Struct Tags

Struct tags attach metadata that libraries can read through reflection.

struct_tags_reflect.go

package main

import (
	"fmt"
	"reflect"
)

type Item struct {
	SKU   string `json:"sku"`
	Count int    `json:"count"`
}

func main() {
	var fieldIndex = 
	itemType := reflect.TypeOf(Item{})
	field := itemType.Field(fieldIndex)
	jsonName := field.Tag.Get("json")

	fmt.Println("field_index=", fieldIndex)
	fmt.Println("field_name=", field.Name)
	fmt.Println("field_type=", field.Type.String())
	fmt.Println("json_name=", jsonName)
}

package main

import (
	"fmt"
	"reflect"
)

type Item struct {
	SKU   string `json:"sku"`
	Count int    `json:"count"`
}

func main() {
	var fieldIndex = 
	itemType := reflect.TypeOf(Item{})
	field := itemType.Field(fieldIndex)
	jsonName := field.Tag.Get("json")

	fmt.Println("field_index=", fieldIndex)
	fmt.Println("field_name=", field.Name)
	fmt.Println("field_type=", field.Type.String())
	fmt.Println("json_name=", jsonName)
}

struct tags Tags are strings attached to fields. Reflection can read them so encoders and validators can follow naming rules.