expo-file-system

What is expo-file-system?

The expo-file-system package provides access to the file system on the device, allowing for reading, writing, deleting, and managing files and directories. It is part of the Expo ecosystem and is designed to work seamlessly with other Expo modules.

What are expo-file-system's main functionalities?

Reading Files

This feature allows you to read the contents of a file from a given URI. The readAsStringAsync method reads the file and returns its content as a string.

import * as FileSystem from 'expo-file-system';

async function readFile(uri) {
  try {
    const content = await FileSystem.readAsStringAsync(uri);
    console.log(content);
  } catch (error) {
    console.error('Error reading file:', error);
  }
}

Writing Files

This feature allows you to write content to a file at a specified URI. The writeAsStringAsync method writes the provided content to the file.

import * as FileSystem from 'expo-file-system';

async function writeFile(uri, content) {
  try {
    await FileSystem.writeAsStringAsync(uri, content);
    console.log('File written successfully');
  } catch (error) {
    console.error('Error writing file:', error);
  }
}

Deleting Files

This feature allows you to delete a file at a specified URI. The deleteAsync method deletes the file.

import * as FileSystem from 'expo-file-system';

async function deleteFile(uri) {
  try {
    await FileSystem.deleteAsync(uri);
    console.log('File deleted successfully');
  } catch (error) {
    console.error('Error deleting file:', error);
  }
}

Creating Directories

This feature allows you to create a directory at a specified URI. The makeDirectoryAsync method creates the directory, and the intermediates option allows for creating intermediate directories if they do not exist.

import * as FileSystem from 'expo-file-system';

async function createDirectory(uri) {
  try {
    await FileSystem.makeDirectoryAsync(uri, { intermediates: true });
    console.log('Directory created successfully');
  } catch (error) {
    console.error('Error creating directory:', error);
  }
}

Downloading Files

This feature allows you to download a file from a remote URI to a local URI. The downloadAsync method handles the download process.

import * as FileSystem from 'expo-file-system';

async function downloadFile(uri, downloadUri) {
  try {
    const { uri: localUri } = await FileSystem.downloadAsync(downloadUri, uri);
    console.log('File downloaded to:', localUri);
  } catch (error) {
    console.error('Error downloading file:', error);
  }
}

Other packages similar to expo-file-system

react-native-fs

react-native-fs is a file system library for React Native that provides similar functionalities to expo-file-system, such as reading, writing, and managing files and directories. It is more flexible in terms of platform support but requires linking and additional setup compared to the seamless integration of expo-file-system within the Expo ecosystem.

rn-fetch-blob

rn-fetch-blob is a library that provides file system access and network capabilities for React Native. It allows for file manipulation, downloading, and uploading, similar to expo-file-system. However, it also includes advanced features like handling large file uploads and downloads, making it a more comprehensive solution for network and file system operations.

README

expo-file-system

Provides access to the local file system on the device.

API documentation

• Documentation for the main branch
• Documentation for the latest stable release

Installation in managed Expo projects

For managed Expo projects, please follow the installation instructions in the API documentation for the latest stable release.

Installation in bare React Native projects

For bare React Native projects, you must ensure that you have installed and configured the expo package before continuing.

Installation in bare iOS React Native project

No additional set up necessary.

Installation in bare Android React Native project

This module requires permissions to interact with the filesystem and create resumable downloads. The READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE and INTERNET permissions are automatically added.

<!-- Added permissions -->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />

Contributing

Contributions are very welcome! Please refer to guidelines described in the contributing guide.