Node.js Get Started
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Node.js Get Started
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Download Node.js
The official Node.js website has installation instructions for Node.js:
https://nodejs.org
Getting Started
Once you have downloaded and installed Node.js on your computer, lets try to
display "Hello World" in a web browser.
Create a Node.js file named "myfirst.js", and add the following
code:
myfirst.js
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end('Hello World!');
}).listen(8080);Save the file on your computer: C:UsersYour Namemyfirst.js
The code
tells the computer to write "Hello World!" if anyone (e.g. a web browser) tries
to access your computer on port 8080.
For now, you do not have to
understand the code. It will be explained later.
Command Line Interface
Node.js files must be initiated in the "Command Line Interface" program
of your computer.
How to open the command line interface on your computer depends on the operating system. For Windows users, press the start button and look for
"Command
Prompt", or simply write "cmd" in the search field.
Navigate to the folder that contains the file "myfirst.js", the
command line interface
window should look something like this:
C:UsersYour Name>_
Initiate the Node.js File
The file you have just created must be initiated by Node.js before any action
can take place.
Start your command line interface, write node myfirst.js and hit enter:
Initiate "myfirst.js":
C:UsersYour Name>node myfirst.js
Now, your computer works as a server!
If anyone tries to access your computer on port 8080, they will get a "Hello
World!" message in return!
Start your internet browser, and type in the address: http://localhost:8080
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