Accessing array elment in JSON object is undefined

Question

I am relatively new to javascript and very new to JSON and got the job of changing an internal website so it meets our new company needs. I am trying to access a JSON object with an array in it. This actually works pretty for most of the objects, except the array. Everytime I try to access the elements in the array I get undefined or NaN.

When I do

alert(JSON.stringify(object.data.average[0]));

I get the following output

[{"test_count2":"360","succeeded":"185"}]

so I know the objects I am trying to access are there, but when I do

alert(JSON.stringify(object.data.average[0].succeeded))

or

alert(JSON.stringify(object.data.average[0]['succeeded']))

I always get just

undefined

Am I doing something entirely wrong here? As I sad, I am a newby, so please be patient with me ;)

thanks in advance!

better to paste your whole (or atleast object.data.average) JSON data , as it seems to me that there is an array inside another array ( object.data.average[0][0] ?) — turtle
– turtle, Commented Oct 30, 2014 at 6:49
"average": { "0": [ { "test_count":"360", "succeeded":"185" } ] , "test_count":"192", "failed":"7", "succeeded":"185", "ratio":"0.5978", "id":"41", "overall_status":"1" }, Still I dont get why there is an array inside the array... — ulchSD5922
– ulchSD5922, Commented Oct 30, 2014 at 6:59

Xlander · Accepted Answer · 2014-10-30 08:08:53Z

1

Try with JSON.stringify(object.data.average[0][0].succeeded). It seems that object.data.average[0] returns an array with a single element in it. Also, you can use console.log(object.data), instead of alert. It's way easier to see a tree representation of an object in the console on a modern web-browser, instead of alerting string values like in the old days.

edited Oct 30, 2014 at 8:08

Xlander

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answered Oct 30, 2014 at 6:50

Delian Mitankin

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Comments

Henrik Andersson · Accepted Answer · 2014-10-30 06:45:42Z

0

Since it's yet another array you would have to do this

object.data.average[0][0]['succeeded'];

answered Oct 30, 2014 at 6:45

Henrik Andersson

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1 Comment

Henrik Andersson Over a year ago

No problems, happy hacking!

Lakmal Caldera · Accepted Answer · 2014-10-30 06:50:50Z

0

You seem to have forgotten that you have another object inside your array. Try,

alert(JSON.stringify(object.data.average[0][0].succeeded))

answered Oct 30, 2014 at 6:50

Lakmal Caldera

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Comments

touchStone · Accepted Answer · 2014-10-30 06:51:05Z

0

Assuming that you want to access the succeeded value from the "stringified json" , you will need to convert the string '[{"test_count2":"360","succeeded":"185"}]' which is now a plain string back to an json object.

Steps are: var str = '[{"test_count2":"360","succeeded":"185"}]'; var obj = JSON.parse(str); //This function reverses what JSON.stringify does to a json alert(obj.succeeded); //Output: 185

Hope i was clear :)

answered Oct 30, 2014 at 6:51

touchStone

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