Introduction to Node.js | NodeJS Tutorial for Beginners | Node.js Training | Edureka Rewind

Key Takeaways

so good morning good afternoon and good evening guys based on the time zones you all are coming from so guys before we start with the session can you all please give me a quick information if you all can see my screen and hear me loud and clear as well perfect thank you so much for the confirmation everyone so my name is n Kia and I have been working in this IT industry for more than 133 years now let me quickly introduce um edica masterclass Community with you all as well so this community of master classes we started back in 2019 and since then we have been closing into more than 31,000 members so far and in these master classes we conduct multiple webinars on different topics including blockchain iot artificial intelligence machine learning and multiple frontend and backend development Technologies and the best part about these webinars are they are absolutely free of cost so they are no charges involved here and these are a really great platform for anyone who is looking to get into the industry vertical by learning the technology that is required so the main agenda for today's session we have gathered for a discussion on nodejs what exactly nodejs is and here we are going to discuss on how nodejs is useful so basically we are going to start with a discussion on noj what exactly it is the nodejs architecture then we are going to discuss on the concepts of nodejs module the npm as node package manager the Json files the nodejs basics the file system events the HB module and a small handson in the time allows first of all if we talk about noj and noj for example if you have heard about noj then we know that it is one of the most prominent and Powerful Frameworks of JavaScript so since it's released it has continued to keep its Str string hold on the it market so if you talk about what exactly nodejs and nodejs is a powerful framework developed on developed on Chrome's V8 JavaScript engine that compiles JavaScript directly into the native machine code and it is a lightweight framework used for creating a server side web application and extends the JavaScript API to offer usual server side functionalities and it is generally used for large scale application development especially for video streaming s single page applications and other web applications nodejs makes use of an event driven non-blocking IO model which makes it right pick for data intensive realtime applications so like any other programming language nodejs makes use of the packages and modules and they are libraries that contain various functions that are imported from npm as a node package manager into a code and utilized in the programs some of the major features that def find NOS are get include the being open source so we know that nodejs is what nodejs is basically an open source framework so if we have a list on the features then the first thing is it is an open source that means it is an open source framework MIT license that is supported by a huge Community its Community is pretty much active and have contributed to to add new capabilities to nodejs applications and then it is simple and fast now since nodejs is built on Google's Chrome VA JavaScript engine its libraries are capable of fast execution and it is a synchronous that means all the libraries of nodejs are asynchronous which means that nodejs P servers will never wait for an API to send back the response and move on to the next API and then it is highly scalable because of the event mechanism no Js is highly scalable and it simply AIDS a server in a non-blocking response it is single threaded that means with the help of event looping OJs is able to follow the single threaded model and this lets a single program to handle multiple request and then we have no buffering so one of the major functionalities of nodejs is to a is to be able to follow the single threaded model and this lets a single program to handle multiple requests and that to with most amount of flexibility and then it supports a crossplatform that means noes can easily build and deployed on various platforms like Windows Mac OS and Linux so there is no platform dependency so let's now Advance further and see how to deploy the actual code on the browser but before that we need to know okay how we can download and install this in our system so first of all we are going to also talk about the node package management we refer as node npm and before that let's have a short discussion on the node js architecture as well what exactly it is so here we have the npm so we were talking about the npm node package manager so npm as we know is basically the main package manager available by node through which we can install multiple modules available under the node environment and from version 6.0 onwards npm has been added as a default in the node installation and it save us from the hassle of installing npm explicitly so npm basically helps in two ways it provides the host online reposes for nodejs packages which can be easily downloaded and used in our project without doing them manually and providing the command line utility in order to install various nodejs packages like we have the multiple packages available for reat for angular so again they all are already available under npm as a note pack package manager so now we must be wondering what exactly these modules are and how do they help us in building the nodejs application so first of all we can go ahead and discuss on the main core components of nodejs so first of all we have nodejs modules so the modules in nodejs represents various functionalities that are bundled up into a single or multiple JS files so these modules have a unique context th they never inter Fair nor pollute the scope of other modules so these modules enable the code reusability and enhances the you the ease of usage so nodejs basically provides three type of modules code modules local modules and thirdparty modules and now the as you discuss these are main types in terms of code module again we know that nodejs is basically a lightweight framework so the code module bundles the absolute minimum functionalities and and these models generally get loaded when the node process starts its execution and all we need to know can do is to Simply import these code modules in order to use them into a code and then we have the local variables so we can say local modules so the local modules of nodejs are custom modules that are created locally by user developer in the application now these modules can include various functionalities bundled into distinct files and folders which can be easily distributed in the nodejs community using npm now these modules are loaded in a similar way to code modules so we can Define okay how exactly we have to create the custom modules within the application and these are going to be included and then we have the external modules so basically we can use third party or external modules by downloading them via npm for example the all the modules for rat as in create re the react module in terms of the react components in terms of Rea Redux and the express Services again these are all different packages available by default and these modules are generally developed by developers which are again they are free to use and few of the best external modules are riat sculp mongus mocha and Etc so next before we move on so next we have as we discussed so these are the different core modules including h HTP URL QD string FS path and the util then we have the local modules and then we have services for third party modules like we have the in payment install we have the save modules which are explicitly used in node as we have discussed next we have Json file so the package.json file in nodejs is the heart of the entire application it basically manifest file it is basically the Manifest file which contains the metata of the project and this understanding and working with this file becomes very important to a successful node project development and the package.json file generally consist of metadata for the application which is further categorized into two different categories like we have identifying the metata properties and then writing directly to the file as well so if you talk about identifying the metadata two properties that this consists of properties like the project name current module version license or author of the project Etc whereas if you talk about writing directly to file then we can directly write the necessary information into the package.json file and include it in our project right so now we are familiar with the various components of nodejs function so now we are going to look at how we can go ahead and get started and here we can see a a small description about the on file first of all we have to define the version then we have to Define description which is basically description and purpose of the application for example this is going to be a re application for the management of the bank record so again this is where the the description should go and then we have Define meain so basic basically this is going to be the entry point of the application so this is where we are going to start the application and then we have to Define what we have to define the script which is required and then we we have def find the version of node and the npm to use then the primary author is specified here we Define the licensing and then we Define the dependencies as in third party package or modules installed by npm and then it goes down to the development depencies that are that are used only in the development part of the application and then we have the bug URL so the URL and email with the bug of the application should be reported as here so these are the basics for the file and then we have nodejs Basics now since nodejs is a JavaScript framework so it uses JavaScript functions against a syntaxes so if you want to learn JavaScript if we are having a Clarity or can say Comfort level welcom JavaScript then we are good to go because again in terms of the primitive data types available we have string number Boolean null undefined and in terms of non-primitive we have we have object date and array so these are the main types of data available under node and they all have different use cases for example if you talk about variables so variables are simply the entities that hold values which may vary during the course of a program and to make a variable in no choice we can simply do that by using a reserve keyword decare as far and we don't have to assign our data type as a comp comper itself is going to pick it up and then it is going to assign it to us then we have after variables we have all the operators that we can use for performing actions we can choose any kind of application so basically in the operators part we have arithmetic operators we have assignment operators conditional comparison logical and bitwise so arithmetic includes the addition substraction division multiplication modulus increment or decrement in terms of assignment VC equals to plus equals to minus equals to multiply equals to or divide equals to and then we can Define any condition as in what kind of data we want comparison for making comparison between two different statements whether Al alphabetically or numerically and then we have logical where we have and or and nextor and then we have bitf which is basically and and then we have multiple s in terms of the multiple Place shifters so these are are available types available so so next we have functions so functions in node is basically a block of code that has a name and is written to achieve a particular task so we need to use a keyword function to create it and a function is generally a two-step process first it defines a function and second was is going to invoke it especially in terms of adding the interactivity if you want that on click of a button something should be deployed then we can deploy it all right so this is what we have to Define and next is we can first of all let me just guide you how we can download and install noes into our environment so here we can go ahead and type in as nodejs download and this is going to download nodejs in our system and then based on the platform whichever we are running we can choose the right platform and then this is going to get downloaded accordingly So based on the platform whether we are running on Mac OS on Windows or Linux envirment we can go ahead and and download the package and once we download the package we have to install it just like our regular software and just to cross check that it has been properly install or not we can use a command prompt so here under the command prompt we have to type in node and then space and then version if node has been properly installed we would be able to see the version of node return to us as 1 12.1 18.2 so once we are able to see the version of node then we can go ahead and set up the entire noj application for us to get started with so once we are done then we can go ahead and create a one folder as well in which you want to work so let's say here we can Define the folder name as suppose node app so we already have a folder by the name of node app just Let's cross check if we do have anything already available in node app so here under the users folder we have node app all right so here we already have a default Locker file and package ofon already created so for working on this node app we can do one thing we can simply erase these files for now we can delete them and then we can go ahead and initialize a new blocker here but again a new ense of the noes application so that we can get started so once we have configured this then we are going to start our deployment process so first of all to initialize node in this folder here we can simply type in command as npm and in it so in it stands for initialize so this is going to initialize an empty mpm package manager within this particular folder so here we have to define the package name it can be any package name for example let's say here we want to call it as node app itself node app as node app and then we can Define the version as one and the description for it then we are going to find the entry point is going to be index.js file if you want to change it we then we can Define that the test command is what we can want to keep it as none in terms if we want to link this up with any of the depository where we may have the code coming in from different sources then that is what we can Define under kosty and then again we can Define the keywords that you want to use for this one the author of the application the licensing part and then this is what is going to be generated if we are okay with it then we can simply make any details or we can request for any number of changes if required and once we add done we can clear the screen as well so if you go back in the folder we would be able to see a simple package.json file has been defined and again this is going to be the default package.json file that we are going to work with and then we can use any other web Frameworks for example we can also go ahead and install angular we can go ahead and install noes and then we can deploy the application on top of it accordingly and we can also go ahead and install multiple other libraries or we can say the Frameworks as for example we want to install angular then we can use the command as angular as the angular sealer and then angular is going to be installed and configured if you're looking for react then again we have command installation of react as well for example we want to use react so here first of all to install any of the packages we can type in npm which stands for node package manager and then we can Define the name of the package suppose we want to install let's say create riat which simply go ahead and deploys the riat application rat Library we simply downloads and configures reat library and then based on that the r application is going to be triggered here for example let's say we want to install this Library we can run this command here so there are two two different libraries available here either we can run this by using the npm or we can run this by using The NPS as well and this is going to download the entire package and then it is going to install it and let's say once we are done then we can run the statement as inpx from same node package console and then here we can Define create re app and whatever name we want to give so basically here we don't have to do anything manually we have we had a fine okay we simply missed the name so here we are going to use npx create react app and we Define the name suppose as react app one so this is going to be the name of the package for example we want to configure Rea app one then by this name the r application is going to be deployed which is going to be automatically fledged from npx ESS so this re reor re STP again these are all libraries available under noes and then we can get started same thing we do with the other components so we may wait for a couple of minutes for this one to be configured properly and see if we want to configure let's say angular with node on top of node we want to configure Rea on top of no then we can do that so as you can see once the package has been config good so we can simply switch to the package for example here we can switch to the folder in which we had in which we had deployed the reat library that we have configured by using node and here we can type in as npm and then start so node package no node service is going to start by using the library that we have configured from react and again react as know will be running on top of nodejs framework as a part of setup so this is going to trigger the server which is going to be open up in the browser and as you can see since we have configured the package so now this entire rat library is currently running on top of nodejs now remember reat is not a framework it's a library and we can also integrate re with some other libraries as well like we have angulus or we have bootstraps so we can integrate that with these Frameworks to deploy a completely web faced application thank you so much for joining guys and have a great day H take care bye-bye