How to parse an inner field in a nested JSON object

Question

I have a JSON object similar to this one:

{   "name": "Cain",   "parents": {     "mother" : "Eve",     "father" : "Adam"   } } 

Now I want to parse "name" and "mother" into this struct:

struct {   Name String   Mother String `json:"???"` } 

I want to specify the JSON field name with the json:... struct tag, however I don't know what to use as tag, because it is not the top object I am interested in. I found nothing about this in the encoding/json package docs nor in the popular blog post JSON and Go. I also tested mother, parents/mother and parents.mother.

Answer 1

You could use structs so long as your incoming data isn't too dynamic.

http://play.golang.org/p/bUZ8l6WgvL

package main  import (     "fmt"     "encoding/json"     )  type User struct {     Name string     Parents struct {         Mother string         Father string     } }  func main() {     encoded := `{         "name": "Cain",         "parents": {             "mother": "Eve",             "father": "Adam"         }     }`      // Decode the json object     u := &User{}     err := json.Unmarshal([]byte(encoded), &u)     if err != nil {         panic(err)     }      // Print out mother and father     fmt.Printf("Mother: %s\n", u.Parents.Mother)     fmt.Printf("Father: %s\n", u.Parents.Father) }