CODEWITHSUNDEEP
javascriptjsonnode.js
John
John

Reputation: 3945

How to extract value from JSON

Using node.js 6.10

console.log("returned data1 " + body);
// returns: returned data1 "{'response' : 'Not latest version of file, update not performed'}"

I want to extract the Not latest version of file, update not performed and place it into the valueReturned var. I have tried

    var jsonBody = JSON.parse(body);
            var valueReturned = jsonBody["response"];
            console.log("logs: " + valueReturned);
// returns: logs: undefined

does anyone know where I am going wrong?

ThankYous

Upvotes: 0

Views: 84

Answers (3)

CertainPerformance
CertainPerformance

Reputation: 370619

A hacky and unreliable method if you have to deal with your body as is would be to manually transform it into JSON format and then parse it:

const body = `"{'response' : 'Not latest version of file, update not performed'}"`;
const formattedBody = body
  .slice(1, body.length - 1)
  .replace(/'/g, '"');
const obj = JSON.parse(formattedBody);
console.log(obj.response);

Upvotes: 0

limbuster
limbuster

Reputation: 81

The problem is body is not a valid JSON format. The key and value should be wrapped in a double quotes("). Otherwise the code should work as shown below:

const body = '{ "response" : "Not latest version of file, update not performed" }';

console.log("returned data1 " + body);
// returns: returned data1 "{'response' : 'Not latest version of file, update not performed'}"

var jsonBody = JSON.parse(body);
var valueReturned = jsonBody["response"];
console.log("logs: " + valueReturned);
// returns: logs: undefined

Upvotes: 0

Sam Ho
Sam Ho

Reputation: 206

You need a valid JSON string to parse JSON. 

let body = "{ \"response\" : \"Not latest version of file, update not performed\"}";
let jsonBody = JSON.parse(body);
let valueReturned = jsonBody.response;
console.log("logs: " + valueReturned);

Upvotes: 2

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