Creating a map[string]interface array and adding json files from different sources there?

Question

JSON

The bottom line is that I have a loop that reads all json files from directories (they are all from different files). And I need to add all the read files to different map intefaces in order to compare fields in the future. Can you suggest how to do this? At the moment, I was able to create only 1 map interface, but I cannot compare json file fields inside it.

var master map[string]interface{}

//var result map[string]interface{}

func main() {
  fileIndex := 3 // three json files. All named test1.json, test2.json and test3.json
  for i := 1; i <= fileIndex; i++ {
    fileName := fmt.Sprintf("%s%d%s", "test", i, ".json")
    // Open jsonFile
    jsonFile, err := os.Open(fileName)
    if err != nil {
      log.Println("Error:", err)
    }

    defer jsonFile.Close()

    byteValue, _ := ioutil.ReadAll(jsonFile)

    json.Unmarshal(byteValue, &master)

    fmt.Println(master)
}

json files:

{
  "name":"Kate",
  "date":"2013-04-23T19:24:59.511Z",
  "data":"is nice"
}

{
  "name":"Gleison",
  "date":"2012-04-23T19:25:00.511Z",
  "data":"is a good person"
}

{
  "name":"Rodrigo",
  "date":"2013-04-23T20:24:59.511Z",
  "data":"is kind"
}