Use Field Tags in the Definition of Struct Type
During the definition of a struct type, optional string values may be added to each field declaration.
Example
package main
import (
"fmt"
"encoding/json"
)
type Employee struct {
FirstName string `json:"firstname"`
LastName string `json:"lastname"`
City string `json:"city"`
}
func main() {
json_string := `
{
"firstname": "Rocky",
"lastname": "Sting",
"city": "London"
}`
emp1 := new(Employee)
json.Unmarshal([]byte(json_string), emp1)
fmt.Println(emp1)
emp2 := new(Employee)
emp2.FirstName = "Ramesh"
emp2.LastName = "Soni"
emp2.City = "Mumbai"
jsonStr, _ := json.Marshal(emp2)
fmt.Printf("%s\n", jsonStr)
}