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PR-URL: https://github.com/nodejs/node/pull/40403 Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Zijian Liu <lxxyxzj@gmail.com> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
94 lines
2.1 KiB
Markdown
94 lines
2.1 KiB
Markdown
# Usage and example
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## Usage
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<!--introduced_in=v0.10.0-->
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<!--type=misc-->
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`node [options] [V8 options] [script.js | -e "script" | - ] [arguments]`
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Please see the [Command-line options][] document for more information.
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## Example
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An example of a [web server][] written with Node.js which responds with
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`'Hello, World!'`:
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Commands in this document start with `$` or `>` to replicate how they would
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appear in a user's terminal. Do not include the `$` and `>` characters. They are
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there to show the start of each command.
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Lines that don’t start with `$` or `>` character show the output of the previous
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command.
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First, make sure to have downloaded and installed Node.js. See
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[Installing Node.js via package manager][] for further install information.
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Now, create an empty project folder called `projects`, then navigate into it.
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Linux and Mac:
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```console
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$ mkdir ~/projects
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$ cd ~/projects
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```
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Windows CMD:
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```console
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> mkdir %USERPROFILE%\projects
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> cd %USERPROFILE%\projects
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```
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Windows PowerShell:
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```console
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> mkdir $env:USERPROFILE\projects
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> cd $env:USERPROFILE\projects
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```
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Next, create a new source file in the `projects`
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folder and call it `hello-world.js`.
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Open `hello-world.js` in any preferred text editor and
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paste in the following content:
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```js
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const http = require('http');
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const hostname = '127.0.0.1';
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const port = 3000;
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const server = http.createServer((req, res) => {
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res.statusCode = 200;
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res.setHeader('Content-Type', 'text/plain');
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res.end('Hello, World!\n');
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});
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server.listen(port, hostname, () => {
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console.log(`Server running at http://${hostname}:${port}/`);
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});
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```
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Save the file, go back to the terminal window, and enter the following command:
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```console
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$ node hello-world.js
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```
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Output like this should appear in the terminal:
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```console
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Server running at http://127.0.0.1:3000/
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```
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Now, open any preferred web browser and visit `http://127.0.0.1:3000`.
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If the browser displays the string `Hello, World!`, that indicates
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the server is working.
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[Command-line options]: cli.md#command-line-options
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[Installing Node.js via package manager]: https://nodejs.org/en/download/package-manager/
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[web server]: http.md
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