What is the best way to fix character encoding issues with native JSON in Internet Explorer 8

When working with JSON containing Unicode text, I encountered an issue with the IE8 native json implementation.

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<script>
    var stringified = JSON.stringify("สวัสดี olé");
    alert(stringified);
</script>

While using json2.js or FireFox's native JSON, the alert() string remains unchanged. However, in IE8, the result is Unicode values instead of the original text: 

\u0e2a\u0e27\u0e31\u0e2a\u0e14\u0e35 ol\u00e9
. Is there a simple way to make IE behave like other browsers, or to convert this string correctly? Do you consider this a bug in IE, given that native JSON implementations are meant to seamlessly replace json2.js?

Edit: A reproducible example on jsfiddle using the provided code - http://jsfiddle.net/vV4uz/

javascriptjsoninternet-explorerunicodeencoding

Answer №1

In response to my previous question - It seems that IE8 does not support this feature natively, but it works properly in the IE9 Beta.

A potential solution is available: 

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<script>
    var stringified = JSON.stringify("สวัสดี olé");
    stringified  = unescape(stringified.replace(/\\u/g, '%u'));
    alert(stringified);
</script>

This code will correctly display the original string using alert() on all versions of IE, Firefox, and Chrome.

Answer №2

Prior to transmitting data to the server, it is advisable to encode it initially using encodeURIComponent(JSON.stringify("Hola olé")) and subsequently apply a utf8 decoder on the server side.

Answer №3

Make sure that your server is set up correctly. I had a similar issue where it was responding to unicode JSON files:

Content-Type: text/html; charset=ISO-8859-1

Answer №4

Personally, I believe the regexp in question may be a bit too aggressive.

Instead of unescape(stringified.replace(/\u/g, '%u')), try using:

unescape(stringified.replace(/([^\\])\\u([0-9][0-9][0-9][0-9])/g,"$1%u$2"));

This modified approach would only modify sequences like \uxxxx if x is a digit and not preceded by a backslash (\).

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