How to create dynamically a simple json array?

Question

I know this questions exists like 100 times, but I just can't transfer the solutions to my code, so I hope you can help me. This should be pretty easy but I just don't get it working.

This is just my code with other variable because of reasons:

My Code:

for (var key in array) {
}

The JSON I want:

[{
    key: "One",
    y: 5
}, {
    key: "Two",
    y: 2
},];

Pseudo JSON:

[{
    key: key,
    y: array[key].data
},{
    key: key,
    y: array[key].data;
},];

[`JSON.stringify()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify) — Teemu, Aug 03 '15 at 07:24
Note that nothing about this is anything to do with JSON - it's just plain old arrays and objects. — Rory McCrossan, Aug 03 '15 at 07:29

score 2 · Answer 1 · edited Aug 03 '15 at 07:45

2

I don't understand what is 'array'. Is it an object or an array?

I think what you want might be this, if 'array' is an array:

var new_arr = [];

your_array.forEach( function(entry) {
  new_arr.push({key: entry, y: entry.data}); // you should change it according to your need. 
})

return JSON.stringify(new_arr);

Or if 'array' is just an object, you may need this:

var new_arr = [];

for (key in array) {
  new_arr.push({key: key, y: array[key].data}); // you should change it according to your need. 
}

return JSON.stringify(new_arr);

edited Aug 03 '15 at 07:45

Yoshi

54,081
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answered Aug 03 '15 at 07:24

iplus26

2,518
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@Yoshi foolish me... don't use 'new', use another word. – iplus26 Aug 03 '15 at 07:34
@Yoshi yea... I've edited it. Thank you for point out my mistake. – iplus26 Aug 03 '15 at 07:37

Norlihazmey Ghazali · Accepted Answer · 2015-08-26T09:34:13.393

2

You can try this solution:

var data = [];
for (var key in array) {
  data.push({
    key :  key,
    y : array[key].data
  });
}

console.log(data);

But, what about Pseudo JSON:?

DEMO - See console (chrome) for output

edited Aug 26 '15 at 09:34

answered Aug 03 '15 at 07:25

Norlihazmey Ghazali

9,000
1
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1

Thanks a lot that is perfectly what I want! – TobiasW Aug 03 '15 at 08:14

score 0 · Answer 3 · edited May 23 '17 at 12:22

JSON is just a syntax for expressing objects and arrays independently of a scripting language's syntax. Apparently you want to convert your array into another structure and have this expressed in JSON. The conversion to JSON is usually performed by the built-in function JSON.stringify.

Assuming your array isn't really an array (which has only numeric indices, usually without gaps), but more an object-like structure, I'd suggest the following code:

var data = []
for (var key in array)
{
    data.push({key: key, y: array[key].data});
}
var json = JSON.stringify(data);
//...

If array really was an array you shouldn't use a for-in-loop. Otherwise you should consider renaming it to avoid confusion.

score 0 · Answer 4 · answered Aug 03 '15 at 07:30

you can use following line to create an array of json

var jsonArr = [];

then you can create json object from following line

var obj = new Object();

put data in json object as following

obj['id'] = 123;
obj['name'] = 'ABC';

then put json object in json array as

jsonArr.push(obj);

you want to add multiple objects in json array then simply create json object and add one by one using push method.

[{"id":"123","name":"ABC"}]

How to create dynamically a simple json array?

4 Answers4