Short aws lambda sample program that scans a dynamodb table

lambda-dynamodb-scan

// create an IAM Lambda role with access to dynamodb
// Launch Lambda in the same region as your dynamodb region
// (here: us-east-1)
// dynamodb table with hash key = user and range key = datetime

console.log('Loading event');
var AWS = require('aws-sdk');
var dynamodb = new AWS.DynamoDB({apiVersion: '2012-08-10'});

exports.handler = function(event, context) {
    var tableName = "chat";
    dynamodb.scan({
        TableName : tableName,
        Limit : 10
    }, function(err, data) {
        if (err) {
            context.done('error','reading dynamodb failed: '+err);
        }
        for (var i in data.Items) {
            i = data.Items[i];
            console.log(i.user.S + ': '+ i.msg.S);
            context.done(null, "Ciao!");
        }
    });
};