go_jsonにmapをmarshalする

Go

map[string]interface{} をmarshal,unmarshalできる

import (
	"encoding/json"
	"fmt"
)
 
type required struct {
	Name string
	Age  int
}
type param struct {
	required
	Option map[string]interface{}
}
 
func main() {
	js := `{
			"name": "John",
			"age": 25,
			"option": {
				"address": {
					"postal": 1555555,
					"name": "X-X-X"
				},
				"height": 172
			}
		}`
 
	var param param
	err := json.Unmarshal(js, &param)
	if err != nil {
		fmt.Printf("%v", err)
		return
	}
}

必須パラメータを埋め込みにしてみた

オプションのキーをフラットにしたい

上の例では、 optionのキーにオプションのパラメータを詰めたことで option: map[string]interface{} にmarshalできた。 以下のようなJSONはmarshalできるか？

{
  "name": "John",
  "age": 25,
  "address": {
    "postal": 1555555,
    "name": "X-X-X"
  },
  "height": 172
}

dictionary - How to embed a map into a struct so that it has a flat json representation - Stack Overflow

The short answer is no. The language does not allow you to embed either type (slice or map) in a struct.
Just use a map[string]interface{}. Deal with the fact that the values for “key1” and “key2” are strings and everything else is a float somewhere else. That’s really the only way you’re getting that output. You can make the problem as complicated as you’d like beyond this (like transform into a type more like yours or something) but if you’re averse to implementing MarshalJSON the only model which will produce the results you want is map[string]interface{}

その場合は単に map[string]interface{} にするくらい