Converting raw JSON to a JSONObject / JSONValue

The JSONObject takes only JavaScriptObject as its constructor parameter. JavaScriptObject can be returned only by a JSNI function which I wrote:

    public static native JavaScriptObject parseJson(String jsonStr) /*-{

        return eval(jsonStr);

    }-*/;

but when I do 

String json = "{\"userId\" : \"123\", \"sessionId\" : \"456\"}";

JavaScriptObject javaScriptObject = parseJson(json);

I get

ERROR: Uncaught exception escaped. com.google.gwt.core.client.JavaScriptException: (SyntaxError): Unexpected token : 

-Alex

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