Choosing a Routing Architecture for Expo: Expo Router vs. React Navigation

The Routing Decision: File-Based vs. Component-Based

When building an Expo application, the primary architectural decision regarding navigation is whether to use Expo Router or React Navigation. While Expo Router is actually built on top of React Navigation, it fundamentally changes how you define the application's map. The choice depends on whether you prioritize automatic URL mapping and developer velocity or granular, manual control over the navigation stack.

Comparison of Routing Approaches

Feature	Expo Router	React Navigation
Configuration	File-system based (/app directory)	Component-based (JSX definitions)
Deep Linking	Automatic based on file path	Manual mapping via linking object
Type Safety	Typed Routes (auto-generated)	Manual TypeScript interface definitions
Control	Opinionated structure	High granularity over stack behavior

Evaluating the Trade-offs

Expo Router is designed for applications that require a web-like URL structure and rapid iteration. Because it maps the /app directory to routes, adding a new screen is as simple as creating a new file. This eliminates the need to maintain a central navigation configuration file that grows linearly with the app's size. It is particularly effective for teams moving from Next.js or those requiring native deep linking without the overhead of manual configuration.

React Navigation remains the better choice for complex, non-linear navigation flows. If your app requires highly dynamic navigation stacks—where the route sequence changes based on complex state logic rather than a hierarchy—defining your navigators in JSX provides more transparency. However, this comes at the cost of manual deep link configuration, where every URL path must be explicitly mapped to a component in a linking configuration object.

Implementing Expo Router with Dynamic Paths

To implement a dynamic route (such as a user profile page) using Expo Router, you use bracket notation in the file system. This allows the application to capture parameters from the URL automatically.

Project Structure:/app
  /_layout.tsx (Root Layout)
  /index.tsx (Home Screen)
  /user/[id].tsx (Dynamic User Profile)

Implementation for /app/user/[id].tsx:

import { useLocalSearchParams } from 'expo-router';
import { Text, View } from 'react-native';

export default function UserProfile() {
  // Extract the 'id' parameter from the URL path
  const { id } = useLocalSearchParams();

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>User Profile ID: {id}</Text>
    </View>
  );
}

Validation and Testing

To verify that the routing is functioning correctly, you can test the deep linking capabilities directly from your terminal while the app is running in a simulator. This bypasses the need to build a custom linking scheme for testing.

Command (Run in terminal):

npx uri-scheme open exp://localhost:8081/user/123 --android

Expected Result: The application should boot (or foreground) and navigate directly to the UserProfile component, displaying "User Profile ID: 123".

Limitations and Constraints

• Directory Bloat: In very large applications, the /app directory can become cluttered. Use Route Groups (folders wrapped in parentheses, e.g., /(auth)) to organize files without affecting the URL path.
• SDK Versioning: Expo Router requires a modern Expo SDK version. Ensure your app.json is configured with the correct scheme to enable deep linking.
• Migration: Moving from React Navigation to Expo Router requires a physical relocation of components into the /app directory, which may necessitate changes to how you handle global state or context providers.