json to map[string]string

json2map.go

package main

import (
	"encoding/json"
	"fmt"
)

func main() {

	var j = `{
		"metadata1key":"metadata1value",
		"metadata2key":"metadata2value",
		"metadata3key":"metadata3value",
		"metadata4key":"metadata4value",
		"metadata5key":"metadata5value"
	}`

	metadata := make(map[string]string)

	err := json.Unmarshal([]byte(j), &metadata)
	if err != nil {
		fmt.Printf("Error: %s\n", err)
		return
	}

	metadata["metadata6key"] = "metadata6value"
	metadata["metadata7key"] = "metadata7value"
	metadata["metadata8key"] = "metadata8value"
	metadata["metadata9key"] = "metadata9value"
	metadata["metadata10key"] = "metadata10value"

	for key, value := range metadata {
		fmt.Printf("%s -> %s\n", key, value)
	}

}