Dynamic json in Go

json_print.go

package main

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

func main() {
	m := deserialize(jsonBlob)
	pprint(m)
}

func pprint(m map[string]interface{}) {
	fmt.Println("Object")
	recurse(m, 1)
}

func recurse(m map[string]interface{}, depth int) {
	hyphens := getHyphens(depth)

	for k, v := range m {
		vType := fmt.Sprintf("%T", v)
		switch v.(type) {
		case []interface{}:
			vType = "Array"
			fmt.Printf("%v %v\n", hyphens, vType)
			handleInterface(v, depth+1, k)
		default:
			fmt.Printf("%v %v %v\n", hyphens, k, vType)
		}
	}
}

func handleInterface(i interface{}, depth int, key string) {
	hyphens := getHyphens(depth)
	vType := fmt.Sprintf("%T", i)
	if rec, ok := i.(map[string]interface{}); ok {
		recurse(rec, depth+1)
	} else {
		switch i.(type) {
		case []interface{}:
			iSlice, _ := i.([]interface{})
			switch iSlice[0].(type) {
			case map[string]interface{}:
				fmt.Printf("%v %v %v\n", hyphens, key, "Object")
				handleInterface(iSlice[0], depth, "")
			default:
				// Don't increment depth, because the next iteration will be handled by base case of map
				handleInterface(iSlice[0], depth, key)
			}

		default:
			fmt.Printf("%v %v %v\n", hyphens, key, vType)
		}
	}
}

func getHyphens(d int) string {
	var sb strings.Builder
	for i := 0; i < d*4; i++ {
		sb.WriteString("-")
	}
	return sb.String()
}

func deserialize(js string) map[string]interface{} {
	m := map[string]interface{}{}
	err := json.Unmarshal([]byte(js), &m)
	if err != nil {
		panic(err)
	}
	return m
}

const (
	jsonBlob = string(`{
		"_id": "61410596ba0c39a1fae2f47f",
		"index": 0,
		"guid": "fe1102ba-b5f9-4783-a62c-13adb3c2c293",
		"isActive": false,
		"balance": "$1,500.31",
		"picture": "http://placehold.it/32x32",
		"age": 33,
		"eyeColor": "blue",
		"name": "Aguirre Aguilar",
		"gender": "male",
		"company": "COMTRAK",
		"email": "aguirreaguilar@comtrak.com",
		"phone": "+1 (828) 595-3377",
		"address": "425 Cheever Place, Norfolk, New York, 6272",
		"about": "Veniam do incididunt dolor commodo  labore ea sint dolore . Nulla amet  non Lorem aliquip proident laboris ut. Minim sint ullamco eu magna voluptate. Ut esse cupidatat minim est qui irure ex ullamco qui aliquip.\r\n",
		"registered": "2019-05-12T10:09:42 +07:00",
		"latitude": 34.248956,
		"longitude": 124.1861,
		"tags": [
			"adipisicing",
			"cillum",
			"mollit",
			"consectetur",
			"adipisicing",
			"duis",
			"adipisicing"
		],
		"friends": [{
				"id": 0,
				"name": "Susanne Anderson"
			},
			{
				"id": 1,
				"name": "Kara Moon"
			},
			{
				"id": 2,
				"name": "Petty Holden"
			}
		],
		"greeting": "Hello, Aguirre Aguilar! You have 4 unread messages.",
		"favoriteFruit": "strawberry"
	}`)
)