Use Flipper

A guide on installing and configuring Flipper for debugging an Expo project.

React Native no longer recommends Flipper (RFC0641). Features from Flipper, such as React Developer Tools and the network inspector, are available directly through Expo CLI in SDK 49 and greater. Learn more.

Flipper is a platform tool for debugging React Native projects on an emulator/simulator or a physical device. It supports projects running on Android and iOS and is available as a desktop application on macOS, Windows, and Linux.

It offers various features such as a device log viewer, interactive native layout inspector, network inspector, local database inspector, crash reporter, and more. You can add more plugins available in the Flipper desktop app.

Prerequisites

Before you get started, make sure you have the following installed on your computer:

Flipper desktop app
EAS CLI installed and logged in to your Expo account
Debugging your Expo projects with Flipper requires creating a development build of your project

Run setup doctor

Open the Flipper desktop app and click the Setup Doctor button from the bottom left menu.

If any dependencies are missing, follow the instructions provided by Flipper to install them.

Install `expo-dev-client`

Since Flipper requires native code, you'll need to create a development build. To set it up, install the expo-dev-client library:

Terminal

- npx expo install expo-dev-client

Add `expo-build-properties`

The Expo SDK uses the bundled version of Flipper from react-native. For Android, Flipper is enabled by default.

For iOS, you need to install expo-build-properties and enable Flipper in the plugin configuration:

Terminal

- npx expo install expo-build-properties

Installing the package adds the expo-build-properties plugin to your project's app.json. To enable Flipper, add the ios.flipper property and set it to true in the plugin configuration:

app.json

{
  "plugins": [
    [
      "expo-build-properties",
      {
        "ios": {
          "flipper": true
        }
      }
    ]
  ]
}

Using SDK 47 or lower?

The above configuration only works with SDK 48 or above. For SDK 47 and lower, use the following steps described:

The expo-community-flipper plugin depends on the react-native-flipper library. Run the following command to install both of them:

Terminal

- npx expo install expo-community-flipper react-native-flipper

Then, in the app.json, add expo-community-flipper to the plugins array:

app.json

{
  "plugins": ["expo-community-flipper"]
}

Configure and install a development build

To configure and install a development build, follow the instructions below:

Run the development server

After installing the build, run the following command to start a development server:

Terminal

# For SDK 49 and higher

- npx expo start

# For SDK 48 and lower

- npx expo start --dev-client

Once the development server is running, open the Flipper desktop app and select your device or simulator under App Inspect:

Open a device or emulator/simulator in Flipper under App Inspect.

Limitations

If a third-party library uses "useFrameworks": "static" for iOS in your project, integrating Flipper will not work since it is incompatible. For more information, see the notice on the compatibility issue in the expo-community-flipper GitHub repository.

To learn more about the tool, see React Native support in Flipper documentation.

Use Flipper

Run setup doctor

Add expo-build-properties

Configure and install a development build

Run the development server

Limitations

More

Add `expo-build-properties`