$.parseJSON("null") Causes Stack Overflow With Internet Explorer 6 - 7

[phistuck]

In all of the (modern) browsers, JSON.parse returns null when called with JSON.parse("null"), so $.parseJSON should do the same for browsers with no native JSON support.

Tested and failed with jQuery 1.7, jQuery 1.6.4, jQuery 1.5.1.

[phistuck]

I neglected to mention that in some configurations, this causes Internet Explorer 6 to simply shut down immediately, without any warning. Other times, it just shows a weird stack overflow alert and the rest of the page keeps loading as usual.

[dmethvin]

This works fine for me in IE7: ​http://jsfiddle.net/dmethvin/eUQVX/

Is it possible you are including some other code that is shimming JSON.parse?

[phistuck]

Oh. Actually, now that you have mentioned it...

I include something like that (after jQuery is loaded, but before I use JSON.parse) -

if (!window.JSON)
{
 window.JSON = {parse: $.parseJSON};
}

Can you maybe add a check for that (JSON.parse !== $.parseJSON) in jQuery?

I prefer to use JSON.parse straight on instead of $.parseJSON every time)...

[dmethvin]

No. Don't replace native methods with semi-functional ones, it will confuse code that expects things to work.