How to parse JSON string to struct
53,843
Two problems, first, your json is invalid, it needs to use "
instead of '
Second, you have to unmarshal into &data
and not to data
https://play.golang.org/p/zdMq5_ex8G
package main
import (
"fmt"
"encoding/json"
)
type Request struct {
Operation string `json:"operation"`
Key string `json:"key"`
Value string `json:"value"`
}
func main() {
s := string(`{"operation": "get", "key": "example"}`)
data := Request{}
json.Unmarshal([]byte(s), &data)
fmt.Printf("Operation: %s", data.Operation)
}
Side note, you would have seen this, if you would have been checking your errors:
s := string("{'operation': 'get', 'key': 'example'}")
err := json.Unmarshal([]byte(s), data)
if err != nil {
fmt.Println(err.Error())
//json: Unmarshal(non-pointer main.Request)
}
err := json.Unmarshal([]byte(s), &data)
if err != nil {
fmt.Println(err.Error())
//invalid character '\'' looking for beginning of object key string
}
Comments
-
Rudziankoŭ over 2 years
I have
struct
of Request, value is optional:type Request struct { Operation string `json:"operation"` Key string `json:"key"` Value string `json:"value"` }
And function that should parse json string to struct^
go func() { s := string("{'operation': 'get', 'key': 'example'}") data := Request{} json.Unmarshal([]byte(s), data) log.Printf("Operation: %s", data.Operation) }
For some reason data.Operation is empty. What is wrong here?