Consider this my json string,
[{ \"Mat_id\": \"2\", \"Mat_Name\": \"Steel\", \"Measurement\": \"mm\", \"Description\": \"Steel\" }]
use Encoder.js from http://code.google.com/p/jsool/source/browse/jsool-site/js/util/Encoder.js?r=176
when getting data use
Encoder.htmlDecode(value);
and when passing data use