React vs Angular: Key Differences and When to Use Each

React is a lightweight 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 JSX and hooks for state, whereas Angular uses TypeScript and a declarative template syntax.

Quick Comparison

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

Factor	React	Angular
Type	UI library	Full framework
Language	JavaScript with JSX	TypeScript
Data Binding	One-way binding	Two-way binding
DOM	Virtual DOM	Real DOM with change detection
Learning Curve	Gentle, flexible	Steeper, opinionated
State Management	External libraries (e.g., Redux)	Built-in services and RxJS

Key Differences

React focuses on building reusable UI components using JSX, which mixes HTML-like syntax with JavaScript. It uses a virtual DOM to efficiently update only parts of the page that change. React relies on external libraries for routing and state management, giving developers flexibility to choose tools.

Angular is a full framework that provides everything out of the box, including routing, forms, HTTP client, and state management with RxJS. It uses TypeScript and a declarative template syntax with two-way data binding, which automatically syncs data between the model and the view. Angular’s change detection runs on the real DOM, which can be more complex but offers powerful features.

React’s learning curve is gentler because it focuses on UI only, while Angular’s steeper curve comes from its many built-in features and strict structure. React’s flexibility suits projects that want to pick and choose tools, whereas Angular suits larger apps needing a complete, opinionated solution.

Code Comparison

Here is how you create a simple counter component in React using hooks.

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

Count: 0 (button increments count on click)

Angular Equivalent

This is the Angular version of the same counter component using TypeScript and template syntax.

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

Count: 0 (button increments count on click)

When to Use Which

Choose React when you want a flexible, lightweight library focused on UI with a gentle learning curve and the freedom to pick your own tools. It’s great for projects that need fast rendering and simple component-based design.

Choose Angular when you want a full-featured, opinionated framework with built-in solutions for routing, forms, and state management. It suits large-scale applications where a consistent structure and powerful features like two-way binding and dependency injection are important.

Key Takeaways

React is a UI library using JSX and virtual DOM, Angular is a full framework using TypeScript and real DOM.

React uses one-way data binding and external tools, Angular uses two-way binding and built-in features.

React has a gentler learning curve and more flexibility, Angular is more opinionated and feature-rich.

Use React for flexible, component-focused projects; use Angular for large, structured applications.