Create JSON object using Jackson in Java [duplicate]

Solution 1:

Try this:

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

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

rootNode.set("obj1", childNode1);

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

rootNode.set("obj2", childNode2);

ObjectNode childNode3 = mapper.createObjectNode();
childNode3.put("name5", "val5");
childNode3.put("name6", "val6");
    
rootNode.set("obj3", childNode3);


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