Reading nested json data with golang's encoding/json - json

Question

I can't get the correct definition for my structs to capture the nested json data saved in a variable. My code snippet is as below:
package main
import "fmt"
import "encoding/json"
type Data struct {
P string `json:"ports"`
Ports struct {
Portnums []int
}
Protocols []string `json:"protocols"`
}
func main() {
y := `{
"ports": {
"udp": [
1,
30
],
"tcp": [
100,
1023
]
},
"protocols": [
"tcp",
"udp"
]
}`
var data Data
e := json.Unmarshal([]byte(y), &data)
if e == nil {
fmt.Println(data)
} else {
fmt.Println("Failed:", e)
}
}
$ go run foo.go
Failed: json: cannot unmarshal object into Go value of type string

Answer 1

This works for me (see comment to your question above) GoPlay
type Data struct {
Ports struct {
Tcp []float64 `json:"tcp"`
Udp []float64 `json:"udp"`
} `json:"ports"`
Protocols []string `json:"protocols"`
}
func main() {
y := `{
"ports": {
"udp": [
1,
30
],
"tcp": [
100,
1023
]
},
"protocols": [
"tcp",
"udp"
]
}`
d := Data{}
err := json.Unmarshal([]byte(y), &d)
if err != nil {
fmt.Println("Error:", err.Error())
} else {
fmt.Printf("%#+v", d)
}
}
OUTPUT
main.Data{
Ports:struct {
Tcp []float64 "json:\"tcp\"";
Udp []float64 "json:\"udp\""
}{
Tcp:[]float64{100, 1023},
Udp:[]float64{1, 30}
},
Protocols:[]string{"tcp", "udp"}
}