In order to wrap your all Java Spring Controllers routes with prefix "api" here is what you have to do. So, for example if you have "/user/add" route which is defined is UserController.java
...
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserRepository userRepository;
@GetMapping("add")
....
and to add prefix "api" you have to modify application.yml file and to set servlet contextPath param:
server:
servlet:
contextPath: /api
or if you do not use application.yml but application.properties, add this to your file:
server.servlet.contextPath = /api
and now all of your routes will be prefixed with /api.