How to Iterate Over Struct Fields with Reflection in Go

Use the reflect package to iterate over a struct's fields by calling reflect.ValueOf on the struct, then looping through the field count with Type.NumField and accessing each field via FieldByIndex or Field.

import "reflect"

type Person struct {
	Name string
	Age  int
}

func main() {
	p := Person{Name: "Alice", Age: 30}
	v := reflect.ValueOf(p)
	t := v.Type()

	for i := 0; i < t.NumField(); i++ {
		field := t.Field(i)
		value := v.Field(i)
		fmt.Printf("%s: %v\n", field.Name, value.Interface())
	}
}

Reflection lets your Go program inspect its own data structures at runtime. You use it to loop through a struct's fields without hardcoding their names, similar to how a spreadsheet app reads every column in a row automatically. This is useful for generic tools like loggers or serializers that need to handle many different data types.