How to convert structure to JSON?

Question

go

Greetings!
And straight to the point.

package main

import (
  "fmt"
  "encoding/json"
)

type Department struct {
  Id int
  Name string
  Phone string
}

func main() {
  a := Department {1, "test", "12-32"}
  fmt.Println(a)

  b, _ := json.Marshal(a)
  fmt.Println(string(b))
}

{1 test 12-32}
{"Id":1,"Name":"test","Phone":"12-32"}

But if the name of the property in the structure is lowercase:

package main

import (
  "fmt"
  "encoding/json"
)

type Department struct {
  Id int
  name string
  Phone string
}

func main() {
  a := Department {1, "test", "12-32"}
  fmt.Println(a)

  b, _ := json.Marshal(a)
  fmt.Println(string(b))
}

{1 test 12-32}
{"Id":1,"Phone":"12-32"}

Why and most importantly how to win?
Thank you.

Answer 1

I will add. In order for json to display fields with a small letter, you need to register a tag.

type Department struct {
  Id int `json:"id"`
  Name string `json:"name"`
  Phone string `json:"phone"`
}

`json:"name"` - you can write anything instead of name, in json this field will be under that name.
For example:

type Department struct {
  Id int `json:"id"`
  Name string `json:"name"`
  Phone string 
  AnyField string `json:"part"`
}

will bring out

{id: 123, name: "Имя", Phone: "123", part: "AnyField"}