@dr.pogodin/react-native-fs
Advanced tools
File system access for React Native applications for Android, iOS, Mac (Catalyst), and Windows platforms. Supports both new and old RN architectures.
begin callback in DownloadFileOptionsT.progress callback in DownloadFileOptionsT.begin callback argument in UploadFileOptionsT.files elements in
UploadFileOptionsT objects.progress callback
argument in UploadFileOptionsT, and a few other places.Just install & use:
$ npm install --save @dr.pogodin/react-native-fs
Note: Windows auto-link command (at least as it was needed for example project to install the lib hosted in the parent folder):
npx react-native autolink-windows --sln "windows\ReactNativeFsExample.sln" --proj "windows\ReactNativeFsExample\ReactNativeFsExample.vcxproj"
This project is a fork of the upstream react-native-fs library, which has been abandoned by its owners and maintainers. This forks aims to keep the library on par with the latest React Native standards, with support of the New Architecture, backward compatibility with the Old Architecture; and to further develop the library according to the best industry practices.
To migrate from the legacy react-native-fs install this fork_
npm install --save @dr.pogodin/react-native-fs
then upgrade its imports in the code:
// The legacy RNFS was imported like this:
import RNFS from 'react-native-fs';
// Instead, this fork should be imported like this:
import * as RNFS from '@dr.pogodin/react-native-fs';
// or (preferrably) you should import separate constants / functions you need
// like:
import {
TemporaryDirectoryPath,
writeFile,
} from '@dr.pogodin/react-native-fs';
ROADMAP:
v2.22.0 of this library is, presumably, a drop-in replacement for the latest (v2.20.0) release of the original, upstream react-native-fs (beside the need to upgrade host project to the lates RN v0.73). It has matching functionality and API, with just a handfull of internal fixes, and a few additions.
In further versions, v2.X.Y, we'll be taking care of improvements, and optimizations of existing functionality, as well as adding new APIs, and deprecating old ones (without yet dropping them out of the codebase), with the ultimate goal to release v3 version of the library.
The aims for v3 release are the following:
Background downloads in iOS require a bit of a setup.
First, in your AppDelegate.m file add the following:
#import <RNFSBackgroundDownloads.h>
...
- (void)application:(UIApplication *)application
handleEventsForBackgroundURLSession:(NSString *)identifier
completionHandler:(void (^)())completionHandler
{
[RNFSBackgroundDownloads
setCompletionHandlerForIdentifier:identifier
completionHandler:completionHandler];
}
The handleEventsForBackgroundURLSession method is called when a background download is done and your app is not in the foreground.
We need to pass the completionHandler to RNFS along with its identifier.
The JavaScript will continue to work as usual when the download is done but now you must call RNFS.completeHandlerIOS(jobId) when you're done handling the download (show a notification etc.)
BE AWARE! iOS will give about 30 sec. to run your code after handleEventsForBackgroundURLSession is called and until completionHandler
is triggered so don't do anything that might take a long time (like unzipping), you will be able to do it after the user re-launces the app,
otherwide iOS will terminate your app.
These are legacy examples, and should be revised, there is an Example app in the /example folder of the codebase, you probably should rather check it than these examples.
// require the module
var RNFS = require('react-native-fs');
// get a list of files and directories in the main bundle
RNFS.readDir(RNFS.MainBundlePath) // On Android, use "RNFS.DocumentDirectoryPath" (MainBundlePath is not defined)
.then((result) => {
console.log('GOT RESULT', result);
// stat the first file
return Promise.all([RNFS.stat(result[0].path), result[0].path]);
})
.then((statResult) => {
if (statResult[0].isFile()) {
// if we have a file, read it
return RNFS.readFile(statResult[1], 'utf8');
}
return 'no file';
})
.then((contents) => {
// log the file contents
console.log(contents);
})
.catch((err) => {
console.log(err.message, err.code);
});
// require the module
var RNFS = require('react-native-fs');
// create a path you want to write to
// :warning: on iOS, you cannot write into `RNFS.MainBundlePath`,
// but `RNFS.DocumentDirectoryPath` exists on both platforms and is writable
var path = RNFS.DocumentDirectoryPath + '/test.txt';
// write the file
RNFS.writeFile(path, 'Lorem ipsum dolor sit amet', 'utf8')
.then((success) => {
console.log('FILE WRITTEN!');
})
.catch((err) => {
console.log(err.message);
});
// create a path you want to delete
var path = RNFS.DocumentDirectoryPath + '/test.txt';
return RNFS.unlink(path)
.then(() => {
console.log('FILE DELETED');
})
// `unlink` will throw an error, if the item to unlink does not exist
.catch((err) => {
console.log(err.message);
});
// require the module
var RNFS = require('react-native-fs');
var uploadUrl = 'http://requestb.in/XXXXXXX'; // For testing purposes, go to http://requestb.in/ and create your own link
// create an array of objects of the files you want to upload
var files = [
{
name: 'test1',
filename: 'test1.w4a',
filepath: RNFS.DocumentDirectoryPath + '/test1.w4a',
filetype: 'audio/x-m4a'
}, {
name: 'test2',
filename: 'test2.w4a',
filepath: RNFS.DocumentDirectoryPath + '/test2.w4a',
filetype: 'audio/x-m4a'
}
];
var upload
= (response) => {
var jobId = response.jobId;
console.log('UPLOAD HAS BEGUN! JobId: ' + jobId);
};
var uploadProgress = (response) => {
var percentage = Math.floor((response.totalBytesSent/response.totalBytesExpectedToSend) * 100);
console.log('UPLOAD IS ' + percentage + '% DONE!');
};
// upload files
RNFS.uploadFiles({
toUrl: uploadUrl,
files: files,
method: 'POST',
headers: {
'Accept': 'application/json',
},
fields: {
'hello': 'world',
},
begin: uploadBegin,
progress: uploadProgress
}).promise.then((response) => {
if (response.statusCode == 200) {
console.log('FILES UPLOADED!'); // response.statusCode, response.headers, response.body
} else {
console.log('SERVER ERROR');
}
})
.catch((err) => {
if(err.description === "cancelled") {
// cancelled by user
}
console.log(err);
});
const CachesDirectoryPath: string;
VERIFIED: Android, iOS, macOS, Windows.
The absolute path to the caches directory.
const DocumentDirectoryPath: string;
VERIFIED: Android, iOS, macOS, Windows.
The absolute path to the document directory.
IMPORTANT: DocumentDirectoryPath (iOS) will include an ID in the path that changes each build e.g ...Application/BCE32988-4C51-483B-892B-16671E3771C2/Documents.
Use relative paths and resolve the full path at runtime to avoid files not being found on new builds.
const DownloadDirectoryPath: string;
VERIFIED: Android, Windows. NOT SUPPORTED: iOS, macOS.
The absolute path to the download directory (on android and Windows only).
const ExternalCachesDirectoryPath: string;
VERIFIED: Android, Windows (empty?). NOT SUPPORTED: iOS, macOS.
The absolute path to the external caches directory (android only).
const ExternalDirectoryPath: string;
VERIFIED: Android, iOS (empty?), macOS (empty?), Windows.
The absolute path to the external files, shared directory (android only).
const ExternalStorageDirectoryPath: string;
VERIFIED: Android, iOS (empty?), macOS (empty?), Windows (empty?).
The absolute path to the external storage, shared directory (android only).
BEWARE: When using ExternalStorageDirectoryPath it's necessary to request permissions (on Android) to read and write on the external storage, here an example: React Native Offical Doc
const LibraryDirectoryPath: string;
VERIFIED: iOS, macOS, Windows (empty?). NOT SUPPORTED: Android.
The absolute path to the NSLibraryDirectory (iOS only).
const MainBundlePath: string;
VERIFIED: iOS, macOS, Windows. NOT SUPPORTED: Android.
The absolute path to the main bundle directory (not available on Android).
const PicturesDirectoryPath: string;
VERIFIED: Android, Windows. NOT SUPPORTED: iOS, macOS.
The absolute path to the pictures directory.
const RoamingDirectoryPath: string;
VERIFIED: Windows. NOT SUPPORTED: Android, iOS, macOS.
The absolute path to the roaming directory (Windows only).
const TemporaryDirectoryPath: string;
VERIFIED: Android, iOS, macOS, Windows.
The absolute path to the temporary directory (falls back to Caching-Directory on Android).
BEWARE: The trailing slash might be inconsistent in this path! At the very least, on Android this constant does not have a slash in the end; but on iOS (new arch) it has it. It is something to unify in future.
function appendFile(filepath: string, contents: string, encoding?: string): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows.
Appends content to a file.
filepath — string — File path.contents — string — The content to add.encoding — EncodingT — Optional. Encoding.function completeHandlerIOS(jobId: number): void;
VERIFIED: well... not really verified, but is callable on iOS.
iOS only. For use when using background downloads, tell iOS you are done handling a completed download.
Read more about background downloads in the Background Downloads Tutorial (iOS) section.
function copyAssetsFileIOS(
imageUri: string,
destPath: string,
width: number,
height: number,
scale?: number,
compression?: number,
resizeMode?: string,
): Promise<string>;
BEWARE: After ensuring this method gets called correctly on iOS, calling it just crashes the example app for me. Though, I don't have much interest to dig into it now (not for free :)
iOS only.
Not available on Mac Catalyst.
Reads an image file from Camera Roll and writes to destPath. This method
assumes the image file to be JPEG file.
This method will download the original from iCloud if necessary.
One can use this method also to create a thumbNail from a video in a specific size. Currently it is impossible to specify a concrete position, the OS will decide which Thumbnail you'll get then. To copy a video from assets-library and save it as a mp4-file, refer to copyAssetsVideoIOS.
Further information: https://developer.apple.com/reference/photos/phimagemanager/1616964-requestimageforasset The promise will on success return the final destination of the file, as it was defined in the destPath-parameter.
imageUri — string — URI of a file in Camera Roll.
Can be either of the following formats:
ph://CC95F08C-88C3-4012-9D6D-64A413D254B3/L0/001assets-library://asset/asset.JPG?id=CC95F08C-88C3-4012-9D6D-64A413D254B3&ext=JPGdestPath — string — Destination to which the copied file
will be saved, e.g. RNFS.TemporaryDirectoryPath + 'example.jpg'.
width — number — Copied file's image width will be resized
to width. If 0 is provided, width won't be resized.
height — number — Copied file's image height will be resized
to height. If 0 is provided, height won't be resized.
scale — number | undefined — Optional. Copied file's
image will be scaled proportional to scale factor from width x height.
If both width and height are 0, the image won't scale. Range is [0.0, 1.0]
and default is 1.0.
compression — number | undefined — Optional. Quality of
copied file's image. The value 0.0 represents the maximum compression
(or lowest quality) while the value 1.0 represents the least compression
(or best quality). Range is [0.0, 1.0] and default is 1.0.
resizeMode — string | undefined — Optional.
If resizeMode is 'contain', copied file's image will be scaled so that its
larger dimension fits width x height. If resizeMode is other value than
'contain', the image will be scaled so that it completely fills
width x height. Default is 'contain'.
Refer to PHImageContentMode.
Resolves to string — Copied file's URI.
function copyAssetsVideoIOS(videoUri: string, destPath: string): Promise<string>;
BEWARE: Similarly to copyAssetsFileIOS() I believe it gets correctly called on iOS, but it crashes the example app in my naive test. Perhaps I use it wrong, or something should be patched in the original implementation.
Not available on Mac Catalyst.
Copies a video from assets-library, that is prefixed with 'assets-library://asset/asset.MOV?...' to a specific destination.
videoUri — string — Video URI.destPath — string — Destination.function copyFile(from: string, into: string, options?: FileOptionsT): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows.
Copies a file to a new destination. Throws if called on a directory.
Note: On Android and Windows copyFile() will overwrite destPath if it
already exists. On iOS an error will be thrown if the file already exists.
— beware, this has not been verified yet.
BEWARE: On Android copyFile() throws if called on a folder; on other platforms it does not throw, but it has not been verified yet, if it actually copies a folder with all its content there.
from — string — Source path.into — string — Destination path.options — FileOptionsT | undefined — Optional. Additional
settings. beware, it has not been verified they work, yet.function copyFileAssets(from: string, into: string): Promise<void>
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Copies Android app's asset(s) to the specified destination.
If from points to a file, this function assumes into is a file path as well,
and it copies the asset to that destination, overwriting the existing file at
that destination, if any.
If from points to a folder, this function assumes into is a folder path
as well, and it recursively copies the content of from into that destination,
preserving the folder structure of copied assets, and overwriting existing files
in the destination in case of conflicts. It does not clean the destination prior
to copying into it, and it cannot overwrite files by folders and vice-versa.
If into does not exist, it will be created, assuming its parent folder
does exist (i.e. it does not attempt to create entire path as mkdir() does).
from — string — Source path, relative to the root assets
folder. Can be empty to refer the root assets folder itself.
into — string — Destination path.
Resolves once completed.
function copyFileRes(filename: string, destPath: string): Promise<void>
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Copies the file named filename in the Android app's res folder
and copies it to the given destPath path. res/drawable is used as
the source parent folder for image files, res/raw for everything else.
BEWARE: It will overwrite destPath if it already exists.
filename — string — Resource name.destPath — string — Destination.copyFolder(from: string, into: string): Promise<void>;
VERIFIED: Windows NOT SUPPORTED: Android, iOS, macOS
Windows only. Copies content to a new location in a Windows-efficient way, compared to copyFile().
from — string — Source location.into — string — Destination location.function downloadFile(options: DownloadFileOptionsT): {
jobId: number;
promise: Promise<DownloadResultT>;
};
VERIFIED: Android, iOS, macOS, Windows
BEWARE: Only basic functionality has been verified.
Downloads a file from options.fromUrl to options.toFile. It Will overwrite
any previously existing file.
options — DownloadFileOptionsT — Download settings.jobId number (can be used to manage in-progress
download by corresponding functions) and promise resolving to DownloadResultT
once the download is completed.function exists(path: string): Promise<boolean>;
VERIFIED: Android, iOS, macOS, Windows.
Checks if an item exists at the given path.
path — string — Path.function existsAssets(path: string): Promise<boolean>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Checks if an item exists at the given path in the Android assets folder.
path — string — Path, relative to the root of the Android
assets folder.function existsRes(filename: string): Promise<boolean>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Check if the specified resource exists.
res/drawable is used as the parent folder for image files,
res/raw for everything else.
filename — string — Resource name.function getAllExternalFilesDirs(): Promise<string[]>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Returns an array with the absolute paths to application-specific directories on all shared/external storage devices where the application can place persistent files it owns.
function getFSInfo(): Promise<FSInfoResultT>;
VERIFIED: Android, iOS, macOS, Windows.
Provides information about free and total file system space.
function hash(path: string, algorithm: string): Promise<string>;
VERIFIED: Android, iOS, macOS, Windows.
Calculates file's hash.
path — string — File path.algorithm — string — One of md5, sha1,
sha224 (currently it does not work on Windows!),
sha256, sha384, sha512.function isResumable(jobId: number): Promise<bool>;
iOS only. Check if the the download job with this ID is resumable with resumeDownload().
Example:
if (await RNFS.isResumable(jobId) {
RNFS.resumeDownload(jobId)
}
jobId — number — Download job ID.function mkdir(path: string, options?: MkdirOptionsT): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows.
Creates folder(s) at path, and does not throw if already exists (similar to
mkdir -p in Linux).
path — string — Path to create.options — MkdirOptionsT | undefined — Optional.
Additional parameters.function moveFile(from: string, into: string): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows.
Moves an item (a file, or a folder with files) to a new location. This is more performant than reading and then re-writing the file data because the move is done natively and the data doesn't have to be copied or cross the bridge.
Note: Overwrites existing file in Windows — To be verified, how does it behave on other systems, and whether it really overwrites items on Windows?
BEWARE: On Windows it currently does not allow moving folders with files, on other platforms it works fine.
from — string — Old path of the item.into — string — New path of the item.function pathForGroup(groupIdentifier: string): Promise<string>;
VERIFIED: iOS.
iOS only. Returns the absolute path to the directory shared for all applications with the same security group identifier. This directory can be used to to share files between application of the same developer.
Invalid group identifier will cause a rejection.
For more information read the Adding an App to an App Group section.
groupIdentifier — string — Any value from
the com.apple.security.application-groups entitlements list.function pickFile(options?: PickFileOptionsT): Promise<string[]>;
SUPPORTED: Android, iOS, macOS. NOT YET SUPPORTED: Windows.
Prompts the user to select file(s) using a platform-provided file picker UI, which also allows to access files outside the app sandbox.
BEWARE: On macOS (Catalyst) for this function to work you MUST go to Signing & Capabilities settings of your project, and inside its App Sandbox section to set File Access > User Selected Files to Read/Write value (with just Read the file picker on macOS opens and seemingly works, but rather than returning the picked up URL, it signals the operation has been cancelled). If it is left at the default None value the call to pickFile() will crash the app.
options — PickFileOptionsT — Optional parameters. By default,
this function allows user to select a single file of any kind.
Resolves to a string array — URIs (paths) of user-selected files, allowing a direct access to them with other methods in this library (e.g. readFile()), even if the file is outside the app sandbox.
NOTE: On iOS & macOS it resolve to special values with the format
«bookmark://<BASE64_ENCODED_STRING>», rather than normal URIs.
It is necessary for the support of security scopes
(see Bookmarks and Security Scopes) in library methods. The «<BASE64_ENCODED_STRING>»
in this case is a Base64-encoded binary representation of the URL bookmark,
along with its security scope data. Other methods of the library are expected
to automatically handle such special URIs as needed.
BEWARE: It has not been thoroughly verified yet that all library methods support these «Bookmark URLs» correctly. The expected error in such case is a failure to access the URLs as non-existing.
function read(path: string, length = 0, position = 0, encodingOrOptions?: EncodingT | ReadFileOptionsT): Promise<string>;
VERIFIED: Android, iOS, macOS, Windows.
Reads length bytes from the given position of a file.
BEWARE: On Android and Windows read() called with zero length and position
resolves to empty string; however on other platforms it resolves to the entire
file content (same as readFile()). This behavior has been inherited from
the legacy RNFS implementation, and is to be corrected in future.
Note: To read entire file at once consider to use readFile() instead.
Note: No matter the encoding, this function will always read the specified
number of bytes from the given position, and then transform that byte chunk
into a string using the given encoding; that is in constrast of, say, reading
the given number of characters, if utf8 is given.
path — string — File path.length — number | undefined — Optional. The number of
bytes to read. Defaults 0.position — number | undefined — Optional. The starting
read position, in bytes. Defaults 0.encodingOrOptions — EncodingT | ReadFileOptionsT | undefined
— Optional. The encoding to use, or additional read options (currently,
the encoding is the only option anyway). Defaults utf8.function readdir(path: string): Promise<string[]>;
VERIFIED: Android, iOS, macOS.
Lists the content of given folder (names only — NodeJS-style). Note the
lowercase d in the name, unlike in readDir().
BEWARE: There is no guarantees about the sort order of resolved listing.
path — string — Folder path.function readDir(path: string): Promise<ReadDirItem[]>;
VERIFIED: Android, iOS, macOS, Windows.
Lists the content of given absolute path.
BEWARE: There is no guarantees about the sort order of resolved listing.
BEWARE: On Windows the isDirectory() and isFile() methods of result
currently return false for all items; also size value in the result is
platform dependent for directories.
path — string — Path.function readDirAssets(path: string): Promise<ReadDirItem[]>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
(Android only) Lists the content of a folder at the given path inside
the Android assets folder.
path — string — Folder path, relative to the root of
the assets folder.function readFile(path: string, encodingOrOptions?: EncodingT | ReadFileOptionsT): Promise<string>;
VERIFIED: Android, iOS, macOS, Windows.
Reads the file at path and return its content as a string.
Note: To read a selected fragment of the file see read().
Note: For base64 encoding this function will return file content encoded
into Base64 format; for ascii it will fill each character of the result string
with the code of corresponding byte in the file; and for utf8 (default)
it will assume the source file is UTF8-encoded, and it will decode it into
the result string (thus each result character will be corresponding to a group
of 1-to-4 bytes of the source file).
BEWARE: You will take quite a performance hit if you are reading big files.
path — string — File path.encoding — EncodingT | ReadFileOptionsT — Optional.
File encoding, or extra options.function readFileAssets(path: string, encoding?: EncodingT | ReadFileOptionsT): Promise<string>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Reads the file at path in the Android app's assets folder
and return its contents. encoding can be one of utf8 (default), ascii,
base64. Use base64 for reading binary files.
path — string — Asset path.encoding — EncodingT | ReadFileOptionsT | undefined —
Optional. Encoding, or extra options object, which currently only supports
specifying the encoding.function readFileRes(filename: string, encoding?: EncodingT): Promise<string>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Reads the file named filename in the Android app's res folder
and return contents. Only the file name (not folder) needs to be specified.
Original docs say: The file type will be detected from the extension and
automatically located within res/drawable (for image files) or res/raw
(for everything else). Good luck with it. The test in the example app does not
work if the file extension is not included into the filename... but perhaps
I've overlooked something.
filename — string — Resouce file name.encoding — EncodingT — Optional Encdoing.function resumeDownload(jobId: number): void;
iOS only. Resume the current download job with this ID.
jobId — number — Download job ID.function scanFile(path: string): Promise<string | null>;
VERIFIED: Android. NOT SUPPORTED: iOS, macOS, Windows.
Android-only. Scan the file using Media Scanner.
path — string — Path of the file to scan.function stat(path: string): Promise<StatResultT>;
VERIFIED: Android, iOS, macOS, Windows.
Stats an item at path. If the path is linked to a virtual file, for example
Android Content URI, the originalPath can be used to find the pointed file
path (beware — this has not been verified yet).
BEWARE: On Windows a bunch of stuff in the response is currently not compatible
with the specs — size is a string rather than number, isDirectory() and isFile()
do not work (always return false), etc. Also on Windows, even with those defects
accounted for the test for this function tends to randomly fail on a regular basis.
It thus requires more troubleshooting, but it is not a priority for now.
path — string — Item path.function stopDownload(jobId: number): void;
VERIFIED: Android, iOS.
Aborts a file download job. The partial file will remain on the filesystem, and the promise returned from the aborted downloadFile() call will reject with an error.
jobId — number — Download job ID (see downloadFile()).function stopUpload(jobId: number): void;
VERIFIED: iOS.
iOS only. Abort the current upload job with given ID.
NOTE: Unlike stopDownload() it does not cause the pending upload promise to reject. Perhaps, we'll change it in future to behave similarly.
jobId — number — Upload job ID.function touch(filepath: string, mtime?: Date, ctime?: Date): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows.
Alters creation and modification timestamps of the given file.
filepath — string — File path.mtime — Date | undefined — Optional. Modification
timestamp.ctime — Date | undefined — Optional. Creation timestamp.
It is supported on iOS and Windows; Android always sets both timestamps equal
mtime.function unlink(path: string): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows.
Unlinks (removes) the item at path. If the item does not exist, an error will
be thrown. Also recursively deletes directories (works like Linux rm -rf).
path — string — Item path.function uploadFiles(options: UploadFileOptionsT): {
jobId: number;
promise: Promise<UploadResultT>;
}
VERIFIED: Android, iOS, macOS, Windows
Uploads files to a remote location.
BEWARE: Only the most basic upload functionality has been tested so far in this library fork.
options — UploadFileOptionsT — Upload settings.
Returns an object holding jobId number (can be used to manage
in-progress download by corresponding functions) and promise resolving
to UploadResultT once the download is completed.
function write(filepath: string, contents: string, position?: number, encoding?: EncodingT): Promise<void>;
VERIFIED: Android, iOS, macOS, Windows
BEWARE: On Windows it seems to work differently from other platforms,
throwing if attempting to write to a non-existing file.
Writes content to a file at the given random access position.
filepath — string — File path.contents — string — Content to write.position — number | undefined — Write position.
If undefined or -1 the contents is appended to the end of the file.encoding — EncodingT — Write encoding.function writeFile(path: string, content: string, encodingOrOptions?: EncodingT | WriteFileOptionsT): Promise<void>
VERIFIED: Android, iOS, macOS, Windows.
Write the content to the file at path, overwritting it if exists already.
NOTE: With base64 encoding value this function will assume that given
content is Base64-encoded already, and it will be decoded into the file;
for ascii encoding each character of content will be written to one byte
in the file, and the function will fail if any character is outside
the U+0000 to U+00FF range (keep in mind, that regular JS strings have
two-byte characters); and for utf8 encoding (default) it will encode
content characters (which can be from U+0000 to U+FFFF in this case)
into the corresponding UTF8 code (i.e. each source character will be
turned into a group of 1-to-4 bytes in the written file).
path — string — File path.content — string — Data to write into the file.encodingOrOptions — EncodingT | WriteFileOptionsT — Data
encoding, or extra options.type DownloadBeginCallbackResultT = {
jobId: number;
statusCode: number;
contentLength: number;
headers: Headers;
};
The type of argument passed to begin callback in DownloadFileOptionsT.
jobId — number — The download job ID, required if one wishes
to cancel the download. See stopDownload().statusCode — number — The HTTP status code.contentLength — number — The total size in bytes of
the download resource.headers — StringMapT — The HTTP response headers from
the server.type DownloadFileOptions = {
fromUrl: string;
toFile: string;
headers?: StringMapT;
background?: boolean;
discretionary?: boolean;
cacheable?: boolean;
progressInterval?: number;
progressDivider?: number;
begin?: (res: DownloadBeginCallbackResultT) => void;
progress?: (res: DownloadProgressCallbackResultT) => void;
resumable?: () => void;
connectionTimeout?: number;
readTimeout?: number;
backgroundTimeout?: number;
};
The type of options argument of downloadFile().
fromUrl — string — URL to download file from.
toFile — string — Local filesystem path to save the file to.
headers — StringMapT — Optional. An object of headers to be
passed to the server.
background — boolean — Optional. Continue the download in
the background after the app terminates (iOS only).
See Background Downloads Tutorial (iOS).
Defaults false.
discretionary — boolean — Optional. Allow the OS to control
the timing and speed of the download to improve perceived performance
(iOS only).
cacheable — boolean — Optional. Whether the download can be
stored in the shared NSURLCache (iOS only, defaults to true).
progressInterval — number Optional. If provided, the download
progress events will be emitted with the maximum frequency of progressInterval.
For example, if progressInterval = 100, you will not receive callbacks more
often than every 100th millisecond.
progressDivider — number Optional. If provided, the download
progress events are emitted at progressDivider number of steps.
For example, if progressDivider = 10, you will receive only ten callbacks
for this values of progress: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
Use it for performance issues.
If progressDivider = 0, you will receive all progressCallback calls,
default value is 0.
begin — (res: DownloadBeginCallbackResultT) => void —
Optional; required if progress prop provided. If provided, it is invoked
when download starts, once headers have been received, and it is passed
a single argument of DownloadBeginCallbackResultT type.
progress — (res: DownloadProgressCallbackResultT) => void —
Optional. If provided, it is being invoked continuously and passed in a single
argument of DownloadProgressCallbackResultT type.
resumable — () => void — Optional. iOS-only. If provided,
it is invoked when the download has stopped and and can be resumed using resumeDownload().
connectionTimeout — number — Optional. Only supported on
Android yet.
readTimeout — number Optional. Supported on Android and iOS.
backgroundTimeout — number — Optional. Maximum time
(in milliseconds) to download an entire resource (iOS only, useful for timing
out background downloads).
type DownloadProgressCallbackResultT = {
jobId: number;
contentLength: number;
bytesWritten: number;
};
The type of argument passed to the progress callback in DownloadFileOptionsT.
jobId — number The download job ID, required if one wishes
to cancel the download. See stopDownload().contentLength — number — The total size in bytes of
the download resource.bytesWritten — number — The number of bytes written to
the file so far.type DownloadResultT = {
jobId: number;
statusCode: number;
bytesWritten: number;
};
Return type of downloadFile().
jobId — number — The download job ID, required if one wishes
to cancel the download. See stopDownload().statusCode — number — The HTTP status code.bytesWritten — number — The number of bytes written to
the file.type EncodingT = 'ascii' | 'base64' | `utf8`;
Union of valid file encoding values.
type FileOptionsT = {
// iOS-specific.
NSFileProtectionKey?: string;
};
The type of additional options for copyFile().
NSFileProtectionKey — string | undefined — Optional.
iOS-only. See https://developer.apple.com/documentation/foundation/nsfileprotectionkeytype FSInfoResultT = {
freeSpace: number;
freeSpaceEx: number;
totalSpace: number;
totalSpaceEx: number;
};
The type of result resolved by getFSInfo().
freeSpace — number — Free storage space on the device,
in bytes.totalSpace — number — The total storage space on the device,
in bytes.BEWARE: The following values have been seen reported on Android, but they are not reported on iOS, probably neither on other systems, and they should be further checked / fixed.
freeSpaceEx — number — Free storage space in the external
storage, in bytes.totalSpaceEx — number — The total storage space in
the external storage, in bytes.type MkdirOptionsT = {
NSURLIsExcludedFromBackupKey?: boolean; // iOS only
};
Type of extra options argument for mkdir().
NSURLIsExcludedFromBackupKey — boolean | undefined —
(iOS only) The property can be provided to set this attribute on iOS platforms.
Apple will reject apps for storing offline cache data that does not have this
attribute.type PickFileOptionsT = {
mimeTypes?: string[];
};
Optional parameters for pickFile() function.
mimeTypes — string[] — Optional. An array of
MIME types
of files user is allowed to select. Defaults to ['*/*'] allowing to select
any file.type ReadDirAssetsResItemT = {
name: string;
path: string;
size: string;
isFile: () => boolean;
isDirectory: () => boolean;
};
Type of result elements returned by the readDirAssets() function.
name — string — Item name.path — string — Item path.size — string — Size in bytes. Note that the size of files
compressed during the creation of the APK (such as JSON files) cannot be
determined. size will be set to -1 in this case.isFile — () => boolean — Is this item a regular file?isDirectory — () => boolean — Is this item a directory?type ReadDirResItemT = {
ctime: Date | null;
mtime: Date;
name: string;
path: string;
size: number;
isFile: () => boolean;
isDirectory: () => boolean;
};
The type of objects returned by the readDir() function.
ctime — Date | null — Item creation date (iOS only;
null on other platforms).isDirectory — () => boolean — Evaluates true if item is
a folder; false otherwise.isFile — () => boolean — Evaluates true if item is
a file; false otherwise.mtime — Date — The last modified date of the item.name — string — Name of the item.path — string — Absolute path of the item.size — number — Item size in bytes.type ReadFileOptionsT = {
encoding?: EncodingT;
};
The type of extra options argument of the readFile() function.
encoding — EncodingT | undefined — Optional. File encoding.
Defaults utf8.type StatResultT = {
ctime: Date;
isDirectory: () => boolean;
isFile: () => boolean;
mode: undefined;
mtime: Date;
originalFilepath: string;
path: string;
size: number;
};
The type of result resolved by stat().
ctime — Date — Item's creation date.isDirectory — () => boolean — Evaluates true if the item
is a folder; false otherwise.isFile — () => boolean — Evaluates true if the item is
a file; false otherwise.mode — number | undefined — UNIX file mode; undefined
on platforms that currnetly do not support it (Android).mtime — Date — Item's last modification date.originalFilepath — string — (Android-only) In case
of content uri this is the pointed file path, otherwise is the same as path.path — string — Item path.size — number — Item size in bytes.type StringMapT = { [key: string]: string };
Just a simple string-to-string mapping.
type UploadBeginCallbackArgT = {
jobId: number;
};
The type of begin callback argument in UploadFileOptionsT.
jobId — number — The upload job ID, required if one wishes
to cancel the upload. See stopUpload().type UploadFileItemT = {
name?: string;
filename: string;
filepath: string;
filetype?: string;
};
The type of files elements in UploadFileOptionsT objects.
name — string | undefined — Optional Name of the file,
if not defined then filename is used.
filename — string — Name of file.
filepath — string — Path to file.
filetype — string | undefined — Optional. The mimetype
of the file to be uploaded, if not defined it will get mimetype from
filepath extension.
type UploadFileOptionsT = {
toUrl: string;
binaryStreamOnly?: boolean;
files: UploadFileItem[];
headers?: StringMapT;
fields?: StringMapT;
method?: string;
begin?: (res: UploadBeginCallbackArgT) => void;
progress?: (res: UploadProgressCallbackArgT) => void;
};
Type of options object in uploadFiles() function.
toUrl — string — URL to upload file to.
binaryStreamOnly — boolean | undefined — Optional.
Allow for binary data stream for file to be uploaded without extra headers.
Defaults false.
files — UploadFileItemT[] — An array of objects with the file
information to be uploaded.
headers — StringMapT | undefined — Optional. An object of
headers to be passed to the server.
fields — StringMapT | undefined — Optional. An object of
fields to be passed to the server.
method — string | undefined — Optional. Defaults POST,
supports POST and PUT.
begin — (res: UploadBeginCallbackArgT) => void —
Optional. If provided, it will be invoked once upon upload has begun.
progress — (res: UploadProgressCallbackArgT) => void —
Optional. If provided, it will be invoked continuously and passed a single
object of UploadProgressCallbackArgT type.
type UploadProgressCallbackArgT = {
jobId: number;
totalBytesExpectedToSend: number;
totalBytesSent: number;
};
The type of progress callback argument in UploadFileOptionsT.
Percentage can be computed easily by dividing totalBytesSent by
totalBytesExpectedToSend.
jobId — number — The upload job ID, required if one wishes
to cancel the upload. See stopUpload().totalBytesExpectedToSend number — The total number of bytes that
will be sent to the servertotalBytesSent — number — The number of bytes sent to
the servertype UploadResultT = {
jobId: number;
statusCode: number;
headers: StringMapT;
body: string;
};
The type of resolved uploadFiles() promise.
jobId — number — The upload job ID, required if one wishes
to cancel the upload. See stopUpload().
statusCode — number — The HTTP status code.
headers — StringMapT — The HTTP response headers from
the server.
body — string — The HTTP response body.
type WriteFileOptionsT = {
encoding?: EncodingT;
NSFileProtectionKey?: string;
};
The type of extra options argument of the writeFile() function.
encoding — EncodingT | undefined — Optional. File encoding
to use. Defaults utf8.NSFileProtectionKey — string | undefined — Optional.
iOS-only. See: https://developer.apple.com/documentation/foundation/nsfileprotectionkeyFAQs
Native filesystem access for React Native
We found that @dr.pogodin/react-native-fs demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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