Introduction to NodeJS | NodeJS Components

Learning Introduction to NodeJS | NodeJS Components

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  1. What is Node JS ?
  2. What is NPM ?
  3. What are the core modules of Node JS ?

1)-Node.js is an open-source and cross-platform JavaScript runtime environment. A Node.js app runs in a single process, without creating a new thread for every request. Node.js provides a set of asynchronous I/O primitives in its standard library.

2)-npm is the standard package manager for Node.js.
-npm manages downloads of dependencies of your project.

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What is http module?
What is Http ?
What is Request and Response ?
What is Express Js ?
What is Nodemon ?

    1. What are the core modules of Node JS ?

A: Core Modules of Node JS are
-File System (fs)
-Operating System (Os)

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  1. what is node js ?
    answer : node-js is an open source, cross platform runtime platform allows developers to run
    JavaScript code outside of web browser.
    it id build an VB JavaScript engine which is the same engine that powers to same
    chrome browser.
  2. what is NPM?
    answer: NPM stands for node package manager its package manager for javascript
    programing language.
    NPM allows developers to easily manage and share libraries, packages, and
    dependencies for their JavaScript projects.
  3. what are the core modules of node Js?
    answer : Node.js comes with a set of built-in modules, often referred to as core modules or
    global modules.
    a. fs (File System)
    b. http and https
    c. url
    d. path
    e. os (Operating System)
    f. events
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  1. what is the http module?
    answer : The http module is one of the core modules in Node.js
    It provides the necessary functionality to create web servers and make HTTP
    This module enables you to handle incoming HTTP requests and send back
    appropriate HTTP responses.

  2. what is http?
    answer: HTTP, which stands for Hypertext Transfer Protocol, is a fundamental protocol used
    for communication on the World Wide Web.

    key features : Stateless , Client-Server Architecture , Request-Response Model ,
    Text-Based Protocol , Connectionless , State Management , Security.

  3. what is request and response?
    answer: in the context of web commutating using http request and response two
    fundamental components that facilitate the exchange of data to client and server.

    A. Request: A request is made by a client to a server in order to retrieve or send
    It includes information about what the client is asking for, and how the
    server should process the request.

    B. Response: A response is sent by the server in reply to a client’s request.

    It contains information about the status of the request and, optionally,
    the data requested by the client.

  4. what is express js?
    answer: a. Express.js, often referred to simply as Express, is a minimal and flexible web
    application framework for Node.js.
    b. It provides a robust set of features for building web and mobile applications.
    c. Express is designed to make it easier to write web applications and APIs by
    providing a simple and intuitive interface for handling HTTP requests and

5.what is nodemon?
answer: a. nodemon is a utility for Node.js that monitors for changes in files in a Node.js
application and automatically restarts the server when changes are detected.
b. It’s particularly useful during development because it saves developers from
manually stopping and restarting the server every time they make changes to their

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Q1) what is http module?

Ans:- Node.js has a built-in module called HTTP, which allows Node.js to transfer data over the Hyper Text Transfer Protocol (HTTP).

To include the HTTP module, use the require() method:

var http = require(‘http’);

Q.2) What is HTTP?
Ans:-Http is a protocol which is used for request and response

Q.3)What is Request and Response ?

Ans:- Both req and res are made available to us by the Express framework. The req object represents the HTTP request and has properties for the request query string, parameters, body, and HTTP headers. The res object represents the HTTP response that an Express app sends when it gets an HTTP request

Q.4) what is express js
Ans:- ExpressJS is a web framework that enables you to design a web application to handle a variety of different HTTP demands
Q.5) what is express Js
Ans:-Express is a fast, assertive, essential and moderate web framework of Node.js
Q.6) What is nodemon?
Ans:-nodeman is package which is no need to restart the servere again and again while changing in code

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  1. what is node js

Ans:- Node. js (Node) is an open source, cross-platform runtime environment for executing JavaScript code. Node is used extensively for server-side programming, making it possible for developers to use JavaScript for client-side and server-side code without needing to learn an additional language.

    1. What is NPM ?

Ans:- npm stands for Node Package Manager. It is a library and registry for JavaScript. npm also has command-line tools to help you install the different packages and manage their dependencies

  1. What are the core modules of Node JS ?

1)file system

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Everyone nice nice :heart:

  1. Node.js:
  • Node.js is an open-source, server-side runtime environment built on Chrome’s V8 JavaScript engine. It allows you to run JavaScript code on the server side, enabling you to build fast, scalable network applications. This is in contrast to traditional JavaScript which is typically run in web browsers.
  • Node.js is event-driven, meaning it can handle multiple connections concurrently without creating a new thread for each one. This makes it particularly well-suited for building real-time applications like chat applications or online games.
  • It’s widely used for building web applications, APIs, microservices, and other networked software.
  1. NPM (Node Package Manager):
  • NPM is a package manager for JavaScript and the world’s largest software registry. It consists of a command-line client and an online database of public and paid-for private packages.
  • NPM is used to install, share, and manage packages or libraries of JavaScript code that you can use in your projects. It also handles dependencies, making it easier to manage complex projects.
  • It comes pre-installed with Node.js, so when you install Node, you also get NPM.
  1. Core Modules of Node.js:
  • Node.js has a set of core modules that provide essential functionality for building applications. Some of the core modules include:
    • fs (File System): Provides methods for interacting with the file system, allowing you to read and write files.
    • http: Allows you to create an HTTP server and make HTTP requests.
    • url: Provides utilities for URL resolution and parsing.
    • path: Helps with working with file and directory paths.
    • os: Provides information about the operating system.
    • events: Allows you to work with events and event-driven programming.
    • util: Contains various utility functions that can be useful for working with JavaScript.
    • buffer: Provides a way to work with binary data directly.
    • stream: Provides an abstract interface for working with streaming data.

These are just a few examples of the core modules in Node.js. There are many more, each providing specific functionality that can be utilized in your applications.

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  1. HTTP Module:
  • The http module in Node.js allows you to create an HTTP server and make HTTP requests. It provides classes and functions that enable you to interact with the HTTP protocol.
  • With the http module, you can create a server that listens for client requests, handle those requests, and send responses back to the client.
  1. HTTP (Hypertext Transfer Protocol):
  • HTTP is a protocol that allows the fetching of resources, such as HTML documents, images, and scripts, from web servers. It’s the foundation for data communication on the World Wide Web.
  • When you type a URL into your web browser, your browser sends an HTTP request to the server hosting the website, and the server responds with the requested content.
  1. Request and Response:
  • In the context of web servers and clients:
    • Request: It is a message sent by the client (usually a web browser) to request a specific resource from the server. This could be a webpage, an image, a file, etc.
    • Response: It is the message sent by the server in reply to the client’s request. It contains the requested resource or an error message.
  1. Express.js:
  • Express.js is a popular, fast, and minimalist web framework for Node.js. It simplifies the process of building web applications and APIs by providing a set of robust features and middleware.
  • Express allows you to define routes, handle HTTP requests and responses, and manage application state. It’s widely used for building web applications, APIs, and backends.
  1. Nodemon:
  • Nodemon is a utility that monitors for changes in files in a Node.js application and automatically restarts the server when changes are detected.
  • This is incredibly useful during development, as it saves you the hassle of manually stopping and restarting your server every time you make a code change.
  • It’s often used to streamline the development process and make it more efficient.
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@harshitrajlnctcse : i am getting this type of error sir please suggest me solution for this

MongoServerError: db already exists with different case already have: [Test] trying to create [test]
at C:\Users\Abhishek Kumar\Desktop\node practice\Food-Delivery-Backend\node_modules\mongodb\lib\operations\insert.js:50:33
at C:\Users\Abhishek Kumar\Desktop\node practice\Food-Delivery-Backend\node_modules\mongodb\lib\operations\command.js:84:64
at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
index: 0,
code: 13297,
[Symbol(errorLabels)]: Set(0) {}