Testing Lambda Function to fullfill Chatbot request

Question

I am new to AWS LAmbda, Chatbots, and Javascript.: Ultimately, I am trying to create a chatbot that will make a rest API call (POST) using the value in the slot when the lambda function fulfills the request from the chatbot. I have the lambda code that makes the rest API call working fine in a separate function currently.

I learning and am trying to get the lambda function to fullfill the chatbot request with my below test function:

When I do a test in the chatbot to the test lambda function, I am getting the following error: An error has occurred: The server encountered an error processing the Lambda response

when I tested the payload inside lambda it worked. however, it is not working when I test the chatbot with the same lambda function. I created the lambda function based on the info on this response format page, but I cannot figure out what I am missing in the code. https://docs.aws.amazon.com/lex/latest/dg/lambda-input-response-format.html

Here is the request:

{
  "alternativeIntents": [],
  "botVersion": "$LATEST",
  "dialogState": "ConfirmIntent",
  "intentName": "Hello",
  "message": "are you sure your name is al?",
  "messageFormat": "PlainText",
  "responseCard": null,
  "sentimentResponse": {
    "sentimentLabel": "NEUTRAL",
    "sentimentScore": "{Positive: 0.031974494,Negative: 0.023143388,Neutral: 0.8841075,Mixed: 0.06077461}"
  },
  "sessionAttributes": {},
  "sessionId": "2021-07-25T14:18:31.085Z-OxCrkGGA",
  "slotToElicit": null,
  "slots": {
    "name": "al"
  }
}

Here is my lambda code for the test(Node JS):

exports.handler = function(event, context, callback) {  

   callback(null, {
       "dialogAction":{
           "type":"Close",
           "fullfillmentState":"Fulfilled",
           "message": {
               "contentType":"PlainText",
               "content":"Your request  has been fulfilled"
            }
       }
   });
};

user_1435543 · Answer

If you are using JavaScript, then consider using the AWS SDK for JavaScript to invoke Amazon LEX. There is an end to end tutorial that will step you through this use case.

Building an Amazon Lex chatbot

user_8880593 · Answer

The problem lies with the spelling of one of the properties.

fullfillmentState should be written as fulfillmentState.

exports.handler = function(event, context, callback) {  
   callback(null, {
       "dialogAction":{
           "type":"Close",
           "fulfillmentState":"Fulfilled",
           "message": {
               "contentType":"PlainText",
               "content":"Your request  has been fulfilled"
            }
       }
   });
};

I've made the change to your original function and tested it; above is the working sample.

Testing Lambda Function to fullfill Chatbot request

2 Answers