Unmarshal the JSON data into a map[string]interface{} in GO (2024)

In GO unmarshaling JSON data into a map[string]interface{} is a common way to dynamically parse JSON without a predefined structure. The encoding/json package in Go is used for this purpose

1. Import the encoding/json Package: This package contains the necessary functions to encode and decode JSON.
2. Define the JSON Data: This can be a string or a byte slice containing your JSON data.
3. Declare a Variable to Hold the Unmarshaled Data: This is typically a variable of type map[string]interface{}, where interface{} can hold any type of value.
4. Unmarshal the JSON Data: Use the json.Unmarshal function to parse the JSON data into your map.

package main
import (
 "encoding/json"
 "fmt"
 "log"
)
func main() {
 // JSON data
 jsonData := `{"name":"John", "age":30, "city":"New York"}`
 // Map to hold the JSON data
 var result map[string]interface{}
 // Unmarshal the JSON into the map
 err := json.Unmarshal([]byte(jsonData), &result)
 if err != nil {
 log.Fatal(err)
 }
 // Print the map
 fmt.Println(result)
 // Accessing data from the map
 // Type assertion is needed as map returns interface{} type
 name, ok := result["name"].(string)
 if ok {
 fmt.Println("Name:", name)
 }
 age, ok := result["age"].(float64) // JSON numbers are floats
 if ok {
 fmt.Println("Age:", age)
 }
}