Expo
Expo is an open-source platform and toolchain built around React Native that simplifies building, testing, and deploying universal apps for iOS, Android, and the web from a single JavaScript or TypeScript codebase.
Definition
Expo is an open-source platform and toolchain built around React Native that simplifies building, testing, and deploying universal apps for iOS, Android, and the web from a single JavaScript or TypeScript codebase.
Overview
Expo reduces much of the native-tooling burden of React Native development by providing a managed workflow, a large library of prebuilt native modules, and cloud build and submission services, so developers can iterate without configuring Xcode or Android Studio for everyday tasks. The Expo Go app lets developers preview an app instantly on a physical device without producing a native build first, while Expo Application Services (EAS) handles cloud builds, over-the-air updates, and app store submissions. Expo Router adds file-based navigation on top of React Native, echoing patterns popularized by web frameworks like Next.js. Expo has become the default starting point for most new React Native projects, and config plugins let teams add custom native code when the managed workflow alone isn't enough. It's often compared to plain React Native without Expo, and to Flutter as a cross-platform alternative — the workflow is covered directly in SkillVeris's React Native course.
Key Features
- Managed workflow that removes most native build configuration for everyday development
- Expo Go app for instant on-device previews without a native build
- EAS (Expo Application Services) for cloud builds and app store submissions
- Over-the-air (OTA) updates to ship JS changes without a full app store review
- Expo Router for file-based navigation across native and web
- Large library of prebuilt native modules, such as camera, notifications, and location
- Supports building for iOS, Android, and web from one codebase