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Levi Rivera
Levi Rivera

Node Js Tutorial


This tutorial is designed for software programmers who want to learn the basics of Node.js and its architectural concepts. This tutorial will give you enough understanding on all the necessary components of Node.js with suitable examples.




Node js tutorial



Before proceeding with this tutorial, you should have a basic understanding of JavaScript. As we are going to develop web-based applications using Node.js, it will be good if you have some understanding of other web technologies such as HTML, CSS, AJAX, etc.


To get started in this walkthrough, install Node.js for your platform. The Node Package Manager is included in the Node.js distribution. You'll need to open a new terminal (command prompt) for the node and npm command-line tools to be on your PATH.


Windows Subsystem for Linux: If you are on Windows, WSL is a great way to do Node.js development. You can run Linux distributions on Windows and install Node.js into the Linux environment. When coupled with the WSL extension, you get full VS Code editing and debugging support while running in the context of WSL. To learn more, go to Developing in WSL or try the Working in WSL tutorial.


At this point, we should test that our application runs. The generated Express application has a package.json file which includes a start script to run node ./bin/www. This will start the Node.js application running.


VS Code uses TypeScript type declaration (typings) files (for example node.d.ts) to provide metadata to VS Code about the JavaScript based frameworks you are consuming in your application. Type declaration files are written in TypeScript so they can express the data types of parameters and functions, allowing VS Code to provide a rich IntelliSense experience. Thanks to a feature called Automatic Type Acquisition, you do not have to worry about downloading these type declaration files, VS Code will install them automatically for you.


Node.js is also based on the JavaScript framework, but it is used for developing server-based applications. While going through the entire tutorial, we will look into Node.js in detail and how we can use it to develop server-based applications.


Using dynos to complete this tutorial counts towards your usage. We recommend using our low-cost plans to complete this tutorial. Eligible students can apply for platform credits through our new Heroku for GitHub Students program.


Before you continue, check that you have the prerequisites installed properly. Type each command below and make sure it displays the version you have installed. (Your versions might be different from the example.) If no version is returned, go back to the introduction of this tutorial and install the prerequisites.


Our Node.js tutorial includes all topics of Node.js such as Node.js installation on windows and linux, REPL, package manager, callbacks, event loop, os, path, query string, cryptography, debugger, URL, DNS, Net, UDP, process, child processes, buffers, streams, file systems, global objects, web modules etc. There are also given Node.js interview questions to help you better understand the Node.js technology.


Luckily, we've got your back. We've written a bunch of articles to help you get started with Node.js! If you're interested in exploring ES6, you should check out our article on some of the most exciting ES6 features in Node.js. If you're interested in ways to collaborate with your team a bit better, you should check out our tutorial on using ESLint in projects to improve team collaboration through code standards. Maybe you'd just like to start deploying the applications you're about to build? In that case, take a peek at our guide on how to deploy Node.js apps on Linux with systemd!


That said, if you want to keep in touch with Node.js and the surrounding ecosystem, you should go follow @NodeSource on Twitter! We'll keep you updated with important news from the Node.js project, and share the best Node.js tutorials, guides, and tools that the community has to offer.


For many users, using apt with the default repo will be sufficient. If you need specific newer or legacy versions of Node, you should use the PPA repository. If you are actively developing Node applications and need to switch between node versions frequently, choose the nvm method.


To follow this guide, you will need an Ubuntu 20.04 server set up. Before you begin, you should have a non-root user account with sudo privileges set up on your system. You can learn how to do this by following the Ubuntu 20.04 initial server setup tutorial.


Warning: the version of Node.js included with Ubuntu 20.04, version 10.19, is now unsupported and unmaintained. You should not use this version in production, and should refer to one of the other sections in this tutorial to install a more recent version of Node.


Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in our Questions & Answers section, find tutorials and tools that will help you grow as a developer and scale your project or business, and subscribe to topics of interest.


A common scenario for using Node.js with the SDK for JavaScript is to set up and run a Node.js web application on an Amazon Elastic Compute Cloud (Amazon EC2) instance. In this tutorial, you will create a Linux instance, connect to it using SSH, and then install Node.js to run on that instance.


This tutorial assumes that you have already launched a Linux instance with a public DNS name that is reachable from the Internet and to which you are able to connect using SSH. For more information, see Step 1: Launch an Instance in the Amazon EC2 User Guide for Linux Instances.


The node installation only applies to the current Amazon EC2 session. If you restart your CLI session you need to use nvm to enable the installed node version. If the instance is terminated, you need to install node again. The alternative is to make an Amazon Machine Image (AMI) of the Amazon EC2 instance once you have the configuration that you want to keep, as described in the following topic.


JavaScript frameworks are an essential part of modern front-end web development, providing developers with proven tools for building scalable, interactive web applications. This module gives you some fundamental background knowledge about how client-side frameworks work and how they fit into your toolset, before moving on to a series of tutorials covering some of today's most popular ones.


Wallaby.js is a continuous testing tool that enables real-time code coverage for Mocha with any assertion library in VS Code, Atom, JetBrains IDEs (IntelliJ IDEA, WebStorm, etc.), Sublime Text and Visual Studio for both browser and node.js projects.


You can read my previous tutorial to try Node.js with MySQL. You should read this guide to use Docker with Node.js, it is also a step-by-step guide. You can, of course, carry on with this Node.js with PostgreSQL tutorial :).


The --no-view parameter tells the generator to generate the Express app without any view like Pug. The other --git parameter indicates that we want to add the default .gitignore file in our Express app.It will create the needed files in nodesj-postgresql directory. Your express will be set up when the command runs successfully. To quickly check if Express is setup correctly run the below:


We want to save you from the hassle of creating and maintaining a database locally on your machine. You can have a free PostgreSQL database on Elephant SQL with 20 MB data and 5 concurrent connections. It is more than enough for the purpose of this tutorial.


To create the PostgreSQL database on Elephant SQL after registering please follow this documentation. Create the free (tiny turtle) database in the data center of your choice. If you want to learn more about PostgreSQL follow this multi-part tutorial on Elephant SQL.


It assumes that you have read the Introduction to gRPC and are familiarwith protocolbuffers. Notethat the example in this tutorial uses theproto3 version of the protocolbuffers language. You can find out more in theproto3 language guide.


Koa middleware cascade in a more traditional way as you may be used to with similar tools - this was previously difficult to make user friendly with node's use of callbacks. However with async functions we can achieve "true" middleware. Contrasting Connect's implementation which simply passes control through series of functions until one returns, Koa invoke "downstream", then control flows back "upstream".


A Koa Context encapsulates node's request and response objects into a single object which provides many helpful methods for writing web applications and APIs. These operations are used so frequently in HTTP server development that they are added at this level instead of a higher level framework, which would force middleware to re-implement this common functionality.


In this section, you will learn how to interact with MySQL from node.js applications using the mysql module. We will show you how to connect to MySQL, perform common operations such as insert, select, update and delete data in the database using mysql module API. After the tutorial, you can develop the node.js application using MySQL as the back-end database.


That should start our application and open the node-inspector interface in Chrome. Let's setup a breakpoint in the request handlers (by clicking on the line number for the one containing res.writeHead). Now open another tab and visit :1337. The browser should be in a loading stage, but switch to the node-inspector interface.


If you open the console you can inspect the request ansd response objects, modify them and so on. This is just a basic example to get you started with node-inspector, but in real-world applications you will stil benefit from these debugging techniques to track down more complicated issues. 041b061a72


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