An API that provides system information that remains constant throughout the lifetime of your app's installation.
expo-constants provides system information that remains constant throughout the lifetime of your app's installation.
| Android Device | Android Emulator | iOS Device | iOS Simulator | Web |
|---|---|---|---|---|
- npx expo install expo-constantsIf 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.
import Constants from 'expo-constants';
AndroidManifest Properties
| Name | Type | Description |
|---|---|---|
| versionCode | number |
The version code set by |
IOSManifest Properties
| Name | Type | Description |
|---|---|---|
| buildNumber | null | string | The build number specified in the embedded Info.plist value for |
| model | null | string |
The human-readable model name of this device, e.g. |
| platform | string |
The Apple internal model identifier for this device, e.g. |
| systemVersion | string |
The version of iOS running on this device, e.g. |
| userInterfaceIdiom | UserInterfaceIdiom |
The user interface idiom of this device, i.e. whether the app is running on an iPhone, iPad, Mac or Apple TV. |
NativeConstants Properties
| Name | Type | Description |
|---|---|---|
| appOwnership | null | AppOwnership | Returns |
| debugMode | boolean | - |
| deviceName (optional) | string | A human-readable name for the device type. |
| deviceYearClass | null | number |
The device year class of this device. |
| easConfig | null | EASConfig | The standard EAS config object populated when using EAS. |
| executionEnvironment | ExecutionEnvironment | - |
| experienceUrl | string | - |
| expoConfig | null | ExpoConfig & {
hostUri: string
} | The standard Expo config object defined in |
| expoGoConfig | null | ExpoGoConfig | The standard Expo Go config object populated when running in Expo Go. |
| expoRuntimeVersion | null | string | - |
| expoVersion | null | string | The version string of the Expo Go app currently running.
Returns |
| getWebViewUserAgentAsync | () => Promise<null | string> | - |
| installationId | string |
An identifier that is unique to this particular device and whose lifetime is at least as long as the installation of the app. |
| intentUri (optional) | string | - |
| isDetached (optional) | boolean | - |
| isDevice | boolean |
|
| isHeadless | boolean | - |
| linkingUri | string | - |
| manifest | null | BareManifest |
Classic manifest for Expo apps using classic updates and the updates embedded in builds.
Returns |
| manifest2 | null | NewManifest | Manifest for Expo apps using modern Expo Updates from a remote source, such as apps that
use EAS Update. Returns |
| nativeAppVersion | null | string |
The Info.plist value for |
| nativeBuildVersion | null | string |
The Info.plist value for |
| platform (optional) | PlatformManifest | - |
| sessionId | string | A string that is unique to the current session of your app. It is different across apps and across multiple launches of the same app. |
| statusBarHeight | number | The default status bar height for the device. Does not factor in changes when location tracking is in use or a phone call is active. |
| systemFonts | string[] | A list of the system font names available on the current device. |
| systemVersion (optional) | number | - |
PlatformManifest Properties
| Name | Type | Description |
|---|---|---|
| android (optional) | AndroidManifest | - |
| detach (optional) | {
scheme: string
} | - |
| developer (optional) | string | - |
| hostUri (optional) | string | - |
| ios (optional) | IOSManifest | - |
| scheme (optional) | string | - |
| web (optional) | WebManifest | - |
Type: ManifestsEASConfig
Type: ManifestsExpoGoConfig
Type: NewManifest
Type: ManifestAssetForReExport
Type: ManifestExtraForReExport
Current supported values are handset, tablet, desktop and tv. CarPlay will show up
as unsupported.