Marshall slice and map members of a struct into JSON in Golang.

marshall_slice_map_in_struct.go

package main

import (
	"fmt"
	"encoding/json"
)

type Data struct {
	IntF	int
	StringF	string
	FloatF	float64
	SliceF	[]string
	MapF	map[string]int
}

func (d Data) print() {
	fmt.Printf("IntF: %d\n", d.IntF)
	fmt.Printf("StringF: %s\n", d.StringF)
	fmt.Printf("FloatF: %f\n", d.FloatF)
	fmt.Printf("SliceF: %s\n", d.SliceF)
	fmt.Printf("MapF: %s\n", d.MapF)
}

func main() {
	//Marshaling example
	fmt.Printf("Before marshaling:\n")
	data := Data{5, "55", 55.5, []string{"5", "55", "555"}, map[string]int{"5":5, "55":55, "555":555}}
	data.print()
	b, _ := json.Marshal(data)
	fmt.Printf("\nMarshalled data: %s\n", b)
	
	//Unmarshaling example
	var jsonStr = `{"IntF":555,"StringF":"5","FloatF":5.555,"SliceF":["555","55","5"],"MapF":{"5.5":5.5,"55.5":55.5,"555.5":555.5}}`
	fmt.Printf("\n\nUnmarshaled data:\n%s\n", jsonStr)
	var jsonByte []byte = []byte(jsonStr)
	var unmarData Data
	json.Unmarshal(jsonByte, &unmarData)
	fmt.Printf("\nAfter unmarshaling\n")
	unmarData.print()
}