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<!DOCTYPE html>
<!--[if IE]><![endif]-->
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Why React? | React</title>
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<meta property="og:description" content="A JavaScript library for building user interfaces">
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React
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<h3>Flux</h3>
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<a href="/react/tips/maximum-number-of-jsx-root-nodes.html">Maximum Number of JSX Root Nodes</a>
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<a href="/react/tips/style-props-value-px.html">Shorthand for Specifying Pixel Values in style props</a>
</li>
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<a href="/react/tips/children-props-type.html">Type of the Children props</a>
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<a href="/react/tips/controlled-input-null-value.html">Value of null for Controlled Input</a>
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<a href="/react/tips/props-in-getInitialState-as-anti-pattern.html">Props in getInitialState Is an Anti-Pattern</a>
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<div class="inner-content">
<h1>
Why React?
<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/01-why-react.md" target="_blank">Edit on GitHub</a>
</h1>
<div class="subHeader"></div>
<p>React is a JavaScript library for creating user interfaces by Facebook and Instagram. Many people choose to think of React as the <strong>V</strong> in <strong><a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller">MVC</a></strong>.</p>
<p>We built React to solve one problem: <strong>building large applications with data that changes over time</strong>. To do this, React uses two main ideas.</p>
<h3><a class="anchor" name="simple"></a>Simple <a class="hash-link" href="#simple">#</a></h3>
<p>Simply express how your app should look at any given point in time, and React will automatically manage all UI updates when your underlying data changes.</p>
<h3><a class="anchor" name="declarative"></a>Declarative <a class="hash-link" href="#declarative">#</a></h3>
<p>When the data changes, React conceptually hits the "refresh" button, and knows to only update the changed parts.</p>
<h2><a class="anchor" name="build-composable-components"></a>Build Composable Components <a class="hash-link" href="#build-composable-components">#</a></h2>
<p>React is all about building reusable components. In fact, with React the <em>only</em> thing you do is build components. Since they're so encapsulated, components make code reuse, testing, and separation of concerns easy.</p>
<h2><a class="anchor" name="give-it-five-minutes"></a>Give It Five Minutes <a class="hash-link" href="#give-it-five-minutes">#</a></h2>
<p>React challenges a lot of conventional wisdom, and at first glance some of the ideas may seem crazy. <a href="http://37signals.com/svn/posts/3124-give-it-five-minutes">Give it five minutes</a> while reading this guide; those crazy ideas have worked for building thousands of components both inside and outside of Facebook and Instagram.</p>
<h2><a class="anchor" name="learn-more"></a>Learn More <a class="hash-link" href="#learn-more">#</a></h2>
<p>You can learn more about our motivations behind building React in <a href="http://facebook.github.io/react/blog/2013/06/05/why-react.html">this blog post</a>.</p>
<div class="docs-prevnext">
<a class="docs-next" href="/react/docs/displaying-data.html">Next →</a>
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A Facebook & Instagram collaboration.<br>
<a href="/react/acknowledgements.html">Acknowledgements</a>
</div>
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© 2013–2014 Facebook Inc.<br>
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