Convert json data to javascript array - in multi-dimensional sense - Stack Overflow

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I have a json array say

{
   "People": {
       "Person": [
          {"FirstName": "John", "LastName": "Smith"}
          {"FirstName": "Joe", "LastName": "Bloggs"}
          {"FirstName": "Wendy", "LastName": "Deng"}
        ]
    }
}

And I want to convert this into a javascript array (something like this)

var persons = [ ["FirstName", "John", "LastName", "Smith"], ["FirstName", "Joe", "LastName", "Bloggs"], ["FirstName", "Wendy", "LastName": "Deng"] ];

How do I acplish this? Hope my question makes sense and I realise the javascript array initialization may not be the correct way to put it.

Thanks.

I have a json array say

{
   "People": {
       "Person": [
          {"FirstName": "John", "LastName": "Smith"}
          {"FirstName": "Joe", "LastName": "Bloggs"}
          {"FirstName": "Wendy", "LastName": "Deng"}
        ]
    }
}

And I want to convert this into a javascript array (something like this)

var persons = [ ["FirstName", "John", "LastName", "Smith"], ["FirstName", "Joe", "LastName", "Bloggs"], ["FirstName", "Wendy", "LastName": "Deng"] ];

How do I acplish this? Hope my question makes sense and I realise the javascript array initialization may not be the correct way to put it.

Thanks.

• javascript
• json
• multidimensional-array

Share Improve this question Follow edited Nov 28, 2012 at 10:56 Usman 3,27833 gold badges3030 silver badges4949 bronze badges asked Nov 28, 2012 at 10:49 awongCMawongCM 92755 gold badges2222 silver badges4747 bronze badges 3

• 1 Why would you want to do this? Why not just use the JSON as a JavaScript object? – Aesthete Commented Nov 28, 2012 at 11:05
• Two reasons: 1. It's out of my curiosity if there's any good array-like data structures that I can use to perform data manipulation inside the json such as binary search, binary sort etc versus javascript object. 2. I'm still a JSON newbie. – awongCM Commented Nov 28, 2012 at 11:18
• First of all, JSON is a data interchange format, represented as a string. JSON format can be mapped directly to JavaScript types, including Object and Array. You question doesn't go into why you want to do this, and maybe that would help you to understand the uses of JSON and JavaScript objects. – Aesthete Commented Nov 28, 2012 at 11:24

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2 Answers 2

Sorted by: Reset to default 1

jsfiddle demo: here

var src={
   "People": {
       "Person": [
          {"FirstName": "John", "LastName": "Smith"},
          {"FirstName": "Joe", "LastName": "Bloggs"},
          {"FirstName": "Wendy", "LastName": "Deng"}
        ]
    }
};

var persons=[];
var obj=src["People"]["Person"];
for(i in obj){
  var temp=[];
  temp.push("FirstName");
  temp.push(obj[i].FirstName);
  temp.push("LastName");
  temp.push(obj[i].LastName);
  persons.push(temp);
  }

// persons contain your requried array

What you're trying to do doesn't make alot of sense. Converting an existing valid JSON Object into the array format you specified is rather pointless, and will make accessing elements difficult.

Sounds like what you really want to do is this:

var data = JSON.parse(jsonString); // Your JSON, parsed into a JS object.
var persons = []
data.people.person.foEach( function(el) {
  person.push(el.FirstName + " " + el.LastName);
}

Now persons look like this:

["John Smith", "Joe Bloggs", "Wendy Deng"]

Are you sure you know how JSON and JavaScript objects work?

var myJSON = '{ "foo": { "bar": { "baz" : [1,2,3] } } }' // JSON, String type.
var myObj = JSON.parse(myJSON); // Now a JS Object type.
var innerArray = myObj.foo.bar.baz;

Now the value of variable innerArray is [1,2,3], an Array type.

console.log(innerArray[0]); // Log the first element.

> 1 // First element is 1

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