example.go

package main

import (
	"encoding/json"
	"fmt"
)

type APIResponse struct {
	Satus int              `json:"status"`
	Body  *APIResponseBody `json:"body"`
}

type APIResponseBody struct {
	Persons []*Person `json:"persons"`
}

type Person struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
}

func main() {

	sutano := &Person{"Sutano", 21}
	fulano := &Person{"Fulano", 22}

	body := &APIResponseBody{}
	body.Persons = append(body.Persons, sutano, fulano)
	
	response := &APIResponse{200, body}
	
	w, _ := json.Marshal(response)
	fmt.Println(string(w))
}