Specify a local URI (usually in FileSystem.documentDirectory or FileSystem.cacheDirectory ) and set the encoding to Base64 . javascript
npx expo install expo-file-system expo-sharing . react native download base64 file
Large base64 strings can cause "Out of Memory" crashes because they are stored as large strings in the JavaScript heap. For files over 5–10MB, consider streaming the data instead. Specify a local URI (usually in FileSystem
Are you building this for a (like PDF or images) or an offline-first application? For files over 5–10MB, consider streaming the data instead
For Android 10+, you may need to use the Storage Access Framework (SAF) via expo-file-system to allow users to pick a specific folder for their downloads.
Ensure your base64 string does not include the data URI prefix (e.g., data:application/pdf;base64, ). You can remove it using .split(',')[1] .
For non-Expo projects, react-native-blob-util (a maintained fork of rn-fetch-blob ) is the industry standard for handling complex file operations.