package main

import (
	"encoding/json"
	"fmt"

	"go.mongodb.org/mongo-driver/bson/primitive"
)

func main() {
	td := struct {
		EmptyExample primitive.ObjectID `json:",omitempty"`
	}{}

	out, err := json.Marshal(td)
	if err != nil {
		panic(err)
	}

	fmt.Println(string(out))
}