hello_struct_to_JSON.go

package main

import (
	"encoding/json"
	"fmt"
)

type greet struct {
	Output string `json:"output"`
}

func main() {
	g := greet{Output: "Hello, 世界"}
	b, err := json.Marshal(g)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(string(b))
}