public static JsonNode get(final JsonNode node, final String fieldName) {
        if (node == null || !node.has(fieldName)) {
            return null;
        }
        final JsonNode result = node.get(fieldName);
        return result instanceof NullNode ? null : result;
    }
Returns a fields value. If field does not exist or is NullNode then null is returned
main/src/main/java/cgeo/geocaching/utils/JsonUtils.java