{"id":52087,"date":"2026-04-24T01:00:00","date_gmt":"2026-04-24T08:00:00","guid":{"rendered":"https:\/\/www.uxpin.com\/studio\/?p=52087"},"modified":"2026-04-24T03:06:38","modified_gmt":"2026-04-24T10:06:38","slug":"how-react-works","status":"publish","type":"post","link":"https:\/\/www.uxpin.com\/studio\/blog\/how-react-works\/","title":{"rendered":"How Does React Work? Components, Virtual DOM &#038; Rendering Explained (2026)"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/www.uxpin.com\/studio\/wp-content\/uploads\/2024\/02\/How-does-React-work-1024x512.png\" alt=\"How React works - diagram showing components, virtual DOM, and rendering\" class=\"wp-image-52088\" srcset=\"https:\/\/www.uxpin.com\/studio\/wp-content\/uploads\/2024\/02\/How-does-React-work-1024x512.png 1024w, https:\/\/www.uxpin.com\/studio\/wp-content\/uploads\/2024\/02\/How-does-React-work-600x300.png 600w, https:\/\/www.uxpin.com\/studio\/wp-content\/uploads\/2024\/02\/How-does-React-work-768x384.png 768w, https:\/\/www.uxpin.com\/studio\/wp-content\/uploads\/2024\/02\/How-does-React-work.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<p><strong>React works by breaking your UI into reusable components, tracking state changes, and efficiently updating only the parts of the DOM that need to change using a virtual DOM.<\/strong> Instead of reloading an entire page when data changes, React calculates the minimum number of updates needed and applies them \u2014 making applications fast and responsive.<\/p>\n<p>This guide explains the core mechanics of React: components, JSX, the virtual DOM, state and props, hooks, and the rendering lifecycle. Whether you&#8217;re evaluating React for a project or learning it for the first time, you&#8217;ll understand exactly how it works under the hood.<\/p>\n<p>Want to build React UIs without writing code from scratch? <a href=\"https:\/\/www.uxpin.com\/merge\" target=\"_blank\" rel=\"noreferrer noopener\">UXPin Merge<\/a> lets you drag and drop real React components from production libraries like <a href=\"https:\/\/www.uxpin.com\/merge\/mui-library\" target=\"_blank\" rel=\"noreferrer noopener\">MUI<\/a>, <a href=\"https:\/\/www.uxpin.com\/studio\/blog\/integrate-with-ant-design-npm\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ant Design<\/a>, and <a href=\"https:\/\/www.uxpin.com\/bootstrap-ui-kit\" target=\"_blank\" rel=\"noreferrer noopener\">Bootstrap<\/a> \u2014 then export clean JSX. <a href=\"https:\/\/www.uxpin.com\/sign-up\" target=\"_blank\" rel=\"noreferrer noopener\">Try it free<\/a>.<\/p>\n<h2 id=\"h-what-is-react\">What Is React?<\/h2>\n<p><a href=\"https:\/\/www.uxpin.com\/studio\/blog\/what-is-react\/\" target=\"_blank\" rel=\"noreferrer noopener\">React<\/a> (also called React.js or ReactJS) is an open-source JavaScript library for building user interfaces. Created by Meta (Facebook) in 2013, it is now maintained by Meta engineers and a large open-source community.<\/p>\n<p>React is used by companies of all sizes to build <a href=\"https:\/\/www.uxpin.com\/studio\/blog\/react-web-apps\/\" target=\"_blank\" rel=\"noreferrer noopener\">web applications like PayPal and Netflix<\/a>, mobile apps (via React Native), and complex enterprise tools. It&#8217;s the most popular frontend library, with millions of weekly npm downloads.<\/p>\n<p>React is not a full framework like Angular. It focuses on the view layer only, giving you the freedom to choose your own routing, state management, and backend solutions.<\/p>\n<h2 id=\"h-core-concepts\">Core Concepts: How React Works Step by Step<\/h2>\n<h3 id=\"h-components\">1. Components \u2014 The Building Blocks<\/h3>\n<p>Everything in a React application is a component. A component is a self-contained piece of UI that accepts inputs (called props) and returns JSX describing what should appear on screen.<\/p>\n<p>There are two types of components:<\/p>\n<ul>\n<li><strong>Functional components<\/strong> (modern standard) \u2014 JavaScript functions that return JSX. They use hooks for state and side effects.<\/li>\n<li><strong>Class components<\/strong> (legacy) \u2014 ES6 classes that extend <code>React.Component<\/code>. Still supported but rarely used in new code.<\/li>\n<\/ul>\n<pre><code>function WelcomeMessage({ name }) {\n  return &lt;h1&gt;Hello, {name}!&lt;\/h1&gt;;\n}<\/code><\/pre>\n<p>Components can be nested, composed, and reused throughout your application. A page might consist of a <code>Header<\/code>, <code>Sidebar<\/code>, <code>MainContent<\/code>, and <code>Footer<\/code> component, each managing its own logic and rendering.<\/p>\n<h3 id=\"h-jsx\">2. JSX \u2014 Writing UI in JavaScript<\/h3>\n<p>JSX (JavaScript XML) is a syntax extension that lets you write HTML-like markup directly in JavaScript. It makes component templates readable and expressive:<\/p>\n<pre><code>function App() {\n  return (\n    &lt;div&gt;\n      &lt;Header \/&gt;\n      &lt;MainContent \/&gt;\n      &lt;Footer \/&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n<p>JSX is not HTML. It gets compiled to <code>React.createElement()<\/code> calls by your build tool (Vite, webpack). This compilation step is why you need Node.js in your development environment.<\/p>\n<h3 id=\"h-props-state\">3. Props and State \u2014 Managing Data<\/h3>\n<p>React components use two types of data:<\/p>\n<ul>\n<li><strong>Props<\/strong> (properties) \u2014 read-only data passed from parent to child components. Think of them as function arguments. A parent might pass <code>title=\"Dashboard\"<\/code> to a <code>PageHeader<\/code> component.<\/li>\n<li><strong>State<\/strong> \u2014 mutable data owned by a component. When state changes, React re-renders that component and its children. State is managed with the <code>useState<\/code> hook in functional components.<\/li>\n<\/ul>\n<pre><code>function Counter() {\n  const [count, setCount] = useState(0);\n  return (\n    &lt;button onClick={() =&gt; setCount(count + 1)}&gt;\n      Clicked {count} times\n    &lt;\/button&gt;\n  );\n}<\/code><\/pre>\n<p>Data flows one way in React: from parent to child through props. This unidirectional data flow makes applications predictable and easier to debug.<\/p>\n<h3 id=\"h-virtual-dom\">4. Virtual DOM \u2014 Efficient Rendering<\/h3>\n<p>The virtual DOM is React&#8217;s performance secret. Here&#8217;s how it works:<\/p>\n<ol>\n<li><strong>Render<\/strong> \u2014 when state or props change, React creates a new virtual DOM tree (a lightweight JavaScript object representing the UI).<\/li>\n<li><strong>Diff<\/strong> \u2014 React compares the new virtual DOM with the previous one using a diffing algorithm (called &#8220;reconciliation&#8221;).<\/li>\n<li><strong>Patch<\/strong> \u2014 only the elements that actually changed are updated in the real DOM.<\/li>\n<\/ol>\n<p>This process is fast because manipulating JavaScript objects in memory is much cheaper than touching the real DOM. Instead of rebuilding the entire page, React surgically updates only what changed.<\/p>\n<h3 id=\"h-hooks\">5. Hooks \u2014 Adding Logic to Functional Components<\/h3>\n<p>Hooks (introduced in React 16.8) let functional components manage state and side effects without class syntax. The most commonly used hooks are:<\/p>\n<ul>\n<li><strong><code>useState<\/code><\/strong> \u2014 adds local state to a component.<\/li>\n<li><strong><code>useEffect<\/code><\/strong> \u2014 runs side effects (API calls, subscriptions, timers) after rendering.<\/li>\n<li><strong><code>useContext<\/code><\/strong> \u2014 accesses shared data without passing props through every level.<\/li>\n<li><strong><code>useRef<\/code><\/strong> \u2014 holds a mutable reference that persists across renders.<\/li>\n<li><strong><code>useMemo<\/code> \/ <code>useCallback<\/code><\/strong> \u2014 optimize performance by memoizing values or functions.<\/li>\n<\/ul>\n<p>Custom hooks let you extract and share stateful logic between components, promoting cleaner, more modular code.<\/p>\n<h3 id=\"h-lifecycle\">6. Component Lifecycle and Rendering<\/h3>\n<p>Every React component goes through a lifecycle:<\/p>\n<ul>\n<li><strong>Mounting<\/strong> \u2014 the component is created and inserted into the DOM. (<code>useEffect<\/code> with an empty dependency array runs here.)<\/li>\n<li><strong>Updating<\/strong> \u2014 the component re-renders when its state or props change.<\/li>\n<li><strong>Unmounting<\/strong> \u2014 the component is removed from the DOM. (Cleanup functions in <code>useEffect<\/code> run here.)<\/li>\n<\/ul>\n<p>React 18+ introduces concurrent rendering features like <code>startTransition<\/code> and <code>Suspense<\/code>, which allow React to prepare updates in the background without blocking the UI \u2014 making complex applications feel smoother.<\/p>\n<h2 id=\"h-what-is-react-compared-with\">What Is React Compared With?<\/h2>\n<p>React is often evaluated alongside:<\/p>\n<ul>\n<li><strong>Angular<\/strong> \u2014 a full framework with opinionated structure, built-in routing, and dependency injection. Better for teams that want everything included; React is more flexible.<\/li>\n<li><strong>Vue.js<\/strong> \u2014 a progressive framework with a gentle learning curve. Vue and React share similar component-based approaches, but Vue provides more built-in opinions.<\/li>\n<li><strong>Svelte<\/strong> \u2014 compiles components at build time instead of using a virtual DOM at runtime, resulting in smaller bundles. A newer approach gaining popularity.<\/li>\n<\/ul>\n<p>React&#8217;s combination of ecosystem size, corporate backing, and community support keeps it as the most widely adopted choice for frontend development.<\/p>\n<h2 id=\"h-what-can-you-build\">What Can You Build With React?<\/h2>\n<p>React is versatile enough for virtually any UI-heavy application:<\/p>\n<ul>\n<li><strong>Single-page applications<\/strong> \u2014 social media platforms, project management tools, CRMs<\/li>\n<li><strong>eCommerce storefronts<\/strong> \u2014 dynamic product listings, shopping carts, checkout flows<\/li>\n<li><strong>Data dashboards<\/strong> \u2014 real-time analytics, monitoring systems, <a href=\"https:\/\/www.uxpin.com\/studio\/blog\/dashboard-vs-data-report-design\/\" target=\"_blank\" rel=\"noreferrer noopener\">business intelligence tools<\/a><\/li>\n<li><strong>Mobile applications<\/strong> \u2014 via React Native for <a href=\"https:\/\/www.uxpin.com\/studio\/blog\/ios-vs-andoid-ui-design-for-mobile\/\" target=\"_blank\" rel=\"noreferrer noopener\">iOS and Android<\/a><\/li>\n<li><strong>Design system component libraries<\/strong> \u2014 React is the foundation of most enterprise <a href=\"https:\/\/www.uxpin.com\/studio\/blog\/react-design-system\/\" target=\"_blank\" rel=\"noreferrer noopener\">design systems<\/a><\/li>\n<\/ul>\n<h2 id=\"h-getting-started\">Getting Started With React in 2026<\/h2>\n<p>The recommended way to start a new React project in 2026 is with a framework:<\/p>\n<ul>\n<li><strong>Next.js<\/strong> \u2014 the most popular React framework, with server-side rendering, file-based routing, and API routes built in.<\/li>\n<li><strong>Vite + React<\/strong> \u2014 a fast, lightweight setup for client-side React apps. Run <code>npm create vite@latest my-app -- --template react<\/code>.<\/li>\n<li><strong>Remix<\/strong> \u2014 a full-stack React framework focused on web standards and progressive enhancement.<\/li>\n<\/ul>\n<p><strong>Note:<\/strong> <code>create-react-app<\/code> is no longer recommended by the React team. Use Vite or a framework instead.<\/p>\n<p>For more detailed setup instructions, see our guide on <a href=\"https:\/\/www.uxpin.com\/studio\/blog\/how-to-run-react-app-loacally\/\" target=\"_blank\" rel=\"noreferrer noopener\">how to run a React app locally<\/a>.<\/p>\n<h2 id=\"h-build-react-ui-uxpin\">Build React Interfaces Visually With UXPin<\/h2>\n<p>Understanding how React works opens the door to building better applications \u2014 and better design-to-development workflows.<\/p>\n<p><a href=\"https:\/\/www.uxpin.com\/merge\" target=\"_blank\" rel=\"noreferrer noopener\">UXPin Merge<\/a> bridges the gap between design and code by letting teams design with real, interactive React components. Choose from built-in libraries like <a href=\"https:\/\/www.uxpin.com\/merge\/mui-library\" target=\"_blank\" rel=\"noreferrer noopener\">MUI<\/a> and <a href=\"https:\/\/www.uxpin.com\/bootstrap-ui-kit\" target=\"_blank\" rel=\"noreferrer noopener\">Bootstrap<\/a>, or <a href=\"https:\/\/www.uxpin.com\/merge\/git-integration\" target=\"_blank\" rel=\"noreferrer noopener\">sync your own component library via Git<\/a>. Every component is fully functional \u2014 with real states, props, and interactions \u2014 so prototypes behave exactly like the final product.<\/p>\n<p>With <a href=\"https:\/\/www.uxpin.com\/forge\" target=\"_blank\" rel=\"noreferrer noopener\">UXPin Forge<\/a>, you can also generate React interfaces using AI. Describe what you need, and Forge builds it using your actual production components \u2014 not generic placeholders. The output is clean JSX you can export and ship.<\/p>\n<p><a href=\"https:\/\/www.uxpin.com\/sign-up\" target=\"_blank\" rel=\"noreferrer noopener\">Start your free UXPin trial<\/a> and build your first React interface today.<\/p>\n<h2 id=\"h-faq\">Frequently Asked Questions<\/h2>\n<h3>How does React&#8217;s virtual DOM work?<\/h3>\n<p>When state or props change, React creates a new virtual DOM tree in memory, compares it with the previous one (a process called reconciliation), and then updates only the real DOM elements that changed. This makes rendering efficient because direct DOM manipulation is minimized.<\/p>\n<h3>Is React a framework or a library?<\/h3>\n<p>React is a library, not a framework. It focuses specifically on the view layer \u2014 rendering UI components and managing their state. You choose your own tools for routing, state management, and API communication. Frameworks like Next.js and Remix build on top of React to provide a more complete solution.<\/p>\n<h3>What is JSX in React?<\/h3>\n<p>JSX is a syntax extension for JavaScript that lets you write HTML-like markup inside your JavaScript files. It compiles to regular JavaScript function calls (React.createElement) during the build step. JSX makes it easier to visualize your component structure and is used by virtually all React projects.<\/p>\n<h3>What is the difference between state and props in React?<\/h3>\n<p>Props are read-only data passed from a parent component to a child component, similar to function arguments. State is mutable data that belongs to a specific component and can change over time, triggering re-renders. Props flow down; state is local.<\/p>\n<h3>Is create-react-app still recommended?<\/h3>\n<p>No. As of 2025, the React team no longer recommends create-react-app for new projects. The recommended alternatives are frameworks like Next.js or Remix, or a lightweight setup with Vite. These provide better performance, faster builds, and more modern defaults.<\/p>\n<h3>What are React hooks?<\/h3>\n<p>Hooks are functions that let you &#8220;hook into&#8221; React&#8217;s state and lifecycle features from functional components. The most common hooks are useState (for local state), useEffect (for side effects like API calls), and useContext (for shared data). They replaced the need for class components in most cases.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Article\",\n      \"headline\": \"How Does React Work? 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