node js ebook download pdf

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A PDF Reference for The Complete Nodejs Dev Course

Node js works and why Node js is a tool worth learning Lesson 2: Installing Node js and Visual Studio Code In this lesson you’ll install Node js and Visual Studio Code Both are free open source and available for all operating system They’re the only tools needed to get started with Node! Below are links to both tools

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Fourth Edition Nodejs Web Development

project to Yahoo\'s Node js application-hosting platform and a solar array performance monitoring service David writes about electric vehicles green technology on The Long Tail Pipe website and about other topics including Node js on TechSparx website Using Node js he developed the AkashaCMS static website generator

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How to Code in NodeJS

About DigitalOcean Introduction How To Write and Run Your First Program in Node js How To Use the Node js REPL How To Use Node js Modules with npm and package json How To Create a Node js Module How To Write Asynchronous Code in Node js How To Test a Node js Module with Mocha and Assert How To Create a Web Server in Node js with the HTTP Module Usi

What is the Node JS notes for professionals book?
The Node.js Notes for Professionals book is compiled from Stack Overflow Documentation, the content is written by the beautiful people at Stack Overflow. The Node Craftsman Book helps JavaScript programmers with basic Node.js knowledge to now thoroughly master Node.js and JavaScript.
What is a Node JS module?
Modules baked into Node.js binary Some modules are pre-compiled into the Node.js binary. These are the core Node.js modules documented on the Node.js website at https://nodejs. org/api/index.html. They start out as source code within the Node.js build tree. The build process compiles them into the binary so that the modules are always available.
How does a NodeJS app work?
A Node.js app is run by a single process, without creating a new thread for every request.
Is Node JS open source?
Many Node.js modules are open source, so npm sets the default to ISC. At this point, you would review your licensing options and decide what’s best for your project. For more information on different types of open source licenses, see this license list from the Open Source Initiative.

How To Code in Node.js

About DigitalOcean Introduction How To Write and Run Your First Program in Node.js How To Use the Node.js REPL How To Use Node.js Modules with npm and package.json How To Create a Node.js Module How To Write Asynchronous Code in Node.js How To Test a Node.js Module with Mocha and Assert How To Create a Web Server in Node.js with the HTTP Module Usi

About this Book

Node.js is a popular open-source runtime environment that can execute JavaScript outside of the browser. The Node runtime is commonly used for back-end web development, leveraging its asynchronous capabilities to create networking applications and web servers. Node is also a popular choice for building command line tools. In this book, you will go

Learning Goals and Outcomes

The chapters in this book cover a broad range of Node topics, from using and packaging your own modules, to writing complete web servers and clients. While there is a general progression that starts with installing Node locally and running small Node programs on the command line, each chapter in this book can be read independently of the others. If

How To Write and Run Your First Program in Node.js

Written by Stack Abuse The author selected the Open Internet/Free Speech Fund to receive a donation as part of the Write for DOnations program. Node.js is a popular open-source runtime environment that can execute JavaScript outside of the browser using the V8 JavaScript engine, which is the same engine used to power the Google Chrome web browser’s

Step 1 — Outputting to the Console

To write a “Hello, World” program, open up a command line text editor such as nano and create a new file: nano hello.js With the text editor opened, enter the following code: assets.digitalocean.com

hello.js

console.log("Hello World"); The console object in Node.js provides simple methods to write to stdo ut, stderr, or to any other Node.js stream, which in most cases is the command line. The log method prints to the stdout stream, so you can see it in your console. In the context of Node.js, streams are objects that can either receive data, like the s

Step 2 — Running the Program

To run this program, use the node command as follows: node hello.js The hello.js program will execute and display the following output: assets.digitalocean.com

Output

Hello World The Node.js interpreter read the file and executed console.log("Hello W orld"); by calling the log method of the global console object. The string "Hello World" was passed as an argument to the log function. Although quotation marks are necessary in the code to indicate that the text is a string, they are not printed to the screen. Havi

Step 3 — Receiving User Input via Command Line Arguments

Every time you run the Node.js “Hello, World” program, it produces the same output. In order to make the program more dynamic, let’s get input from the user and display it on the screen. Command line tools often accept various arguments that modify their behavior. For example, running node with the --version argument prints the installed version i

arguments.js

console.log(process.argv); The process object is a global Node.js object that contains functions and data all related to the currently running Node.js process. The argv property is an array of strings containing all the command line arguments given to a program. Save and exit nano by typing CTRL+X, when prompted to save the file, press Y. Now when

Output

[ '/usr/bin/node', '/home/sammy/first-program/arguments.js', 'hello', 'world' ] The first argument in the process.argv array is always the location of the Node.js binary that is running the program. The second argument is always the location of the file being run. The remaining arguments are what the user entered, in this case: hello and world.

arguments.js

console.log(process.argv.slice(2)); Because argv is an array, you can use JavaScript’s built-in slice method that returns a selection of elements. When you provide the slice function with 2 as its argument, you get all the elements of argv that comes after its second element; that is, the arguments the user entered. Re-run the program with the node

Step 4 — Accessing Environment Variables

Environment variables are key-value data stored outside of a program and provided by the OS. They are typically set by the system or user and are available to all running processes for configuration or state purposes. You can use Node’s process object to access them. Use nano to create a new file environment.js: nano environment.js Add the followin

environment.js

console.log(process.env); The env object stores all the environment variables that are available when Node.js is running the program. Save and exit like before, and run the environment.js file with the node command. node environment.js Upon running the program, you should see output similar to the following: assets.digitalocean.com

Step 5 — Accessing a Specified Environment Variable

In this step you’ll view environment variables and their values using the global process.env object and print their values to the console. The process.env object is a simple mapping between environment variable names and their values stored as strings. Like all objects in JavaScript, you access an individual property by referencing its name in squa

environment.js

console.log(process.env["HOME"]); Save the file and exit. Now run the environment.js program: node environment.js The output now looks like this: assets.digitalocean.com

Output

/home/sammy Instead of printing the entire object, you now only print the HOME property of process.env, which stores the value of the $HOME environment variable. Again, keep in mind that the output from this code will likely be different than what you see here because it is specific to your system. Now that you can specify the environment variable

Step 6 — Retrieving An Argument in Response to User Input

Next, you’ll use the ability to read command line arguments and environment variables to create a command line utility that prints the value of an environment variable to the screen. Use nano to create a new file echo.js: nano echo.js Add the following code: assets.digitalocean.com

echo.js

const args = process.argv.slice(2); console.log(process.env[args[0]]); The first line of echo.js stores all the command line arguments that the user provided into a constant variable called args. The second line prints the environment variable stored in the first element of args; that is, the first command line argument the user provided. Save and

How to Create PDF Document in Node.js Using PDF-Creator-Node Library

Generate & Download Pdf File With Node js Beautiful Invoice PDF FILE Node JS EJS Template

Node.js PDF tutorial with pdfkit and express

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