Expo File System

A unified API for managing local files, directories, and background network transfers across iOS, Android, and web.

Expo File System provides direct access to the device's local storage through a consistent interface. It handles essential operations like reading and writing UTF-8 strings, managing nested directories, and executing background network requests via downloadAsync and uploadAsync. Developers can utilize the documentDirectory for persistent user data or the cacheDirectory for temporary assets (files the OS may purge when storage is low). The library supports resumable downloads and integrates with native platforms to handle large binary files or complex folder structures without blocking the main thread.

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