expo-router is a routing library designed specifically for React Native applications built with Expo. It simplifies navigation and routing by providing a file-based routing system, allowing developers to create and manage routes easily. With expo-router, you can define your app's navigation structure using a directory-based approach, which enhances organization and readability. This library is particularly beneficial for developers looking to streamline their navigation setup in Expo projects.

While expo-router is a great choice for Expo-based applications, there are several alternatives in the React ecosystem that also provide routing solutions:

• react-navigation is one of the most popular routing libraries for React Native applications. It offers a comprehensive set of navigation components and APIs, allowing developers to create complex navigation flows with ease. React Navigation supports stack, tab, and drawer navigators, making it highly versatile for various app structures. If you are building a React Native app that requires advanced navigation capabilities and customization, react-navigation is an excellent option.
• react-router is a widely-used routing library for React applications, primarily focused on web applications. It provides a powerful and flexible API for managing routes and navigation. While it is not specifically designed for React Native, it can still be used in React Native projects with some adjustments. If you are looking for a robust routing solution that can work across both web and mobile platforms, react-router is a solid choice.
• wouter is a lightweight routing library for React applications that focuses on simplicity and minimalism. It provides a small footprint and an easy-to-use API, making it a great choice for projects that require basic routing functionality without the overhead of more complex libraries. If you are building a simple React application and want a straightforward routing solution, wouter is worth considering.

To see how expo-router compares with react-navigation, react-router, and wouter, check out the comparison: Comparing expo-router vs react-navigation vs react-router vs wouter.