SpringMockEndpoint.java

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.http.MediaType;
import org.springframework.util.ResourceUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.File;
import java.io.IOException;
import java.util.Map;

@RestController
public class MyController {

    // Approach 1 : Drawback - Need to manually convert JSON to String using external website
    // https://tools.knowledgewalls.com/jsontostring
    @GetMapping(value = "/test1", produces = MediaType.APPLICATION_JSON_VALUE)
    String processRequest(){
        return "{\"request\":{\"1\":[{\"apiId\":1,\"newQuota\":12},{\"apiId\":2,\"newQuota\":12}]}}";
    }

    // Approach 2 : Drawback - Needs to create .json file under resources folder for every JSON
    @GetMapping(value = "/test2")
    Map processRequest2() throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        File file = ResourceUtils.getFile("classpath:order.json");
        return objectMapper.readValue(file, Map.class);
    }
}