react-native-fs

Native filesystem access for react-native

Breaking change in v2.x

• Removed attributes from writeFile and appendFile for iOS / Android consistency
• downloadFile takes options object rather than parameters
• stopDownload will cause the rejection of promise returned by downloadFile
• uploadFiles promise result response property is now body
• A boolean is no longer returned from any method except exists
• downloadFile and uploadFiles return an object of the form { jobId: number, promise: Promise }
• mkdir takes optional 2nd parameter options for iOS users to set the NSURLIsExcludedFromBackupKey attribute

Usage (iOS)

First you need to install react-native-fs:

npm install react-native-fs --save

Adding with CocoaPods

Add the RNFS pod to your list of application pods in your Podfile, using the path from the Podfile to the installed module:

pod 'RNFS', :path => './node_modules/react-native-fs'

Install pods as usual:

pod install

Adding Manually in XCode

In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name] Go to node_modules ➜ react-native-fs and add the .xcodeproj file

In XCode, in the project navigator, select your project. Add the lib*.a from the RNFS project to your project's Build Phases ➜ Link Binary With Libraries Click .xcodeproj file you added before in the project navigator and go the Build Settings tab. Make sure 'All' is toggled on (instead of 'Basic'). Look for Header Search Paths and make sure it contains both $(SRCROOT)/../react-native/React and $(SRCROOT)/../../React - mark both as recursive.

Run your project (Cmd+R)

Usage (Android)

Android support is currently limited to only the DocumentDirectory. This maps to the app's files directory.

Make alterations to the following files:

• android/settings.gradle

...
include ':react-native-fs'
project(':react-native-fs').projectDir = new File(settingsDir, '../node_modules/react-native-fs/android')

• android/app/build.gradle

...
dependencies {
    ...
    compile project(':react-native-fs')
}

• register module (in MainActivity.java)

  • For react-native below 0.19.0 (use cat ./node_modules/react-native/package.json | grep version)

import com.rnfs.RNFSPackage;  // <--- import

public class MainActivity extends Activity implements DefaultHardwareBackBtnHandler {

  ......

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mReactRootView = new ReactRootView(this);

    mReactInstanceManager = ReactInstanceManager.builder()
      .setApplication(getApplication())
      .setBundleAssetName("index.android.bundle")
      .setJSMainModuleName("index.android")
      .addPackage(new MainReactPackage())
      .addPackage(new RNFSPackage())      // <------- add package
      .setUseDeveloperSupport(BuildConfig.DEBUG)
      .setInitialLifecycleState(LifecycleState.RESUMED)
      .build();

    mReactRootView.startReactApplication(mReactInstanceManager, "ExampleRN", null);

    setContentView(mReactRootView);
  }

  ......

}

• For react-native 0.19.0 and higher

import com.rnfs.RNFSPackage; // <------- add package

public class MainActivity extends ReactActivity {
   // ...
    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
        new MainReactPackage(), // <---- add comma
        new RNFSPackage() // <---------- add package
      );
    }

• For react-native 0.29.0 and higher ( in MainApplication.java )

import com.rnfs.RNFSPackage; // <------- add package

public class MainApplication extends Application implements ReactApplication {
   // ...
    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
        new MainReactPackage(), // <---- add comma
        new RNFSPackage() // <---------- add package
      );
    }

Examples

Basic

// require the module
var RNFS = require('react-native-fs');

// get a list of files and directories in the main bundle
RNFS.readDir(RNFS.MainBundlePath)
  .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);
  });

File creation

// require the module
var RNFS = require('react-native-fs');

// create a path you want to write to
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);
  });

File deletion

// 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);
  });

File upload (iOS only)

// 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 uploadBegin = (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);
  });

API

Constants

The following constants are available on the RNFS export:

• MainBundlePath (String) The absolute path to the main bundle directory
• CachesDirectoryPath (String) The absolute path to the caches directory
• DocumentDirectoryPath (String) The absolute path to the document directory
• TemporaryDirectoryPath (String) The absolute path to the temporary directory (iOS only)
• ExternalDirectoryPath (String) The absolute path to the external files, shared directory (android only)
• ExternalStorageDirectoryPath (String) The absolute path to the external storage, shared directory (android only)

readDir(dirpath: string): Promise<ReadDirItem[]>

Reads the contents of path. This must be an absolute path. Use the above path constants to form a usable file path.

The returned promise resolves with an array of objects with the following properties:

type ReadDirItem = {
  name: string;     // The name of the item
  path: string;     // The absolute path to the item
  size: string;     // Size in bytes
  isFile: () => boolean;        // Is the file just a file?
  isDirectory: () => boolean;   // Is the file a directory?
};

readdir(dirpath: string): Promise<string[]>

Node.js style version of readDir that returns only the names. Note the lowercase d.

stat(filepath: string): Promise<StatResult>

Stats an item at path. The promise resolves with an object with the following properties:

type StatResult = {
  name: string;     // The name of the item
  path: string;     // The absolute path to the item
  size: string;     // Size in bytes
  mode: number;     // UNIX file mode
  isFile: () => boolean;        // Is the file just a file?
  isDirectory: () => boolean;   // Is the file a directory?
};

readFile(filepath: string, encoding?: string): Promise<string>

Reads the file at path and return contents. encoding can be one of utf8 (default), ascii, base64. Use base64 for reading binary files.

Note: you will take quite a performance hit if you are reading big files

writeFile(filepath: string, contents: string, encoding?: string): Promise<void>

Write the contents to filepath. encoding can be one of utf8 (default), ascii, base64. options optionally takes an object specifying the file's properties, like mode etc.

appendFile(filepath: string, contents: string, encoding?: string): Promise<void>

Append the contents to filepath. encoding can be one of utf8 (default), ascii, base64.

moveFile(filepath: string, destPath: string): Promise<void>

Moves the file located at filepath to destPath. 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.

copyFile(filepath: string, destPath: string): Promise<void>

Copies the file located at filepath to destPath.

unlink(filepath: string): Promise<void>

Unlinks the item at filepath. If the item does not exist, an error will be thrown.

Also recursively deletes directories (works like Linux rm -rf).

exists(filepath: string): Promise<boolean>

check if the item exist at filepath. If the item does not exist, return false.

mkdir(filepath: string, options?: MkdirOptions): Promise<void>

type MkdirOptions = {
  NSURLIsExcludedFromBackupKey?: boolean; // iOS only
};

Create a directory at filepath. Automatically creates parents and does not throw if already exists (works like Linux mkdir -p).

(IOS only): The NSURLIsExcludedFromBackupKey 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.

downloadFile(options: DownloadFileOptions): { jobId: number, promise: Promise<DownloadResult> }

type DownloadFileOptions = {
  fromUrl: string;          // URL to download file from
  toFile: string;           // Local filesystem path to save the file to
  headers?: Headers;        // An object of headers to be passed to the server
  background?: boolean;
  progressDivider?: number;
  begin?: (res: DownloadBeginCallbackResult) => void;
  progress?: (res: DownloadProgressCallbackResult) => void;
};

type DownloadResult = {
  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
};

Download file from options.fromUrl to options.toFile. Will overwrite any previously existing file.

If options.begin is provided, it will be invoked once upon download starting when headers have been received and passed a single argument with the following properties:

type DownloadBeginCallbackResult = {
  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: Headers;       // The HTTP response headers from the server
};

If options.progress is provided, it will be invoked continuously and passed a single argument with the following properties:

type DownloadProgressCallbackResult = {
  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
};

If options.progressDivider is provided, it will return progress events that divided by progressDivider.

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.

(IOS only): options.background (Boolean) - Whether to continue downloads when the app is not focused (default: false) This option is currently only available for iOS, and you must enable background fetch for your project in XCode.

stopDownload(jobId: number): Promise<void>

Abort the current download job with this ID. The partial file will remain on the filesystem.

(iOS only) uploadFiles(options: UploadFileOptions): { jobId: number, promise: Promise<UploadResult> }

options (Object) - An object containing named parameters

type UploadFileOptions = {
  toUrl: string;            // URL to upload file to
  files: UploadFileItem[];  // An array of objects with the file information to be uploaded.
  headers?: Headers;        // An object of headers to be passed to the server
  fields?: Fields;          // An object of fields to be passed to the server
  method?: string;          // Default is 'POST', supports 'POST' and 'PUT'
  begin?: (res: UploadBeginCallbackResult) => void;
  progress?: (res: UploadProgressCallbackResult) => void;
};

type UploadResult = {
  jobId: number;        // The upload job ID, required if one wishes to cancel the upload. See `stopUpload`.
  statusCode: number;   // The HTTP status code
  headers: Headers;     // The HTTP response headers from the server
  body: string;         // The HTTP response body
};

Each file should have the following structure:

type UploadFileItem = {
  name: string;       // Name of the file, if not defined then filename is used
  filename: string;   // Name of file
  filepath: string;   // Path to file
  filetype: string;   // The mimetype of the file to be uploaded, if not defined it will get mimetype from `filepath` extension
};

If options.begin is provided, it will be invoked once upon upload has begun:

type UploadBeginCallbackResult = {
  jobId: number;        // The upload job ID, required if one wishes to cancel the upload. See `stopUpload`.
};

If options.progress is provided, it will be invoked continuously and passed a single object with the following properties:

type UploadProgressCallbackResult = {
  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 server
  totalBytesSent: number;             // The number of bytes sent to the server
};

Percentage can be computed easily by dividing totalBytesSent by totalBytesExpectedToSend.

(iOS only) stopUpload(jobId: number): Promise<void>

Abort the current upload job with this ID.

getFSInfo(): Promise<FSInfoResult>

Returns an object with the following properties:

type FSInfoResult = {
  totalSpace: number;   // The total amount of storage space on the device (in bytes).
  freeSpace: number;    // The amount of available storage space on the device (in bytes).
};

Test / Demo app

Test app to demostrate the use of the module. Useful for testing and developing the module:

https://github.com/cjdell/react-native-fs-test