If you are using wordpress 2.9+ , It is just so easy. You don’t have to worry about the evil thing called “eval” and you don’t have to worry about including JSON javascript parser with your theme/plugin.
Wordpress 2.9+ contains the json2.js from json.org.
So, just put a line in your plugin
wp_enqueue_script("json2");//must be put inside some function [...]
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