I have a json that I receive by post
{"endpoint": "assistance"}
I receive this like this
json_map: = make (map[string]interface{})
Now I need to assign it to a variable as a string but I don't know how to do it.
endpoint: = c.String (json_map ["endpoint"])
A type safe way to do this would be creating a struct that represents your request object and unmarshalling it.
This gives you a panic on unexpected requests.
package main
import (
"encoding/json"
"fmt"
)
type response struct {
Endpoint string
}
func main() {
jsonBody := []byte(`{"endpoint": "assistance"}`)
data := response{}
if err := json.Unmarshal(jsonBody, &data); err != nil {
panic(err)
}
fmt.Println(data.Endpoint)
}
// assistance
This program as an example safely decodes the JSON into a struct and prints the value.
What you are trying to achieve is not to convert a JSON to a string but an empty interface interface{} to a string You can achieve this by doing a type assertion:
endpoint, ok := json_map["endpoint"].(string)
if !ok {
// handle the error if the underlying type was not a string
}
Also as @Lex mentionned, it would probably be much safer to have a Go struct defining your JSON data. This way all your fields will be typed and you will no longer need this kind of type assertion.
