Golang & JSON config files

main.go

package main

import (
	"encoding/json"
	"fmt"
	"os"
	"time"

	"github.com/rs/xid"
)

// set global config variable
var conf *Config

// create config struct
type Config struct {
	ID     xid.ID `json:"id"`
	Server struct {
		Port int `json:"port"`
	} `json:"server"`
	Database struct {
		Name string `json:"name"`
		URL  string `json:"url"`
	} `json:"database"`
	CreatedAt int64 `json:"createdat"`
}

func main() {

	file, err := os.Open("config.json")
	if err != nil {
		fmt.Printf("[ERROR] Opening File - : %s", err)
	}

	err = json.NewDecoder(file).Decode(&conf)
	if err != nil {
		fmt.Printf("[ERROR] Decoding File - : %s", err)
	}
	conf.ID = xid.New()
	conf.CreatedAt = time.Now().UnixNano()
	PrettyPrint(conf)
	// fmt.Printf("%+v", conf)
}

// PrettyPrint - displays indented JSON
func PrettyPrint(v interface{}) (err error) {
	b, err := json.MarshalIndent(v, "", "  ")
	if err == nil {
		fmt.Println(string(b))
	}
	return
}