read dynamo AWS lambda

//https://www.youtube.com/watch?v=G_-aEXmluq8

console.log('emezao');

const AWS = require('aws-sdk');
const docClient = new AWS.DynamoDB.DocumentClient({region:'us-east-1'});

exports.handler = function (e, ctx, callback){

	console.log('handler empezo');

//SCAN ALL
	// var scanningParameters = {
	// 	TableName : "guestbook",
	// 	Limit : 100
	// };


	// docClient.scan(scanningParameters, function(err, data){
	// 		if (err) {
	// 			callback(err, null);
	// 		}else{
	// 			callback(null, data);
	// 		}

	// 	});


//QUERY
	var params = {
		TableName : "guestbook",
		Key:{
			"date":1486535184805
		}
	}
 
 	docClient.get(params, function(err, data){
 		if (err) {
 			callback(err, null);
 		}else{
 			callback(null, data)
 		}
 	})

}