Expo is the fastest way to start building React Native apps without installing Xcode or Android Studio. It is ideal for rapid prototyping, testing, and even launching full-scale production apps. With Expo, developers can focus on creating features while the platform handles the native complexity under the hood. Its ecosystem includes built-in APIs such as Camera, push notifications, geolocation, and sensors, providing a robust starting point for any app.
Why Expo?
Expo brings several advantages
- Instant setup: No need to install native build tools like Xcode or Android Studio.
- Cross-platform: Supports iOS, Android, and Web out of the box.
- Built-in APIs: Access to device hardware features without writing native code.
- Over-the-air updates: Push updates to your app without resubmitting to app stores.
- Rich community and documentation: Plenty of resources to help you get started quickly.
Prerequisites
Before starting, ensure Node.js and npm are installed. Familiarity with JavaScript or TypeScript is recommended
Setting Up
Create a new project
Expo dropped the old global expo-cli in favor of create-expo-app, so there's nothing to install upfront, npx pulls the latest version each time:
npx create-expo-app my-app
You'll be prompted to pick a template: a blank TypeScript app, or one with tab navigation already wired up.
Run the local dev server
cd my-app
npx expo start
Scan the QR code with the Expo Go app on iOS or Android to preview it on a physical device, or press i / a in the terminal to launch an iOS Simulator or Android Emulator directly.
Folder Structure
A clean project structure helps maintainability and scalability
my-app/
├── App.js
├── assets/
├── components/
├── screens/
└── navigation/
App.js: Main entry point
assets/: Images, fonts, and other media
components/: Reusable UI components
screens/: Page-level components
navigation/: Navigation setup (React Navigation or other)
Using Components
Create reusable UI components
import { Pressable, Text } from "react-native";
export default function Button({ label, onPress }) {
return (
<Pressable onPress={onPress}>
<Text>{label}</Text>
</Pressable>
);
}
Deployment
Build your app for production using Expo Application Services
eas build --platform all
Submit the built app to the App Store or Play Store
eas submit --platform ios