environment. Rather than duplicating an operational framework for individual virtual machines, containerization makes it available to all containers. You can execute an application on any genuine suitable device without worrying about circumstances if you stack it in a virtual machine.

    Q10.xplain about NPM of node.Js?

    NPM stands for Node Package Manager in its complete form. It has anything to do with the two main capabilities listed below:

    1. It’s usually used to introduce bundles as an order line utility. It also appoints CEOs and relies on the board of directors of other Node.Js packages.
    2. Because of Node.Js packages, it also serves as an online archive. These are also contained in the Node.Js.organization record.

    Aside from the questions listed above, remember that Node.Js engineering is built on a multi-center base. You should also think about the callback supervisor so that you can control the meeting.

    Q11.What does Express.js do in the MEAN stack?

    Express.js makes it easier to develop online applications by providing a simpler interface for creating request endpoints, handling goodies, and so on than vanilla Node. You could remove it from the condition, but that would need a lot more work in terms of web-application preparation. The Node can do anything except express, which is implemented by the Node. Express, on the other hand, simply wraps it in a more appealing package.

    Q12.What is Routing Guard in Angular?

    Route guards in Angular are interfaces that may inform a router whether or not to allow navigation to a certain route. They arrive at this conclusion by checking for a true or false return result from a class that implements the guard interface in question.

    Q13.What Is The Difference Between Node.js, Ajax, And Jquery?

    The only thing that Node.js, AJAX, and jQuery have in common is that they’re all sophisticated JavaScript implementations. They do, however, serve very distinct functions.

    Q14. Explain Routing In Express.js?

    The way an application’s endpoints (URIs) react to client requests is referred to as routing. Routing is defined using Express app object methods that correspond to HTTP methods, such as app.get() for GET requests and app.post() for POST requests.

    The following is some basic Express code for routing:

    var express = require(‘sample’)

    var app = sample()

    respond with “this is test” when a GET request is made to the homepage

    app.get(‘/’, function (req, res) {

    res.send(‘this is test’)


    Q15.What Does Event-driven Programming Mean?

    Occasion driven creating computer programmes is a programming paradigm in which the program’s flow is governed by events such as messages from various projects or strings. It is a way of application engineering that is divided into two parts.

    Q16.Explain session and cookie in your code?

    Information is stored via cookies and sessions. Cookies are only saved on the client machine, whereas sessions are saved on both the client and the server. A session saves registered session variables and their values in a file in the server’s temporary directory.

    Q17.What do you understand by services with reference to angular js?

    In angular js, services are used to organise and distribute code throughout your project. These are the appropriate items that are connected together via dependency injection. The angular js services are created slowly. Angular js only creates the service when it is required by an application component. New services may be created with angular js, and they can even be utilised in other built-in services. In angular js, there are over 30 built-in services.

    Q18.Why we use mean stack?

    Node.js makes it simple to create web apps since it has a large library of JavaScript modules to choose from. Mean stack allows developers to create code in just one language, JavaScript, for both the client and server sides, making it a simple and quick language.

    Q19.What type of NoSQLdatebase is MongoDb?

    A document database is MongoDB. Information regarding networks, such as social relationships, is stored in graph databases. Neo4J and HyperGraphDB are two examples. As organisations use NoSQL databases to an increasing range of use cases, they are becoming more popular.

    Q20.What is a service, and when will you use it?

    Angular services are singleton objects that are created just once during an application’s lifetime. They include methods for preserving data over the life of an application, i.e., data is not updated and is always available. The primary goal of a service is to structure and exchange business logic, models, data, and functions among many Angular components.

    Q21.Features of MEANStack
    • It’s built to handle massive volumes of data with a high level of scalability and flexibility.
    • MEAN creates cloud-ready apps that are flexible and adaptable.
    • With a built-in server, deployment is quick and easy.
    • The entire application is written in a single language.
    Q22.What’s a test pyramid? By what method may you complete it while talking about HTTP APIs?

    When it comes to working test cases, a test pyramid shows that there should be far more low-level unit tests than unusual state end-to-end tests.

    It may come down to this when discussing HTTP APIs:

    For your models, there are a number of low-level unit tests.

    Less joining tests, in which you examine how your models interact with one another; essentially, less affirmation tests, in which you examine the certifiable HTTP endpoints.

    Q23.How to Update Node (Windows/macOS) Using Installers on Nodejs.org?

    Binary packages for Windows and macOS are available on the Node.js downloads page, but why complicate your life? The pre-made installers —.msi for Windows and.pkg for macOS — make the installation procedure incredibly simple and straightforward. Download and execute the file, then leave the rest to the installation wizard. The newer versions of Node and npm will replace the older versions with each downloaded update.

    Q24.What are the timing features of Node.js?

    The Node.js Timers module contains methods that run code when a certain amount of time has passed.

    setTimeout/clearTimeout –

    These functions can be used to schedule code execution after a certain number of milliseconds.


    It can be used to repeatedly run a section of code.

    setImmediate/clearImmediate –

    This command will run code at the conclusion of the current event loop cycle.

    process.nextTick is used to schedule a callback function to be executed in the Event Loop’s next iteration.


    console.log(‘THIS IS SAMPLE PROCESSING’);



    console.log(‘THIS IS SAMPLE ITERATION’);




    Q25.What is Scope in JavaScript?

    Each function in JavaScript has its own scope. Scope is essentially a set of variables as well as the rules for accessing those variables by name. The scoped variables of that function can only be accessed by code inside that function.

    Within the same scope, a variable name must be unique. It’s possible to nest one scope inside another. When one scope is nested inside another, the deepest scope’s code can access variables from both scopes.

    Q26.What is a service, and when will you use it?

    When it comes to working test cases, a test pyramid shows that there should be far more low-level unit tests than unusual state end-to-end tests.

    It may come down to this when discussing HTTP APIs:

    For your models, there are a number of low-level unit tests.

    Less joining tests, in which you examine how your models interact with one another; essentially, less affirmation tests, in which you examine the certifiable HTTP endpoints.

    Q27.What is Dependency Injection?

    Dependency injection makes it simple to construct loosely linked components, which implies that components consume interface-defined functionality without knowing which implementation classes are being utilised firsthand.

    Q28.What is Inversion of Control?

    Inversion of control is a wide phrase, but it’s most frequently characterised as a method for decoupling components and levels in a system by a software developer.

    Q29.How does the Centralized Workflow work?

    The Centralized Workflow makes use of a central repository as the single point of entry for all project updates. All modifications are committed to the master branch, which is the default development branch.

    Q30.What is BSON in MongoDB?

    In MongoDB, BSON is a binary serialisation standard for storing documents and making remote procedure calls. BSON is a JSON extension that adds more data types, ordered fields, and makes encoding and decoding in multiple languages more efficient.

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