Parsing JSON file using Lambda - json

Question

My main objective is to parse a JSON file and write the content of the JSON file to a scrollable list in the browser. I created a JSON file and stored it in an S3 bucket. I then created the following Lambda function:
// ----receive function----v
function get_json(url, callback) {
http.get(url, function(res) {
var body = '';
res.on('data', function(chunk) {
body += chunk;
});
res.on('end', function() {
var response = JSON.parse(body);
// call function ----v
callback(response);
});
});
}
var mydata = get_json("https://s3.amazonaws.com/scrollablelist/scrollableList.json", function (resp) {
console.log(resp);
});
I get the following error:
{
"errorMessage": "http is not defined",
"errorType": "ReferenceError",
"stackTrace": [
"Object.<anonymous> (/var/task/index.js:20:18)",
"Module._compile (module.js:570:32)",
"Object.Module._extensions..js (module.js:579:10)",
"Module.load (module.js:487:32)",
"tryModuleLoad (module.js:446:12)",
"Function.Module._load (module.js:438:3)",
"Module.require (module.js:497:17)",
"require (internal/module.js:20:19)"
]
}
The Log Output says this:
START RequestId: 516f164b-7ee3-11e7-97a7-0373caaf493b Version: $LATEST
module initialization error: ReferenceError
at get_json (/var/task/index.js:3:9)
at Object.<anonymous> (/var/task/index.js:20:18)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
END RequestId: 516f164b-7ee3-11e7-97a7-0373caaf493b
REPORT RequestId: 516f164b-7ee3-11e7-97a7-0373caaf493b Duration: 80.81 ms Billed Duration: 100 ms Memory Size: 128 MB Max Memory Used: 19 MB
Any help would be greatly appreciated.

Answer 1

You have to install npm package for http in your project folder. Please follow below steps,
a. Open node command prompt
b. Navigate (CD ) to your project folder
c. Type command "npm init" if you don't have a package.json file already
e. Type command "npm install http --save" (Which will add http module to package.json)
f. At the beggining of you js file you using "http" please refer http moduleas below,
var http = require("http");
g. Add package.json file as well in the .zip to upload to Lambda (You don't need to include node modules folder)

Answer 2

You have to install the http module. npm install --save http
https://aws.amazon.com/blogs/compute/nodejs-packages-in-lambda/