---
id: getting-started
title: Getting Started
layout: docs
next: tutorial.html
---
## JSFiddle
The easiest way to start hacking on React is using the following JSFiddle Hello World examples:
* **[React JSFiddle](http://jsfiddle.net/vjeux/kb3gN/)**
* [React JSFiddle without JSX](http://jsfiddle.net/vjeux/VkebS/)
## Starter Kit
Download the starter kit to get started.
<div class="buttons-unit downloads">
<a href="/react/downloads/react-{{site.react_version}}.zip" class="button">
Download Starter Kit {{site.react_version}}
</a>
</div>
In the root directory of the starter kit, create a `helloworld.html` with the following contents.
```html
<!DOCTYPE html>
<html>
<head>
<script src="build/react.js"></script>
<script src="build/JSXTransformer.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/jsx">
/** @jsx React.DOM */
React.renderComponent(
<h1>Hello, world!</h1>,
document.getElementById('example')
);
</script>
</body>
</html>
```
The XML syntax inside of JavaScript is called JSX; check out the [JSX syntax](/react/docs/jsx-in-depth.html) to learn more about it. In order to translate it to vanilla JavaScript we use `<script type="text/jsx">` and include `JSXTransformer.js` to actually perform the transformation in the browser.
### Separate File
Your React JSX code can live in a separate file. Create the following `src/helloworld.js`.
```javascript
/** @jsx React.DOM */
React.renderComponent(
<h1>Hello, world!</h1>,
document.getElementById('example')
);
```
Then reference it from `helloworld.html`:
```html{10}
<script type="text/jsx" src="src/helloworld.js"></script>
```
### Offline Transform
First install the command-line tools (requires [npm](http://npmjs.org/)):
```
npm install -g react-tools
```
Then, translate your `src/helloworld.js` file to plain JavaScript:
```
jsx --watch src/ build/
```
The file `build/helloworld.js` is autogenerated whenever you make a change.
```javascript{3}
/** @jsx React.DOM */
React.renderComponent(
React.DOM.h1(null, 'Hello, world!'),
document.getElementById('example')
);
```
> Note:
>
> The comment parser is very strict right now; in order for it to pick up the `@jsx` modifier, two conditions are required. The `@jsx` comment block must be the first comment on the file. The comment must start with `/**` (`/*` and `//` will not work). If the parser can't find the `@jsx` comment, it will output the file without transforming it.
Update your HTML file as below:
```html{6,10}
<!DOCTYPE html>
<html>
<head>
<title>Hello React!</title>
<script src="build/react.js"></script>
<!-- No need for JSXTransformer! -->
</head>
<body>
<div id="example"></div>
<script src="build/helloworld.js"></script>
</body>
</html>
```
## Want CommonJS?
If you want to use React with [browserify](http://browserify.org/), [webpack](http://webpack.github.io/), or another CommonJS-compatible module system, just use the [`react` npm package](https://www.npmjs.org/package/react). In addition, the `jsx` build tool can be integrated into most packaging systems (not just CommonJS) quite easily.
## Next Steps
Check out [the tutorial](/react/docs/tutorial.html) and the other examples in the starter kit's `examples` directory to learn more. Good luck, and welcome!