use json helper from common-lib HTTP helper

app/utils.go

@@ -3,7 +3,6 @@ package app
 import (
 	"encoding/json"
 	"log"
-	"net/http"
 	"os"
 	"strings"
 )
@@ -64,16 +63,3 @@ func AnyPrefixes(s string, prefixes []string) string {
 
 	return ""
 }
-
-func WriteJson(w http.ResponseWriter, code int, obj any) {
-	w.Header().Set("Content-Type", "application/json")
-	json, err := json.Marshal(obj)
-	if err != nil {
-		w.WriteHeader(http.StatusInternalServerError)
-		return
-	} else {
-		w.WriteHeader(code)
-		w.Write(json)
-		return
-	}
-}