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Node.js Introduction

Node.js uses asynchronous programming!

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"

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