aws lambda return json data with slashes

Question

i need to print a json data using aws lambda. this is my code

'use strict';
console.log('Loading function');

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

  var addon = require('./path/to/addon');
  var sampleData=addon.getSampleData(userId);
  console.log(sampleData); // it will print correct json data
  //var sampleData="{ \"data\":{ \"key1\": \"1472722877992\", \"key2\": [ 814, 809] }}";

   callback(null, sampleData);
};

i got output like this

"{ \"data\":{ \"key1\": \"1472722877992\", \"key2\": [ 814, 809] }}"

Bu i need to get output like this

"{ "data":{ "key1": "1472722877992", "key2": [ 814, 809] }}"

in this code, i created a npm library addon using c++ code. and getSampleData is a method inside c++ code. it will return a json formated string(not a json object) .in my node.js code, console log print correct json string.

But executing this lambda function returnd output with Slashes. How to solve this issue.

Mark B · Accepted Answer · 2016-09-03 17:28:47Z

4

"{ "data":{ "key1": "1472722877992", "key2": [ 814, 809] }}" isn't a valid string. It's a double quoted string with non-escaped double quotes embedded in it. That isn't valid.

Have you tried using single quotes for the string, like this?

var sampleData='{ "data":{ "key1": "1472722877992", "key2": [ 814, 809] }}';

Or have you tried just returning a JSON object like this?

var sampleData={ "data":{ "key1": "1472722877992", "key2": [ 814, 809] }};

Edit based on new info in question:

Try converting the string to a JSON object like this:

callback(null, JSON.parse(sampleData));

edited Sep 3, 2016 at 17:28

answered Sep 3, 2016 at 13:53

Mark B

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3 Comments

Abdul Manaf Over a year ago

thanks mark, but in my case, i got json formated string from a method. console.log print correct data. but result is wrong. Question updated

Akber Iqbal Over a year ago

I was moving from AWS-EC2 to serverless and faced this, JSON.parse(sampleData) did the trick

George Smith Over a year ago

I am facing the backlashes problem on the other end after calling a Lambda function with the AWS CLI. Using JSON.stringify(orders) works - no backslashes in the when testing with console.log(orders). orders is a JS object that looks like this: { "id": "1", "uid": "gsmith", "items": [ { "name": "HFS - Lightweight Road Running", "single_price": "105.20", "currency": "USD", "count": "2" } ], "order_total": "210.40" } , { "id": "2",... } ]

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