[Lambda's code] REST API using DynamoDB.

lambda.js

var AWS = require('aws-sdk');
var dynamo = new AWS.DynamoDB({region: 'ap-northeast-1'});
 
exports.handler = function(event, context) {
 
    var id = event.id || "EXCEPT_VALUE";
    delete event.id;
 
    var params = {
        TableName: 'Test',
        "IndexName": "id-index",
        "KeyConditionExpression":  "#id = :id",
        ExpressionAttributeNames : {
            "#id":"id"
        },
        "ExpressionAttributeValues":{
             ":id":{"S":id}
        }
    };
 
    var operation = event.operation;
    delete event.operation;
 
    dynamo.query(params, function(err, data){
        context.succeed(JSON.parse(JSON.stringify(data, function(key, value) {
                if (value.hasOwnProperty('S')) {
                    return value['S'];
                }
                if (value.hasOwnProperty('BOOL')) {
                    return value['BOOL'];
                }
                if (value.hasOwnProperty('N')) {
                    return value['N'];
                }
                return value;
            })
        ));
    });
};