package main

import (
  "encoding/json"
  "fmt"
)

// Attributes, eg. Name, must begin with capital letter/character, otherwise it won't work.
// Also, JSON mapping is shown.
type Message struct {
    Name string `json:"name"`
    Body string `json:"body"`
    Time int64  `json:"unix_time"`
}

func main() {
  m := Message{"Alice", "Hello", 1294706395881547000}
  b, err := json.Marshal(m)
  fmt.Println(err)
  fmt.Println(string(b))
}