Spring Boot Backend Visualizer

Client (Browser)

Payload Preview (JSON):

{
  "name": "Jeremy",
  "role": "Professor"
}

Server (Spring Boot)

JSON

Entrance

1. Controller Layer (@RestController)

@PostMapping("/users")
public User create(@RequestBody User u) {
    // JSON is converted to 'u' here!
    return service.save(u);
}

Logic

2. Service Layer (@Service)

public User save(User u) {
    u.setCreatedAt(new Date());
    // Business Logic...
    return repo.save(u);
}

Data Access

3. Repository Layer (@Repository)

public interface UserRepo 
       extends JpaRepository {
    // Generates SQL automatically
}