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String jsonString = "{"id":1,"name":"Joe Smith","data":{"email":"smith@gmail.com","phone":"555-123-4567","title":"CFO","instanceControllerTagLibraryApi":{"developmentMode":false}},"children":[],"instanceControllerTagLibraryApi":{"developmentMode":false}}";

pw.println("<body onload="init('"+jsonString+"');">");

function init(text){
    alert(text);
}

<body onload="init('{"id":1, ... }');">
                     ^--- syntax error after this

(function run(){
    var data = '{"id":1,"name":"Joe Smith","data":{"email":"smith@gmail.com","phone":"555-123-4567","title":"CFO","instanceControllerTagLibraryApi":{"developmentMode":false}},"children":[],"instanceControllerTagLibraryApi":{"developmentMode":false}}';

    function init(){
        console.log(data, JSON.parse(data));
    }

    if (window.addEventListener) {
        window.addEventListener('load', init);
    } else if (window.attachEvent) {
        window.attachEvent('load', init);
    }
})();

<%

String jsonString = "'{"id":1,"name":"Joe Smith","data":{"email":"smith@gmail.com","phone":"555-123-4567","title":"CFO","instanceControllerTagLibraryApi":{"developmentMode":false}},"children":[],"instanceControllerTagLibraryApi":{"developmentMode":false}}'";

%>
<script>
(function run(){
    var data = <%=jsonString%>;

    function init(){
        console.log(data, JSON.parse(data));
    }

    if (window.addEventListener) {
        window.addEventListener('load', init);
    } else if (window.attachEvent) {
        window.attachEvent('load', init);
    }
})();
</script>