Golang JSON Encoding Decoding Example
Last updated Apr 02, 2021In this golang tutorial we will cover how to use JSON in golang to encode decode json. in golang JSON support default data types like
- bool for JSON booleans,
- float64 for JSON numbers,
- string for JSON strings, and
- nil for JSON null
JSON Encode Example
// Go offers built-in support for JSON encoding and
// decoding, including to and from built-in and custom
// data types.
package main
import (
"encoding/json"
"fmt"
"log"
)
func main() {
type Student struct {
Name string
Subjects []string
Id int64 `json:"ref"`
Rank string // An unexported field is not encoded.
}
student := Student{
Name: "Johnson",
Subjects: []string{"English", "Mathmatics", "General Science"},
Id: 999,
Rank: "Distinction",
}
var jsonData []byte
jsonData, err := json.Marshal(student )
if err != nil {
log.Println(err)
}
fmt.Println(string(jsonData))
}
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In the above example it will convert student struct data to JSON data
Output:
{"Name":"Johnson","Subjects":["English","Mathmatics","General Science"],"ref":999,"Rank":"Distinction"}
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To make indentation to print json we need to use
It will print JSON data with indentation json.MarshalIndent(student,""," " )
{
"Name": "Johnson",
"Subjects": [
"English",
"Mathmatics",
"General Science"
],
"ref": 999,
"Rank": "Distinction"
}
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Decode JSON to struct Example
package main
import (
"encoding/json"
"fmt"
"log"
)
func main() {
type Student struct {
Name string
Subject []string
Id int64 `json:"ref"`
Rank string // An unexported field is not encoded.
}
jsonData := []byte(`
{
"Name": "Johnson",
"Subject": [
"English",
"Mathmatics",
"Social Science"
],
"Id": 999,
"Rank":"Top Rank"
}`)
var student Student
err := json.Unmarshal(jsonData, &student)
if err != nil {
log.Println(err)
}
fmt.Println(student.Name, student.Subject, student.Id)
}
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Output:
Johnson [English Mathmatics Social Science] 0
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Related
Convert Float to String in Golang example
Tags: Golang tutorial, JSON Enocode, Decode,
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