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# Usage
<!--introduced_in=v0.10.0-->
<!--type=misc-->
`node [options] [V8 options] [script.js | -e "script" | - ] [arguments]`
Please see the [Command Line Options][] document for information about
different options and ways to run scripts with Node.js.
## Example
An example of a [web server][] written with Node.js which responds with
`'Hello, World!'`:
Commands displayed in this document are shown starting with `$` or `>`
to replicate how they would appear in a user's terminal.
Do not include the `$` and `>` characters. They are there to
indicate the start of each command.
There are many tutorials and examples that follow this
convention: `$` or `>` for commands run as a regular user, and `#`
for commands that should be executed as an administrator.
Lines that don’t start with `$` or `>` character are typically showing
the output of the previous command.
Firstly, 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.
The project folder can be named based on the user's current project title, but
this example will use `projects` as the project folder.
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 $env:USERPROFILE\projects
```
Next, create a new source file in the `projects`
folder and call it `hello-world.js`.
In Node.js it is considered good style to use
hyphens (`-`) or underscores (`_`) to separate
multiple words in filenames.
Open `hello-world.js` in any preferred text editor and
paste in the following content:
```js
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello, World!\n');
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
```
Save the file, go back to the terminal window enter the following command:
```console
$ node hello-world.js
```
An output like this should appear in the terminal to indicate Node.js
server is running:
```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.
Many of the examples in the documentation can be run similarly.
[Command Line Options]: cli.html#cli_command_line_options
[this guide]: https://nodejs.org/en/download/package-manager/
[web server]: http.html
|
