React Native save base64 image to Album

Question

Third Party API return a \"QR code image\" in base64 encode,
I need save that image to User\'s Album.

• CamerRoll - not support saving base64 image to album <

Answer 1

I solve the problem,
turn out I forgot data:image/png;base64, at beginning of the string.

I remove it with following code

  // json.qr is base64 string
  var image_data = json.qr.split('data:image/png;base64,');
  image_data = image_data[1];

and then save the image file

  import fetch_blob from 'react-native-fetch-blob';
  import RNFS from 'react-native-fs';

  const fs = fetch_blob.fs
  const dirs = fetch_blob.fs.dirs      
  const file_path = dirs.DCIMDir + "/bigjpg.png"

  // json.qr is base64 string "data:image/png;base64,..."

  var image_data = json.qr.split('data:image/png;base64,');
  image_data = image_data[1];

  RNFS.writeFile(file_path, image_data, 'base64')
  .catch((error) => {
    alert(JSON.stringify(error));
  });

I wrote a blog about this

http://1c7.me/react-native-save-base64-image-to-album/