walking_dir.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
)

//File representation
type File struct {
	Name string `json:"Name"`
	Path string `json:"Path"`
}

//Files array
type Files []File

func main() {
	_ = jsonify("data")
}

func jsonify(dir string) error {

	var file Files

	err := filepath.Walk(dir,
		func(path string, info os.FileInfo, err error) error {
			if info.IsDir() {
				return nil
			}
			file = append(file, File{info.Name(), "./" + path})
			return nil
		})

	filesJSON, err := json.Marshal(file)
	if err != nil {
		log.Fatalln("Cannot encode to JSON", err)
	}

	fmt.Println(string(filesJSON))
	toJSON(string(filesJSON))

	return nil
}

func toJSON(str string) {

	var jsonBlob = []byte(str)
	data := Files{}
	err := json.Unmarshal(jsonBlob, &data)
	if err != nil {
		log.Fatalln("Cannot unmarshal json blob", err.Error())
	}
	messageJSON, _ := json.Marshal(data)
	err = ioutil.WriteFile("files.json", messageJSON, 0644)

}