Can not save large strings

[scottwio]

What happened?

When using AsyncStorage on iOS, I can not store strings larger than around 1024 characters. Doing so simply stores null. This is easily recreated try to store a large string in your app

AsyncStorage.setItem('MY_STRING', Array(1050).fill('a').join(''));

Doing so will give you a manifest containing

{"MY_STRING":null}

saving just 1000 characters however with

AsyncStorage.setItem('MY_STRING', Array(1000).fill('a').join(''));

Will give you

{"MY_STRING":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"}

Deps

"@react-native-async-storage/async-storage": "1.21.0",
"react": "18.2.0",
"react-native": "0.73.3"

System

System:
OS: macOS 14.1.1
CPU: (10) arm64 Apple M1 Max
Memory: 3.56 GB / 64.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 20.10.0
path: ~/.asdf/installs/nodejs/20.10.0/bin/node
Yarn:
version: 1.22.19
path: /opt/homebrew/bin/yarn
npm:
version: 10.2.3
path: ~/.asdf/plugins/nodejs/shims/npm
Watchman:
version: 2023.11.06.00
path: /opt/homebrew/bin/watchman
Managers:
CocoaPods:
version: 1.14.3
path: /Users/xxxxx/.asdf/shims/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 23.0
- iOS 17.0
- macOS 14.0
- tvOS 17.0
- watchOS 10.0
Android SDK: Not Found
IDEs:
Android Studio: 2022.3 AI-223.8836.35.2231.11005911
Xcode:
version: 15.0/15A240d
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.6
path: /usr/bin/javac
Ruby:
version: 2.7.4
path: /Users/xxxxxx/.asdf/shims/ruby
npmPackages:
"@react-native-community/cli": Not Found
react:
installed: 18.2.0
wanted: 18.2.0
react-native:
installed: 0.73.3
wanted: 0.73.3
react-native-macos: Not Found
npmGlobalPackages:
"react-native": Not Found
Android:
hermesEnabled: true
newArchEnabled: false
iOS:
hermesEnabled: true
newArchEnabled: false

Version

1.21.0

What platforms are you seeing this issue on?

• Android
• iOS
• macOS
• Windows
• web

Steps to Reproduce

Can reproduce by following the steps above

Example repo using expo here, doesn't need to be an expo project though

https://github.com/scottwio/expo-async-storage

[krizzu]

Doing so will give you a manifest containing

Manifest holds values with strings.length < 1024. Bigger values are stored in dedicated files

Moving to discussion, as this is not an issue, but implementation detail