📄 expo/versions/latest/sdk/camera

File: camera.md | Updated: 11/15/2025

Source: https://docs.expo.dev/versions/latest/sdk/camera

Hide navigation

Ctrl K

Home Guides EAS Reference Learn

Reference version

SDK 54 (latest)

Archive Expo Snack Discord and Forums Newsletter

Expo Camera

GitHub Changelog npm

Ask AI

A React component that renders a preview for the device's front or back camera.

GitHub Changelog npm

Ask AI

Android (device only)

iOS (device only)

Web

Bundled version:

~17.0.9

Copy page

expo-camera provides a React component that renders a preview of the device's front or back camera. The camera's parameters such as zoom, torch, and flash mode are adjustable. Using CameraView, you can take photos and record videos that are saved to the app's cache. The component is also capable of detecting bar codes appearing in the preview. Run the example on your device to see all these features working together.

Installation

Terminal

Copy

- npx expo install expo-camera

If you are installing this in an existing React Native app , make sure to install expo in your project.

Configuration in app config

You can configure expo-camera using its built-in config plugin if you use config plugins in your project (Continuous Native Generation (CNG) ). The plugin allows you to configure various properties that cannot be set at runtime and require building a new app binary to take effect. If your app does not use CNG, then you'll need to manually configure the library.

Example app.json with config plugin

app.json

Copy

{ "expo": { "plugins": [ [ "expo-camera", { "cameraPermission": "Allow $(PRODUCT_NAME) to access your camera", "microphonePermission": "Allow $(PRODUCT_NAME) to access your microphone", "recordAudioAndroid": true } ] ] } }

Configurable properties

| Name | Default | Description | | --- | --- | --- | | cameraPermission | "Allow $(PRODUCT_NAME) to access your camera" | Only for: iOS A string to set the NSCameraUsageDescription permission message. | | microphonePermission | "Allow $(PRODUCT_NAME) to access your microphone" | Only for: iOS A string to set the NSMicrophoneUsageDescription permission message. | | recordAudioAndroid | true | Only for: Android A boolean that determines whether to enable the RECORD_AUDIO permission on Android. |

Are you using this library in an existing React Native app?

If you're not using Continuous Native Generation (CNG ) (you're using native android and ios projects manually), then you need to configure following permissions in your native projects:

Android

expo-camera automatically adds android.permission.CAMERA permission to your project's android/app/src/main/AndroidManifest.xml. If you want to record videos with audio, include RECORD_AUDIO permission:

 <uses-permission android:name="android.permission.CAMERA" />  <uses-permission android:name="android.permission.RECORD_AUDIO" />
Then, adjust the android/build.gradle file to add new maven block after all other repositories as show below:

allprojects { repositories { // * Your other repositories here * // * Add a new maven block after other repositories / blocks * maven { // expo-camera bundles a custom com.google.android:cameraview url "$rootDir/../node_modules/expo-camera/android/maven" } } }

iOS

Add NSCameraUsageDescription and NSMicrophoneUsageDescription keys to your project's ios/[app]/Info.plist:

<key>NSCameraUsageDescription</key> <string>Allow $(PRODUCT_NAME) to access your camera</string> <key>NSMicrophoneUsageDescription</key> <string>Allow $(PRODUCT_NAME) to access your microphone</string>

Usage

Only one Camera preview can be active at any given time. If you have multiple screens in your app, you should unmount Camera components whenever a screen is unfocused.

Basic Camera Usage

Copy

Open in Snack

import { CameraView, CameraType, useCameraPermissions } from 'expo-camera'; import { useState } from 'react'; import { Button, StyleSheet, Text, TouchableOpacity, View } from 'react-native'; export default function App() { const [facing, setFacing] = useState<CameraType>('back'); const [permission, requestPermission] = useCameraPermissions(); if (!permission) { // Camera permissions are still loading. return <View />; } if (!permission.granted) { // Camera permissions are not granted yet. return ( <View style={styles.container}> <Text style={styles.message}>We need your permission to show the camera</Text> <Button onPress={requestPermission} title="grant permission" /> </View> ); } function toggleCameraFacing() { setFacing(current => (current === 'back' ? 'front' : 'back')); } return ( <View style={styles.container}> <CameraView style={styles.camera} facing={facing} /> <View style={styles.buttonContainer}> <TouchableOpacity style={styles.button} onPress={toggleCameraFacing}> <Text style={styles.text}>Flip Camera</Text> </TouchableOpacity> </View> </View> ); } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', }, message: { textAlign: 'center', paddingBottom: 10, }, camera: { flex: 1, }, buttonContainer: { position: 'absolute', bottom: 64, flexDirection: 'row', backgroundColor: 'transparent', width: '100%', paddingHorizontal: 64, }, button: { flex: 1, alignItems: 'center', }, text: { fontSize: 24, fontWeight: 'bold', color: 'white', }, });

Advanced usage

Camera app example

A complete example that shows how to take a picture and display it. Written in TypeScript.

Web support

Most browsers support a version of web camera functionality, you can check out the web camera browser support here . Image URIs are always returned as base64 strings because local file system paths are unavailable in the browser.

Chrome `iframe` usage

When using Chrome versions 64+, if you try to use a web camera in a cross-origin iframe nothing will render. To add support for cameras in your iframe simply add the attribute allow="microphone; camera;" to the iframe element:

<iframe src="..." allow="microphone; camera;">  </iframe>

API

import { CameraView } from 'expo-camera';

Component

`CameraView`

Android

iOS

Web

Type: React.[Component](https://react.dev/reference/react/Component) <[CameraViewProps](https://docs.expo.dev/versions/latest/sdk/camera#cameraviewprops) >

CameraViewProps

`active`

iOS

Optional • Type: boolean • Default: true

A boolean that determines whether the camera should be active. Useful in situations where the camera may not have unmounted but you still want to stop the camera session.

`animateShutter`

Android

iOS

Web

Optional • Type: boolean • Default: true

A boolean that determines whether the camera shutter animation should be enabled.

`autofocus`

iOS

Optional • Type: [FocusMode](https://docs.expo.dev/versions/latest/sdk/camera#focusmode) • Default: off

Indicates the focus mode to use.

`barcodeScannerSettings`

Android

iOS

Web

Optional • Type: [BarcodeSettings](https://docs.expo.dev/versions/latest/sdk/camera#barcodesettings)

Example

<CameraView barcodeScannerSettings={{ barcodeTypes: ["qr"], }} />

`enableTorch`

Android

iOS

Web

Optional • Type: boolean • Default: false

A boolean to enable or disable the torch.

`facing`

Android

iOS

Web

Optional • Type: [CameraType](https://docs.expo.dev/versions/latest/sdk/camera#cameratype) • Default: 'back'

Camera facing. Use one of CameraType. When front, use the front-facing camera. When back, use the back-facing camera.

`flash`

Android

iOS

Web

Optional • Type: [FlashMode](https://docs.expo.dev/versions/latest/sdk/camera#flashmode) • Default: 'off'

Camera flash mode. Use one of FlashMode values. When on, the flash on your device will turn on when taking a picture. When off, it won't. Setting it to auto will fire flash if required.

`mirror`

Android

iOS

Web

Optional • Type: boolean • Default: false

A boolean that determines whether the camera should mirror the image when using the front camera.

`mode`

Android

iOS

Web

Optional • Type: [CameraMode](https://docs.expo.dev/versions/latest/sdk/camera#cameramode) • Default: 'picture'

Used to select image or video output.

`mute`

Android

iOS

Web

Optional • Type: boolean • Default: false

If present, video will be recorded with no sound.

`onAvailableLensesChanged`

iOS

Optional • Type: (event: [AvailableLenses](https://docs.expo.dev/versions/latest/sdk/camera#availablelenses) ) => void

Callback invoked when the cameras available lenses change.

event: [AvailableLenses](https://docs.expo.dev/versions/latest/sdk/camera#availablelenses)

result object that contains a lenses property containing an array of available lenses.

`onBarcodeScanned`

Android

iOS

Web

Optional • Type: (scanningResult: [BarcodeScanningResult](https://docs.expo.dev/versions/latest/sdk/camera#barcodescanningresult) ) => void

Callback that is invoked when a barcode has been successfully scanned. The callback is provided with an object of the BarcodeScanningResult shape, where the type refers to the barcode type that was scanned, and the data is the information encoded in the barcode (in this case of QR codes, this is often a URL). See BarcodeType for supported values.

`onCameraReady`

Android

iOS

Web

Optional • Type: () => void

Callback invoked when camera preview has been set.

`onMountError`

Android

iOS

Web

Optional • Type: (event: [CameraMountError](https://docs.expo.dev/versions/latest/sdk/camera#cameramounterror) ) => void

Callback invoked when camera preview could not start.

event: [CameraMountError](https://docs.expo.dev/versions/latest/sdk/camera#cameramounterror)

Error object that contains a message.

`onResponsiveOrientationChanged`

iOS

Optional • Type: (event: [ResponsiveOrientationChanged](https://docs.expo.dev/versions/latest/sdk/camera#responsiveorientationchanged) ) => void

Callback invoked when responsive orientation changes. Only applicable if responsiveOrientationWhenOrientationLocked is true.

event: [ResponsiveOrientationChanged](https://docs.expo.dev/versions/latest/sdk/camera#responsiveorientationchanged)

result object that contains updated orientation of camera

`pictureSize`

Android

iOS

Web

Optional • Type: string

A string representing the size of pictures takePictureAsync will take. Available sizes can be fetched with getAvailablePictureSizesAsync . Setting this prop will cause the ratio prop to be ignored as the aspect ratio is determined by the selected size.

`poster`

Web

Optional • Type: string

A URL for an image to be shown while the camera is loading.

`ratio`

Android

Optional • Type: [CameraRatio](https://docs.expo.dev/versions/latest/sdk/camera#cameraratio)

A string representing the aspect ratio of the preview. For example, 4:3 and 16:9. Note: Setting the aspect ratio here will change the scaleType of the camera preview from FILL to FIT. Also, when using 1:1, devices only support certain sizes. If you specify an unsupported size, the closest supported ratio will be used.

`responsiveOrientationWhenOrientationLocked`

iOS

Optional • Type: boolean

Whether to allow responsive orientation of the camera when the screen orientation is locked (that is, when set to true, landscape photos will be taken if the device is turned that way, even if the app or device orientation is locked to portrait).

`selectedLens`

iOS

Optional • Type: string • Default: 'builtInWideAngleCamera'

Available lenses are emitted to the onAvailableLensesChanged callback whenever the currently selected camera changes or by calling getAvailableLensesAsync . You can read more about the available lenses in the Apple documentation .

`videoBitrate`

Android

iOS

Web

Optional • Type: number

The bitrate of the video recording in bits per second. Note: On iOS, you must specify the video codec when calling recordAsync to use this option.

Example

10_000_000

`videoQuality`

Android

iOS

Web

Optional • Type: [VideoQuality](https://docs.expo.dev/versions/latest/sdk/camera#videoquality)

Specify the quality of the recorded video. Use one of VideoQuality possible values: for 16:9 resolution 2160p, 1080p, 720p, 480p : Android only and for 4:3 4:3 (the size is 640x480). If the chosen quality is not available for a device, the highest available is chosen.

`videoStabilizationMode`

iOS

Optional • Type: [VideoStabilization](https://docs.expo.dev/versions/latest/sdk/camera#videostabilization)

The video stabilization mode used for a video recording. Use one of VideoStabilization.<value> . You can read more about each stabilization type in Apple Documentation .

`zoom`

Android

iOS

Web

Optional • Type: number • Default: 0

A value between 0 and 1 being a percentage of device's max zoom, where 0 means not zoomed and 1 means maximum zoom.

Inherited Props

[ViewProps](https://reactnative.dev/docs/view#props)

Static Methods

`dismissScanner()`

iOS

Dismiss the scanner presented by launchScanner.

On Android, the scanner is dismissed automatically when a barcode is scanned.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

`getAvailableVideoCodecsAsync()`

iOS

Queries the device for the available video codecs that can be used in video recording.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[VideoCodec[]](https://docs.expo.dev/versions/latest/sdk/camera#videocodec) >

A promise that resolves to a list of strings that represents available codecs.

`isAvailableAsync()`

Web

Check whether the current device has a camera. This is useful for web and simulators cases. This isn't influenced by the Permissions API (all platforms), or HTTP usage (in the browser). You will still need to check if the native permission has been accepted.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <boolean>

`launchScanner(options)`

Android

iOS

| Parameter | Type | | --- | --- | | options(optional) | [ScanningOptions](https://docs.expo.dev/versions/latest/sdk/camera#scanningoptions) |

On Android, we will use the Google code scanner . On iOS, presents a modal view controller that uses the DataScannerViewController available on iOS 16+.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

`onModernBarcodeScanned(listener)`

Android

iOS

| Parameter | Type | Description | | --- | --- | --- | | listener | (event: [ScanningResult](https://docs.expo.dev/versions/latest/sdk/camera#scanningresult) ) => void | Invoked with the ScanningResult when a bar code has been successfully scanned. |

Invokes the listener function when a bar code has been successfully scanned. The callback is provided with an object of the ScanningResult shape, where the type refers to the bar code type that was scanned and the data is the information encoded in the bar code (in this case of QR codes, this is often a URL). See BarcodeType for supported values.

Returns:

EventSubscription

Component Methods

`getAvailableLensesAsync()`

iOS

Returns the available lenses for the currently selected camera.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <string[]>

Returns a Promise that resolves to an array of strings representing the lens type that can be passed to selectedLens prop.

`getAvailablePictureSizesAsync()`

Android

iOS

Web

Get picture sizes that are supported by the device.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <string[]>

Returns a Promise that resolves to an array of strings representing picture sizes that can be passed to pictureSize prop. The list varies across Android devices but is the same for every iOS.

`getSupportedFeatures()`

Android

iOS

Web

Returns an object with the supported features of the camera on the current device.

Returns:

{ isModernBarcodeScannerAvailable: boolean, toggleRecordingAsyncAvailable: boolean }

`pausePreview()`

Android

iOS

Web

Pauses the camera preview. It is not recommended to use takePictureAsync when preview is paused.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

`recordAsync(options)`

Android

iOS

| Parameter | Type | Description | | --- | --- | --- | | options(optional) | [CameraRecordingOptions](https://docs.expo.dev/versions/latest/sdk/camera#camerarecordingoptions) | A map of CameraRecordingOptions type. |

Starts recording a video that will be saved to cache directory. Videos are rotated to match device's orientation. Flipping camera during a recording results in stopping it.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <undefined | { uri: string }>

Returns a Promise that resolves to an object containing video file uri property and a codec property on iOS. The Promise is returned if stopRecording was invoked, one of maxDuration and maxFileSize is reached or camera preview is stopped.

`resumePreview()`

Android

iOS

Web

Resumes the camera preview.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

`stopRecording()`

Android

iOS

Stops recording if any is in progress.

Returns:

void

`takePictureAsync(optionsWithRef)`

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | optionsWithRef | [CameraPictureOptions](https://docs.expo.dev/versions/latest/sdk/camera#camerapictureoptions) & { pictureRef: true } | An object in form of CameraPictureOptions type and pictureRef key set to true. |

Takes a picture and returns an object that references the native image instance.

Note: Make sure to wait for the onCameraReady callback before calling this method.

Note: Avoid calling this method while the preview is paused. On Android, this will throw an error. On iOS, this will take a picture of the last frame that is currently on screen.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[PictureRef](https://docs.expo.dev/versions/latest/sdk/camera#pictureref) >

Returns a Promise that resolves to PictureRef class which contains basic image data, and a reference to native image instance which can be passed to other Expo packages supporting handling such an instance.

`takePictureAsync(options)`

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | options(optional) | [CameraPictureOptions](https://docs.expo.dev/versions/latest/sdk/camera#camerapictureoptions) | An object in form of CameraPictureOptions type. |

Takes a picture and saves it to app's cache directory. Photos are rotated to match device's orientation (if options.skipProcessing flag is not enabled) and scaled to match the preview.

Note: Make sure to wait for the onCameraReady callback before calling this method.

Note: Avoid calling this method while the preview is paused. On Android, this will throw an error. On iOS, this will take a picture of the last frame that is currently on screen.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[CameraCapturedPicture](https://docs.expo.dev/versions/latest/sdk/camera#cameracapturedpicture) >

Returns a Promise that resolves to CameraCapturedPicture object, where uri is a URI to the local image file on Android, iOS, and a base64 string on web (usable as the source for an Image element). The width and height properties specify the dimensions of the image.

base64 is included if the base64 option was truthy, and is a string containing the JPEG data of the image in Base64. Prepend it with 'data:image/jpg;base64,' to get a data URI, which you can use as the source for an Image element for example.

exif is included if the exif option was truthy, and is an object containing EXIF data for the image. The names of its properties are EXIF tags and their values are the values for those tags.

On native platforms, the local image URI is temporary. Use FileSystem.copy to make a permanent copy of the image.

`toggleRecordingAsync()`

Android

iOS

Web

Pauses or resumes the video recording. Only has an effect if there is an active recording. On iOS, this method only supported on iOS 18.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <undefined | void>

Example

const { toggleRecordingAsyncAvailable } = getSupportedFeatures() return ( {toggleRecordingAsyncAvailable && ( <Button title="Toggle Recording" onPress={toggleRecordingAsync} /> )} )

Hooks

`useCameraPermissions(options)`

Android

iOS

Web

| Parameter | Type | | --- | --- | | options(optional) | PermissionHookOptions<object> |

Check or request permissions to access the camera. This uses both requestCameraPermissionsAsync and getCameraPermissionsAsync to interact with the permissions.

Returns:

[null | PermissionResponse, RequestPermissionMethod<PermissionResponse>, GetPermissionMethod<PermissionResponse>]

Example

const [status, requestPermission] = useCameraPermissions();

`useMicrophonePermissions(options)`

Android

iOS

Web

| Parameter | Type | | --- | --- | | options(optional) | PermissionHookOptions<object> |

Check or request permissions to access the microphone. This uses both requestMicrophonePermissionsAsync and getMicrophonePermissionsAsync to interact with the permissions.

Returns:

[null | PermissionResponse, RequestPermissionMethod<PermissionResponse>, GetPermissionMethod<PermissionResponse>]

Example

const [status, requestPermission] = Camera.useMicrophonePermissions();

Classes

`CameraNativeModule`

Android

iOS

Web

Type: Class extends [NativeModule](https://docs.expo.dev/versions/v54.0.0/sdk/expo#nativemoduletype) <[CameraEvents](https://docs.expo.dev/versions/latest/sdk/camera#cameraevents) >

CameraNativeModule Properties

`dismissScanner`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

`getAvailableVideoCodecsAsync`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[VideoCodec[]](https://docs.expo.dev/versions/latest/sdk/camera#videocodec) >

`getCameraPermissionsAsync`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <PermissionResponse>

`getMicrophonePermissionsAsync`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <PermissionResponse>

`isAvailableAsync`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <boolean>

`isModernBarcodeScannerAvailable`

Android

iOS

Web

Read Only • Type: boolean

`launchScanner`

Android

iOS

Web

Read Only • Type: (options?: [ScanningOptions](https://docs.expo.dev/versions/latest/sdk/camera#scanningoptions) ) => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <void>

`requestCameraPermissionsAsync`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <PermissionResponse>

`requestMicrophonePermissionsAsync`

Android

iOS

Web

Read Only • Type: () => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <PermissionResponse>

`scanFromURLAsync`

Android

iOS

Web

Read Only • Type: (url: string, barcodeTypes?: [BarcodeType[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodetype) ) => [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[BarcodeScanningResult[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodescanningresult) >

`toggleRecordingAsyncAvailable`

Android

iOS

Web

Read Only • Type: boolean

`PictureRef`

Android

iOS

Web

Type: Class extends [SharedRef](https://docs.expo.dev/versions/v54.0.0/sdk/expo#sharedreftype) <'image'>

A reference to a native instance of the image.

PictureRef Properties

`height`

Android

iOS

Web

Type: number

Height of the image.

`nativeRefType`

Android

iOS

Web

Type: string

The type of the native reference.

`width`

Android

iOS

Web

Type: number

Width of the image.

PictureRef Methods

`savePictureAsync(options)`

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | options(optional) | [SavePictureOptions](https://docs.expo.dev/versions/latest/sdk/camera#savepictureoptions) | A map defining how modified image should be saved. |

Saves the image to the file system in the cache directory.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[PhotoResult](https://docs.expo.dev/versions/latest/sdk/camera#photoresult) >

Methods

`Camera.scanFromURLAsync(url, barcodeTypes)`

Android

iOS

Web

| Parameter | Type | Description | | --- | --- | --- | | url | string | URL to get the image from. | | barcodeTypes(optional) | [BarcodeType[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodetype) | An array of bar code types. Defaults to all supported bar code types on the platform. > Note: Only QR codes are supported on iOS. On android, the barcode should take up the majority of the image for best results. |

Scan bar codes from the image at the given URL.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[BarcodeScanningResult[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodescanningresult) >

A possibly empty array of objects of the BarcodeScanningResult shape, where the type refers to the barcode type that was scanned and the data is the information encoded in the barcode.

Interfaces

`Subscription`

Android

iOS

Web

A subscription object that allows to conveniently remove an event listener from the emitter.

Subscription Methods

`remove()`

Android

iOS

Web

Removes an event listener for which the subscription has been created. After calling this function, the listener will no longer receive any events from the emitter.

Returns:

void

Types

`AvailableLenses`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | lenses | string[] | - |

`BarcodeBounds`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | origin | [BarcodePoint](https://docs.expo.dev/versions/latest/sdk/camera#barcodepoint) | The origin point of the bounding box. | | size | [BarcodeSize](https://docs.expo.dev/versions/latest/sdk/camera#barcodesize) | The size of the bounding box. |

`BarcodePoint`

Android

iOS

Web

Type: [Point](https://docs.expo.dev/versions/latest/sdk/camera#point)

These coordinates are represented in the coordinate space of the camera source (e.g. when you are using the camera view, these values are adjusted to the dimensions of the view).

`BarcodeScanningResult`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | bounds | [BarcodeBounds](https://docs.expo.dev/versions/latest/sdk/camera#barcodebounds) | The BarcodeBounds object. bounds in some case will be representing an empty rectangle. Moreover, bounds doesn't have to bound the whole barcode. For some types, they will represent the area used by the scanner. | | cornerPoints | [BarcodePoint[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodepoint) | Corner points of the bounding box. cornerPoints is not always available and may be empty. On iOS, for code39 and pdf417 you don't get this value. Note: Corner points order is currently different across platforms. On Android, Google MLKit's native order is used, which is topLeft, topRight, bottomRight, bottomLeft. On iOS, the order is bottomLeft, bottomRight, topLeft, topRight. On Web, the order is topLeft, bottomLeft, topRight, bottomRight. | | data | string | The parsed information encoded in the barcode. | | extra(optional) | AndroidBarcode | Only for: Android Extra information returned by the specific type of barcode. | | type | string | The barcode type. |

`BarcodeSettings`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | barcodeTypes | [BarcodeType[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodetype) | - |

`BarcodeSize`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | height | number | The height value. | | width | number | The width value. |

`BarcodeType`

Android

iOS

Web

Literal Type: string

The available barcode types that can be scanned.

`CameraCapturedPicture`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | base64(optional) | string | A Base64 representation of the image. | | exif(optional) | [Partial](https://www.typescriptlang.org/docs/handbook/utility-types.html#partialtype) <[MediaTrackSettings](https://developer.mozilla.org/en-US/docs/Web/API/MediaTrackSettings) > \| any | On Android and iOS this object may include various fields based on the device and operating system. On web, it is a partial representation of the MediaTrackSettings dictionary. | | format | 'jpg' \| 'png' | The format of the captured image. | | height | number | Captured image height. | | uri | string | On web, the value of uri is the same as base64 because file system URLs are not supported in the browser. | | width | number | Captured image width. |

`CameraEvents`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | onModernBarcodeScanned | (event: [ScanningResult](https://docs.expo.dev/versions/latest/sdk/camera#scanningresult) ) => void | - |

`CameraMode`

Android

iOS

Web

Literal Type: string

Acceptable values are: 'picture' | 'video'

`CameraMountError`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | message | string | - |

`CameraOrientation`

Android

iOS

Web

Literal Type: string

Acceptable values are: 'portrait' | 'portraitUpsideDown' | 'landscapeLeft' | 'landscapeRight'

`CameraPictureOptions`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | additionalExif(optional) | Record<string, any> | Only for: Android iOS Additional EXIF data to be included for the image. Only useful when exif option is set to true. | | base64(optional) | boolean | Whether to also include the image data in Base64 format. | | exif(optional) | boolean | Whether to also include the EXIF data for the image. | | imageType(optional) | [ImageType](https://docs.expo.dev/versions/latest/sdk/camera#imagetype) | Only for: Web - | | isImageMirror(optional) | boolean | Only for: Web - | | mirror(optional) | boolean | > Deprecated Use mirror prop on CameraView instead. Android iOS When set to true, the output image will be flipped along the vertical axis when using the front camera. Default:false | | onPictureSaved(optional) | (picture: [CameraCapturedPicture](https://docs.expo.dev/versions/latest/sdk/camera#cameracapturedpicture) ) => void | A callback invoked when picture is saved. If set, the promise of this method will resolve immediately with no data after picture is captured. The data that it should contain will be passed to this callback. If displaying or processing a captured photo right after taking it is not your case, this callback lets you skip waiting for it to be saved. | | pictureRef(optional) | boolean | Whether the camera should return an image ref that can be used directly in the Image component. | | quality(optional) | number | Specify the compression quality from 0 to 1. 0 means compress for small size, and 1 means compress for maximum quality. Default:1 | | scale(optional) | number | Only for: Web - | | shutterSound(optional) | boolean | To programmatically disable the camera shutter sound Default:true | | skipProcessing(optional) | boolean | If set to true, camera skips orientation adjustment and returns an image straight from the device's camera. If enabled, quality option is discarded (processing pipeline is skipped as a whole). Although enabling this option reduces image delivery time significantly, it may cause the image to appear in a wrong orientation in the Image component (at the time of writing, it does not respect EXIF orientation of the images). > Note: Enabling skipProcessing would cause orientation uncertainty. Image component does not respect EXIF stored orientation information, that means obtained image would be displayed wrongly (rotated by 90°, 180° or 270°). Different devices provide different orientations. For example some Sony Xperia or Samsung devices don't provide correctly oriented images by default. To always obtain correctly oriented image disable skipProcessing option. |

`CameraRatio`

Android

iOS

Web

Literal Type: string

Acceptable values are: '4:3' | '16:9' | '1:1'

`CameraRecordingOptions`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | codec(optional) | [VideoCodec](https://docs.expo.dev/versions/latest/sdk/camera#videocodec) | Only for: iOS This option specifies what codec to use when recording the video. See VideoCodec for the possible values. | | maxDuration(optional) | number | Maximum video duration in seconds. | | maxFileSize(optional) | number | Maximum video file size in bytes. | | mirror(optional) | boolean | > Deprecated Use mirror prop on CameraView instead. If true, the recorded video will be flipped along the vertical axis. iOS flips videos recorded with the front camera by default, but you can reverse that back by setting this to true. On Android, this is handled in the user's device settings. |

`CameraType`

Android

iOS

Web

Literal Type: string

Acceptable values are: 'front' | 'back'

`FlashMode`

Android

iOS

Web

Literal Type: string

Acceptable values are: 'off' | 'on' | 'auto'

`FocusMode`

Android

iOS

Web

Literal Type: string

This option specifies the mode of focus on the device.

on - Indicates that the device should autofocus once and then lock the focus.
off - Indicates that the device should automatically focus when needed.

Acceptable values are: 'on' | 'off'

`ImageType`

Android

iOS

Web

Literal Type: string

Acceptable values are: 'png' | 'jpg'

`PermissionExpiration`

Android

iOS

Web

Literal Type: union

Permission expiration time. Currently, all permissions are granted permanently.

Acceptable values are: 'never' | number

`PermissionHookOptions`

Android

iOS

Web

Literal Type: union

Acceptable values are: PermissionHookBehavior | Options

`PermissionResponse`

Android

iOS

Web

An object obtained by permissions get and request functions.

| Property | Type | Description | | --- | --- | --- | | canAskAgain | boolean | Indicates if user can be asked again for specific permission. If not, one should be directed to the Settings app in order to enable/disable the permission. | | expires | [PermissionExpiration](https://docs.expo.dev/versions/latest/sdk/camera#permissionexpiration) | Determines time when the permission expires. | | granted | boolean | A convenience boolean that indicates if the permission is granted. | | status | [PermissionStatus](https://docs.expo.dev/versions/latest/sdk/camera#permissionstatus) | Determines the status of the permission. |

`PhotoResult`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | base64(optional) | string | A Base64 representation of the image. | | height | number | Height of the image. | | uri | string | A URI to the modified image (usable as the source for an Image or Video element). | | width | number | Width of the image. |

`Point`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | x | number | - | | y | number | - |

`ResponsiveOrientationChanged`

Android

iOS

Web

| Property | Type | Description | | --- | --- | --- | | orientation | [CameraOrientation](https://docs.expo.dev/versions/latest/sdk/camera#cameraorientation) | - |

`SavePictureOptions`

Android

iOS

Web

A map defining how modified image should be saved.

| Property | Type | Description | | --- | --- | --- | | base64(optional) | boolean | Whether to also include the image data in Base64 format. | | metadata(optional) | Record<string, any> | Additional metadata to be included for the image. | | quality(optional) | number | Specify the compression quality from 0 to 1. 0 means compress for small size, and 1 means compress for maximum quality. |

`ScanningOptions`

iOS

| Property | Type | Description | | --- | --- | --- | | barcodeTypes | [BarcodeType[]](https://docs.expo.dev/versions/latest/sdk/camera#barcodetype) | The type of codes to scan for. | | isGuidanceEnabled(optional) | boolean | Only for: iOS Guidance text, such as “Slow Down,” appears over the live video. Default:true | | isHighlightingEnabled(optional) | boolean | Only for: iOS Indicates whether the scanner displays highlights around recognized items. Default:false | | isPinchToZoomEnabled(optional) | boolean | Only for: iOS Indicates whether people can use a two-finger pinch-to-zoom gesture. Default:true |

`ScanningResult`

Android

iOS

Web

Type: [Omit](https://www.typescriptlang.org/docs/handbook/utility-types.html#omittype-keys) <[BarcodeScanningResult](https://docs.expo.dev/versions/latest/sdk/camera#barcodescanningresult) , 'bounds' | 'cornerPoints'>

`VideoCodec`

iOS

Literal Type: string

This option specifies what codec to use when recording a video.

Acceptable values are: 'avc1' | 'hvc1' | 'jpeg' | 'apcn' | 'ap4h'

`VideoQuality`

Android

iOS

Web

Literal Type: string

Acceptable values are: '2160p' | '1080p' | '720p' | '480p' | '4:3'

`VideoStabilization`

iOS

Literal Type: string

This option specifies the stabilization mode to use when recording a video.

Acceptable values are: 'off' | 'standard' | 'cinematic' | 'auto'

Enums

`PermissionStatus`

Android

iOS

Web

`DENIED`

PermissionStatus.DENIED ＝ "denied"

User has denied the permission.

`GRANTED`

PermissionStatus.GRANTED ＝ "granted"

User has granted the permission.

`UNDETERMINED`

PermissionStatus.UNDETERMINED ＝ "undetermined"

User hasn't granted or denied the permission yet.

Permissions

Android

This package automatically adds the CAMERA permission to your app. If you want to record videos with audio, you have to include the RECORD_AUDIO in your app.json inside the expo.android.permissions array.

| Android Permission | Description | | --- | --- | | CAMERA | Required to be able to access the camera device. | | RECORD_AUDIO | Allows an application to record audio. |

iOS

The following usage description keys are used by this library:

| Info.plist Key | Description | | --- | --- | | NSCameraUsageDescription | A message that tells the user why the app is requesting access to the device’s camera. | | NSMicrophoneUsageDescription | A message that tells the user why the app is requesting access to the device’s microphone. |

📄 expo/versions/latest/sdk/camera

Source: https://docs.expo.dev/versions/latest/sdk/camera

Expo Camera

Example app.json with config plugin

Configurable properties

Advanced usage

Chrome iframe usage

CameraView

active

animateShutter

autofocus

barcodeScannerSettings

enableTorch

facing

flash

mirror

mode

mute

onAvailableLensesChanged

onBarcodeScanned

onCameraReady

onMountError

onResponsiveOrientationChanged

pictureSize

poster

ratio

responsiveOrientationWhenOrientationLocked

selectedLens

videoBitrate

videoQuality

videoStabilizationMode

zoom

Inherited Props

dismissScanner()

getAvailableVideoCodecsAsync()

isAvailableAsync()

launchScanner(options)

onModernBarcodeScanned(listener)

getAvailableLensesAsync()

getAvailablePictureSizesAsync()

getSupportedFeatures()

pausePreview()

recordAsync(options)

resumePreview()

stopRecording()

takePictureAsync(optionsWithRef)

takePictureAsync(options)

toggleRecordingAsync()

useCameraPermissions(options)

useMicrophonePermissions(options)

CameraNativeModule

dismissScanner

getAvailableVideoCodecsAsync

getCameraPermissionsAsync

getMicrophonePermissionsAsync

isAvailableAsync

isModernBarcodeScannerAvailable

launchScanner

requestCameraPermissionsAsync

requestMicrophonePermissionsAsync

scanFromURLAsync

toggleRecordingAsyncAvailable

PictureRef

height

nativeRefType

width

savePictureAsync(options)

Camera.scanFromURLAsync(url, barcodeTypes)

Subscription

remove()

AvailableLenses

BarcodeBounds

BarcodePoint

BarcodeScanningResult

BarcodeSettings

BarcodeSize

BarcodeType

CameraCapturedPicture

CameraEvents

CameraMode

Chrome `iframe` usage

`CameraView`

`active`

`animateShutter`

`autofocus`

`barcodeScannerSettings`

`enableTorch`

`facing`

`flash`

`mirror`

`mode`

`mute`

`onAvailableLensesChanged`

`onBarcodeScanned`

`onCameraReady`

`onMountError`

`onResponsiveOrientationChanged`

`pictureSize`

`poster`

`ratio`

`responsiveOrientationWhenOrientationLocked`

`selectedLens`

`videoBitrate`

`videoQuality`

`videoStabilizationMode`

`zoom`

`dismissScanner()`

`getAvailableVideoCodecsAsync()`

`isAvailableAsync()`

`launchScanner(options)`

`onModernBarcodeScanned(listener)`

`getAvailableLensesAsync()`

`getAvailablePictureSizesAsync()`

`getSupportedFeatures()`

`pausePreview()`

`recordAsync(options)`

`resumePreview()`

`stopRecording()`

`takePictureAsync(optionsWithRef)`

`takePictureAsync(options)`

`toggleRecordingAsync()`

`useCameraPermissions(options)`

`useMicrophonePermissions(options)`

`CameraNativeModule`

`dismissScanner`

`getAvailableVideoCodecsAsync`

`getCameraPermissionsAsync`

`getMicrophonePermissionsAsync`

`isAvailableAsync`

`isModernBarcodeScannerAvailable`

`launchScanner`

`requestCameraPermissionsAsync`

`requestMicrophonePermissionsAsync`

`scanFromURLAsync`

`toggleRecordingAsyncAvailable`

`PictureRef`

`height`

`nativeRefType`

`width`

`savePictureAsync(options)`

`Camera.scanFromURLAsync(url, barcodeTypes)`

`Subscription`

`remove()`

`AvailableLenses`

`BarcodeBounds`

`BarcodePoint`

`BarcodeScanningResult`

`BarcodeSettings`

`BarcodeSize`

`BarcodeType`

`CameraCapturedPicture`

`CameraEvents`

`CameraMode`

`CameraMountError`

`CameraOrientation`

`CameraPictureOptions`

`CameraRatio`

`CameraRecordingOptions`

`CameraType`

`FlashMode`