protractor-screenshot-and-upload.js

const screenshot = (text = '') => {
  const upload = filename => {
    const util = require('util');
    const exec = require('child_process').exec;

    const command = 'curl -sbv ' +
      '-H \'Content-Type: multipart/form-data\' ' +
      '-H \'Accept: application/json\' ' +
      '-F "file=@./' + filename + '" ' +
      '-F "upload_preset=kzrkwuhx" ' +
      '-F "public_id=' + filename + '" ' +
      'https://api.cloudinary.com/v1_1/organicpanda/image/upload'

    const child = exec(command, function(error, stdout, stderr) {});
  };

  // within a test:
  return browser.takeScreenshot().then(function(png) {
    let datetime = new Date().valueOf()
      , filename = `screenshot${text ? '-' + text + '-' : ''}${datetime}.png`
      , stream = fs.createWriteStream(filename);

    stream.write(new Buffer(png, 'base64'));
    stream.end();

    return filename;
  }).then(upload);
}