Removing escape characters after Marshalling - json

Question

In the above code I am trying to convert my key to byte array via Marshal. Although I am successful doing it, when I see the Marshalled string, I am seeing \ escape character before my json keys.
Can you please help me remove that?
func GetBytes(key interface{}) ([]byte, error) {
b, err := json.Marshal(key)
if err != nil {
return nil, err
}
log.Println("%%%%%%%%%%")
log.Printf("%+v\n", key)
log.Println("##########")
log.Println(string(b));
return b, nil
}
Current Output:
%%%%%%%%%%
{"entityId":5010740929,"eventTime":1542706233458}
##########
"{\"entityId\":5010740929,\"eventTime\":1542706233458}"

Answer 1

I think you sending string as key in func GetBytes(key interface{}) ([]byte, error). That's why you are seeing escape characters.
package main
import (
"encoding/json"
"fmt"
"log"
)
func f(key interface{}) {
json, err := json.Marshal(key)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(json))
}
func main() {
data := map[string]interface{}{
"A": 1,
"B": 2,
}
f(data)
json, err := json.Marshal(data)
if err != nil {
log.Fatal(err)
}
f(string(json))
}
Output:
{"A":1,"B":2}
"{\"A\":1,\"B\":2}"
Go playground link: https://play.golang.org/p/iF1ckvZ9cQC
In that case, You can use Unquote to remove quote and escape character:
package main
import (
"encoding/json"
"fmt"
"log"
"strconv"
)
func f(key interface{}) {
json, err := json.Marshal(key)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(json))
st, err := strconv.Unquote(string(json))
fmt.Println(st)
}
func main() {
data := map[string]interface{}{
"A": 1,
"B": 2,
}
json, err := json.Marshal(data)
if err != nil {
log.Fatal(err)
}
f(string(json))
}
Output:
"{\"A\":1,\"B\":2}"
{"A":1,"B":2}
Go playground link: https://play.golang.org/p/aoTEQtJslTs