base64 string to image node code example
Example 1: nodejs read image as base64
const fs = require('fs');
const contents = fs.readFileSync('/path/to/file.jpg', {encoding: 'base64'});
Example 2: node.js - How do I convert an image to a base64-encoded data URL
var fs = require('fs');
var imageAsBase64 = fs.readFileSync('./your-image.png', 'base64');