fix genkey response

internal/handler/keys.go

@@ -112,7 +112,8 @@ func HandleGenKey(w http.ResponseWriter, r *http.Request) {
 	}
 	key := GenerateKey(name)
 	w.Header().Set("Content-Type", "application/json")
-	fmt.Fprintf(w, "%s", "{"key":""+key+"","name":""+name+""}")
+	resp := map[string]string{"key": key, "name": name}
+	json.NewEncoder(w).Encode(resp)
 }
 
 func HandleStats(w http.ResponseWriter, r *http.Request) {