How to Efficiently Parse a JSON Array into a Go Data Structure?

Parsing JSON Array into Data Structure in Go

When dealing with JSON data structured as an array, utilizing a Go map might encounter limitations. A more suitable approach is to define a custom data structure to accommodate the specific format of the data.

An example JSON array:

[
  {"a" : "1"},
  {"b" : "2"},
  {"c" : "3"}
]

To parse this array, a custom type can be defined:

type mytype []map[string]string

This type represents an array of maps, where each map element corresponds to an object in the JSON array.

Here's how to parse the JSON array into the custom type:

package main

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

func main() {
    var data mytype
    file, err := ioutil.ReadFile("test.json")
    if err != nil {
        log.Fatal(err)
    }
    err = json.Unmarshal(file, &data)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(data)
}

By reading the file and unmarshaling its contents into the data variable of type mytype, the JSON array is successfully parsed into a Go structure. The data variable can then be used to access the individual objects in the array.

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