react-native-image-base64-png v0.2.1

react-native-image-base64-png

This is a fork of this library, modified to support png on android and export typescript types.

That repo in turn is a working rewrite of this abandoned library. It provides a very simple way to convert an image to a base64 string.

If you encounter OOM errors on old android devices, make sure you optimize the image's size before you convert it. Indeed working with big images on Android might cause very high memory usage.

Getting started

npm install react-native-image-base64-png --save or yarn add react-native-image-base64-png

Installation

$ react-native link react-native-image-base64-png

Usage

import ImgToBase64 from 'react-native-image-base64-png';

ImgToBase64.getBase64String('file://youfileurl')
  .then(base64String => doSomethingWith(base64String))
  .catch(err => doSomethingWith(err));

Changes made

This package has been updated based on this thread.

Simply put, android/src/java/RNImgToBase64Module.java has been changed as follows:

bitmap.compress(Bitmap.CompressFormat.JPEG, 80, byteArrayOutputStream);

To:

bitmap.compress(Bitmap.CompressFormat.PNG, 80, byteArrayOutputStream);

I have also added types in index.d.ts:

declare module 'react-native-image-base64' {
  export default class ImgToBase64 {
    static getBase64String(filePath: string): Promise<string>;
  }
}