Create JSON object using Jackson in Java

Shashank Shekher :

I need to create a JSON string as below using Jackson. I know similar question has been answered already here: Creating a json object using jackson

But my expected JSON string is a little different from the one in above example.

How can I form the below formatted JSON object in Java using only Jackson? Also, I do not prefer creating a separate POJO to achieve this.

Expected Output:

{
    "obj1": {
        "name1": "val1",
        "name2": "val2"
    },
    "obj2": {
        "name3": "val3",
        "name4": "val4"
    },
    "obj3": {
        "name5": "val5",
        "name6": "val6"
    }
}

Sach141 :

Try this:

ObjectMapper mapper = new ObjectMapper();
JsonNode rootNode = mapper.createObjectNode();

JsonNode childNode1 = mapper.createObjectNode();
((ObjectNode) childNode1).put("name1", "val1");
((ObjectNode) childNode1).put("name2", "val2");

((ObjectNode) rootNode).set("obj1", childNode1);

JsonNode childNode2 = mapper.createObjectNode();
((ObjectNode) childNode2).put("name3", "val3");
((ObjectNode) childNode2).put("name4", "val4");

((ObjectNode) rootNode).set("obj2", childNode2);

JsonNode childNode3 = mapper.createObjectNode();
((ObjectNode) childNode3).put("name5", "val5");
((ObjectNode) childNode3).put("name6", "val6");

((ObjectNode) rootNode).set("obj3", childNode3);


String jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
System.out.println(jsonString);

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