Struggling to get data from AWS lambda JSON - json

Question

I'm working on a lambda project and getting data from an API inside the function which looks like this
{ "Title": "300", "Year": "2006", "Rated": "R", "Released": "09 Mar 2007", "Runtime": "117 min", "Genre": "Action, Fantasy, War", "Director": "Zack Snyder", "Writer": "Zack Snyder (screenplay), Kurt Johnstad (screenplay), Michael B. Gordon (screenplay), Frank Miller (graphic novel), Lynn Varley (graphic novel)", "Actors": "Gerard Butler, Lena Headey, Dominic West, David Wenham", "Plot": "King Leonidas of Sparta and a force of 300 men fight the Persians at Thermopylae in 480 B.C.", "Language": "English", "Country": "USA, Canada, Bulgaria", "Awards": "17 wins & 45 nominations.", "Poster": "https://m.media-amazon.com/images/M/MV5BMjc4OTc0ODgwNV5BMl5BanBnXkFtZTcwNjM1ODE0MQ##._V1_SX300.jpg", "Ratings": [ { "Source": "Internet Movie Database", "Value": "7.7/10" }, { "Source": "Rotten Tomatoes", "Value": "60%" }, { "Source": "Metacritic", "Value": "52/100" } ], "Metascore": "52", "imdbRating": "7.7", "imdbVotes": "691,774", "imdbID": "tt0416449", "Type": "movie", "DVD": "31 Jul 2007", "BoxOffice": "$210,500,000", "Production": "Warner Bros. Pictures", "Website": "http://300themovie.warnerbros.com/", "Response": "True" }
I've tried dot notation, indexing all sorts but no matter what I try, the console log just comes out with
2019-06-14T18:33:46.394Z ecc5d247-6475-464e-8dd7-bec310d98c4a INFO undefined
Has anyone else had the same issue before with lambda and lex?
Thanks
const https = require('https')
let url = "http://www.omdbapi.com/?t=300&r&apikey=3ecc35a"
let reply;
const http = require('http')
let test;
http.get(url, res => {
res.setEncoding("utf8");
let body = "";
res.on("data", data => {
body += data;
});
res.on("end", () => {
console.log(body);
reply = JSON.parse(body);
});
});
This currently produces a perfectly good JSON in the console but it's impossible to actually extract anything. I've tried reply.Year, reply["Year"], reply.[0].Year almost any combination I can think off.
Full Code
'use strict';
'use fetch';
// Close dialog with the customer, reporting fulfillmentState of Failed or Fulfilled ("Thanks, your pizza will arrive in 20 minutes")
function close(sessionAttributes, fulfillmentState, message) {
return {
sessionAttributes,
dialogAction: {
type: 'Close',
fulfillmentState,
message,
},
};
}
// --------------- Events -----------------------
function dispatch(intentRequest, callback) {
console.log(`request received for userId=${intentRequest.userId}, intentName=${intentRequest.currentIntent.name}`);
const sessionAttributes = intentRequest.sessionAttributes;
//const film = intentRequest.currentIntent.film;
const film = intentRequest.currentIntent.slots.film.toString();
console.log(intentRequest.currentIntent.slots.film.toString());
const https = require('https')
let url = "http://www.omdbapi.com/?t=300&r&apikey=3ecc35a"
let reply;
const http = require('http')
let test;
http.get(url, res => {
res.setEncoding("utf8");
let body = "";
res.on("data", data => {
body += data;
});
res.on("end", () => {
console.log(body);
reply = JSON.parse(body);
});
});
//const rating = reply.imdbRating;
console.log(reply);
callback(close(sessionAttributes, 'Fulfilled',
{'contentType': 'PlainText', 'content': `The film ${film} has a rating of `}));
}
// --------------- Main handler -----------------------
// Route the incoming request based on intent.
// The JSON body of the request is provided in the event slot.
exports.handler = (event, context, callback) => {
try {
dispatch(event,
(response) => {
callback(null, response);
});
} catch (err) {
callback(err);
}
};

Answer 1

I tried to reproduce the issue with that code and got the following error
Response:
{
"errorType": "TypeError",
"errorMessage": "Cannot read property 'name' of undefined",
"trace": [
"TypeError: Cannot read property 'name' of undefined",
" at dispatch (/var/task/index.js:20:112)",
" at Runtime.exports.handler (/var/task/index.js:65:9)",
" at Runtime.handleOnce (/var/runtime/Runtime.js:63:25)",
" at process._tickCallback (internal/process/next_tick.js:68:7)"
]
}
Line 20 of index.js for me is:
console.log(`request received for userId=${intentRequest.userId}, intentName=${intentRequest.currentIntent.name}`);
However when using the test event in the question event.currentIntent doesn't exist and the name property of the event object doesn't exist either.
If I remove part of the console.log statement and change it to reference the Title attribute which exists in the test event I get:
console.log(`request received for Title=${intentRequest.Title}`);
INFO request received for Title=300
Seems like the function's code is referencing attributes fine but the function's just not receiving it's expected event objects.
HTH
-James