How to Set Up Clerk Authentication with Expo Router

Setting up authentication in a React Native app using Expo Router involves integrating the @clerk/expo SDK, which provides a comprehensive system for managing authentication flows, including multi-factor authentication (MFA) and social logins like Google and Apple. The process requires setting up a Clerk account, installing necessary packages, and configuring your project with ClerkProvider, useAuth(), and layout routes to manage authenticated and unauthenticated paths. Clerk's system ensures secure token storage via platform-specific secure storage solutions like iOS Keychain Services and Android Keystore, and it supports customization through various integration tiers, including JS custom UI and native components. The use of route groups in Expo Router allows for automatic routing and authentication checks, with Clerk handling token refresh and session management seamlessly. Additionally, Clerk supports various MFA strategies and offers prebuilt UI components for streamlined integration, though it requires a development build for full functionality, including native OAuth flows.