IE Microsoft JScript runtime error: 'JSON' is undefined

Recently while working with some JavaScript code, I encountered an error in IE7 "IE Microsoft JScript runtime error: 'JSON' is undefined" The error was coming at this line 

var data=JSON.stringify(......) ;

I was getting this error only in IE7 and not in IE8 or IE9. Then I came to know that JSON.stringify was not the part of IE7. It is supported in IE versions greater than 7 i.e IE8, IE9 and other modern browsers support it. So what is the solution? 

Solution:
Use Douglas Crockford's json2.js. According to that file it:

// Create a JSON object only if one does not already exist. We create the
// methods in a closure to avoid creating global variables.

So it will not conflict with modern browsers which support the JSON object. And after using that file I was able to work with JSON object in IE7, IE8, IE9 and other non-ie browsers like FF and Chrome.