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Access JSON object to get Resource Bundle key/value pair

I know how to access key value pair from JSON object but in my case, the resource bundle keys are mapped to values.
e.g.
var json = {"label.name.first":"foo","label.name.second":"bar"};
Here json.label.name.first doesn't give me "foo".
Can someone help me with this?

Due to using the period character (.) in the key name, you need to use the [] notation to access its value.
console.log( json['label.name.first'] );
Additionally, you have a JavaScript object, not JSON.
The difference between a JavaScript object or JSON is that JSON is always a string. Secondly, JavaScript objects don't require the same quote standards on the key names.
If you just consider the string below, then yes it can be considred JSON (this is why if you paste it into a JSON parser, it tells you it's valid JSON):
{"label.name.first":"foo","label.name.second":"bar"}
However, if you assign that directly to a JavaScript variable then you have a JavaScript object literal, not JSON. This is because JSON is also a valid JavaScript object/array literal when it is not contained in a string:
var obj = {"label.name.first":"foo","label.name.second":"bar"};
If you were to use it as a string, then it is JSON:
var json = '{"label.name.first":"foo","label.name.second":"bar"}';
// json is a string, so it's JSON
var obj = JSON.parse(json); // parse the JSON into an object
The confusion is quote common because the JSON format is very similar to the format of JavaScript object and array literals.

Do this:
json["label.name.first"]
However, I think you are misunderstanding the . notation.
And BTW your json isn't a JSON, it is a javascript object and not its notation.

It's json["label.name.first"] that would get you "foo". Since your property's name contains characters that cannot be used in variable names.
If you're expecting to access these properties using the syntax json.label.name.first then your JSON needs to be:
var json = {
"label":{
"name":{
"first":"foo",
"second":"bar"
}
}
}

This is not right way to create object, you should create one like this.
var json={"label":{"name":{"first":"foo","second":"bar"}}};
it will also work as json string

How can I convert my Json object to a string?

I have an asynchronous function that returns remote json and stores it in a variable. After that, I try to use JSON.stringify on that variable and display the contents in an alert message to make sure they're a string instead of [object].[object],[object]. Here's the code:
Jsonvar = result.shows;
var jsonstr=JSON.stringify(Jsonvar)
alert(jsonstr + "yay");
It's not displaying anything. If you need even more code let me know.
If you have another method to convert the object to a string, let me know.

JSON.stringify(JSON_OBJECT) will convert a valid JSON object to string.
jsFiddle - check this example
Note : verify if result.shows is a valid JSON object.

Query regarding Difference between JavaScript Object And JSOn Object

Here is my question:
in java script:
we hav an object:
var someObject={"name":"somename"};
Now we want to get the name ,we ll do
alert(someObject.name); //it will print somename Right?
Same object i get from a source which sends a JSON object as
someJSONObject={"name":"someName"};
Now in my javascript code ,without parsing this someJSONObject ,i can get name as
alert(someJSONObject.name);
If it is so ,why we need to convert JSON Object to a javaScript Object by parsing it ,when we can use it as an object without parsing or using eval()?
Thanks !

Because it's not a JSON Object. The syntax {"name":"someName"}, with quoted keys, does not make it JSON, the same syntax is supported by Javascript object literals.
JSON can be embedded in Javascript strings. Like:
var json = '{"key": "value"}';
Then you can parse it into Javascript data types:
var obj = JSON.parse( json );
Note that eval may cause syntax errors because the syntaxes of JSON and Javascript are not ultimately compatible. The above would have caused a syntax error if evaled.

JSON is a string, so it's something like var jsonObject = '{"name":"someName"}'; an object is an object.

How does JSON get converted from a string to an object?

Behind the scenes, is JSON created using eval?
If not, how does the string '{"val1":1,"val2":2}' get turned into an object where .val1 == 1 and .val2 == 2?

JSON is usually converted into a JavaScript object using a JSON parser. Browsers nowadays come with one which can be accessed via the parse method of the JSON object. The traditional pollyfill is json2.js.
That string, however, is not JSON and cannot be parsed with a JSON parser.

try this
var obj = JSON.parse(string);
or this is another way
JSONObject jsonObj = new JSONObject("{\"val1\":\"1\",\"val2\":\"2\"}");

How to parse/use this JSON in Javascript

I have a variable with the following in my code:
{
"Rows":
[
{
"New":1,
"CachedNumberType":0,
"Date":1327479615921,
"Type":2,
"Number":"123456",
"Duration":1
}
]
}
I think it's JSON, how do I parse it? (E.g., with json2.js?) Or how do I use it in my JavaScript?

var jsonObj = JSON.parse(jsonString);

You've said that when you try JSON.parse on the variable containing the "JSON" that it says it can't parse it. Could it be that it's already deserialized? Or maybe it was never JSON at all? For instance, what you quoted, in JavaScript source, is an object literal containing an array literal containing another object literal; no JSON in sight.
If you do console.log(x.Rows[0].Date);, where x is the variable you were trying to pass to JSON.parse, do you see the date value?
A lot of people confuse JSON and JavaScript literal syntax, because JSON is a textual format derived from JavaScript literal syntax. I suspect that's what's happening here.