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Getting Started

JSFiddle #

The easiest way to start hacking on React is using the following JSFiddle Hello World examples:

Starter Pack #

If you're just getting started, you can download the starter kit. The starter kit includes prebuilt copies of React and React DOM for the browser, as well as a collection of usage examples to help you get started.

In the root directory of the starter kit, create a helloworld.html with the following contents.

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>
    <script src="build/react.js"></script>
    <script src="build/react-dom.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
  </head>
  <body>
    <div id="example"></div>
    <script type="text/babel">
      ReactDOM.render(
        <h1>Hello, world!</h1>,
        document.getElementById('example')
      );
    </script>
  </body>
</html>

The XML syntax inside of JavaScript is called JSX; check out the JSX syntax to learn more about it. In order to translate it to vanilla JavaScript we use <script type="text/babel"> and include Babel to actually perform the transformation in the browser. Open the html from a browser and you should already be able to see the greeting!

Separate File #

Your React JSX code can live in a separate file. Create the following src/helloworld.js.

ReactDOM.render(
  <h1>Hello, world!</h1>,
  document.getElementById('example')
);

Then reference it from helloworld.html:

<script type="text/babel" src="src/helloworld.js"></script>

Note that some browsers (Chrome, e.g.) will fail to load the file unless it's served via HTTP.

Using React with npm or Bower #

You can also use React with package managers like npm or Bower. You can learn more in our Package Managers section.

Next Steps #

Check out the tutorial and the other examples in the starter kit's examples directory to learn more.

Good luck, and welcome!