Create development builds

Learn how to create development builds for a project.

Development builds can be created with EAS Build or locally on your computer, if you have Xcode and Android Studio. In the following sections, you will find information on how to create a development build and then install them on an emulator/simulator or a physical device to continue developing your app.

Prerequisites

You need to initialize your project with Expo. If you still need to do so, see the initializing steps if you are starting a new project.

We also recommend installing EAS CLI as a global npm dependency by running the following command:

Terminal

- npm install -g eas-cli

Install expo-dev-client

To initialize a development build, you need to install the expo-dev-client library in your project:

Terminal

- npx expo install expo-dev-client

Create and install EAS Build

We recommend EAS Build to manage your native projects. It allows a smooth experience, especially if you do not have experience with Xcode and Android studio builds or do not have them installed locally on your computer.

EAS Build is created by running the eas build command. It also creates an eas.json file at the root of your project directory with three build profiles automatically: development, preview and production. A minimal configuration is shown below:

eas.json

{
  "build": {
    "development": {
      "developmentClient": true,
      "distribution": "internal"
    },
    "preview": {
      "distribution": "internal"
    },
    "production": {}
  }
}

The development profile sets the following options:

developmentClient to true to create a Debug build. This allows the expo-dev-client library to choose the update to load in your app and provide tools to help you develop it. It also generates a build artifact that you can install on a device or emulator/simulator.
distribution to internal makes the build ready for internal distribution.

iOS builds where developmentClient is set to true on the build profile should always be distributed as internal. If you are distributing for TestFlight, you have to set the distribution to store.

On emulator/simulator

Follow the steps below to create and install the development build on an Android Emulator or an iOS Simulator.

This is only required if you want to develop a project on an emulator/simulator. Otherwise, skip these steps if you are using a device.

Each platform has specific instructions you'll have to follow:

To create and install the development build on an Android Emulator, you will need an .apk. To create it, run the following command:

Terminal

- eas build --profile development --platform android

After the build is complete, the CLI will prompt you to automatically download and install it on the Android Emulator. When prompted, press Y to directly install it on the emulator.

See Build APKs for Android Emulators and devices for more information.

To create and install a development build on an iOS Simulator, we recommend you create a separate build profile for the simulator and then set the ios.simulator option to true in the eas.json.

For example, the development-simulator profile below is only for creating a development build for iOS Simulator:

eas.json

{
  "build": {
    "development-simulator": {
      "developmentClient": true,
      "distribution": "internal",
      "ios": {
        "simulator": true
      }
    }
  }
}

Then, run the following command to create the development build on an iOS Simulator:

Terminal

- eas build --profile development-simulator --platform ios

After the build is complete, the CLI will prompt you to automatically download and install the it on the iOS Simulator. When prompted, press Y to directly install it on the simulator.

See Installing build on the simulator for more information.

On a device

Follow the steps below to create and install the development build on an Android or an iOS device. Each platform has specific instructions you'll have to follow:

If you have created a development build for Android Emulator, you do not need to create it separately for the device. You can skip this step since the same .apk will work in both scenarios.

To create and install the development build on an Android device, you will need a .apk. To create it, run the following command:

Terminal

- eas build --profile development --platform android

After the build is complete, copy the URL to the .apk from the build details page or the link provided when eas build has finished. Then, send that URL to your device and open it on your device to download and install the .apk.

To share the build with your team, direct them to the build page in the Expo dashboard. From there, they can download the build artifact directly on their device. Or, you can share the link to the .apk.

Apple Developer membership is required to create and install a development build on an iOS device.

To register any iOS device you'd like to develop onto your ad hoc provisioning profile, run the following command:

Terminal

- eas device:create

After registering your iOS device, you can create the development build by running the command:

Terminal

- eas build --profile development --platform ios

After the build is complete, you can download it on your iOS device by scanning the QR code from the device's camera from the Expo CLI. The QR code is provided when the eas build command has finished running.

You can also find this QR code on the build page in the Expo dashboard. Click the Install button and scan the QR code using the system's camera.

To share the build with your team, direct them to the build page in the Expo dashboard. From there, they can download it directly on their device by scanning the QR code using the system's camera.

If you register any new iOS devices after creating a development build, you'll need to create a new development build to install it on those devices. For more information, see internal distribution.

Next steps

Use a development build

Learn about how to use the development build that you have just installed.