This is documentation for the next SDK version. For up-to-date documentation, see the latest version (SDK 51).

Expo Device iconExpo Device

GitHub

npm

A universal library provides access to system information about the physical device.

Android
iOS
tvOS
Web

expo-device provides access to system information about the physical device, such as its manufacturer and model.

Installation

Terminal
npx expo install expo-device

If you are installing this in an existing React Native app, start by installing expo in your project. Then, follow the additional instructions as mentioned by the library's README under "Installation in bare React Native projects" section.

Usage

Basic Device Usage
import { Text, View } from 'react-native';
import * as Device from 'expo-device';

export default function App() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>
        {Device.manufacturer}: {Device.modelName}
      </Text>
    </View>
  );
}

API

import * as Device from 'expo-device';

Constants

Android
iOS

Device.brand

Type: string | null


The device brand. The consumer-visible brand of the product/hardware. On web, this value is always null.

Example

Device.brand; // Android: "google", "xiaomi"; iOS: "Apple"; web: null
Android

Device.designName

Type: string | null


The specific configuration or name of the industrial design. It represents the device's name when it was designed during manufacturing into mass production. On Android, it corresponds to Build.DEVICE. On web and iOS, this value is always null.

Example

Device.designName; // Android: "kminilte"; iOS: null; web: null
Android
iOS
tvOS
Web

Device.deviceName

Type: string | null


The human-readable name of the device, which may be set by the device's user. If the device name is unavailable, particularly on web, this value is null.

On iOS 16 and newer, this value will be set to generic "iPhone" until you add the correct entitlement, see iOS Capabilities page to learn how to add one and check out Apple documentation for more details on this change.

Example

Device.deviceName; // "Vivian's iPhone XS"
Android
iOS
tvOS
Web

Device.deviceType

Type: DeviceType | null


The type of the device as a DeviceType enum value.

On Android, for devices other than TVs, the device type is determined by the screen resolution (screen diagonal size), so the result may not be completely accurate. If the screen diagonal length is between 3" and 6.9", the method returns DeviceType.PHONE. For lengths between 7" and 18", the method returns DeviceType.TABLET. Otherwise, the method returns DeviceType.UNKNOWN.

Example

Device.deviceType; // UNKNOWN, PHONE, TABLET, TV, DESKTOP
Android
iOS
tvOS
Web

Device.deviceYearClass

Type: number | null


The device year class of this device. On web, this value is always null.

Android
iOS
tvOS
Web

Device.isDevice

Type: boolean


true if the app is running on a real device and false if running in a simulator or emulator. On web, this is always set to true.

Android
iOS
tvOS
Web

Device.manufacturer

Type: string | null


The actual device manufacturer of the product or hardware. This value of this field may be null if it cannot be determined.

To view difference between brand and manufacturer on Android see official documentation.

Example

Device.manufacturer; // Android: "Google", "xiaomi"; iOS: "Apple"; web: "Google", null
iOS

Device.modelId

Type: any


The internal model ID of the device. This is useful for programmatically identifying the type of device and is not a human-friendly string. On web and Android, this value is always null.

Example

Device.modelId; // iOS: "iPhone7,2"; Android: null; web: null
Android
iOS
tvOS
Web

Device.modelName

Type: string | null


The human-friendly name of the device model. This is the name that people would typically use to refer to the device rather than a programmatic model identifier. This value of this field may be null if it cannot be determined.

Example

Device.modelName; // Android: "Pixel 2"; iOS: "iPhone XS Max"; web: "iPhone", null
Android

Device.osBuildFingerprint

Type: string | null


A string that uniquely identifies the build of the currently running system OS. On Android, it follows this template:

  • $(BRAND)/$(PRODUCT)/$(DEVICE)/$(BOARD):$(VERSION.RELEASE)/$(ID)/$(VERSION.INCREMENTAL):$(TYPE)/\$(TAGS) On web and iOS, this value is always null.

Example

Device.osBuildFingerprint;
// Android: "google/sdk_gphone_x86/generic_x86:9/PSR1.180720.075/5124027:user/release-keys";
// iOS: null; web: null
Android
iOS
tvOS
Web

Device.osBuildId

Type: string | null


The build ID of the OS that more precisely identifies the version of the OS. On Android, this corresponds to Build.DISPLAY (not Build.ID) and currently is a string as described here. On iOS, this corresponds to kern.osversion and is the detailed OS version sometimes displayed next to the more human-readable version. On web, this value is always null.

Example

Device.osBuildId; // Android: "PSR1.180720.075"; iOS: "16F203"; web: null
Android
iOS
tvOS
Web

Device.osInternalBuildId

Type: string | null


The internal build ID of the OS running on the device. On Android, this corresponds to Build.ID. On iOS, this is the same value as Device.osBuildId. On web, this value is always null.

Example

Device.osInternalBuildId; // Android: "MMB29K"; iOS: "16F203"; web: null,
Android
iOS
tvOS
Web

Device.osName

Type: string | null


The name of the OS running on the device.

Example

Device.osName; // Android: "Android"; iOS: "iOS" or "iPadOS"; web: "iOS", "Android", "Windows"
Android
iOS
tvOS
Web

Device.osVersion

Type: string | null


The human-readable OS version string. Note that the version string may not always contain three numbers separated by dots.

Example

Device.osVersion; // Android: "4.0.3"; iOS: "12.3.1"; web: "11.0", "8.1.0"
Android

Device.platformApiLevel

Type: number | null


The Android SDK version of the software currently running on this hardware device. This value never changes while a device is booted, but it may increase when the hardware manufacturer provides an OS update. See here to see all possible version codes and corresponding versions. On iOS and web, this value is always null.

Example

Device.platformApiLevel; // Android: 19; iOS: null; web: null
Android

Device.productName

Type: string | null


The device's overall product name chosen by the device implementer containing the development name or code name of the device. Corresponds to Build.PRODUCT. On web and iOS, this value is always null.

Example

Device.productName; // Android: "kminiltexx"; iOS: null; web: null
Android
iOS
tvOS
Web

Device.supportedCpuArchitectures

Type: string[] | null


A list of supported processor architecture versions. The device expects the binaries it runs to be compiled for one of these architectures. This value is null if the supported architectures could not be determined, particularly on web.

Example

Device.supportedCpuArchitectures; // ['arm64 v8', 'Intel x86-64h Haswell', 'arm64-v8a', 'armeabi-v7a", 'armeabi']
Android
iOS
tvOS
Web

Device.totalMemory

Type: number | null


The device's total memory, in bytes. This is the total memory accessible to the kernel, but not necessarily to a single app. This is basically the amount of RAM the device has, not including below-kernel fixed allocations like DMA buffers, RAM for the baseband CPU, etc… On web, this value is always null.

Example

Device.totalMemory; // 17179869184

Methods

Android
iOS
tvOS
Web

Device.getDeviceTypeAsync()

Checks the type of the device as a DeviceType enum value.

On Android, for devices other than TVs, the device type is determined by the screen resolution (screen diagonal size), so the result may not be completely accurate. If the screen diagonal length is between 3" and 6.9", the method returns DeviceType.PHONE. For lengths between 7" and 18", the method returns DeviceType.TABLET. Otherwise, the method returns DeviceType.UNKNOWN.

Returns a promise that resolves to a DeviceType enum value.

Example

await Device.getDeviceTypeAsync();
// DeviceType.PHONE
Android

Device.getMaxMemoryAsync()

Returns the maximum amount of memory that the Java VM will attempt to use. If there is no inherent limit then Number.MAX_SAFE_INTEGER is returned.

Returns:

Promise<number>

Returns a promise that resolves to the maximum available memory that the Java VM will use, in bytes.

Example

await Device.getMaxMemoryAsync();
// 402653184
Android

Device.getPlatformFeaturesAsync()

Gets a list of features that are available on the system. The feature names are platform-specific. See Android documentation to learn more about this implementation.

Returns:

Promise<string[]>

Returns a promise that resolves to an array of strings, each of which is a platform-specific name of a feature available on the current device. On iOS and web, the promise always resolves to an empty array.

Example

await Device.getPlatformFeaturesAsync();
// [
//   'android.software.adoptable_storage',
//   'android.software.backup',
//   'android.hardware.sensor.accelerometer',
//   'android.hardware.touchscreen',
// ]
Android
iOS

Device.getUptimeAsync()

Gets the uptime since the last reboot of the device, in milliseconds. Android devices do not count time spent in deep sleep.

Returns:

Promise<number>

Returns a promise that resolves to a number that represents the milliseconds since last reboot.

Example

await Device.getUptimeAsync();
// 4371054
Android

Device.hasPlatformFeatureAsync(feature)

ParameterTypeDescription
featurestring

The platform-specific name of the feature to check for on the device. You can get all available system features with Device.getSystemFeatureAsync(). See Android documentation to view acceptable feature strings.


Tells if the device has a specific system feature.

Returns:

Promise<boolean>

Returns a promise that resolves to a boolean value indicating whether the device has the specified system feature. On iOS and web, the promise always resolves to false.

Example

await Device.hasPlatformFeatureAsync('amazon.hardware.fire_tv');
// true or false
Android
iOS
tvOS
Web

Device.isRootedExperimentalAsync()

This method is experimental and is not completely reliable. See description below.

Checks whether the device has been rooted (Android) or jailbroken (iOS). This is not completely reliable because there exist solutions to bypass root-detection on both iOS and Android. Further, many root-detection checks can be bypassed via reverse engineering.

  • On Android, it's implemented in a way to find all possible files paths that contain the "su" executable but some devices that are not rooted may also have this executable. Therefore, there's no guarantee that this method will always return correctly.
  • On iOS, these jailbreak checks are used to detect if a device is rooted/jailbroken. However, since there are closed-sourced solutions such as xCon that aim to hook every known method and function responsible for informing an application of a jailbroken device, this method may not reliably detect devices that have xCon or similar packages installed.
  • On web, this always resolves to false even if the device is rooted.
Returns:

Promise<boolean>

Returns a promise that resolves to a boolean that specifies whether this device is rooted.

Example

await Device.isRootedExperimentalAsync();
// true or false
Android

Device.isSideLoadingEnabledAsync()

Using this method requires you to add the REQUEST_INSTALL_PACKAGES permission. Returns whether applications can be installed for this user via the system's ACTION_INSTALL_PACKAGE mechanism rather than through the OS's default app store, like Google Play.

Returns:

Promise<boolean>

Returns a promise that resolves to a boolean that represents whether the calling package is allowed to request package installation.

Example

await Device.isSideLoadingEnabledAsync();
// true or false

Enums

Android
iOS
tvOS
Web

DeviceType

An enum representing the different types of devices supported by Expo.

DeviceType Values

UNKNOWN

DeviceType.UNKNOWN = 0

An unrecognized device type.

PHONE

DeviceType.PHONE = 1

Mobile phone handsets, typically with a touch screen and held in one hand.

TABLET

DeviceType.TABLET = 2

Tablet computers, typically with a touch screen that is larger than a usual phone.

DESKTOP

DeviceType.DESKTOP = 3

Desktop or laptop computers, typically with a keyboard and mouse.

TV

DeviceType.TV = 4

Device with TV-based interfaces.

Error codes

CodeDescription
ERR_DEVICE_ROOT_DETECTIONError code thrown for isRootedExperimentalAsync. This may be thrown if there's no read access to certain system files.