React-Native: Convert image url to base64 string

Question

I\'m building a react native app that needs to store images at base64 string format for offline viewing capabilities.

What library / function would give me the best

Answer 1

The standalone expo FileSystem package makes this simple:

const base64 = await FileSystem.readAsStringAsync(photo.uri, { encoding: 'base64' });

• https://docs.expo.io/versions/latest/sdk/filesystem/
• https://github.com/expo/expo/tree/master/packages/expo-file-system

As 2019-09-27 this package handles both file:// and content:// uri's