Constants

expo-constants provides system information that remains constant throughout the lifetime of your app's install.

Android Device	Android Emulator	iOS Device	iOS Simulator	Web

Installation

Terminal

→ expo install expo-constants

import Constants from 'expo-constants';

Name	Type	Description
scopeKey (optional)	`string`	An opaque unique string for scoping client-side data to this project. This value will not change when a project is transferred between accounts or renamed.

Name	Type	Description
projectId (optional)	`string`	The ID for this project if it's using EAS. UUID. This value will not change when a project is transferred between accounts or renamed.

ExpoConfig extended by:

Name	Type	Description
bundleUrl	`string`	-
currentFullName (optional)	`string`	The Expo account name and slug used for display purposes. Formatted like `@username/slug`. When unauthenticated, the username is `@anonymous`. For published projects, this value may change when a project is transferred between accounts or renamed.
hostUri (optional)	`string`	-
id (optional)	`string`	Deprecated. Prefer `projectId` or `originalFullName` instead for identification and `scopeKey` for scoping due to immutability. The Expo account name and slug for this project.
originalFullName (optional)	`string`	The original Expo account name and slug for this project. Formatted like `@username/slug`. When unauthenticated, the username is `@anonymous`. For published projects, this value will not change when a project is transferred between accounts or renamed.
publishedTime (optional)	`string`	-
releaseChannel (optional)	`string`	-
releaseId (optional)	`string`	Published apps only.
revisionId (optional)	`string`	-

A modern manifest.

Name	Type	Description
versionCode	`number`	Deprecated. Use `expo-application`'s `Application.nativeBuildVersion`. The version code set by `android.versionCode` in app.json. The value is set to `null` in case you run your app in Expo Go.

Extends: NativeConstants

Name	Type	Description

Name	Type	Description
buildNumber	`null \| string`	The build number specified in the embedded Info.plist value for `CFBundleVersion` in this app. In a standalone app, you can set this with the `ios.buildNumber` value in app.json. This may differ from the value in `Constants.manifest.ios.buildNumber` because the manifest can be updated, whereas this value will never change for a given native binary. The value is set to `null` in case you run your app in Expo Go.
model	`null \| string`	Deprecated. Moved to `expo-device` as `Device.modelName`. The human-readable model name of this device, e.g. `"iPhone 7 Plus"` if it can be determined, otherwise will be `null`.
platform	`string`	Deprecated. Use `expo-device`'s `Device.modelId`. The Apple internal model identifier for this device, e.g. `iPhone1,1`.
systemVersion	`string`	Deprecated. Use `expo-device`'s `Device.osVersion`. The version of iOS running on this device, e.g. `10.3`.
userInterfaceIdiom	`UserInterfaceIdiom`	Deprecated. Use `expo-device`'s `Device.getDeviceTypeAsync()`. The user interface idiom of this device, i.e. whether the app is running on an iPhone or an iPad.

Name	Type	Description
url	`string`	-

Expo - The experience is running inside of the Expo Go app.
AppOwnership.Expo ＝ "expo"
Guest - It has been opened through a link from a standalone app.
AppOwnership.Guest ＝ "guest"
Standalone - It is a standalone app.
AppOwnership.Standalone ＝ "standalone"

Current supported values are handset and tablet. Apple TV and CarPlay will show up as unsupported.