I have an Arabic contact script that uses Ajax to retrieve a response from the server after filling the form.

On some apache servers, jQuery.parseJSON() throws an invalid json excepion for the same json it parses perfectly on other servers. This exception is thrown only on chrome and IE.

The json content gets encoded using php's json_encode() function. I tried sending the correct header with the json data and setting the unicode to utf-8, but that didn't help.

This is one of the json responses I try to parse (removed the second part of if because it's long):

{"pageTitle":"\\u062e\\u0637\\u0623 \\u0639\\u0646\\u062f \\u0627\\u0644\\u0625\\u0631\\u0633\\u0627\\u0644 !"
}

Note: This language of this data is Arabic, that's why it looks like this after being parsed with php's json_encode().

You can try to make a request in the examples given down and look at the full response data using firebug or webkit developer tools. The response passes jsonlint!

Finally, I have two urls using the same version of the script, try to browse them using chrome or IE to see the error in the broken example.

The working example : http://namodg.com/n/

The broken example: http://www.mt-is.co.cc/my/call-me/

I would like to note that I manged to fix this by using the old eval() to parse the content, I released another version with this fix, it was like this:

// Parse the JSON data
try
{
    // Use jquery's default parser
    data = $.parseJSON(data);
}
catch(e)
{
    /*
     * Fix a bug where strange unicode chars in the json data makes the jQuery
     * parseJSON() throw an error (only on some servers), by using the old eval() - slower though!
     */
    data = eval( "(" + data + ")" );
}