Go merge json

merge_json.go

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	inputJSON := `{"environment": "production", "runbook":"http://url","message":"there is a problem"}`
	out := map[string]interface{}{}
	json.Unmarshal([]byte(inputJSON), &out)

	newJSON := `{"environment": "prod", "item":"hello"}`
	new := map[string]interface{}{}
	json.Unmarshal([]byte(newJSON), &new)
	
	for item := range new {
		out[item] = new[item]
	}

	outputJSON, _ := json.Marshal(out)

	fmt.Printf("%s", outputJSON)
}