Parsing Json in Golang

Concept:

[]Json array ---->[]Byte array ----> Struct

Syntax: func Unmarshal(data []byte, v interface{}) error

Code:

// Golang program to illustrate the

// concept of parsing JSON to an array

package main

import (

    "encoding/json"

    "fmt"

)

// declaring a struct

type Competitors struct {

    // defining struct variables

    Username string

    School   string

    Online   bool

    Score    int

}

// main function

func main() {

    // defining a struct instance

    var competitors []Competitors

    // JSON array to be decoded

    // to an array in golang

    Data := []byte(`

    [

        {"username": "competitor1", "school": "SMK Swasta 1", "online": true, "score": 987},

        {"username": "competitor2", "school": "SMK Negeri 7", "online": false, "score": 432},

        {"username": "competitor3", "school": "SMK Swasta 2", "online": false, "score": 321},

        {"username": "competitor4", "school": "SMK Negeri 10", "online": true, "score": 654}

    ]`)

    // decoding JSON array to

    // the country array

    err := json.Unmarshal(Data, &competitors)

    if err != nil {

        // if error is not nil

        // print error

        fmt.Println(err)

    }

    // printing decoded array

    // values one by one

    for i := range competitors {

        fmt.Printf("%s - %s - %t - %d \n",

            competitors[i].Username, competitors[i].School, competitors[i].Online, competitors[i].Score)

    }

}

References: How to Parse JSON in Golang? - GeeksforGeeks