AWS Rekognition example

index.js

'use strict';

const request = require('request').defaults({ encoding: null });
const aws = require('aws-sdk');
const rekognition = new aws.Rekognition({region: 'eu-west-1'});

exports.handler = function(event, context, callback) {
  request(event.url, function (error, response, body) {
    if (!error && response.statusCode == 200) {
      var params = {
        Image: {
          Bytes: body
        },
        MaxLabels: 10,
        MinConfidence: 0.5
      };
      rekognition.detectLabels(params, function(err, data) {
        if(err || data.Labels.length < 1)
          callback(err || 'No items here...');
        else {
          // Opcionalmente filtramos un número de resultados
          data = data.slice(0, 5);
          callback(err, data);
        }
      });
    }
  });
}

package.json

{
  "name": "rekognition-lambda",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "aws-sdk": "^2.7.13",
    "request": "^2.79.0",
    "request-buffer": "^1.0.3"
  }
}