Update data from incoming json request with existing json format using golangg - json

Question

I have some json data coming from Postman and I want to update it in existing json file (update only required field not all fields) using Golang.
I created IP and port and open channel between me and postman I need to understand how update required element not all element(update name and phone inside authenticator) using Golang.
type he
type UserType struct {
User []struct {
CdbID string `json:"cdb_id"`
Firstname string `json:"firstname"`
Lastname string `json:"lastname"`
Phone int64 `json:"phone"`
Email string `json:"email"`
Address []struct {
Street string `json:"street"`
City string `json:"city"`
Zip string `json:"zip"`
Country string `json:"country"`
} `json:"address"`
Authenticators []Authenticator `json:"authenticators"`
VoiceSig string `json:"voice_sig"`
VoicesigCreatedTime string `json:"voicesig_created_time"`
Status string `json:"status"`
} `json:"user"`
}
type Authenticator struct {
Name string `json:"name"`
Phone int64 `json:"phone"`
}
var u UserType
func main() {
//Parse the Json-encoded Data and store the results in u
// update the user
r := mux.NewRouter()
r.HandleFunc("/", serverhome).Methods("POST")
log.Fatal(http.ListenAndServe("192.168.101.168:4000", r))
}
func serverhome(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("<h1>welcome to golang</h1>"))
file, err := os.ReadFile("user.json") //Read File
if err != nil {
panic(err)
}
json.Unmarshal(file, &u)
body, err := ioutil.ReadAll(r.Body) //read incoming request
if err != nil {
panic(err)
}
fmt.Println(string(body))
u.User[0].Authenticators = append(u.User[0].Authenticators, Authenticator{
Name: "",
})
result, e := json.Marshal(u) //Returns the Json encoding of u into the variable result
if e != nil {
panic(e)
}
var n = 0
n, err = os.Stdout.Write(result) //The line of code golang.org uses to print the Json encoding
if err != nil {
panic(err)
}
fmt.Println(n)
_ = os.WriteFile("test.json", result, 0644)
}re
type UserType struct {
User []struct {
CdbID string `json:"cdb_id"`
Firstname string `json:"firstname"`
Lastname string `json:"lastname"`
Phone int64 `json:"phone"`
Email string `json:"email"`
Address []struct {
Street string `json:"street"`
City string `json:"city"`
Zip string `json:"zip"`
Country string `json:"country"`
} `json:"address"`
Authenticators []Authenticator `json:"authenticators"`
VoiceSig string `json:"voice_sig"`
VoicesigCreatedTime string `json:"voicesig_created_time"`
Status string `json:"status"`
} `json:"user"`
}
type Authenticator struct {
Name string `json:"name"`
Phone int64 `json:"phone"`
}
var u UserType
func main() {
//Parse the Json-encoded Data and store the results in u
// update the user
r := mux.NewRouter()
r.HandleFunc("/", serverhome).Methods("POST")
log.Fatal(http.ListenAndServe("192.168.101.168:4000", r))
}
func serverhome(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("<h1>welcome to golang</h1>"))
file, err := os.ReadFile("user.json") //Read File
if err != nil {
panic(err)
}
json.Unmarshal(file, &u)
body, err := ioutil.ReadAll(r.Body) //read incoming request
if err != nil {
panic(err)
}
fmt.Println(string(body))
u.User[0].Authenticators = append(u.User[0].Authenticators, Authenticator{
Name: "",
})
result, e := json.Marshal(u) //Returns the Json encoding of u into the variable result
if e != nil {
panic(e)
}
var n = 0
n, err = os.Stdout.Write(result) //The line of code golang.org uses to print the Json encoding
if err != nil {
panic(err)
}
fmt.Println(n)
_ = os.WriteFile("test.json", result, 0644)
}