MMKV
Store key-value data in React Native apps with MMKV, a storage library for the framework.
About MMKV
MMKV is an open source key-value storage library for React Native that connects JavaScript to the native MMKV C++ library. It supports iOS, Android and Web, stores strings, booleans, numbers and ArrayBuffers, and uses synchronous calls without Promises.
Version 4 is implemented as a Nitro Module and requires the react-native-nitro-modules package. By default values are stored in plain text relying on the OS sandbox, with optional encryption, custom paths, multiple instances and multi-process sharing for app groups.
Key features
- Store and retrieve strings, booleans, numbers and ArrayBuffers
- Synchronous get and set without async/await or Promises
- Encrypt stored values with configurable key and AES type
- Create multiple separate instances with custom IDs and paths
- Share data with app extensions via app groups and multi-process mode
- Use React Hooks API for storage access
Best for: Best for React Native developers who need synchronous on-device key-value storage with separate instances and optional encryption.
Good for
- Synchronous reads and writes without async/await, Promises or Bridge
- Supports iOS, Android and Web from the same library
- Multiple instances with separate IDs, paths and encryption settings
Watch out for
- Stores values in plain text by default unless encryption is configured
- Version 4 requires react-native-nitro-modules and migration from Version 3
MMKV at a glance
- Category
- Development › APIs & Databases
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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MMKV FAQ
How do I create separate storage for different users?
Call createMMKV with a custom id, such as user-specific storage, to separate it from the default mmkv.default instance.
How do I share data with app extensions?
Add an AppGroupIdentifier key to Info.plist for your app group; MMKV then stores data in the group location using multi-process mode.
How do I encrypt stored values?
Set an encryptionKey when creating the instance, with encryptionType AES-128 by default or AES-256.
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