node.js - AWS Lambda putting item from MQTT request -

i try put mqtt request content dynamodb lambda function script :

 var aws = require("aws-sdk"); var dynamodb = new aws.dynamodb();  exports.handler = function index(e,ctx,callback){  //var msg = json.stringify(ctx); var msg = e.name; var params = {         tablename:"mytable",         item:{             val: {s: msg},             valid: { s:"id"}         }     };       dynamodb.putitem(params,callback);     callback(null,"putting item marcel !!");  } 

i have create/set thing/rule/policy , script work but, have undefined value, try mqtt content store db. test post new topic sns, didn't use correct format have post message (raw):

{"val":"value"} val:"value" "val":value

i find way solve :

var aws = require("aws-sdk"); var dynamodb = new aws.dynamodb();  exports.handler = function index(e,ctx,callback){ // new block const record = e.records[0].sns.message;   var msgjson = json.parse(record);          var msg = msgjson.key1;                    var msg2 = msgjson.key2;                       var string_to_send = json.stringify(msg)+"-"+json.stringify(msg2); // var clean_string = string_to_send.split('"').join('');  var params = {         tablename:"mytable",         item:{             val: {s: clean_string},             valid: {s: "id"}         }     };       dynamodb.putitem(params,callback);     callback(null,"putting item marcel !!");  } 

for test need use sns publish in topic :

{"key1": {"thevalue1"},"key2": {"thevalue2"}}  

or lambda actions -> configure test event -> sns, in message field put :

{\"key1\": \"val\",\"key2\": \"valid\"} 

this work have useless " use split delete it.