const fs    = require('fs');
const regex = /(\.|\/)(gif|jpe?g|png|txt)$/i;
const dir   = './';

fs.readdir(dir, function(err, files) {
  files.forEach(function(file) {
    // Skip current file
    if (file === __filename.slice(__dirname.length + 1)) return;

    fs.readFile(`${dir}${file}`, {encoding: 'base64'}, function(err, str) {
      return err if err;

      const ext = regex.exec(file)[2];
      console.log('################################################################################');
      console.log(file);
      console.log(`data:image/${ext};base64,${str}`);
      console.log('################################################################################');
    });
  });
});