Golang : Covert map/slice/array to JSON or XML format
Problem :
You have a data struct in map, slice or array format and you have to convert the data to JSON or XML format. How to do that?
Solution :
Convert the map, slice or array data to JSON with json.Marshal()
function. In the struct, remember to add struct tags for JSON or XML.
NOTE : Set Content-Type to application/json or application/xml when writing out as HTTP response.
For example :
package main
import (
"encoding/json"
"fmt"
"net/http"
)
type KeyPair struct {
Id int `json:"id"` // <--- json struct tags
Name string `json:"name"` // <--- json struct tags
}
func Home(w http.ResponseWriter, r *http.Request) {
KP := KeyPair{Id: 1, Name: "Adam"}
fmt.Println(KP)
byte, err := json.Marshal(KP) // <---- here !
if err != nil {
return
}
w.Header().Set("Content-Type", "application/json") // <---- here !
fmt.Fprint(w, string(byte))
fmt.Println(string(byte))
}
func main() {
http.HandleFunc("/", Home)
http.ListenAndServe(":8080", nil)
}
To convert struct data to XML, just change the encoder and field tags to XML equivalent. See https://www.socketloop.com/tutorials/golang-xml-to-json-example for guide.
Happy coding!
See also : Golang : XML to JSON example
By Adam Ng
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