Go api endpoint to handle creating nested structs from json data

family.go

/* `go run family.go` to run this on your localhost at port 3000

  curl -X POST -d '{"family_name": "Smith", \
        "members": [{"role": "parent", "gender": "female" \
        , "age": 33}, {"role": "child", "gender": "male", "age": 5}, \
        {"role": "parent", "gender": "male", "age": 40}]}' \
        http://localhost:3000/family/new

  Will print the following to the console:
 
  The Smith family has 1 female parent aged 33, 1 male child aged 5, and
  1 male parent aged 40. */
package main

import (
	"encoding/json"
	"fmt"
	"net/http"
)

type Family struct {
	FamilyName string         `json:"family_name"`
	Members    []FamilyMember `json:"members"`
}

type FamilyMember struct {
	Role   string `json:"role"`
	Gender string `json:"gender"`
	Age    int    `json:"age"`
}

func main() {
	http.HandleFunc("/family/new", NewFamilyHandler)
	http.ListenAndServe(":3000", nil)
}

func NewFamilyHandler(rw http.ResponseWriter, request *http.Request) {
	decoder := json.NewDecoder(request.Body)
	var family Family
	decoder.Decode(&family)
	fmt.Printf("The %s family has ", family.FamilyName)
	var last = len(family.Members) - 1
	for _, member := range family.Members {
		fmt.Printf("1 %s %s aged %d", member.Gender, member.Role, member.Age)
		if member == family.Members[last-1] {
			fmt.Printf(", and ")
		} else if member != family.Members[last] {
			fmt.Println(",")
		} else {
			fmt.Println(".")
		}
	}
}