How to Install Node.JS on Ubuntu | Everything You Need to Know

Last updated on 09th Dec 2021, Blog, General

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Node. js is a JavaScript runtime for server-side programming. Node js installed on an Ubuntu 20.04 server: using apt to install the nodejs package from Ubuntu’s default software repository. using apt with an alternate PPA software repository to install specific versions of the nodejs package.

• Introduction of Data Scientist
• How to install node.js on Ubuntu
• Characteristics of node.js
• How can I update my node js to the latest version
• Removing node.js
• Create Node.js Application
• Why node.js is important?
• How does Node.js work behind the scenes?
• Benefits of node.js
• Conclusion

Introduction to node.js

Node.js may be a server-side server engineered into JavaScript Engine for Google Chrome (V8 Engine). Node.js was supported by Ryan Dahl in 2009 and its latest version is v0.10.36. the outline of Node.js as provided in its official documents is as follows –

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Node.js may be a constitutional JavaScript Chrome platform to simply build quicker and additional versatile network applications. Node.js uses an associate degree event-driven, non-blocking I / O model that creates it simple and economical, appropriate for period applications that use information that works on all distributed devices.

Node.js is an associate degree open supply, cross-platform operating setting for server-side development and communication applications. Node.js applications are JavaScript enabled, and may run throughout Node.js time period on OS X, Microsoft Windows, and Linux.

Node.js conjointly provides an upscale library of varied JavaScript modules that facilitate the event of net applications victimisation Node.js extensively.

Node.js = operating Time + JavaScript Library

How to install node.js on Ubuntu:

Node.js could be a JavaScript software engineered into the Chrome V8 JavaScript engine. Node.js is put in in many ways on your Ubuntu UNIX operating system machine. you’ll be able to use the official Ubuntu repository to put in Node.js or differently to use the NodeSource repository. Installation exploitation of the NodeSource repository can enable you to pick the most recent version of Node.js.

Installing a Node in Ubuntu eighteen.04 and 16.04: There square measure 2 options: the official Ubuntu repository and therefore the NodeSouce repository to put in Node.js in Ubuntu.

Install Node.js exploitation the official Ubuntu repository: Node.js is offered within the Ubuntu repository and you’ll be able to simply install it employing a few commands. Follow the steps below to put in Node.js in your Ubuntu application.

• Step 1: Open your terminal or press Ctrl + elevation + T.
• Step 2: to put in node.js apply the subsequent command:
• sudo apt to put in nodejs
• Step 3: Once put in, verify by staring at the put in version exploitation the subsequent
• Command: node -v or node -version

Note: it’s suggested that you simply install Node Package Manager (NPM) with Node.js. NPM is AN open supply library of Node.js packages.

To install NPM, use the subsequent instructions:

sudo apt install npm

npm -v or npm -version

Node and NPM are going to be with success put in on your Ubuntu server

Characteristics of node.js:

The following square measures a number of the key options that create Node.js the primary selection for package developers.

Asynchronous and Event Driven – All Node.js library arthropod genus don’t synchronise, that is, don’t block. It means the Node.js-based server isn’t looking forward to the API to retrieve information. The server goes to the subsequent API once it has completed and also the Node.js Events notification system helps the server get a response to the previous API decision.




Fastest – in-built Google Chrome’s V8 JavaScript Engine, the Node.js library is very quick exploitation code.




Single rib however descendible extremely – Node.js uses one series with a loop event. The event mode allows the server to reply during a non-disruptive method and makes the server a lot larger than regular servers making restricted threads to handle requests. Node.js uses one series system and also the same system will offer services to a bigger variety of applications than regular servers like Apache protocol Server.




No bathtub – Node.js applications don’t bathtub any information. These applications merely extract information by episodes.




Licence – Node.js is issued underneath an associate degree Massachusetts Institute of Technology licence.

How can I update my node js to the latest version:

• Clean STEPS (I use):
• Uninstall previous version of node – sudo apt delete node && sudo apt autoremove.
• Now open the terminal and change the indicator where the node is downloaded and run-
• now apply this to the terminal –
• then insert it with the following –
• use the last source of command ~ / .bashrc.

Removing node.js:

You can transfer Node.js mistreatment apt or nvm, counting on the version you would like to switch. To uninstall the distro-stable version, you may have to work with apt utility at system level.

To remove the distro-stable version, kind the following:

sudo apt to get rid of nodejs- This command can delete the package and save the configuration files. This could be useful if you propose to re-install the package later. If you are doing not wish to save lots of configuration files for later use, use the following:




sudo apt purge nodejs- This will take away the package and take away the configuration files related to it. As a final resort, you’ll delete any unused instant packages with the uninstalled package:




sudo apt autoremove- To uninstall the Node.js version you’ve got enabled mistreatment nvm, initial verify if the version you’d wish to uninstall is that the current active version:




nvm yet- If the version you’re directional isn’t the present version, you’ll start:




nvm uninstall node_version- This command can unharness the chosen version of Node.js. If the version you want to get rid of is that the current version that works, you ought to initial activate nvm to change your changes:




nvm close- You can currently uninstall the present version mistreatment the uninstall command on top of, which can delete all files associated with Node.js’ target version except archive files that may be used for reloading.

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Create Node.js Application:

We will now build a Hello World application that automatically returns “Hello World” to any HTTP requests. This is a sample app that will help you get your Node.js configured, which you can change with your app – just make sure you configure your app to listen to the appropriate IP addresses and ports.

Because we want our Node.js application to provide requests from our hosting server, the web, we will use our application’s private server network to communicate with the servers. Check your server’s private network server address.

If you are using a DigitalOcean droplet as your server, you may be looking at the server’s private IP address through the Metadata service. On the application server, use the curl command to get an IP address now:

• curl -w “\ n” http://169.254.169.254/metadata/v1/interfaces/private/0/ipv4/address
• You will want to copy the output (private IP address), as it will be used to configure our Node.js system.
• Hello World Code
• Next, create and open your Node.js program for editing. In this tutorial, we will use vi to edit a sample application called hello.js:
• cd ~
• vi sawubona.js

Enter the following code in the file, and be sure to change the IP address of the application server for both highlighted APP_PRIVATE_IP_ADDRESS items. If you want, you can also replace the highlighted port, 8080, in both locations (be sure to use a non-control port, i.e. 1024 or higher):

• hello.js
• var http = dinga (‘http’);
• http.createServer (function (req, res) {
• res.writeHead (200, {‘Content Type’: ‘text / plain’});
• res.end (‘Hello World \ n’);
• }). listen (8080, ‘APP_PRIVATE_IP_ADDRESS’);
• console.log (‘Server running on http: // APP_PRIVATE_IP_ADDRESS: 8080 /’);
• Now save and exit.

Why node.js is important?

Node. js is easily used as a proxy server where it can handle a large number of connections at the same time in a secure way. It is very useful to be a representative of different services at different response times, or to collect data at multiple source points. js is a JavaScript platform for standard purpose software that allows users to build network applications quickly. By using JavaScript on both front and back, Node. js makes the development coherent and inclusive. js on the Ubuntu server 18.04.

How does Node.js work behind the scenes?

Node.js may be a JavaScript space supported Google V8 Engine which implies that with the assistance of Node.js we are able to run JavaScript while not a browser. a number of the items you will not have to browse or examine Node.js area unit that it’s one thread, supported the structure of the event-driven structure, and also the blockchain supported the I / O model.

1) Node.js Architecture:

Node.js is battery-powered by the C ++ Crome+ Chrome V8 engine and Libuv, which may be a multi-platform C library that has support for I / O-based events that aren’t compatible with event loops and cable loops. don’t be concerned it’ll be explained during this later article. The vital issue to stay in mind is that, though Node.js is formed by mistreating the V8 and Libuv engine labelled C or C ++, we are still able to use Node.js in pure JavaScript.




2) Node.js application:

Thus currently that we’ve learned regarding the Node.js structure, it’s time to be told however the Node.js system works and this section integrates with the thought that Node.js may be a single and non-single thread. its- to forestall the atmosphere still. So, 1st of all, what’s a thread? A series of straightforward words is essentially a group of redaction directions will|which will|that may} be run severally on a pc methodor and each method we would like to run has its own series to run redaction directions and also the process can have quite one series.




3) Event loop:

so, you would like to recollect without delay that the event loop is the place wherever all of our asynchronous code is employed. For an instant, why not browse the primary paragraph and skim that once more as a result of we are going to be covering the third purpose of Node.js that relies on the development of the event-driven structure. the entire plan behind the event loop is that it applies to the present construction or these 3 steps as shown below: Events area unit excluded, These events will initiate an Associate in Nursing unsupported activity like receiving an hypertext transfer protocol request, the program file module has finished reading the file or the timer has terminated. These events might take issue from our code. After that, the Event-loop picks them up.

Benefits of node.js:

As you explore the execs and cons of Node.js for your next project, of course, it’s vital to grasp however powerful this space is. keep tuned here – Node.js’ list of advantages is long, however a crucial part of understanding your development arrangement. And it’s vital that you simply rent Node.js developers. The United Nations agency perceives a way to take full advantage of these advantages. so as to try and do it right and avoid mistakes, you ought to prepare the Node js interview queries fastidiously.

Ability to grow quickly – every node in Node.js is predicated on associate degree “event.” A client purchases associate degree in-app purchase, or sends associate degree email to client service, as an example. the quantity of nodes you’ll be able to augment your vital system activity is nearly unlimited. this implies you’ll be able to proportion, add new dynamics that bring you back to your core app code. Or, you’ll be able to live horizontally, add new resources to existing programs. In any case, sturdiness permits your application area to grow, which is one of the key advantages of Node.js.




Speed ​​and Performance – Its retiring performance input makes the setting one in every of the quickest choices on the market. The code works quicker, which improves the general performance time. This is often for the most part because of its arrangement. however it conjointly needs to do with the very fact that it works with Google’s V8 JavaScript engine. Its applications are programmed from a distance to the top of Javascript, where plug and play interaction affects speed and performance.




Flexibility – within the discussion of the pliability of Node.js programs is maybe the most important advantage. once you create an amendment to Node.js, solely that node is affected. wherever different operating conditions or structures could need you to form changes till you come to the most program, it needs nothing quite an amendment in location. And that’s smart not just for your initial build, however conjointly for your current renovations. And better of all, if you mix JSON with Node.js, you’ll be able to simply exchange data between shopper servers and an internet server. Editors may use arthropod genus to make communications protocol, HTTP, DNS, etc. server. Development enhancements in most areas and permits editors of all levels easy accessibility to the background of your mobile apps. it’s one of the key advantages of Node.js.




Active cache – within the discussion over the nice and dangerous aspects of Node.js, cache continually seems to be the main advantage of Node.js. it’s nice knowledge storage capabilities. Once requests are created to associate degree applications, they’re kept within the in-app repository. Therefore, once applications revolve around performance and refinement, the nodes will still perform properly and don’t seem to be interrupted by historical knowledge.




Rapid market development – The Node Foundation in JavaScript brings several advantages to the table, particularly simply wherever developers add further options and pre-designed tools and templates. In fact, it’s a comprehensive package management library, with thousands of open supply choices which will be added to your app project instantly. These pre-packaged choices not solely cut back your promoting time, however conjointly cut back your program budget, too. Once you appraise the execs and cons of Node, this is often a comparatively low price.

Conclusion

We have shown you 3 other ways to put in Node.js and npm on your Ubuntu eighteen.04 server. The means you decide on depends on your wants and preferences. Despite the fact that putting in a prepackaged version from the Ubuntu or NodeSource repository is straightforward, the nvm methodology provides you the ability to feature and extract totally different Node.js versions for every user. On your Ubuntu eighteen.04 server, there are many ways to use Node.js. you’ll decide that on top of ways that can fit your wants. a straightforward thanks to use the prepackaged version within the Ubuntu repository by adding flexibility exploitation nvm.