A universal library for generating random bytes.
expo-random provides a native interface for creating strong random bytes. With Random you can create values equivalent to Node.js core crypto.randomBytes API. expo-random also works with expo-standard-web-crypto, which implements the W3C Crypto API for generating random bytes.
| Android Device | Android Emulator | iOS Device | iOS Simulator | Web |
|---|---|---|---|---|
- npx expo install expo-randomIf you're installing this in a bare React Native app, you should also follow these additional installation instructions.
import * as Random from 'expo-random';
Random.getRandomBytes(byteCount)| Name | Type | Description |
|---|---|---|
| byteCount | number | A number within the range from |
Generates completely random bytes using native implementations. The byteCount property
is a number indicating the number of bytes to generate in the form of a Uint8Array.
Falls back to Math.random during development to prevent issues with React Native Debugger.
Returns
Uint8ArrayAn array of random bytes with the same length as the byteCount.
Random.getRandomBytesAsync(byteCount)| Name | Type | Description |
|---|---|---|
| byteCount | number | A number within the range from |
Generates completely random bytes using native implementations. The byteCount property
is a number indicating the number of bytes to generate in the form of a Uint8Array.
Returns
Promise<Uint8Array>A promise that fulfills with an array of random bytes with the same length as the byteCount.