MongoDB database can perform all types of CRUD (Create, Read, Update, Delete) operations. We use a module called mongoose to connect to the MongoDB database.

In the above code, we have connected our project to the MongoDB database. After that we have created a schema, which defines the structure of the data going to be stored. Then we have created a model and exported that to use in the other parts of the application.

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Example :

eventEmitter.on() and eventEmitter.addListener() works in similar way, but the eventEmitter.once() only executes the listener function once, after that it removes the callback function from the listener list.

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React Js is a Javascript library, used to create single page web applications. React uses JSX for writing its components. JSX stands for Javascript XML. In jsx we can write HTML and JS together.

As React Js is a library, so for various features like routing we have to install separate packages.

Angular Js :

Angular Js is a Javascript framework, which can also be used to make single page web applications. Angular is Js framework, which means it has more inbuilt features. Angular also uses the component based approach to create websites.

Difference between React Js and Angular :

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1. A code repository, where all the code is hosted.
2. A command line interface, for downloading the libraries from the online repository.

Installing packages using NPM

What is package.json file?

package.json file is created when we run the npm init command. This file contains all the details of our project like name, version, author, dependencies, description, scripts, license etc.

It is the file which is used by NPM to download the node modules required by your project with the proper version.

What is package-lock.json file?

The contents of the package.json file can be changed, for example if we have updated our packages, then the package.json will contain the latest updates. But the package-lock.json file contains the exact dependencies.

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Node Js has a module called url, it is used for handling and manipulating the urls. It is a inbuilt module. We can use this to get the query string, construct a url from an object.

Using the URL Module

Accessing the different parts of the url

Constructing a url from an object

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To use it in our projects, we first have to import it.

Creating a server

Using HTTP module we can create a server and make that server listen on the specified port. We can do this using the createServer() method of the HTTP module.

Rendering HTML using HTTP module

Reading the url and sending the Header field

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Modules in Node Js are similar to the libraries in JS. Modules help to breakdown the complex logic into a collection of simple ones.

Types of Modules

Core/Inbuilt Modules : We don’t have to download these modules, they are installed along with the Node Js installation. We can use core modules by just importing them in our code. Some examples of the core modules are http, fs, os, path etc.

Third Party Modules : These modules are not included with the Node Js. We have to download them in our project. Most of the packages we use are available on npm. NPM stands for Node Package Manager, npm is a code repository, where you can find almost all types of modules.

Local Modules : Local modules are created by ourselves according to the need and can be used at the place where it is required.

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Node Js is used to create data-intensive web applications or APIs as it uses the asynchronous methodology.

Why should we use Node JS?

1. First of all, Node Js is based on JS, so you will definitely use JS for the frontend of your web applications. Using Node Js on the backend will help you to use the same JS on the backend as well (with some changes), so you don’t have to learn a different language for the backend.
2. Node JS can easily handle the basic CRUD (Create Read Update Delete) operations on the web apps.
3. We can send back dynamic content to the client and can also handle form submissions.
4. Node Js supports all the HTTP methods like get, post, put, patch, delete and the list goes on.
5. Using Node Js, you can also implement the authentication and authorization on your web apps.
6. As Node Js is based on asynchronous methodology, its asynchronous nature eventually results in the better performance.
7. You can connect Node Js to various databases like MySql, MongoDB etc.

Creating a basic server using Node JS

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https://nodejs.org/en/download/

When Install please open your command prompt window
Short way
Window + r
Its comes up with this Run Box and put cmd in the box

After click OK it will open the command prompt and run below command

node -v

This command shows node Js running version.
If this not come and show error node is not an external or internal command
Please follow the below steps
1. Right click on My Computer / This PC and select properties below screen will come

Click on Advance system settings and after that below screen comes

Click on Environment Variables and below screen come

Double click on path in system variables or select path and click Edit button. Below screen will come.

Please check nodejs is there or not If not then click on New button and add the nodejs folder path and click Ok and then again open the command Prompt and run the node command mention above.

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Create a file name app.js and paste below code like below screenshot

var http = require('http');

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello Maxester!');
}).listen(8000);

After this run below command
node app

screenshot below

After run above command open you browser and run the below URL

http://localhost:8000/

Output come like this

If this comes then your node js sample code working fine on your system.
If you still face issue please cross check with the installation of Node Js on your system.

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