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up vote 2 down vote favorite

How can i retrieve the values from such JSON response with javascript, I tried normal JSON parsing seem doesn't work

[["102",true,{"username":"someone"}]]

Tried such codes below:

url: "http://somewebsite.com/api.php?v=json&i=[[102]]",
onComplete: function (response) {
var data = response.json[0];
console.log("User: " + data.username); // doesnt work
share|improve this question
    
Can you post what you tried? –  Alexander Puchkov Jul 19 '13 at 3:40
1  
No quotes around someone; That's not JSON response. It's JYON: json-like your own notation. –  Mics Jul 19 '13 at 3:43
    
@AlexPuchkov updated codes that i tried –  Natsume Jul 19 '13 at 3:45
    
Make sure you provided "json" dataType in $.ajax call –  Alexander Puchkov Jul 19 '13 at 3:46
    
@Natsume can you please explain more clearly your problem is, because my answer explains what you had originally, but I'm not sure if it's really what you want –  aaronman Jul 19 '13 at 3:50

3 Answers 3

up vote 3 down vote accepted

So the problem with this is that it looks like an array in an array. So to access an element you would do something like this. 

console.log(obj[0][0]);

should print 102

Lets say you created the object like so: 

var obj = [["102",true,{"username":someone}]];

this is how you would access each element:

obj[0][0] is 102

obj[0][1] is true
and obj[0][2]["username"] is whatever someone is defined as

From other peoples answers it seems like some of the problem you may be having is parsing a JSON string. The standard way to do that is use JSON.parse, keep in mind this is only needed if the data is a string. This is how it should be done. 

var obj = JSON.parse(" [ [ "102", true, { "username" : someone } ] ] ")
share|improve this answer
    
You answer works! But however i can't use JSON.parse since its due to Firefox's SDK, so i done dt = obj.json[0][2], thought when i did dt.username the console will say "undefined", but i'm sure there is an error during response request URL, i'm sure i can manage the URL error part. +1 for you :D –  Natsume Jul 19 '13 at 4:39
    
@Natsume in your original post it looked like someone was a variable, it must be defined for the JSON to work –  aaronman Jul 19 '13 at 4:41
    
oops that was suppose to be string, i forgot to include "" D:. Fixed it :P –  Natsume Jul 19 '13 at 4:42
up vote 4 down vote 
var str = '[["102",true,{"username":"someone"}]]';
var data = JSON.parse(str);
console.log("User: " + data[0][2].username);
  1. Surround someone with double quotes
  2. Traverse the array-of-array before attempting to acces the username property

If you are using AJAX to obtain the data, @Alex Puchkov's answer says it best.

share|improve this answer
    
I edited my answer to include JSON.parse how did you infer that is indeed what the OP wants –  aaronman Jul 19 '13 at 4:31
    
@aaronman well if you're turning a string into an object in JS, that's the only real way to do it. Most other methods (including jQuery's $.ajax) use JSON.parse themselves. In this particular case, the OP had not provided enough information, but an educated guess was that @ @Natsume was indeed using $.ajax, and also that most likely either the parameters for XHR were missing something, or the PHP server was returning the wrong content type, and the returned "object" was actually a string. H/W the question was pointedly about parsing, and not about XHR, hence my answer. –  bguiz Jul 21 '13 at 23:45
    
little late, apparently JSON.parse was not what he wanted, honestly I'm still not sure what he wanted I UV'd u anyway –  aaronman Jul 21 '13 at 23:48
    
@aaronman yep, same here! –  bguiz Jul 21 '13 at 23:57
up vote 3 down vote

It depends on where you are getting JSON from:

If you use jQuery

then jQuery will parse JSON itself and send you a JavaScript variable to callback function. Make sure you provide correct dataType in $.ajax call or use helper method like $.getJSON()

If you getting JSON data via plain AJAX

then you can do:

var jsonVar = JSON.parse(xhReq.responseText);
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