Node.js Notes

Node.js Project Home Page

What is Node.js?

Node.js is a JavaScript runtime, which means you can use it to execute JavaScript outside the browser. It's essentially Javascript running on the server.

It's an Open Source server environment that runs JavaScript; this means you can run JavaScript on a machine and not just in the browser.

A Javascript runtime for servers.

Is fast and efficient. Uses an event-driven non-blocking I/O model - operates on single thread, can handle tens of thousands of connections concurrently. Uses an Event listener. Compare this to PHP where each connection spawns a new thread and takes up system memory, and eventually maxes out the maximum memory load.

How to See if Node is Installed

To see if node is installed:

cmd prompt / node -v

To see if npm is installed:

cmd prompt / npm -v

npm is Node Package Manager, allows you to install packages and modules for Node.

Create a Basic Web Server

https://youtu.be/U8XF6AFGqlc?t=993

npm init

Creates a package.json file.

https://www.youtube.com/watch?time_continue=924&v=U8XF6AFGqlc

Command Line

C:/Program Files/nodejs/node.exe

This is a command line where you can run JavaScript.

GetElementById does not work because this is JavaScript without the browser.

Express

Web development framework.

npm - Node.js Package Manager

Used to install node modules/programs.

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