Viewing your app on your phone

In order to view your React Native project on your device during development, we need to start the Expo development server:

1. In the command-line terminal, make sure that you're in the project directory:

   cd path/to/my-project

2. Once you're in my-project, you can run the following command to start the development server:

   npm start

3. This will show you some information about the developer server in the terminal:

   Starting project at /Users/sakhniuk/React-and-React-
   Native-4th-Edition-/Chapter16/my-project
   Developer tools running on http://localhost:19002
   Starting Metro Bundler
   ' Metro waiting on exp://192.168.1.233:19000
   ' Scan the QR code above with Expo Go (Android) or the
     Camera app (iOS)

4. It will also open a browser tab with the Expo developer tools for managing where the application is run, viewing logs, and other miscellaneous activities. Figure 16.1 shows what the Expo developer tools look like:

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