Getting version information at runtime in a React Native app

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react-native-device-info library provides various device and application information, including the app version.
Install

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npm install --save react-native-device-info

Sample usage:

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import React from "react";
import { View, Text } from "react-native";
import DeviceInfo from "react-native-device-info";

const AppInfo = () => (
  <View style={{ padding: 20 }}>
    <Text style={{ fontSize: 8 }}>
      Version: {DeviceInfo.getVersion()} Build Number:{" "}
      {DeviceInfo.getBuildNumber()}
    </Text>
  </View>
);

export default AppInfo;