Jackson JSON

Spring offers support for the Jackson JSON library.

JSON Views

See equivalent in the Servlet stack

Spring WebFlux provides built-in support for Jackson’s Serialization Views, which allows rendering only a subset of all fields in an Object. To use it with @ResponseBody or ResponseEntity controller methods, you can use Jackson’s @JsonView annotation to activate a serialization view class, as the following example shows:

  • Java

  • Kotlin

@RestController
public class UserController {

	@GetMapping("/user")
	@JsonView(User.WithoutPasswordView.class)
	public User getUser() {
		return new User("eric", "7!jd#h23");
	}
}

public class User {

	public interface WithoutPasswordView {};
	public interface WithPasswordView extends WithoutPasswordView {};

	private String username;
	private String password;

	public User() {
	}

	public User(String username, String password) {
		this.username = username;
		this.password = password;
	}

	@JsonView(WithoutPasswordView.class)
	public String getUsername() {
		return this.username;
	}

	@JsonView(WithPasswordView.class)
	public String getPassword() {
		return this.password;
	}
}
@RestController
class UserController {

	@GetMapping("/user")
	@JsonView(User.WithoutPasswordView::class)
	fun getUser(): User {
		return User("eric", "7!jd#h23")
	}
}

class User(
		@JsonView(WithoutPasswordView::class) val username: String,
		@JsonView(WithPasswordView::class) val password: String
) {
	interface WithoutPasswordView
	interface WithPasswordView : WithoutPasswordView
}
@JsonView allows an array of view classes but you can specify only one per controller method. Use a composite interface if you need to activate multiple views.