NodeJS-examples

• What is Node.js?

  • Node.js is an open source server environment

  • Node.js is free

  • Node.js runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)

  • Node.js uses JavaScript on the server

• Why Node.js?

  • Node.js uses asynchronous programming!

  • A common task for a web server can be to open a file on the server and return the content to the client.

  • Here is how PHP or ASP handles a file request:

    • Sends the task to the computer's file system.

    • Waits while the file system opens and reads the file.

    • Returns the content to the client.

    • Ready to handle the next request.

  • Here is how Node.js handles a file request:

    • Sends the task to the computer's file system.

    • Ready to handle the next request.

    • When the file system has opened and read the file, the server returns the content to the client.

  • Node.js eliminates the waiting, and simply continues with the next request.

  • Node.js runs single-threaded, non-blocking, asynchronous programming, which is very memory efficient.

• What Can Node.js Do?

  • Node.js can generate dynamic page content

  • Node.js can create, open, read, write, delete, and close files on the server

  • Node.js can collect form data

  • Node.js can add, delete, modify data in your database

• What is a Node.js File?

  • Node.js files contain tasks that will be executed on certain events

  • A typical event is someone trying to access a port on the server

  • Node.js files must be initiated on the server before having any effect

  • Node.js files have extension ".js"

NodeJS documentation, homepage, examples

• https://nodejs.org

• https://www.w3schools.com/nodejs/

NodeJS install, using

• Linux RedHat/CentOS/Fedora:

   ~# dnf install nodejs

• Running:

   ~# node myapp.js

• NPM (Package management):

   ~# npm install module_name

:)