Node Js Beginner Tutorial

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Node.js is an open-source and cross-platform JavaScript runtime environment. It is a popular tool for almost any kind of project! Node.js runs the V8 JavaScript engine, the core of Google Chrome, outside of the browser.

This allows Node.js to be very performant. 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 that prevent JavaScript code from blocking and generally, libraries in Node.js are written using non-blocking paradigms, making blocking behavior the exception rather than the norm.

  • When Node.js performs an I/O operation, like reading from the network, accessing a database or the filesystem, instead of blocking the thread and wasting CPU cycles waiting, Node.js will resume the operations when the response comes back.
  • This allows Node.js to handle thousands of concurrent connections with a single server without introducing the burden of managing thread concurrency, which could be a significant source of bugs.
  • Node.js has a unique advantage because millions of frontend developers that write JavaScript for the browser are now able to write the server-side code in addition to the client-side code without the need to learn a completely different language.
  • In Node.js the new ECMAScript standards can be used without problems, as you don't have to wait for all your users to update their browsers - you are in charge of deciding which ECMAScript version to use by changing the Node.js version, and you can also enable specific experimental features by running Node.js with flags.
  • npm with its simple structure helped the ecosystem of Node.js proliferate, and now the npm registry hosts over 1,000,000 open source packages you can freely use.
  • The most common example Hello World of Node.js is a web server:.
  • This code first includes the Node.js http module. Node.js has a fantastic standard library, including first-class support for networking.

The createServer() method of http creates a new HTTP server and returns it. The server is set to listen on the specified port and host name.

8. Node.js Webserver with Express

When the server is ready, the callback function is called, in this case informing us that the server is running. Whenever a new request is received, the request event is called, providing two objects: a request (an http.IncomingMessage object) and a response (an http.ServerResponse object).

Those 2 objects are essential to handle the HTTP call. The first provides the request details. In this simple example, this is not used, but you could access the request headers and request data.

Node.js Syllabus

The second is used to return data to the caller. In this case with:. we set the statusCode property to 200, to indicate a successful response. We set the Content-Type header:.

and we close the response, adding the content as an argument to end():. Node.js is a low-level platform. In order to make things easy and exciting for developers, thousands of libraries were built upon Node.js by the community.

Many of those established over time as popular options.

A Vast Number of Libraries

Here is a non-comprehensive list of the ones worth learning:. AdonisJS: A TypeScript-based fully featured framework highly focused on developer ergonomics, stability, and confidence. Adonis is one of the fastest Node.js web frameworks.

Egg.js: A framework to build better enterprise frameworks and apps with Node.js & Koa. Express: It provides one of the most simple yet powerful ways to create a web server.

When to not use Node.js

Its minimalist approach, unopinionated, focused on the core features of a server, is key to its success. Fastify: A web framework highly focused on providing the best developer experience with the least overhead and a powerful plugin architecture.

Fastify is one of the fastest Node.js web frameworks. FeatherJS: Feathers is a lightweight web-framework for creating real-time applications and REST APIs using JavaScript or TypeScript.

Build prototypes in minutes and production-ready apps in days. Gatsby: A React-based, GraphQL powered, static site generator with a very rich ecosystem of plugins and starters.

  • hapi: A rich framework for building applications and services that enables developers to focus on writing reusable application logic instead of spending time building infrastructure.
  • koa: It is built by the same team behind Express, aims to be even simpler and smaller, building on top of years of knowledge.
  • The new project born out of the need to create incompatible changes without disrupting the existing community.
  • Makes it easy to build modern applications that require complex integrations.
  • Meteor: An incredibly powerful full-stack framework, powering you with an isomorphic approach to building apps with JavaScript, sharing code on the client and the server.
  • Once an off-the-shelf tool that provided everything, now integrates with frontend libs React, Vue, and Angular.
  • Can be used to create mobile apps as well.

Micro: It provides a very lightweight server to create asynchronous HTTP microservices. NestJS: A TypeScript based progressive Node.js framework for building enterprise-grade efficient, reliable and scalable server-side applications.

Next.js: React framework that gives you the best developer experience with all the features you need for production: hybrid static & server rendering, TypeScript support, smart bundling, route pre-fetching, and more.

Nx: A toolkit for full-stack monorepo development using NestJS, Express, React, Angular, and more!

Nx helps scale your development from one team building one application to many teams collaborating on multiple applications!

Remix: Remix is a fullstack web framework for building excellent user experiences for the web.

It comes out of the box with everything you need to build modern web applications (both frontend and backend) and deploy them to any JavaScript-based runtime environment (including Node.js).

Sapper: Sapper is a framework for building web applications of all sizes, with a beautiful development experience and flexible filesystem-based routing.

Offers SSR and more! A real-time communication engine to build network applications. Strapi: Strapi is a flexible, open-source Headless CMS that gives developers the freedom to choose their favorite tools and frameworks while also allowing editors to easily manage and distribute their content.

By making the admin panel and API extensible through a plugin system, Strapi enables the world's largest companies to accelerate content delivery while building beautiful digital experiences.

The modern web application has really come a long way over the years with the introduction of many popular frameworks such as bootstrap, Angular JS, etc.

All of these frameworks are based on the popular JavaScript framework.

But when it came to developing server-based applications, there was a kind of void, and this is where Node.js came into the picture.

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.

Questions still open? – Node.js FAQ

Node.js is an open-source, cross-platform runtime environment used for the development of server-side web applications. Node.js applications are written in JavaScript and can be run on a wide variety of operating systems.

Node.js is based on an event-driven architecture and a non-blocking Input/Output API that is designed to optimize an application’s throughput and scalability for real-time web applications.

10. Deploy (publish) Node.js app

Over a long period of time, the framework available for web development were all based on a stateless model.

A stateless model is where the data generated in one session (such as information about user settings and events that occurred) is not maintained for usage in the next session with that user.

A lot of work had to be done to maintain the session information between requests for a user. But with Node.js, there is finally a way for web applications to have real-time two-way connections, where both the client and server can initiate communication, allowing them to exchange data freely.

We will have a look into the real worth of Node.js in the coming chapters, but what is it that makes this framework so famous.

Over the years, most of the applications were based on a stateless request-response framework. In these sort of applications, it is up to the developer to ensure the right code was put in place to ensure the state of web session was maintained while the user was working with the system.

But with Node.js web applications, you can now work in real-time and have a 2-way communication.

The state is maintained, and either the client or server can start the communication. Let’s look at some of the key features of Node.js. Asynchronous event-driven IO helps concurrent request handling – This is probably the most significant selling point of Node.js.

This feature basically means that if a request is received by Node for some Input/Output operation, it will execute the operation in the background and continue with processing other requests.This is quite different from other programming languages.

A simple example of this is given in the code below. The above code snippet looks at reading a file called Sample.txt. In other programming languages, the next line of processing would only happen once the entire file is read.

But in the case of Node.js the important fraction of code to notice is the declaration of the function (‘function(error,data)’).

This is known as a callback function. So what happens here is that the file reading operation will start in the background. And other processing can happen simultaneously while the file is being read.

Once the file read operation is completed, this anonymous function will be called, and the text “Reading Data completed” will be written to the console log.

Node uses the V8 JavaScript Runtime engine, the one which is used by Google Chrome.

Node has a wrapper over the JavaScript engine which makes the runtime engine much faster and hence the processing of requests within Node also become faster.

Handling of concurrent requests – Another key functionality of Node is the ability to handle concurrent connections with a very minimal overhead on a single process.

The Node.js library uses JavaScript – This is another important aspect of development in Node.js. A major part of the development community is already well versed in javascript, and hence, development in Node.js becomes easier for a developer who knows javascript.

Master Class

There is an active and vibrant community for the Node.js framework.

  • Because of the active community, there are always keys updates made available to the framework.
  • This helps to keep the framework always up-to-date with the latest trends in web development.

  • Node.js is used by many large companies.
  • Below is a list of a few of them. Paypal – A lot of sites within Paypal have also started the transition onto Node.js.

  • LinkedIn – LinkedIn is using Node.js to power their Mobile Servers, which powers the iPhone, Android, and Mobile Web products.
  • Mozilla has implemented Node.js to support browser APIs which has half a billion installs.

    eBay hosts their HTTP API service in Node.js.

  • Node.js is best for usage in streaming or event-based real-time applications like.

Chat applications. Game servers – Fast and high-performance servers that need to processes thousands of requests at a time, then this is an ideal framework.

  1. Good forcollaborative environment – This is good for environments which manage documents.
  2. In a document management environment, you will have multiple people who post their documents and do constant changes by checking out and checking in documents.

  3. So Node.js is good for these environments because the event loop in Node.js can be triggered whenever documents are changed in a document managed environment.
  4. Advertisement servers – Again here you could have thousands of request to pull advertisements from the central server and Node.js can be an ideal framework to handle this.

  5. Streaming servers – Another ideal scenario to use Node is for multimedia streaming servers wherein clients have request’s to pull different multimedia contents from this server.
  6. Node.js is good when you need high levels of concurrency but less amount of dedicated CPU time.

    Best of all, since Node.js is built on javascript, it’s best suited when you build client-side applications which are based on the same javascript framework.

  7. Node.js can be used for a lot of applications with various purposes.

The only scenario where it should not be used is where there are long processing times, which is required by the application.

Node is structured to be single-threaded. If an application is required to carry out some long-running calculations in the background, it won’t be able to process any other requests.

As discussed above, Node.js is used best where processing needs less dedicated CPU time.

Installing on Node.js on Windows or on Windows Subsystem for Linux.

Open your command line and create a new directory: mkdir HelloNode, then enter the directory: cd HelloNode.

Create a JavaScript file named "app.js" with a variable named "msg" inside: echo var msg > app.js.

Open the directory and your app.js file in VS Code using the command: code .

Add a simple string variable ("Hello World"), then send the contents of the string to your console by entering this in your "app.js" file:.

Node.js Frameworks and Tools

To run your "app.js" file with Node.js. Open your terminal right inside VS Code by selecting View > Terminal (or select Ctrl+`, using the backtick character). If you need to change the default terminal, select the dropdown menu and choose Select Default Shell.

In the terminal, enter: node app.js. You should see the output: "Hello World". Notice that when you type console in your 'app.js' file, VS Code displays supported options related to the console object for you to choose from using IntelliSense. Try experimenting with Intellisense using other JavaScript objects. Open your command line (Command Prompt, Powershell, or whatever you prefer).

Create a new project folder: mkdir ExpressProjects and enter that directory: cd ExpressProjects.

Use Express to create a HelloWorld project template: npx express-generator HelloWorld --view=pug. We are using the npx command here to execute the Express.js Node package without actually installing it (or by temporarily installing it depending on how you want to think of it).

If you try to use the express command or check the version of Express installed using: express --version, you will receive a response that Express cannot be found.

If you want to globally install Express to use over and over again, use: npm install -g express-generator.

You can view a list of the packages that have been installed by npm using npm list.

They'll be listed by depth (the number of nested directories deep).

Packages that you installed will be at depth 0. That package's dependencies will be at depth 1, further dependencies at depth 2, and so on.

To learn more, see Difference between npx and npm?

on StackOverflow. Examine the files and folders that Express included by opening the project in VS Code, with: code .

The files that Express generates will create a web app that uses an architecture that can appear a little overwhelming at first.

You'll see in your VS Code Explorer window (Ctrl+Shift+E to view) that the following files and folders have been generated:. Contains the executable file that starts your app. It fires up a server (on port 3000 if no alternative is supplied) and sets up basic error handling. Contains all the publicly accessed files, including JavaScript files, CSS stylesheets, font files, images, and any other assets that people need when they connect to your website.

Contains all the route handlers for the application. Two files, index.js and users.js, are automatically generated in this folder to serve as examples of how to separate out your application’s route configuration.

Contains the files used by your template engine.

Express is configured to look here for a matching view when the render method is called. The default template engine is Jade, but Jade has been deprecated in favor of Pug, so we used the --view flag to change the view (template) engine. You can see the --view flag options, and others, by using express --help. The starting point of your app. It loads everything and begins serving user requests. It's basically the glue that holds all the parts together. Contains the project description, scripts manager, and app manifest.

Install the Express package dependencies with:. At this point you have the framework set up for a multiple-page web app that has access to a large variety of APIs and HTTP utility methods and middleware, making it easier to create a robust API.

Start the Express app on a virtual server by entering:.

The DEBUG=myapp:* part of the command above means you are telling Node.js that you want to turn on logging for debugging purposes.

Remember to replace 'myapp' with your app name.

You can find your app name in the package.json file under the "name" property. Using npx cross-env sets the DEBUG environment variable in any terminal, but you can also set it with your terminal specific way. The npm start command is telling npm to run the scripts in your package.json file. You can now view the running app by opening a web browser and going to: localhost:3000. Now that your HelloWorld Express app is running locally in your browser, try making a change by opening the 'views' folder in your project directory and selecting the 'index.pug' file. Once open, change h1= title to h1= "Hello World!"

and selecting Save (Ctrl+S). View your change by refreshing the localhost:3000 URL on your web browser. To stop running your Express app, in your terminal, enter: Ctrl+C.

In your command line, open the Node.js CLI. You'll see the > prompt letting you know you're using Node.js after entering: node.

To identify the operating system you are currently using (which should return a response letting you know that you're on Windows), enter: os.platform().

To check your CPU's architecture, enter: os.arch(). To view the CPUs available on your system, enter: os.cpus().

Why use Node.js?

Leave the Node.js CLI by entering .exit or by selecting Ctrl+C twice.

You can use the Node.js OS module to do things like check the platform and return a platform-specific variable: Win32/.bat for Windows development, darwin/.sh for Mac/unix, Linux, SunOS, and so on (for example, var isWin = process.platform"win32";).

This Node.js tutorial is aimed at developers who want to program with Node.js but know little or nothing about it yet – i.e.

complete beginners in this field.Advertisements. Node.js is becoming more and more popular: Especially when it comes to creating Rest APIs, Node is way out in front.

This Node.js tutorial is very practical and with some examples.

Nevertheless, I will briefly discuss the functionality, application and installation at the beginning.

From chapter 3 on we will start with the practical part.

In this tutorial you will learn the following:.

Table of Contents−5.

Create first Node.js App8. Node.js Webserver with Express. Create first Node.js App.

Node.js Webserver with Express.

With Node.js, the JavaScript scripting language has also made its way into server-side programming.

Before Node.js, JavaScript was mainly only responsible for the frontend and the interaction with the visitor.Advertisements.

With Node.js, however, it is now possible to develop everything from small CLI (command line) tools to complex programs and standalone HTTP servers.

Exactly this universal applicability makes Node.js so ingenious for me personally – and also for many other developers!

When a website is called up, the JavaScript code is executed at the visitor, i.e. With Node.js, on the other hand, JavaScript is executed on the requested server, i.e. This is the most obvious difference and sounds unspectacular at first. However, this fact changes most of the uses of JavaScript. In the browser, JavaScript is mainly responsible for manipulating the DOM. In Node.js, this task falls away and it is available for returning data. Thereby Node.js can also connect to a database (e.g.

MySQL or MongoDB).Advertisements. So Node.js acts as a kind of web server.

We will pick up on this point and write our own web server with Node.js later in this tutorial.

If you are now wondering if you really need and want to be able to use Node.js, you should read through the most frequently asked questions below and decide if Node.js is the right technology for you.

Another important reason for the success are the on-board tools that come with Node.js. From the ground up, Node.js already has many features and modules that are easy to use.

And to make it even more perfect, there is the package manager – also called npm (Node Package Manager).

You can find more information about it later in the Node.js Packages section. Anyway, it makes it very easy to add new features, extensions from other developers and the Node.js community.Advertisements. Of course, this sounds promising at first, but can you already imagine something concrete? At least it wouldn’t be very easy for me to read something like that about a topic I don’t know. That’s why it’s best to read this section again at the end of this post and I assure you, you’ll know what I’m talking about! Before we can start with the actual programming, we first have to install Node.js on our computer. To do this, select the operating system on which you want to develop.

On Windows, you can simply download the installer and follow the installation instructions.

It is best to download the LTS (Long-term support) version, as this is already established and has fewer bugs than the latest version. On the Mac, just like on Windows, you can download the official installer and follow the installation instructions.

Again, it is best to download the LTS (Long-term support) version, as this is already established and has fewer bugs than the latest version.

Features of Node.js

Depending on the Linux distribution you choose the appropriate installation command. CLI stands for Command-Line Interface and means command line.

On the Mac you can use the pre-installed program “Terminal” and on Windows the command prompt (cmd.exe). The CLI can be used to launch Node.js applications, install modules, and view error messages and log output.

Using the node command, we can now execute any JavaScript commands.

In the further course of this article you now know what you can understand by the CLI.

The crown jewels of Node.js are its packages. At the beginning I already mentioned that Node.js has a package manager. The abbreviation and the command for the CLI is npm (Node Package Manager). NPM is a gigantic network of development tools that you can download for free for your application.

If you work with Node.js, you will always use modules from other developers.Advertisements.

This offers many advantages:. Time saving, because you don’t have to program everything yourself.

Security vulnerabilities are (usually) closed promptly and you can update such a dependency with a command.

Standardization ensures easier handling between multiple developers.

Good documentation on existing interfaces. In this example we download the module express. This works with the following command:.

You can also install modules globally, which means that it applies to your entire computer and is not only available in one project. To do this, simply append the -g parameter. Some modules are also only required for development and are later superfluous in productive use.

If you use the --save-dev parameter, these are created as dev dependencies – i.e.

  1. only required for development.
  2. When you install a module, a corresponding entry is created in the package.json and the folder node_modules is created automatically.
  3. This contains all installed modules and can be ignored by you for now.

AdvertisementsTip: If you work with git, for example, you can exclude the node_modules folder in your .gitignore.

The folder can be recreated using the npm install command when you load your project on a different device.

We can include a module in the code with the require() function:. To take advantage of the already mentioned regular (security) updates you can always keep your packages up to date.

You can simply use this command:Advertisements. The time has come, we are finally starting to program.

To create a Node.js project, we simply create a normal folder in any directory. In it we create an index.js, which is our start file.

Now we need to say in this folder that we want to make it a Node.js app, we do that via this command in the CLI:. We will be asked for several parameters like package name, version and description.

You can fill in these fields or like me just leave them on default settings.

We can always change these settings later in the package.json. Now we can write the first JavaScript code in our index.js. Of course we can’t do without it and have to output “Hello World”.

The first code is written and we want to start our program.

We do that with this command:. We get the following result:. Granted, at the beginning of the Node.js tutorial, this all sounded much cooler. But don’t worry, there’s more.

try JavaScript functions in this file to e.g.

simply add two numbers and output them on the console. Just play around with it for 10 minutes and then read on. A package.json file has now been created in our folder. In this file all information about our application, such as the author, version and most importantly, about all installed dependencies (packages) are stored in JSON.

If you install packages, they will also appear in this list.

Under dependencies you will find all “normal” dependencies and under devDependencies you will find all packages that were installed with the parameter --save-dev. Reminder: These are only necessary for development and are no longer installed in production use.

Under scripts you can create your own scripts, e.g.

What is Node.js?

to execute test routines automatically or to automate other tasks.

If you want to learn more about this, have a look at this tutorial. It’s really annoying when we have to manually restart our Node.js app after every small change to the code, right?

Right, that’s why there is a module called nodemon which we install globally. This module detects file changes and restarts the Node.js app within milliseconds.

This speeds up our workflow tremendously.

  1. After the installation we start Nodemon via this command and directly our app is started and automatically restarted in case of changes.
  2. Now when you save your files inside the project folder, the Node.js app will automatically restart.

I don’t want to deprive you of one very central function: Environment variables.

They are quite an important thing when it comes to variable properties like credentials, configuration email addresses or file paths.

Here is an example:. You have a local database running on your local PC with the user test and the password 123456 (hopefully not 🙂 ).

If you want to connect to it with your Node.js application, you would have to include these credentials statically in your source code.

But on your production system you have completely different credentials. So no connection can be established. And using the same credentials is not an option, because it is insecure, sometimes not feasible and also in cases like changing file paths not feasible at all.

And that’s why we use environment variables. You provide a kind of project global variable in which we can store the required data. Our application then fetches this data automatically.

On our live system we can then work with completely different values without having to adapt our source code.

For the development we use the package dotenv(npm install dotenv --save-dev) and create the file .env in our main directory and write there one variable with value per line.

To access it in our Node.js app, we need the line highlighted in red.

Via process.env.VARIABLE we can then retrieve the corresponding value.

Attention: The .env file should not be uploaded to your git repository and should not be made public, because it may contain sensitive access data!

  1. Just add the file to your .gitignore.
  2. When our application is running on a production system, the .env file is no longer needed.
  3. The environment variables are then set in other places – this varies depending on the hosting.
  4. In my Plesk hosting this view looks like this:.

We can now write and execute functions and output texts from the console. However, the user of our application has nothing of this, since he can only access it via the browser.

So now we set up a web server and deliver content to the user in the browser. Exactly the same thing happens when a website is called up. To do this, we install the express module using the following command, if not already done in step 4:. And we customize our index.js as follows:. To help you understand everything, here’s a line-by-line explanation:. If we now request our computer on port 3000 from the browser, we get this result:. That’s why Node.js is so awesome. You need just seven lines of code for your own web server. Let’s take a break from coding for a moment, we need a small theory block for HTTP request methods. A request from a client (e.g. browser) to a server is called a request. The response from the server to the client is called Response.

We use the variables req and res in front of it in the code. When you call a website, a GET request is executed in the background.

But there are many more types, which are especially important for the development of Rest APIs.

Here are the most important ones in short form:.

GET: Requests resources from the server.

POST: Sends data (e.g. in the request body) with which the server is to create a new resource.

PUT: Also sends data to the server with which it should update an existing resource. DELETE: Deletes a resource from the server. Resources can be very different things: a temporary object, an entry from a database or a simple file.

  • It depends on your application.
  • A list of all available HTTP request methods can be found here.
  • If you want to know more about HTTP request methods, I can recommend this article.
  • In this tutorial we will only use the GET method.
  • You can find more tutorials at the end of this post.

When to Use Node.js

Now, if we adjust our route a little bit, we can return data that has already been passed:.

Here :yourName stands for a variable string (note the colon!) that we can pass in our URL and with req.params.yourName we can read it and send the name back to the user. If we now call http://localhost:3000/test, we get the string with the passed name as response. With it you can already read and send data and that with really little code.

Who uses Node.js

This approach is the basis for creating a Rest API. Meanwhile, you should also always test your application directly for anomalies and write test cases.

A post on creating Rest APIs with Node.js is already in the works. Rest APIs are the main use of Node.js and therefore so essential! If you don’t want to miss this, feel free to subscribe to our newsletter! We now want to use our Node.js server to send simple static HTML files to the browser. To do this, we first create an HTML file with our website in the public folder. Important: In the public folder you should only put files that are also “intended for the public”.

1. What is Node.js?

This convention is important to avoid sharing private/sensitive code.

We now create a GET route for the path /html-example. There we use on our res variable the function sendFile() to pass a path where our file is located.

As second parameter we can specify an array with further options.

More Tutorials

There we pass the property root with the constant __dirname.

5. Create first Node.js App

This contains the current path where the JS file is located. Around it we have a try-catch block in case the file cannot be read.

If we now call http://localhost:3000/html-example, our static HTML page appears.

If we want Node.js to act only as a web server and just serve all the files that are in the public folder, we can implement this with a simple line:. I have created another-page.html and included a CSS file. All files can now be easily accessed by name: http://localhost:3000/another-page.html. Many Node.js tutorials forget to show how to eventually deploy (publish) a Node.js app. Most of the time they just stop after the basics. You can of course run your app locally, but it doesn’t make sense if you want to share an app with others. A free way to host Node.js apps is Heroku. You can simply follow this guide. Of course, the free model at Heroku doesn’t have all the features, e.g. you can’t use your own domain. Another possibility to deploy a Node.js app is the own server with Plesk as administration software. Such servers are already available for less than 10 Euros per month and are perfectly suitable for development, testing and also for productive use!

To deploy Node.js apps with Plesk you can find a tutorial here. Quite a lot of information at once, isn’t it?

Nevertheless, I hope you got a good impression of what’s possible with Node.js and that I made you curious for more.

If you have any unanswered questions, feel free to post them in the comments!

On my blog you can find many more tutorials and articles about Node.js.

Scroll down a little bit, there you will see more posts.

If you want to start with the development of Rest APIs I can already recommend this tutorial.

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An Example Node.js Application

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4. Node.js Packages (Modules)

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Node.js Tutorial. Node.js Useful Resources. Selected Reading. Node.js is a very powerful JavaScript-based platform built on Google Chrome's JavaScript V8 Engine.

It is used to develop I/O intensive web applications like video streaming sites, single-page applications, and other web applications.

Node.js is open source, completely free, and used by thousands of developers around the world.

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.

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. 44 Lectures 7.5 hours . Eduonix Learning Solutions. 88 Lectures 17 hours . Eduonix Learning Solutions. 32 Lectures 1.5 hours . 8 Lectures 33 mins. 9 Lectures 2.5 hours . SHIVPRASAD KOIRALA.

97 Lectures 6 hours . Join 426+ developers already learning Nodejs Beginner tips & tricks. After building hundreds of Node.js APIs, backends, and CLIs used bymillions of developers, I am sharing exactly how you can do it yourself with minimum effective effort.

Learn Node.js from scratch.

9. Reading files with Node.js

Build scalable realtime systems with production-grade APIs and CLIs. Impress your manager andhelp the community.→ I'm sharing it all in this online video course.

Or if you're already convinced pre-order nowat 10% off! Full-time #OpenSourcerer Google Developers Expert Web Dev Advocate Node.js Community Committee Member Author of variousopen-source dev-tools and software libraries used by millions of developers worldwide (inc.

engineers at Google, AWS, Microsoft, Intel, HP…) TEDx Speaker Regular WordPress Core Developer Member of SmashingMagazine Experts Panel, Featured/published author at CSS-Tricks, Tuts+,, TorqueMag, SitePoint… A Self-confessed hilarious comedian.

Connect with Awais on twitter @MrAhmadAwais.Awais was recently listed as#1 JavaScript Developer on GitHub Trending Worldwide.

Check out his work oncorona-cli,Shades of Purple theme,wp-continuous-deployment,create-guten-block,Emoji Log, and many moreopen-source projectson GitHub.

I've already started recording this course. This is for both absolute beginners to advanced developers.

Launching in a month. Your support right away would be very helpful in these trying times of COVID-19 outbreak, especially as a dev spending most of my time producing free and open-source software. I assure you this ridiculous hard work is worth its weight in gold. This is the course I wish I had.Got questions?

Tweet me at @MrAhmadAwais →. ACCESS:All Modules. VIDEOS:Every Course Video.

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EXAMPLES:Over 10 Node.js CLI Projects. COMMUNITY:Free Access to Private Slack. EVERYTHING:Including all lessons & modules.

VALUE FOR MONEY:14 days refund (no Q/A).

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You don't have to take my word for it. Some nice folks have said some nice things! Shit, I didn't know that!!!!!!! This tip is life changing to me!!

Suuuuper stoked for this. I just picked up my copy of NodeCLI course! I can't wait to take my CLI skills to the next level. Fisted handFisted handFlexed bicepsFlexed biceps Keep up the great [email protected] Wow; the quality of the courses is outstanding. Really great work Ahmad Awesome work! 🚀 Today for #devAdvent: the very hardworking @MrAhmadAwais! Ahmad is a WordPress Core member and TEDx speaker and he recently created a course to help people become VS Code Power Users. If you're using VSCode as your editor, is a fun/cool resource!

Ahmad's Open Source: "It's very impressive".

— Won Automattic Design Award Trophy. The create-guten-block project is an awesome awesome contribution to the community — at AWP Gutenberg series.

I also just made the decision to move away from PHPStorm to VSCode. I mean, just one year in license fees pays for the master package and I'll learn from one of the best Just by going through the UI improvements videos, I can already see how the course will help me become #VSCODEpro. How do you find those class names?" — Said in response to a VSCode tip shared by Ahmad on Twitter. It’s a 5 hour course that teaches you a huge amount of knowledge and after going through it myself, I can state that even as a fairly advanced user of VS Code, Ahmad taught me some neat tricks that I immediately am integrating into my workflow now.

I've been using VSCode for a few months and I'm not a power user at all.

Thanks to @MrAhmadAwais for creating an amazing course to help me bridge that gap in a short time. I highly recommend his course if you're looking to level up your VSCode game. If you're looking to expand your VSCode knowledge, I have no doubt this course will be extremely useful. @MrAhmadAwais does great work. Just grabbed @MrAhmadAwais's #VSCODEpro course masterclass. If you use any code editor, make the move. Support Ahmad :) he's a top guy — does great work. I love this theme! 🦄Themes with more unique colors like purple are relatively rare, so it's great to see purple represented here 😃.

It's a fun theme, and it's easy to read! Kudos to the teacher @MrAhmadAwais for making the #VSCODEpro learning a breeze.

I am on the 14th chapter and this is getting as exciting as a binge learning. Ahmad, your hard work is making a student's life easy.

You deserve great respect. I always find him to be an excellent communicator, highly skilled, considerate, and extremely generous.

Introduction to Node.js

He's a pleasure to collaborate with and he's produced some very impressive public and FREE #OpenSource work for developers to learn and benefit from.

In my book, those are some of the best characteristics to have in a person.

Ahmad is highly recommended. I've never known someone to create such useful things on a regular basis.

Truly impressive sir. You just pump stuff out. It's incredible. I've read over Ahmad's tutorial a few times and implemented most of it. He's the bee's knees for this kind of stuff.

— In ref to the WordPress & Gulp implementation via WPGulp. This is a gorgeous, high contrast theme that stands out without getting in the way.

Especially great for doing developer talks and screencasts and maintained by a supremely dedicated expert in all the VSCode pro tips.

The documentation itself is a thing of beauty, too.

Yes, Ahmad writes great WordPress tutorials and makes great looking themes and websites, but that's not the only reason I endorse Ahmad.

Ahmad is a great community member, he is a core contributor to WordPress and always helpful to other WordPress users.

Also, he is a really nice guy, which is important.

Ahmad has written tutorials for me to publish at Tuts+ on a number of occasions, and I always appreciate his level of expertise both in the subject matter…, and in helping to educate others.

I would hire Ahmad again for… training or consultancy in a heartbeat.

I know Awais from his contributions to world wide web. His expertise in web & software technologies and his contributions to various open-source projects make it stand out of the crowd.

I highly recommend Ahmad.

I'm really impressed with how much you are participating in the WordPress community! It's pretty insane. You're probably one of the most engaged people I have seen, ever.

It is extremely rare that you come across highly skilled talent like Ahmad!

We worked together on several occasions over the years and his efficiency is beyond superior.

Ahmad regularly contributes to WordPress core for code and UX improvements. He is one of the most passionate developers I have ever met with an insatiable desire to streamline the workflow of the process of everything he works on. He dives in head first to any new challenges and conquers them with his tenacity and intelligence which make Ahmad an invaluable asset to any project. Ahmad is a very thorough writer and he is extremely knowledgeable of the WordPress industry. He knows exactly what is going on in the WordPress community and his outreach is an addition to any blog. I would recommend him. I switch syntax themes so often, but I haven't felt the need to switch since using 🦄 Shades of Purple for the past 6 months, it's my new default 😃 - keep up the good work man! Amazing job with balancing out the colors to ensure it's not overloading the eyes.

The comments, and markdown syntax semi-hidden state styling is also a good idea! If it's not critical to always see this information then it makes sense to reduce it's visibility.

I jumped ship from Cobalt 2 by Wes to 🦄 Shades of Purple theme by Ahmad Awais and I'm not looking back, beautiful shades of purple lighten up my code in a way that no other theme can, great job Ahmad!

3. The CLI as a tool for Node.js

At we always use Shades of Purple for all our PHP/HTML/JS/CSS and other languages. It's so beautiful and easy to read, we also added some slight tweaks to make it even better and we could not be happier that we found it.

Ahmad takes his extension seriously and fixed a bug for me overnight. A fantastic theme that is both attractive but more importantly, effective in bring your attention to the import parts of your code.

I started loving the 🦄 Shades of Purple theme from its name ;) After seeing images of the themes, I saw there was more and to get to know about the 'more', an installation will have to occur which did occur..After installation, I got to find out that the theme is super duper awesome than I thought… Welldone Ahmad Awais.

Just installed 🦄 Shades of Purple and absolutely love it!

Thank you for creating it! I love these colors!

I also switched from Cobalt2. And just beginning a new job as a React.js dev, with it :-).

I started using SOP during the better release and ever since it has being a perfect choice for me.

Love to see my IDE always with the shades of purple splash.

It improved my overall workflow. Thanks @AhamadAwais for such work.

Have been using 🦄 Shades of Purple theme for the last couple of weeks and in love with it.

Its fun writing code with those shades of purple <3.

To dig deeper into Redis, you can visit this tutorial.

2. Install Node.js

Let’s learn how to deploy our Node application. I deploy all my projects on DigitalOcean. I highly recommend it to developers. If you have never tried DigitalOcean, give it a shot with a $10 discount for the first month.

Click here to go to the DigitalOcean droplet creation screen.

Choose a $5 plan and create the droplet. After creating a droplet wait for some time, DigitalOcean will send you an email containing the credentials. Login to your droplet using the following command.

Provide the password given in the email and you are good to go.

Once you are logged in, update the system using the following command.

Install Git.

Install the latest Node on your Server.

curl -sL | sudo -E bash -

sudo apt-get install -y nodejs

Install the PM2 process manager.

Our server is ready to host our Node applications.

Github is a code hosting platform. Learn how to host your code in the Github platform.

Let’s push our code to Github. Go to and create a new repository.

Copy the repository path. Assuming you have Git installed in your machine. Switch to the project directory and execute these commands one by one.

git init
git add .
git commit - m "first push"
git remote add origin << github repo URL >>
git push origin master

Login to your server using SSH.

Clone the Github project.

Switch to the project directory.

Install dependencies.

Run the Node project using PM2.

PM2 is a process management tool for Node. Using PM2 we can ensure 99% uptime of your application.

Test your application using Droplet IP and port on which your application is running.

Awesome. You have successfully developed and deployed your application. Here is another article related to deployment of application in the production server.

7. Environment variables in Node.js

I have created a PDF format of this Node js tutorial for beginners. You can visit this page to download the book.

Learn Node.js from scratch

We have written a lot of Node js tutorials on different topics, listing some of the best articles for you to read it further.

Building Email Verification System Using Node and Redis
Microservices Architecture with Node.js
Load Balancing Node.js Application Servers with Nginx
Building a URL Shortener with Node.Js and Redis
Load Balancing Node.js Application Servers with Nginx