📄 expo/versions/latest/sdk/filesystem

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

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

Hide navigation

Ctrl K

Home Guides EAS Reference Learn

Reference version

SDK 54 (latest)

Archive Expo Snack Discord and Forums Newsletter

Expo FileSystem

GitHub Changelog npm

Ask AI

A library that provides access to the local file system on the device.

GitHub Changelog npm

Ask AI

Android

iOS

tvOS

Bundled version:

~19.0.17

Copy page

expo-file-system provides access to files and directories stored on a device or bundled as assets into the native project. It also allows downloading files from the network.

Installation

Terminal

Copy

- npx expo install expo-file-system

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

Usage

import { File, Directory, Paths } from 'expo-file-system';

The File and Directory instances hold a reference to a file, content, or asset URI.

The file or directory does not need to exist — an error will be thrown from the constructor only if the wrong class is used to represent an existing path (so if you try to create a File instance passing a path to an already existing directory).

Features

Both synchronous and asynchronous, read and write access to file contents
Creation, modification and deletion
Available properties, such as type, size, creationDate, and more
Ability to read and write files as streams or using the FileHandle class
Easy file download/upload using downloadFileAsync or expo/fetch

Examples

Writing and reading text files

example.ts

Copy

import { File, Paths } from 'expo-file-system'; try { const file = new File(Paths.cache, 'example.txt'); file.create(); // can throw an error if the file already exists or no permission to create it file.write('Hello, world!'); console.log(file.textSync()); // Hello, world! } catch (error) { console.error(error); } Picking files using system pickers

Usage with expo-document-picker:

example.ts

Copy

import { File } from 'expo-file-system'; import * as DocumentPicker from 'expo-document-picker'; try { const result = await DocumentPicker.getDocumentAsync({ copyToCacheDirectory: true }); const file = new File(result.assets[0]); console.log(file.textSync()); } catch (error) { console.error(error); }

Using the built-in pickFileAsync or pickDirectoryAsync method on Android:

example.ts

Copy

import { File } from 'expo-file-system'; try { const file = new File.pickFileAsync(); console.log(file.textSync()); } catch (error) { console.error(error); } Downloading files

Using downloadFileAsync:

example.ts

Copy

import { Directory, File, Paths } from 'expo-file-system'; const url = 'https://pdfobject.com/pdf/sample.pdf'; const destination = new Directory(Paths.cache, 'pdfs'); try { destination.create(); const output = await File.downloadFileAsync(url, destination); console.log(output.exists); // true console.log(output.uri); // path to the downloaded file, e.g., '${cacheDirectory}/pdfs/sample.pdf' } catch (error) { console.error(error); }

Or using expo/fetch:

example.ts

Copy

import { fetch } from 'expo/fetch'; import { File, Paths } from 'expo-file-system'; const url = 'https://pdfobject.com/pdf/sample.pdf'; const response = await fetch(url); const src = new File(Paths.cache, 'file.pdf'); src.write(await response.bytes()); Uploading files using expo/fetch

You can upload files as blobs directly with fetch built into the Expo package:

example.ts

Copy

import { fetch } from 'expo/fetch'; import { File, Paths } from 'expo-file-system'; const file = new File(Paths.cache, 'file.txt'); file.write('Hello, world!'); const response = await fetch('https://example.com', { method: 'POST', body: file, });

Or using the FormData constructor:

example.ts

Copy

import { fetch } from 'expo/fetch'; import { File, Paths } from 'expo-file-system'; const file = new File(Paths.cache, 'file.txt'); file.write('Hello, world!'); const formData = new FormData(); formData.append('data', file); const response = await fetch('https://example.com', { method: 'POST', body: formData, }); Moving and copying files

example.ts

Copy

import { Directory, File, Paths } from 'expo-file-system'; try { const file = new File(Paths.document, 'example.txt'); file.create(); console.log(file.uri); // '${documentDirectory}/example.txt' const copiedFile = new File(Paths.cache, 'example-copy.txt'); file.copy(copiedFile); console.log(copiedFile.uri); // '${cacheDirectory}/example-copy.txt' file.move(Paths.cache); console.log(file.uri); // '${cacheDirectory}/example.txt' file.move(new Directory(Paths.cache, 'newFolder')); console.log(file.uri); // '${cacheDirectory}/newFolder/example.txt' } catch (error) { console.error(error); } Using legacy FileSystem API

example.ts

Copy

import * as FileSystem from 'expo-file-system/legacy'; import { File, Paths } from 'expo-file-system'; try { const file = new File(Paths.cache, 'example.txt'); const content = await FileSystem.readAsStringAsync(file.uri); console.log(content); } catch (error) { console.error(error); }

Listing directory contents recursively

example.ts

Copy

import { Directory, Paths } from 'expo-file-system'; function printDirectory(directory: Directory, indent: number = 0) { console.log(`${' '.repeat(indent)} + ${directory.name}`); const contents = directory.list(); for (const item of contents) { if (item instanceof Directory) { printDirectory(item, indent + 2); } else { console.log(`${' '.repeat(indent + 2)} - ${item.name} (${item.size} bytes)`); } } } try { printDirectory(new Directory(Paths.cache)); } catch (error) { console.error(error); }

API

Classes

`Directory`

Android

iOS

tvOS

Type: Class extends FileSystemDirectory

Represents a directory on the filesystem.

A Directory instance can be created for any path, and does not need to exist on the filesystem during creation.

The constructor accepts an array of strings that are joined to create the directory URI. The first argument can also be a Directory instance (like Paths.cache).

Example

const directory = new Directory(Paths.cache, "subdirName");

Directory Properties

`exists`

Android

iOS

tvOS

Type: boolean

A boolean representing if a directory exists and can be accessed.

`size`

Android

iOS

tvOS

Literal type: union

A size of the directory in bytes. Null if the directory does not exist, or it cannot be read.

Acceptable values are: null | number

`uri`

Android

iOS

tvOS

Read Only • Type: string

Represents the directory URI. The field is read-only, but it may change as a result of calling some methods such as move.

`name`

Android

iOS

tvOS

Type: string

Directory name.

`parentDirectory`

Android

iOS

tvOS

Type: [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory)

Directory containing the file.

Directory Methods

`copy(destination)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | destination | [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) |

Copies a directory.

Returns:

void

`create(options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | options(optional) | [DirectoryCreateOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#directorycreateoptions) |

Creates a directory that the current uri points to.

Returns:

void

`createDirectory(name)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | name | string |

Returns:

[Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory)

`createFile(name, mimeType)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | name | string | | mimeType | null \| string |

Returns:

[File](https://docs.expo.dev/versions/latest/sdk/filesystem#file)

`delete()`

Android

iOS

tvOS

Deletes a directory. Also deletes all files and directories inside the directory.

Returns:

void

`info()`

Android

iOS

tvOS

Retrieves an object containing properties of a directory.

Returns:

[DirectoryInfo](https://docs.expo.dev/versions/latest/sdk/filesystem#directoryinfo)

An object with directory metadata (for example, size, creation date, and so on).

`list()`

Android

iOS

tvOS

Lists the contents of a directory. Calling this method if the parent directory does not exist will throw an error.

Returns:

([File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) | [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) )[]

An array of Directory and File instances.

`move(destination)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | destination | [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) |

Moves a directory. Updates the uri property that now points to the new location.

Returns:

void

`pickDirectoryAsync(initialUri)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | initialUri(optional) | string | An optional uri pointing to an initial folder on which the directory picker is opened. |

A static method that opens a file picker to select a directory.

On iOS, the selected directory grants temporary read and write access for the current app session only. After the app restarts, you must prompt the user again to regain access.

Returns:

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

a Directory instance. On Android, the underlying uri will be a content URI.

`rename(newName)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | newName | string |

Renames a directory.

Returns:

void

`File`

Android

iOS

tvOS

Type: Class extends FileSystemFile implements [Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob)

Represents a file on the filesystem.

A File instance can be created for any path, and does not need to exist on the filesystem during creation.

The constructor accepts an array of strings that are joined to create the file URI. The first argument can also be a Directory instance (like Paths.cache) or a File instance (which creates a new reference to the same file).

Example

const file = new File(Paths.cache, "subdirName", "file.txt");

File Properties

`creationTime`

Android

iOS

tvOS

Literal type: union

A creation time of the file expressed in milliseconds since epoch. Returns null if the file does not exist, cannot be read or the Android version is earlier than API 26.

Acceptable values are: null | number

`exists`

Android

iOS

tvOS

Type: boolean

A boolean representing if a file exists. true if the file exists, false otherwise. Also, false if the application does not have read access to the file.

`md5`

Android

iOS

tvOS

Literal type: union

A md5 hash of the file. Null if the file does not exist, or it cannot be read.

Acceptable values are: null | string

`modificationTime`

Android

iOS

tvOS

Literal type: union

A last modification time of the file expressed in milliseconds since epoch. Returns a Null if the file does not exist, or it cannot be read.

Acceptable values are: null | number

`size`

Android

iOS

tvOS

Type: number

A size of the file in bytes. 0 if the file does not exist, or it cannot be read.

`type`

Android

iOS

tvOS

Type: string

A mime type of the file. An empty string if the file does not exist, or it cannot be read.

`uri`

Android

iOS

tvOS

Read Only • Type: string

Represents the file URI. The field is read-only, but it may change as a result of calling some methods such as move.

`extension`

Android

iOS

tvOS

Type: string

File extension.

Example

'.png'

`name`

Android

iOS

tvOS

Type: string

File name. Includes the extension.

`parentDirectory`

Android

iOS

tvOS

Type: [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory)

Directory containing the file.

File Methods

`arrayBuffer()`

Android

iOS

tvOS

The arrayBuffer() method of the Blob interface returns a Promise that resolves with the contents of the blob as binary data contained in an ArrayBuffer.

MDN Reference

Returns:

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

`base64()`

Android

iOS

tvOS

Retrieves content of the file as base64.

Returns:

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

A promise that resolves with the contents of the file as a base64 string.

`base64Sync()`

Android

iOS

tvOS

Retrieves content of the file as base64.

Returns:

string

The contents of the file as a base64 string.

`bytes()`

Android

iOS

tvOS

Retrieves byte content of the entire file.

Returns:

[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) <[Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) <[ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) >>

A promise that resolves with the contents of the file as a Uint8Array.

`bytesSync()`

Android

iOS

tvOS

Retrieves byte content of the entire file.

Returns:

[Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array)

The contents of the file as a Uint8Array.

`copy(destination)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | destination | [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) |

Copies a file.

Returns:

void

`create(options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | options(optional) | [FileCreateOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#filecreateoptions) |

Creates a file.

Returns:

void

`delete()`

Android

iOS

tvOS

Deletes a file.

Returns:

void

`downloadFileAsync(url, destination, options)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | url | string | The URL of the file to download. | | destination | [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) | The destination directory or file. If a directory is provided, the resulting filename will be determined based on the response headers. | | options(optional) | [DownloadOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#downloadoptions) | Download options. When the destination already contains a file, the promise rejects with a DestinationAlreadyExists error unless options.idempotent is set to true. With idempotent: true, the download overwrites the existing file instead of failing. |

A static method that downloads a file from the network.

On Android, the response body streams directly into the target file. If the download fails after it starts, a partially written file may remain at the destination. On iOS, the download first completes in a temporary location and the file is moved into place only after success, so no file is left behind when the request fails.

Returns:

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

A promise that resolves to the downloaded file. When the server responds with a non-2xx HTTP status, the promise rejects with an UnableToDownload error whose message includes the status code. No file is created in that scenario.

Example

const file = await File.downloadFileAsync("https://example.com/image.png", new Directory(Paths.document));

`info(options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | options(optional) | [InfoOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#infooptions) |

Retrieves an object containing properties of a file

Returns:

[FileInfo](https://docs.expo.dev/versions/latest/sdk/filesystem#fileinfo)

An object with file metadata (for example, size, creation date, and so on).

`move(destination)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | destination | [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) |

Moves a directory. Updates the uri property that now points to the new location.

Returns:

void

`open()`

Android

iOS

tvOS

Returns A FileHandle object that can be used to read and write data to the file.

Returns:

[FileHandle](https://docs.expo.dev/versions/latest/sdk/filesystem#filehandle)

`pickFileAsync(initialUri, mimeType)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | initialUri(optional) | string | An optional URI pointing to an initial folder on which the file picker is opened. | | mimeType(optional) | string | A mime type that is used to filter out files that can be picked out. |

A static method that opens a file picker to select a single file of specified type. On iOS, it returns a temporary copy of the file leaving the original file untouched.

Selecting multiple files is not supported yet.

Returns:

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

A File instance or an array of File instances.

`readableStream()`

Android

iOS

tvOS

Returns:

[ReadableStream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) <[Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) <[ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) >>

`rename(newName)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | newName | string |

Renames a file.

Returns:

void

`slice(start, end, contentType)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | start(optional) | number | | end(optional) | number | | contentType(optional) | string |

The slice() method of the Blob interface creates and returns a new Blob object which contains data from a subset of the blob on which it's called.

MDN Reference

Returns:

[Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob)

`stream()`

Android

iOS

tvOS

The stream() method of the Blob interface returns a ReadableStream which upon reading returns the data contained within the Blob.

MDN Reference

Returns:

`text()`

Android

iOS

tvOS

Retrieves text from the file.

Returns:

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

A promise that resolves with the contents of the file as string.

`textSync()`

Android

iOS

tvOS

Retrieves text from the file.

Returns:

string

The contents of the file as string.

`writableStream()`

Android

iOS

tvOS

Returns:

[WritableStream](https://developer.mozilla.org/en-US/docs/Web/API/WritableStream) <[Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) >

`write(content)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | content | string \| [Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) | The content to write into the file. |

Writes content to the file.

Returns:

void

`FileHandle`

Android

iOS

tvOS

FileHandle Properties

`offset`

Android

iOS

tvOS

Literal type: union

A property that indicates the current byte offset in the file. Calling readBytes or writeBytes will read or write a specified amount of bytes starting from this offset. The offset is incremented by the number of bytes read or written. The offset can be set to any value within the file size. If the offset is set to a value greater than the file size, the next write operation will append data to the end of the file. Null if the file handle is closed.

Acceptable values are: null | number

`size`

Android

iOS

tvOS

Literal type: union

A size of the file in bytes or null if the file handle is closed.

Acceptable values are: null | number

FileHandle Methods

`close()`

Android

iOS

tvOS

Closes the file handle. This allows the file to be deleted, moved or read by a different process. Subsequent calls to readBytes or writeBytes will throw an error.

Returns:

void

`readBytes(length)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | length | number | The number of bytes to read. |

Reads the specified amount of bytes from the file at the current offset.

Returns:

[Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) <[ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) >

`writeBytes(bytes)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | bytes | [Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) | A Uint8Array array containing bytes to write. |

Writes the specified bytes to the file at the current offset.

Returns:

void

`Paths`

Android

iOS

tvOS

Type: Class extends PathUtilities

Paths Properties

`appleSharedContainers`

Android

iOS

tvOS

Type: Record<string, [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) >

`availableDiskSpace`

Android

iOS

tvOS

Type: number

A property that represents the available space on device's internal storage, represented in bytes.

`bundle`

Android

iOS

tvOS

Type: [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory)

A property containing the bundle directory – the directory where assets bundled with the application are stored.

`cache`

Android

iOS

tvOS

Type: [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory)

A property containing the cache directory – a place to store files that can be deleted by the system when the device runs low on storage.

`document`

Android

iOS

tvOS

Type: [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory)

A property containing the document directory – a place to store files that are safe from being deleted by the system.

`totalDiskSpace`

Android

iOS

tvOS

Type: number

A property that represents the total space on device's internal storage, represented in bytes.

Paths Methods

`basename(path, ext)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | path | string \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) \| [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) | The path to get the base name from. | | ext(optional) | string | An optional file extension. |

Returns the base name of a path.

Returns:

string

A string representing the base name.

`dirname(path)`

Android

iOS

tvOS

Returns the directory name of a path.

Returns:

string

A string representing the directory name.

`extname(path)`

Android

iOS

tvOS

Returns the extension of a path.

Returns:

string

A string representing the extension.

`info(...uris)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | ...uris | string[] |

Returns an object that indicates if the specified path represents a directory.

Returns:

[PathInfo](https://docs.expo.dev/versions/latest/sdk/filesystem#pathinfo)

`isAbsolute(path)`

Android

iOS

tvOS

Checks if a path is absolute.

Returns:

boolean

true if the path is absolute, false otherwise.

`join(...paths)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | ...paths | (string \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) \| [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) )[] | An array of path segments. |

Joins path segments into a single path.

Returns:

string

A string representing the joined path.

`normalize(path)`

Android

iOS

tvOS

Normalizes a path.

Returns:

string

A string representing the normalized path.

`parse(path)`

Android

iOS

tvOS

Parses a path into its components.

Returns:

{ base: string, dir: string, ext: string, name: string, root: string }

An object containing the parsed path components.

`relative(from, to)`

Android

iOS

tvOS

| Parameter | Type | Description | | --- | --- | --- | | from | string \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) \| [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) | The base path. | | to | string \| [File](https://docs.expo.dev/versions/latest/sdk/filesystem#file) \| [Directory](https://docs.expo.dev/versions/latest/sdk/filesystem#directory) | The relative path. |

Resolves a relative path to an absolute path.

Returns:

string

A string representing the resolved path.

Methods

Deprecated Use new File().copy() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.copyAsync(options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | options | [RelocatingOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#relocatingoptions) |

Returns:

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

Deprecated Import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.createDownloadResumable(uri, fileUri, options, callback, resumeData)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | uri | string | | fileUri | string | | options(optional) | [DownloadOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#downloadoptions) | | callback(optional) | [FileSystemNetworkTaskProgressCallback](https://docs.expo.dev/versions/latest/sdk/filesystem#filesystemnetworktaskprogresscallback) <[DownloadProgressData](https://docs.expo.dev/versions/latest/sdk/filesystem#downloadprogressdata) > | | resumeData(optional) | string |

Returns:

any

Deprecated Import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.createUploadTask(url, fileUri, options, callback)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | url | string | | fileUri | string | | options(optional) | [FileSystemUploadOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#filesystemuploadoptions) | | callback(optional) | [FileSystemNetworkTaskProgressCallback](https://docs.expo.dev/versions/latest/sdk/filesystem#filesystemnetworktaskprogresscallback) <[UploadProgressData](https://docs.expo.dev/versions/latest/sdk/filesystem#uploadprogressdata) > |

Returns:

any

Deprecated Use new File().delete() or new Directory().delete() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.deleteAsync(fileUri, options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string | | options(optional) | [DeletingOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#deletingoptions) |

Returns:

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

Deprecated

`FileSystem.deleteLegacyDocumentDirectoryAndroid()`

Android

iOS

tvOS

Returns:

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

Deprecated Use File.downloadFileAsync or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.downloadAsync(uri, fileUri, options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | uri | string | | fileUri | string | | options(optional) | [DownloadOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#downloadoptions) |

Returns:

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

Deprecated Import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.getContentUriAsync(fileUri)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string |

Returns:

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

Deprecated Use Paths.availableDiskSpace or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.getFreeDiskStorageAsync()`

Android

iOS

tvOS

Returns:

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

Deprecated Use new File().info or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.getInfoAsync(fileUri, options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string | | options(optional) | [InfoOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#infooptions) |

Returns:

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

Deprecated Use Paths.totalDiskSpace or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.getTotalDiskCapacityAsync()`

Android

iOS

tvOS

Returns:

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

Deprecated Use new Directory().create() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.makeDirectoryAsync(fileUri, options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string | | options(optional) | [MakeDirectoryOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#makedirectoryoptions) |

Returns:

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

Deprecated Use new File().move() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.moveAsync(options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | options | [RelocatingOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#relocatingoptions) |

Returns:

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

Deprecated Use new File().text() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.readAsStringAsync(fileUri, options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string | | options(optional) | [ReadingOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#readingoptions) |

Returns:

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

Deprecated Use new Directory().list() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.readDirectoryAsync(fileUri)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string |

Returns:

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

Deprecated Use @expo/fetch or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.uploadAsync(url, fileUri, options)`

Android

iOS

tvOS

Returns:

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

Deprecated Use new File().write() or import this method from expo-file-system/legacy. This method will throw in runtime.

`FileSystem.writeAsStringAsync(fileUri, contents, options)`

Android

iOS

tvOS

| Parameter | Type | | --- | --- | | fileUri | string | | contents | string | | options(optional) | [WritingOptions](https://docs.expo.dev/versions/latest/sdk/filesystem#writingoptions) |

Returns:

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

Types

`DirectoryCreateOptions`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | idempotent(optional) | boolean | This flag controls whether the create operation is idempotent (safe to call multiple times without error). If true, creating a file or directory that already exists will succeed silently. If false, an error will be thrown when the target already exists. Default:false | | intermediates(optional) | boolean | Whether to create intermediate directories if they do not exist. Default:false | | overwrite(optional) | boolean | Whether to overwrite the directory if it exists. Default:false |

`DirectoryInfo`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | creationTime(optional) | number | A creation time of the directory expressed in milliseconds since epoch. Returns null if the Android version is earlier than API 26. | | exists | boolean | Indicates whether the directory exists. | | files(optional) | string[] | A list of file names contained within a directory. | | modificationTime(optional) | number | The last modification time of the directory expressed in milliseconds since epoch. | | size(optional) | number | The size of the file in bytes. | | uri(optional) | string | A file:// URI pointing to the directory. |

`DownloadOptions`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | headers(optional) | undefined | The headers to send with the request. | | idempotent(optional) | boolean | This flag controls whether the download operation is idempotent (safe to call multiple times without error). If true, downloading a file that already exists overwrites the previous one. If false, an error is thrown when the target file already exists. Default:false |

`FileCreateOptions`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | intermediates(optional) | boolean | Whether to create intermediate directories if they do not exist. Default:false | | overwrite(optional) | boolean | Whether to overwrite the file if it exists. Default:false |

`FileInfo`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | creationTime(optional) | number | A creation time of the file expressed in milliseconds since epoch. Returns null if the Android version is earlier than API 26. | | exists | boolean | Indicates whether the file exists. | | md5(optional) | string | Present if the md5 option was truthy. Contains the MD5 hash of the file. | | modificationTime(optional) | number | The last modification time of the file expressed in milliseconds since epoch. | | size(optional) | number | The size of the file in bytes. | | uri(optional) | string | A file:// URI pointing to the file. This is the same as the fileUri input parameter. |

`InfoOptions`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | md5(optional) | boolean | Whether to return the MD5 hash of the file. Default:false |

`PathInfo`

Android

iOS

tvOS

| Property | Type | Description | | --- | --- | --- | | exists | boolean | Indicates whether the path exists. Returns true if it exists; false if the path does not exist or if there is no read permission. | | isDirectory | boolean \| null | Indicates whether the path is a directory. Returns true or false if the path exists; otherwise, returns null. |