var options = {
      uri : 'http://api.pixplorer.co.uk/image?word=' + encodeURIComponent(keyword) + '&size=tb',
      method : 'GET'
};
request(options, function(error, response, body){
      console.log('GET picture callback', error, body);
      if (error){
               callback(null, 'There was an error:');
               callback(error, body);
      }
      else {
              var jsonBody = JSON.parse(body);
              callback(null, jsonBody.images.imageurl);
      }
});