parse json string into a javascript objects

Question

I'm using Firefox 19.0.2. I receive a JSON string (into a JavaScript function) with changing sizes,

sometimes it is:

var jsonstring = {"CA":"CA","NY":"NY","TX":"TX"}

sometimes it is:

var jsonstring = {"Hello":"Hello","Goodbye":"Goodbye"}

I want to create a result array like this (in case of the first example):

data[0].value = "CA"
data[0].text = "CA"

data[1].value = "NY"
data[1].text = "NY"

data[2].value = "TX"
data[2].text = "TX"

How do I do that?

I read tens of early posts here and tried a couple of for loops, but nothing works.

Just to be pedantic: those are not "JSON strings", those are JavaScript objects declared with object literal syntax. — Pointy
– Pointy, Commented Mar 26, 2013 at 15:17
@Pointy That's not pedantic, that's a very important distinction. — James M
– James M, Commented Mar 26, 2013 at 15:27
Could this be the reason that when i loop on jsonstring with indexes: jsonstring[0], jsonstring[1]... i get letters instead of strings? jsonstring[0] = "{" ,jsonstring[1] = """,jsonstring[2] = "C"..... ? — Rodniko
– Rodniko, Commented Mar 26, 2013 at 15:42
@Pointy can you please explain? i don't know what you mean... — Rodniko
– Rodniko, Commented Mar 26, 2013 at 16:19
@Rodniko well a JSON string is a string value that contains (unparsed) JSON. What you posted are JavaScript object literal expressions. They look like JSON because JSON is a simplified form of JavaScript object literal syntax, but they don't need parsing because the JavaScript interpreter already parsed them. — Pointy
– Pointy, Commented Mar 26, 2013 at 16:35

Justin Bicknell · Accepted Answer · 2013-03-26 15:24:50Z

1

You can use JSON.parse to convert to an object (In your example you arleady have an object though):

var obj= JSON.parse('{"CA":"CA","NY":"NY","TX":"TX"}')

Keep in mind, you can't depend on the order of the attributes in an object, so you could not accomplish what you are trying to do above in a for loop.

edited Mar 26, 2013 at 15:24

answered Mar 26, 2013 at 15:18

Justin Bicknell

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2 Comments

Rodniko Over a year ago

Thank you Justin, but what do i do afterwards? i tried a loop but there is no obj[0]. i also tried obj[0].key but it doesn't work. how do i read the content of obj in a loop after the parsing?

Justin Bicknell Over a year ago

Try pasting the above code into your browsers console, chrome has a good one. Then play around with the object, example: obj.CA == 'CA'

MildlySerious · Accepted Answer · 2013-03-26 15:28:38Z

0

The transform after using JSON.parse to get an object from the JSON, would look something like that:

obj = {
  CA: 'CA',
  LA: 'LA'
};

arr = [];

for (var key in obj) {
  if(!obj.hasOwnProperty(key))
    continue;
  arr.push({value: key, text: obj[key]});
}
// Output
[{ value: "CA", text: "CA" }, { value: "LA", text: "LA" }]

edited Mar 26, 2013 at 15:28

answered Mar 26, 2013 at 15:23

MildlySerious

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