Need help traversing and modifying this a JSON file.

[cemerick1]

Greetings everyone!

I am in a bit of a pickle in that I can't figure out how to recursively traverse and preserve "errorMessages" while removing these nested "items" parents. Also "items" is an arraynode for the first instance but an object for the rest which makes it even more confusing. Any help is greatly appreciated! God Bless!!

[JooHyukKim]

Try below?

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class JsonModifier {

    private static void removeItemsParents(JsonNode node, JsonNode parent) {
        if (node.isObject()) {
            ObjectNode objectNode = (ObjectNode) node;
            JsonNode itemsNode = objectNode.get("items");
            if (itemsNode != null) {
                // Check if the current node has "errorMessages" to preserve, then handle "items"
                if (itemsNode.isObject()) {
                    // If "items" is an object with "errorMessage", preserve it
                    JsonNode errorMessage = itemsNode.get("errorMessage");
                    if (errorMessage != null) {
                        objectNode.remove("items");
                        objectNode.set("errorMessage", errorMessage);
                    }
                } else if (itemsNode.isArray()) {
                    // If "items" is an array, remove or transform as needed
                    objectNode.remove("items");
                }
            }
            
            // Recurse for children of this object
            node.fields().forEachRemaining(entry -> removeItemsParents(entry.getValue(), node));
        } else if (node.isArray()) {
            ArrayNode arrayNode = (ArrayNode) node;
            for (JsonNode child : arrayNode) {
                removeItemsParents(child, node);
            }
        }
    }

    public static void main(String[] args) {
        try {
            String jsonString = "{ \"yourJson\": \"goesHere\" }"; // Your JSON string
            ObjectMapper objectMapper = new ObjectMapper();
            JsonNode rootNode = objectMapper.readTree(jsonString);

            removeItemsParents(rootNode, null);

            String modifiedJsonString = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
            System.out.println(modifiedJsonString);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

[cemerick1]

Seems like its removing the first instance of items which in turn is removing the nested error message.

[JooHyukKim]

Right. Maybe you could revise the code a bit and use it?
I am just suggesting one of possible approaches for solving the problem here.