package main

import (
    "encoding/json"
    "fmt"    
)

func main() {
    // Creating the maps for JSON
    m := map[string]interface{}{}

    // Parsing/Unmarshalling JSON encoding/json
    err := json.Unmarshal([]byte(input), &m)

    if err != nil {
        panic(err)
    }
    parseMap(m)
}

func parseMap(aMap map[string]interface{}) {
    for key, val := range aMap {
        switch concreteVal := val.(type) {
        case map[string]interface{}:
            fmt.Println(key)
            parseMap(val.(map[string]interface{}))
        case []interface{}:
            fmt.Println(key)
            parseArray(val.([]interface{}))
        default:
            fmt.Println(key, ":", concreteVal)
        }
    }
}

func parseArray(anArray []interface{}) {
    for i, val := range anArray {
        switch concreteVal := val.(type) {
        case map[string]interface{}:
            fmt.Println("Index:", i)
            parseMap(val.(map[string]interface{}))
        case []interface{}:
            fmt.Println("Index:", i)
            parseArray(val.([]interface{}))
        default:
            fmt.Println("Index", i, ":", concreteVal)

        }
    }
}

const input = `
{
    "outterJSON": {
        "innerJSON1": {
            "value1": 10,
            "value2": 22,
            "InnerInnerArray": [ "test1" , "test2"],
            "InnerInnerJSONArray": [{"fld1" : "val1"} , {"fld2" : "val2"}]
        },
        "InnerJSON2":"NoneValue"
    }
}
`