Javascript Json Parse

Question

I am using Json in javascript. I'm reading the json from test.js. How can I read for(;;).

 <script type="text/javascript">
    $.getScript('ajax/test.js', function(data, textStatus){
        jQuery.each(data, function(return) {
            alert(return.name);
            alert(return.surname)
        });
    });
    </script>

-

TEST JS

for (;;);
{
 "name"     : "Mustafa Can",
 "surname"  : "Pala"
};

Can you please clear this up? What does How can I read for(;;) mean? — Caffeinated
– Caffeinated, Commented Sep 26, 2011 at 2:33
@Matt: It prevents attackers from including the JSON in a script tag after defining property setters so they can intercept the data. — SLaks
– SLaks, Commented Sep 26, 2011 at 11:26

SLaks · Accepted Answer · 2011-09-26 02:33:05Z

2

You need to call $.get to fetch the content of the script as a string, then remove the for(;;);:

$.get('ajax/test.js', function(data, textStatus){
    var json = data.replace(/^for\(;;\);/, "");
    var obj = $.parseJSON(json);

    alert(obj.name);
    alert(obj.surname)
}, 'text');

answered Sep 26, 2011 at 2:33

SLaks

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1 Comment

SLaks Over a year ago

@Gürkan: To prevent jQuery from parsing it as JSON (which would fail) or executing it as Javsacript (which would freeze)

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