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myavr.info were invaluable in guiding me through the development of this book, you know that Packt offers eBook versions of every book published, with PDF. Mastering Node eBook. Open Source Node eBook. pdf · epub · mobi · html. Created by TJ Holowaychuk. 20 best free Node JS books. Download ebooks (pdf, mobi, epub) and read online . Update of June collection. 4 new books.

The simplest way to go about coloring the console output is by using a library. Chalk is such a library, and in addition to coloring it also helps with other styling facilities, like making text bold, italic or underlined.

Check the project link I posted above for more usage examples. Create a progress bar Progress is an awesome package to create a progress bar in the console. Install it using npm install progress.

This snippet creates a step progress bar, and every ms one step is completed. Node since version 7 provides the readline module to perform exactly this: get input from a readable stream such as the process.

The question method shows the first parameter a question and waits for the user input.

It calls the callback function once enter is pressed. In this callback function, we close the readline interface. The simplest way is to use the readline-sync package which is very similar in terms of the API and handles this out of the box.

A more complete and abstract solution is provided by the Inquirer. Expose functionality from a Node. A Node. In this file, functionality must be exposed before it can be imported by other files. Any other object or variable defined in the file by default is private and not exposed to the outer world. This is what the module. As such, it can be imported in other parts of your app, or in other apps as well.

You can do so in 2 ways. The first is to assign an object to module. The first exposes the object it points to. The latter exposes the properties of the object it points to.

Introduction to npm npm means node package manager. In January over , packages were reported as being listed in the npm registry, making it the biggest single language code repository on Earth, and you can be sure there is a package for almost! It started as a way to download and manage dependencies of Node.

There are many things that npm does. Downloads npm manages downloads of dependencies of your project. Installing all dependencies If a project has a packages. And this time for real. Here is the problem: Because JavaScript really lives two, maybe even three lives the funny little DHTML helper from the mid's, the more serious frontend stuff like jQuery and the likes, and now server-side , it's not that easy to find information that helps you to learn JavaScript the "right" way, in order to write Node.

Because that's the catch: There is, of course, excellent documentation out there. But documentation alone sometimes isn't enough. What is needed is guidance. There are some really excellent JavaScript people out there. I'm not one of them.

I'm really just the guy I talked about in the previous paragraph. I know a thing or two about developing backend web applications, but I'm still new to "real" JavaScript and still new to Node. I learned some of the more advanced aspects of JavaScript just recently. I'm not experienced.

Which is why this is no "from novice to expert" book. It's more like "from novice to advanced novice". If I don't fail, then this will be the kind of document I wish I had when starting with Node.

The first incarnations of JavaScript lived in browsers. But this is just the context. It defines what you can do with the language, but it doesn't say much about what the language itself can do.

JavaScript is a "complete" language: In order to execute the JavaScript you intend to run in the backend, it needs to be interpreted and, well, executed.

This is what Node. Plus, Node. Thus, Node.

In order to make use of these, you need to install Node. Instead of repeating the process here, I kindly ask you to visit the official installation page. Please come back once you are up and running. Ok, let's just jump in the cold water and write our first Node.

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Open your favorite editor and create a file called helloworld. Ok, this stuff is boring, right? Let's write some real stuff. Fair enough. Now, you could achieve this goal by googling and hacking together something. But that's not what we want to do here.

Table of contents

Furthermore, we don't want to write only the most basic code to achieve the goal, however elegant and correct this code might be.

We will intentionally add more abstraction than necessary in order to get a feeling for building more complex Node.

Let's dissect our application. Which parts need to be implemented in order to fulfill the use cases? Let's think a moment about how we would build this stack with PHP. Which in turn means that the whole "we need to be able to serve web pages and receive HTTP requests" stuff doesn't happen within PHP itself. Well, with node, things are a bit different.

Because with Node. In fact, our web application and its web server are basically the same. This might sound like a lot of work, but we will see in a moment that with Node. Let's just start at the beginning and implement the first part of our stack, the HTTP server. When I arrived at the point where I wanted to start with my first "real" Node.

Do I need to have everything in one file? What if I want to make sure that my code stays readable the more stuff I implement? Turns out, it's relatively easy to keep the different concerns of your code separated, by putting them in modules. This allows you to have a clean main file, which you execute with Node. So, let's create a main file which we use to start our application, and a module file where our HTTP server code lives.

My impression is that it's more or less a standard to name your main file index. It makes sense to put our server module into a file named server. Let's start with the server module. Create the file server.

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That's it! You just wrote a working HTTP server. Let's prove it by running and testing it. First, execute your script with Node. Now, open your browser and point it at http: This should display a web page that says "Hello World". That's quite interesting, isn't it. How about talking about what's going on here and leaving the question of how to organize our project for later?

I promise we'll get back to it.

The first line require s the http module that ships with Node. We then call one of the functions the http module offers: This function returns an object, and this object has a method named listen , and takes a numeric value which indicates the port number our HTTP server is going to listen on.

Please ignore for a second the function definition that follows the opening bracket of http.Properties breakdown This section describes the properties you can use in detail. Which is why this is no "from novice to expert" book.

But documentation alone sometimes isn't enough. The really good thing about this book is that it also gives you an introduction to some of the most commonly used modules, accelerating your development rate immensely. Let's prove it by running and testing it. We can do this by assigning our function to a variable, which we then pass, or by defining the function to pass in-place.

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