Load & Parse Json File in Golang

Here is a simple yet practical example of loading and parsing json file in Golang

package main

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

type Page struct {
    ID    int    `json:"id"`
    Title string `json:"title"`
    Url   string `json:"url"`
}

func (p Page) toString() string {
    return toJson(p)
}

func toJson(p interface{}) string {
    bytes, err := json.Marshal(p)
    if err != nil {
        fmt.Println(err.Error())
        os.Exit(1)
    }

    return string(bytes)
}

func main() {

    pages := getPages()
    for _, p := range pages {
        fmt.Println(p.toString())
    }

    fmt.Println(toJson(pages))
}

func getPages() []Page {
    raw, err := ioutil.ReadFile("./pages.json")
    if err != nil {
        fmt.Println(err.Error())
        os.Exit(1)
    }

    var c []Page
    json.Unmarshal(raw, &c)
    return c
}

The json file companion as follow:

[
    {
        "id": 1,
        "title": "About Us",
        "url": "/about-us"
    },
    {
        "id": 2,
        "title": "Team",
        "url": "/team"
    },
    {
        "id": 3,
        "title": "Projects",
        "url": "/projects"
    },
    {
        "id": 4,
        "title": "Hire Us",
        "url": "/hire-us"
    }
]

Thanks to the extensive standard library which make it so easy.