react.dev/docs/getting-started.md

---
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 Worlds

 * **[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.min.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](syntax.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 file 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.getElementyById('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.min.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 within a module system, [fork our repo](http://github.com/facebook/react), `npm install` and run `grunt`. A nice set of CommonJS modules will be generated. Our `jsx` build tool can be integrated into most packaging systems (not just CommonJS) quite easily.

## Next Steps

Check out [the tutorial](tutorial.html) and the other examples in the `/examples` directory to learn more. Good luck, and welcome!
cleanup some files, move tutorial 12 years ago			`---`
put it all together 12 years ago			`id: getting-started`
cleanup some files, move tutorial 12 years ago			`title: Getting Started`
			`layout: docs`
			`next: tutorial.html`
			`---`

			`## JSFiddle`

			`The easiest way to start hacking on React is using the following JSFiddle Hello Worlds`

			`* [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.min.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](syntax.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 file 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.getElementyById('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.min.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 within a module system, [fork our repo](http://github.com/facebook/react), `npm install` and run `grunt`. A nice set of CommonJS modules will be generated. Our `jsx` build tool can be integrated into most packaging systems (not just CommonJS) quite easily.

			`## Next Steps`

			Check out [the tutorial](tutorial.html) and the other examples in the `/examples` directory to learn more. Good luck, and welcome!