Example of how to call the AlchemyVision with the watson-developer-cloud npm module

AlchemyVision.js

// face recognition with a URL
var params = {
  knowledgeGraph: 1 // Include knowledge graph information in the the results.
  url: 'https://upload.wikimedia.org/wikipedia/commons/0/00/Scarlett_Johansson_-_Captain_America_2_press_conference_%28retouched%29_2.jpg'
};

// UNCOMMENT THE CODE BELOW TO SEND AN IMAGE INSTEAD OF A URL
// face recognition with an image
// var params = {
//   image: fs.createReadStream('resources/face.jpg')
// };

// UNCOMMENT THE CODE BELOW TO SEND AN IMAGE AS BASE64 ENCODED IMAGE
// face recognition with an image
// var params = {
//   image: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAYQAAAImCAYAAABTgf2rAAA....'
// };
alchemy_vision.recognizeFaces(params, function (err, keywords) {
  if (err)
    console.log('error:', err);
  else
    console.log(JSON.stringify(keywords, null, 2));
});