How Can I Convert Json Number into given user format ?

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Javascript

jQuery

JSON.NET

How can I convert a Json Number string to different format?

I get the Json numebr like that

Amount": 816673.5789

Here Amountis the column name.

I need to write a function using Javascript. This functing has two parameter one is this 'Amount', another is 'NumberFormate'. I need to convert this 'Amount' as given date 'NumberFormate' and function will return this number.

Here 'NumberFormate' indicate how many number we need to count after point.
Example:

If user given format is like that

##.## 

the the function return number as 8,16,673.57

If user given format is like that

##.### 

the the function return number as 8,16,673.578

Please remind that the number wil be comma separated when it return.