get json from external json file using golang

parse_json_file.go

/* credits: https://coderwall.com/p/8pklhg, by Ceane Lamerez - http://ceanelamerez.com */

/* example.json */

// {
//   "key": "value",
//   "greetings": "Hello World!"
// }

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
)

type JSONData struct {

	//This field will correspond to the specific named key in JSON,
	//as denoted by `json:[key name]`
	Key       string `json:key`
	Greetings string `json:greetings`

	//Make sure your field name is uppercase if you want access to it,
	//Go considers fields that start a lowercase letter private
	//You can access the field however in struct methods however
}

func (q *JSONData) FromJSON(file string) error {

	//Reading JSON file
	J, err := ioutil.ReadFile(file)
	if err != nil {
		panic(err)
	}

	var data = &q
	//Umarshalling JSON into struct
	return json.Unmarshal(J, data)
}

func main() {

	//Setting up a struct where will place our data that we extract
	JSONStruct := &JSONData{}

	//Extracting the JSON data into a golang struct
	err := JSONStruct.FromJSON("example.json")

	//If there was an error extracting the JSON file,
	// (incorrect file type, file not found, etc), go cray!
	if err != nil {
		panic(err)
	}

	//Accsesing that field and printing it.
	fmt.Println(JSONStruct.Key)
	// >> value
	fmt.Println(JSONStruct.Greetings)
	// >> Hello World!
}