Example of generic Golang json parsing

generic_json_parsing.go

package main

import (
	"encoding/json"
	"reflect"
	"fmt"
)

type GenericObj struct {
	Overwrite interface{} `json:"overwrite"`
}

func main() {
	var jsonBlob = []byte(`{
    "overwrite": [{"value":{"first":true,"second":5}},{"someotherobj":"a string"}]
}`)
	var body GenericObj
	//fmt.Println("%+v", body)
	err := json.Unmarshal(jsonBlob, &body)
	if err != nil {
		fmt.Println("error:", err)
	}
	//fmt.Println("%+v", body)
	
	bodyContents, _ := body.Overwrite.([]interface{})
	//fmt.Println(reflect.ValueOf(bodyContents).Kind())
	//fmt.Println(bodyContents)
	for k, v := range bodyContents {
		fmt.Println("key ", k)
		fmt.Println("value ", v)
		if reflect.ValueOf(v).Kind() == reflect.Map {
			printMap(v)
		}
	}
	
}

func printMap(m interface{}) {
	vm := reflect.ValueOf(m)
	
	if vm.Kind() != reflect.Map {
		fmt.Println("not a map")
		return
	}
	for k, v := range m.(map[string]interface{}) {
		fmt.Println("key ", k)
		fmt.Println("value ", v)
		if reflect.ValueOf(v).Kind() == reflect.Map {
			printMap(v)
		}
	}
}

Created in this Go playground https://play.golang.org/p/vHOLTnZXdI