package main

import (
  "log"
  "github.com/bsm/openrtb/v3"
)

func main() {
  file, err := os.Open("stored.json")
  if err != nil {
    log.Fatal(err)
  }
  defer file.Close()

  var req *openrtb.BidRequest
  if err := json.NewDecoder(file).Decode(&req); err != nil {
    log.Fatal(err)
  }

  log.Printf("%+v\n", req)
}