Universal React apps for iOS, Android, and Web help developers quickly reach everywhere their users are, but getting navigation just right on all platforms has historically been a challenge without splitting your codebase. Web routing is powerful, expressive, and easy to set up, while mobile routing takes a fair amount of manual tuning. Enter Expo Router, the first file system-based router for universal React apps. Your folder structure now represents your app navigation tree and each file becomes a page simply by exporting a React component. Next.js-style dynamic routes let you pattern match multiple routes to a single page, creating expressive nested URL’s that also automatically work as deep links on mobile. Let's walk through how to get started with Expo Router and build apps that work great on mobile and web, without compromises.