Couple of simple examples on how to convert JSON string to map and slice(array).

Simple and straightforward way of converting one line of JSON string.


 package main

  import (
          "encoding/json"
          "fmt"
  )

  func main() {

          jsonStr := `{"Name":"Adam","Age":36,"Job":"CEO"}`

          personMap := make(map[string]interface{})

          err := json.Unmarshal([]byte(jsonStr), &personMap)

          if err != nil {
                  panic(err)
          }

          for key, value := range personMap {
                  fmt.Println("index : ", key, " value : ", value)
          }

  }

Output:

    index : Name value : Adam

    index : Age value : 36

    index : Job value : CEO



Convert multiple lines of JSON string to map and append each line into a slice(array).


 package main

 import (
         "encoding/json"
         "fmt"
         "strconv"
 )

 func main() {

         jsonStr := `[{
         "Name": "Adam",
         "Age": 36,
         "Job": "CEO"
 }, {
         "Name": "Eve",
         "Age": 34,
         "Job": "CFO"
 }, {
         "Name": "Mike",
         "Age": 38,
         "Job": "COO"
 }]`

         type Person struct {
                 Name string
                 Age  int
                 Job  string
         }
         var people []Person

         var personMap []map[string]interface{}

         err := json.Unmarshal([]byte(jsonStr), &personMap)

         if err != nil {
                 panic(err)
         }

         for _, personData := range personMap {

                 // convert map to array of Person struct
                 var p Person
                 p.Name = fmt.Sprintf("%s", personData["Name"])
                 p.Age, _ = strconv.Atoi(fmt.Sprintf("%v", personData["Age"]))
                 p.Job = fmt.Sprintf("%s", personData["Job"])
                 people = append(people, p)

         }
         fmt.Println(people)

 } 

Output:

    [{Adam 36 CEO} {Eve 34 CFO} {Mike 38 COO}]


출처 : https://www.socketloop.com/tutorials/golang-how-to-convert-json-string-to-map-and-slice