React vs Angular: Key Differences and When to Use Each

React is a flexible JavaScript library focused on building UI components with a virtual DOM, while Angular is a full-featured framework offering a complete solution including routing and state management. React uses functional components and hooks, whereas Angular uses TypeScript and a component-based architecture with templates.

Quick Comparison

Here is a quick side-by-side comparison of React and Angular on key factors.

Factor	React	Angular
Type	Library focused on UI	Full-featured framework
Language	JavaScript/TypeScript (optional)	TypeScript (default)
Architecture	Component-based with virtual DOM	Component-based with real DOM
Learning Curve	Gentle, flexible	Steeper, opinionated
Data Binding	One-way binding	Two-way binding
State Management	External libraries (e.g., Redux)	Built-in services and RxJS

Key Differences

React is a UI library that focuses on building reusable components using a virtual DOM for efficient updates. It encourages using functional components with hooks for managing state and side effects. React leaves routing, state management, and other features to external libraries, giving developers flexibility to choose tools.

Angular is a complete framework built with TypeScript that provides a structured way to build applications. It includes built-in routing, form handling, HTTP client, and RxJS for reactive programming. Angular uses real DOM and two-way data binding, which simplifies syncing UI and data but can affect performance in large apps.

React’s flexibility suits projects where you want to pick your own tools and libraries, while Angular’s all-in-one approach is great for teams wanting a consistent, opinionated structure out of the box.

Code Comparison

Here is how you create a simple counter component that increments a number on button click in React.

javascript

import React, { useState } from 'react';

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

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>Increment</button>
    </div>
  );
}

Output

A webpage showing "Count: 0" and a button labeled "Increment" that increases the count when clicked.

Angular Equivalent

Here is the Angular version of the same counter component using TypeScript and templates.

typescript

import { Component } from '@angular/core';

@Component({
  selector: 'app-counter',
  template: `
    <div>
      <p>Count: {{ count }}</p>
      <button (click)="increment()">Increment</button>
    </div>
  `
})
export class CounterComponent {
  count = 0;

  increment() {
    this.count++;
  }
}

Output

A webpage showing "Count: 0" and a button labeled "Increment" that increases the count when clicked.

When to Use Which

Choose React when you want a lightweight, flexible UI library that lets you pick your own tools and scale gradually. It’s ideal for projects needing fast rendering and a gentle learning curve.

Choose Angular when you want a full-featured, opinionated framework with built-in solutions for routing, forms, and state management. It suits large teams and enterprise apps that benefit from a consistent structure and TypeScript’s strict typing.

Key Takeaways

React is a flexible UI library using virtual DOM and hooks for state management.

Angular is a full framework with built-in features and uses TypeScript and real DOM.

React suits projects needing customization and a gentle learning curve.

Angular fits large, structured apps requiring a complete solution out of the box.

Both can build interactive UIs but differ in architecture and ecosystem approach.