try with method

proj/map/asset/js/main.js

@@ -52,20 +52,10 @@ fetch(jsonurl)
 
 let vm = new Vue({
   el: '#root',
-  computed : {
-    db: function () {
-      const jsonurl = "https://ed.brz9.dev/proj/map/asset/json/db.json"
-      let jdb
-
-      fetch(jsonurl)
-        .then(res => res.json())
-        .then(data => jdb = data)
-
-      return jdb
-    },
-  },
   data: {
     currentLang: 'fr',
+    db : {},
+    dburl : "https://ed.brz9.dev/proj/map/asset/json/db.json",
     db2 : {
       restaurants : {
         id : "resto",
@@ -119,6 +109,11 @@ let vm = new Vue({
         langElms[i].style.display = 'revert';
       }
     },
+    async getName(){
+      const res = await fetch(dburl);
+      const data = await res.json();
+      this.db = data;
+    },
     setlang: function (lang) {
       target = document.querySelector("#"+"tab-"+lang);
       marker = document.querySelector("#lang-marker");