How to test json structure in spring boot

I finded this code to test is a json is equal to a string

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class MockMvcExampleTests {

    @Autowired
    private MockMvc mvc;

    @Test
    public void exampleTest() throws Exception {
        this.mvc.perform(get("/")).andExpect(status().isOk())
                .andExpect(content().string("Hello World"));
    }

}

Do you know how to test the json structure ? Like check if the object contains id, name, age ... whatever the values are Thanks