Top 3 Reasons to Use React

Key Takeaways

• React separates rendering component output from committing DOM changes; a re-render doesn't necessarily change the DOM.
• Components support reusable UI, but state ownership and component boundaries still require deliberate design.
• Evaluate the complete stack: React, your application framework, and the libraries you'll maintain.
• Choose React, Angular, or Vue by project requirements—not an assumed performance or popularity advantage.

Why use React? Its three strongest arguments are declarative rendering, composable components, and a broad ecosystem. Those are useful reasons to shortlist React for an interactive web application, not proof that it beats Angular or Vue for every project.

1) The Virtual DOM: Declarative Updates, Not Guaranteed Speed

React lets you describe what the interface should look like for a given state instead of manually coordinating every change. The virtual DOM is an in-memory representation of UI output, not a complete clone of the DOM—the browser's document tree. React reconciles successive outputs to determine how to update the interface.

For browser updates, distinguish three kinds of work:

1. Render: React calls components to calculate their output.
2. Commit: React applies the resulting changes to the DOM.
3. Browser rendering: The browser performs any necessary layout and painting to display the result.

A component can render without any corresponding DOM mutation. Reconciliation also isn't a promise of the globally smallest edit sequence or a faster application than another framework. The benefit is an update model you can reason about, not automatic performance superiority.

Measure Before Optimizing

Start with a slow interaction you can reproduce using representative data. Use the Profiler in React Developer Tools to investigate component work, then examine scripting, layout, and painting in your browser's performance tools. Validate user-facing timings with a production build on representative devices.

Memoization can skip some rendering when props are unchanged, but it's an optimization, not a correctness guarantee. If your build enables React Compiler, it can apply memoization automatically, reducing the need for manual wrappers. Neither replaces measurement.

React also supports generating HTML on the server through React DOM's server APIs. Server rendering, client rendering, and static generation are architectural choices supported by the surrounding stack—not different names for virtual-DOM optimization.

2) Components: Reusable Pieces With Explicit Data Flow

React's compositional model resembles building with Lego blocks: small pieces combine into larger interfaces. A button can sit inside a product card, which sits inside a catalog. Composition gives you a way to organize and reuse UI; it doesn't guarantee maintainability without good boundaries.

Function components receive inputs called props and return UI descriptions, commonly written in JSX. State is optional. A Hook such as useState adds state when a component needs it; other components can simply display props.

Props, State, and Events in Practice

In an existing client-rendered React project, replace App.jsx with this example. If you need a project first, follow the React quick start.

// App.jsx in an existing client-rendered React project
import { useState } from 'react';

function IncrementButton({ count, onIncrement }) {
  return (
    <button type="button" onClick={onIncrement}>
      Add item ({count})
    </button>
  );
}

export default function App() {
  const [count, setCount] = useState(0);

  function handleIncrement() {
    setCount(current => current + 1);
  }

  return (
    <section>
      <h2>Cart</h2>
      <IncrementButton
        count={count}
        onIncrement={handleIncrement}
      />
      <p>Items: {count}</p>
    </section>
  );
}

App owns the count; IncrementButton owns no state. The child receives the current count and a callback through props. Clicking invokes that callback, and the functional state updater calculates the next count from the pending count.

App owns count
  | count + onIncrement props
  v
IncrementButton
  |
  +-- click invokes callback --> App updates count

This is one-way data flow: values travel down through props, and callbacks let children request updates. When siblings need the same state, you can lift its ownership to their closest common parent. Explicit update paths help you trace behavior, but the extra prop and callback wiring remains a design trade-off.

Component boundaries aren't automatic rendering boundaries. A state update normally renders the component and its descendants; a parent render can therefore involve children whose props haven't changed. Use measured optimizations rather than assuming each component is an isolated visual update region.

3) A Thriving Community: Useful Choices, Not Guarantees

The practical ecosystem argument is that you have different tools for different jobs:

• React provides the UI library and component model.
• Next.js is a React framework for web applications, adding capabilities such as routing, server rendering, and server-side request handling.
• React Native is a separate framework for Android and iOS applications using native components. It isn't a mobile feature of Next.js.

These are related projects with distinct responsibilities; React alone isn't a full-stack application framework.

Flexibility has a cost. Without an application framework, you must select and maintain solutions for routing, data fetching, build tooling, and shared conventions. React's documentation recommends starting new applications with a framework, while retaining from-scratch setups for requirements that warrant them.

React's stable releases follow semantic versioning. Still, evaluate the maintenance and compatibility of your entire dependency stack, assign upgrade ownership, and budget for testing. A recognizable project name isn't a substitute for that work.

React vs Angular vs Vue: Compare the Actual Stack

Compare equivalent application stacks, not React's core library against everything another framework provides.

These distinctions describe scope and integration choices, not a ranking of application size or performance. Angular and Vue aren't restricted to particular project sizes, and React isn't uniquely suited to complex interfaces.

Binding stereotypes aren't useful either. Vue props also flow one way, while Angular's two-way binding combines property and event binding. Two-way binding doesn't inherently make an application unpredictable; clear state ownership matters whichever tool you choose. For another comparison, see Vue vs React.

When to Use React: A Project Checklist

Build a representative screen before committing. Evaluate these requirements against your strongest alternatives:

• Team experience: Assess existing skills, onboarding effort, and hiring availability in your market.
• Existing code and integrations: Validate your design system, forms, authentication, charts, and backend contracts.
• Accessibility: Test keyboard navigation, focus management, labels, and error feedback in the actual components you'll ship.
• Performance: Set loading and interaction targets, then measure realistic data volumes and target devices.
• Deployment: Decide whether you need static hosting, request-time server execution, or a mixture; verify your framework's deployment requirements.
• Maintenance: Review dependency compatibility, security advisories, upgrade effort, and ownership. Include React component testing in that plan.

Conclusion

Choose React when its rendering model, component composition, and ecosystem match your project's needs—and your team can maintain the resulting stack. If Angular or Vue already fits better, there's no prize for switching. Consider the reasons not to use React before making the decision.

FAQ

What are the main advantages of React?

React offers declarative rendering, reusable components, and application-framework options. Its component model helps organize larger interfaces, but maintainability still depends on clear boundaries and state ownership.

When should you choose React over Angular or Vue?

Choose React when your team's experience, required integrations, and preferred application stack fit it better. The best choice depends on project requirements, including accessibility, performance, deployment, and long-term maintenance—not a universal framework ranking.

Does the React virtual DOM make an application faster?

Not automatically. React reconciles render output and commits DOM changes, but virtual DOM use alone doesn't establish a performance advantage; profile representative workloads instead.

Is React a library or a framework?

React is a UI library, not a complete application framework. Next.js builds on React for web application capabilities, while React Native is a separate framework for native mobile applications.

What are the trade-offs of using React?

React's flexibility means you must choose application conventions and supporting tools unless a framework supplies them. Those choices bring integration, compatibility, and maintenance responsibilities alongside the benefits of flexibility.

Further Reading

• React: Render and Commit — component execution versus DOM changes.
• React: Sharing State Between Components — state ownership and lifting state.
• React: Creating a React App — framework selection and alternatives.
• Next.js documentation — React-based web application capabilities.
• React Native: Core and Native Components — native UI rather than browser DOM.
• Angular overview — framework scope and first-party features.
• Vue introduction — progressive adoption and application options.
• The React Foundation announcement — the February 2026 ownership change.