React Native vs React.js: What Actually Changes When You Start Coding?

Many developers assume React Native is just “React for mobile.” While the concepts stay the same, the coding experience changes a lot.If you’re moving from React.js (web) to React Native (mobile), here’s exactly what changes when you write code ,

1. Components: HTML vs Native Components

React.js (Web)

You write familiar HTML elements:

<div>
  <h1>Hello World</h1>
  <button>Click Me</button>
</div>        

React Native (Mobile)

There is NO HTML. You use native components:

<View>
  <Text>Hello World</Text>
  <TouchableOpacity>
    <Text>Click Me</Text>
  </TouchableOpacity>
</View>
        

Key Change:

• div → View
• p / h1 / span → Text
• button → TouchableOpacity / Pressable

You must think in mobile UI blocks, not web tags.

2 . Styling: CSS vs JavaScript Stylesheets

React.js

Uses CSS files, SCSS, Tailwind, or inline styles:

.container {
  padding: 20px;
}
        

React Native

Styles are written in JavaScript objects:

const styles = StyleSheet.create({
  container: {
    padding: 20,
  },
});
        

Key Differences:

• No CSS files
• No px, em, %
• Uses Flexbox by default
• Style values are numbers, not strings

Styling feels stricter but more predictable.

3. Layout System: Mobile-First Thinking

React.js

• Layouts are screen-width based
• Media queries for responsiveness

React Native

• Layout adapts to many device sizes
• Uses:
• Dimensions
• SafeAreaView
• ScrollView

You must consider:

• Screen height
• Notches
• Touch areas
• Orientation changes

Mobile layout thinking is very different from web.

4. Navigation: Routing vs Stack Navigation

React.js

Uses routing libraries:

react-router-dom
        

React Native

Uses navigation stacks:

@react-navigation/native
        

Types of navigation:

• Stack navigation
• Tab navigation
• Drawer navigation

Key Change:

• No URLs
• No browser history
• Navigation feels like real mobile apps

5. Events: Click vs Touch

React.js

<button onClick={handleClick} />
        

React Native

<TouchableOpacity onPress={handlePress} />        

Key Differences:

• onClick → onPress
• Touch handling includes:

Mobile apps depend heavily on touch interactions.

6. Platform APIs: Browser vs Device Features

React.js

Uses browser APIs:

• window
• document
• localStorage

React Native

Uses device APIs:

• Camera
• GPS
• Fingerprint
• Push notifications

import { Platform } from 'react-native';
        

You must handle:

• Android vs iOS differences
• Permissions
• Native behaviors

7. Assets: Web Images vs Mobile Assets

React.js

<img src="/logo.png" />
        

React Native

<Image source={require('./logo.png')} />
        

Key Change:

• Images are bundled differently
• Sizes must be optimized for performance

8. Debugging & Tools

React.js

• Chrome DevTools
• Browser console

React Native

• Metro bundler
• Android Studio / Xcode
• React Native Debugger
• Flipper

Debugging feels closer to native development.

9. Performance Considerations

React Native apps:

• Run on real devices
• Need optimized renders
• Require efficient lists (FlatList)

<FlatList data={data} renderItem={renderItem} />
        

Performance mistakes are more visible on mobile than web.

What Stays the Same?

Despite all the differences, these remain identical:

• Components
• Hooks (useState, useEffect)
• Props & state
• JavaScript logic
• API calls

This is why React.js developers learn React Native faster.

Final Thoughts

React Native is not harder than React.js— It just requires a shift in thinking.

From:

“How does this look in a browser?”

To:

“How does this feel on a real device?”

If you understand React fundamentals, React Native is a powerful next step.

Your Turn

If you are learning React Native now:

• What part feels most different from React.js?

Let’s discuss

Author: Devindi | React Native Learner & Frontend Developer