How to decode JSON data in Go using the encoding/json package?

To decode JSON data in Go using the encoding/json package, you'll need to follow these steps:

Define a struct that represents the JSON data structure.
Create a variable with the defined struct type to hold the decoded data.
Use the json.Unmarshal() function to decode the JSON data into the struct variable.

Here's an example to illustrate the process:

package main

import (
	"encoding/json"
	"fmt"
)

// Define a struct that represents the JSON data structure
type Person struct {
	Name  string   `json:"name"`
	Age   int      `json:"age"`
	Email []string `json:"email"`
}

func main() {
	// JSON data to decode
	jsonData := `
	{
		"name": "John Doe",
		"age": 30,
		"email": ["[email protected]", "[email protected]"]
	}
	`

	// Create a variable with the defined struct type
	var person Person

	// Use json.Unmarshal() to decode the JSON data into the struct variable
	err := json.Unmarshal([]byte(jsonData), &person)
	if err != nil {
		fmt.Println("Error decoding JSON data:", err)
		return
	}

	// Access the decoded data
	fmt.Println("Name:", person.Name)
	fmt.Println("Age:", person.Age)
	fmt.Println("Emails:")
	for _, email := range person.Email {
		fmt.Println("-", email)
	}
}

In this example, we define a Person struct representing the JSON data structure. Then, we create a variable person of that type to hold the decoded data. We use json.Unmarshal() to decode the jsonData into the person variable. Finally, we can access the decoded data like any other Go struct fields and print them.