JSON Binder is a jQuery plugin that will convert form input elements into a generic JSON object.
<form>
<input type="text" name="firstName" value="Fred" />
<input type="checkbox" name="isActiveMember" checked />
</form>
<script>
var result = $("form").JSONBind();
// result
{
"firstName": "Fred",
"isActiveMember": true
}
</script>