| 1 | # expo-random
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| 2 |
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| 3 | Provides a native interface for creating strong random bytes. With `Random` you can generate random values to address use cases that other APIs like the web's `crypto.getRandomValues` and Node's `crypto.randomBytes` might address.
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| 5 | # Installation in managed Expo projects
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| 6 |
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| 7 | For managed [managed](https://docs.expo.io/versions/latest/introduction/managed-vs-bare/) Expo projects, please follow the installation instructions in the [API documentation for the latest stable release](https://docs.expo.io/versions/latest/sdk/random/).
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| 9 | You can add a polyfill for the web's `crypto.getRandomValues` by installing [expo-standard-web-crypto](https://github.com/expo/expo/tree/master/packages/expo-standard-web-crypto) and importing it in SDK 39 and higher:
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| 10 |
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| 11 | ```js
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| 12 | import { polyfillWebCrypto } from 'expo-standard-web-crypto';
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| 13 |
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| 14 | polyfillWebCrypto();
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| 15 | // crypto.getRandomValues is now globally defined
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| 16 | ```
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| 17 |
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| 18 | Other libraries like [react-native-get-random-values](https://github.com/LinusU/react-native-get-random-values) may work too.
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| 19 |
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| 20 | # Installation in bare React Native projects
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| 21 |
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| 22 | For bare React Native projects, you must ensure that you have [installed and configured the `react-native-unimodules` package](https://github.com/expo/expo/tree/master/packages/react-native-unimodules) before continuing.
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| 23 |
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| 24 | ### Add the package to your npm dependencies
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| 25 |
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| 26 | ```
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| 27 | expo install expo-random
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| 28 | ```
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| 29 |
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| 30 | ### Configure for iOS
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| 31 |
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| 32 | Run `npx pod-install` after installing the npm package.
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| 33 |
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| 34 | ### Configure for Android
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| 35 |
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| 36 | No additional set up necessary.
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