JsonNodeHelper.java

public class JsonNodeHelper {
    /**
     * remove recursively all blank nodes (null, missed, array/object with size 0 and blank text)
     *
     * @param node target node where need to remove blank nodes
     */
    public static void removeBlankNodes(JsonNode node) {
        if (node == null) {
            return;
        }
        if (node.isContainerNode()) {
            Iterator<JsonNode> iterator = node.iterator();
            while (iterator.hasNext()) {
                JsonNode next = iterator.next();
                removeBlankNodes(next);
                if (isBlankNode(next)) {
                    iterator.remove();
                }
            }
        }
    }

    public static boolean isBlankNode(JsonNode node) {
        return node == null
                || node.isNull()
                || node.isMissingNode()
                || (node.isContainerNode() && node.size() == 0)
                || (node.isTextual() && StringUtils.isEmpty(node.textValue()));
    }
}