Parsing nested json payloads wrapped in envelope in golang

envelope_json_parsing.go

package main

import "fmt"
import "encoding/json"

type NestedData struct {
  Nested string `json:"nested"`
}

type Data struct {
  Value int `json:"value"`
  NestedValue *NestedData `json:"nested_value"`
}

type Envelope struct {
  Data interface{} `json:"data"`
}

func main() {
  jsonBlob := []byte(`{"data":{"value":1,"nested_value":{"nested": "test"}}}`)
  env := &Envelope{Data: &Data{}}
  err := json.Unmarshal(jsonBlob, env)
  if err != nil {
    fmt.Println(err)
  }

  fmt.Println(env.Data.(*Data).NestedValue.Nested)
}