CasperSecurity
# Usage and example
## Usage
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`node [options] [V8 options] [script.js | -e "script" | - ] [arguments]`
Please see the [Command Line Options][] document for more information.
## Example
An example of a [web server][] written with Node.js which responds with
`'Hello, World!'`:
Commands in this document start with `$` or `>` to replicate how they would
appear in a user's terminal. Do not include the `$` and `>` characters. They are
there to show the start of each command.
Lines that don’t start with `$` or `>` character show the output of the previous
command.
First, make sure to have downloaded and installed Node.js. See [this guide][]
for further install information.
Now, create an empty project folder called `projects`, then navigate into it.
Linux and Mac:
```console
$ mkdir ~/projects
$ cd ~/projects
```
Windows CMD:
```console
> mkdir %USERPROFILE%\projects
> cd %USERPROFILE%\projects
```
Windows PowerShell:
```console
> mkdir $env:USERPROFILE\projects
> cd $env:USERPROFILE\projects
```
Next, create a new source file in the `projects`
folder and call it `hello-world.js`.
Open `hello-world.js` in any preferred text editor and
paste in the following content:
```js
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello, World!\n');
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
```
Save the file, go back to the terminal window, and enter the following command:
```console
$ node hello-world.js
```
Output like this should appear in the terminal:
```console
Server running at http://127.0.0.1:3000/
```
Now, open any preferred web browser and visit `http://127.0.0.1:3000`.
If the browser displays the string `Hello, World!`, that indicates
the server is working.
[Command Line Options]: cli.html#cli_command_line_options
[this guide]: https://nodejs.org/en/download/package-manager/
[web server]: http.html