react-native-start

Start Metro bundler

$ react-native start

$ react-native start --port [8082]

$ react-native start --reset-cache

$ react-native start --verbose

react-native start [options]

react-native start launches the Metro JavaScript bundler, a development server that compiles and serves JavaScript bundles to React Native apps running on simulators, emulators, or physical devices. It watches source files for changes and pushes updates to connected apps via hot reloading, enabling rapid development without full rebuilds.
The bundler listens on port 8081 by default and can be customized with --port. The --reset-cache flag clears the bundler's transformation cache, which is useful when resolving stale module resolution issues or after changing configuration.

--port port

Server port (default 8081).

Clear bundler cache.

Verbose output.

Server hostname.

Enable HTTPS.

Metro config file.

react-native(1), metro(1)