Playing around with AJAX and returning data via JSON, I was always getting the error handler called in my AJAX call, despite getting data back from the server.

I noticed that my server code, which I'd quickly stolen from another blog, returned the JSON like this:

            oBuilder.Append("{");
            oBuilder.AppendFormat("'{0}' : {1}", "Minute", "500");
            oBuilder.Append("}");

so this would return
 { 'minute' : 500 }

All good right?

Wrong.  Jquery 1.4 now will parse valid JSON only, and that means the single quotes inside that JSON packet HAVE to be double quotes.