Access object inside an array - Javascript

Question

This is how my response body looks like. Its stored in a variable and when i use console.log(body) I get the following.

[
   {
      "key1":"value1",
      "key2":"value2",
      "key3":"value3"
   }
]

Im trying to access "key3" using the following

console.log(body[0].key3)

I get undefined. Im not sure what is wrong here. If i just do

console.log(body[0])

im getting a string [

Thanks for your help here.

the response you are getting is probably a string. you'd have to do something like JSON.parse(body) first — JV Lobo
– JV Lobo, Commented Mar 7, 2019 at 23:45
looks like your body isn't actually that object, but a JSON (string) representation. Try JSON.parse on it first. — Robin Zigmond
– Robin Zigmond, Commented Mar 7, 2019 at 23:45
Thanks guys! Like the everyone mentioned its a string. I was a able to use the solutions given below. — jr0531
– jr0531, Commented Mar 8, 2019 at 0:01

KevBot · Accepted Answer · 2019-03-08 15:26:46Z

3

The Problem Explained

Your JS is looking at the property on a specific character:

Take a look at the following example that will help demonstrate what is going on:

const string = 'Hello';
console.log(string[0] === 'H'); // true
console.log('H'.key3 === undefined); // true

The Solution

You need to JSON.parse the string:

const body = `
[
   {
      "key1":"value1",
      "key2":"value2",
      "key3":"value3"
   }
]
`;

const parsed = JSON.parse(body);
console.log(parsed[0].key3);

edited Mar 8, 2019 at 15:26

answered Mar 7, 2019 at 23:49

KevBot

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1 Comment

Felix Kling Over a year ago

Nitpick: The return value of JSON.parse is not JSON

Jack Bashford · Accepted Answer · 2019-03-07 23:45:27Z

1

body sounds like it's a string - JSON.parse it to an object:

var body = '[{"key1": "value1","key2": "value2","key3": "value3"}]';
console.log(body[0]);
body = JSON.parse(body);
console.log(body[0].key3);

answered Mar 7, 2019 at 23:45

Jack Bashford

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