Implement authentication in frontend

front/src/LogIn.vue

@@ -23,20 +23,19 @@
     return extractFromErrorFromField("Password", errors.value);
   })
 
-  function onSubmit(e) {
-    postLogin(user)
-      .then((res) => {
-        if (res.ok) {
-          res.json().then((json) => login(user.value.username, json));
-          router.push('/');
-          return;
-        } else {
-          res.json().then((json) => (errors.value = json));
-        }
-      })
+  async function onSubmit(e) {
+    const res = await postLogin(user)
+    if (res.ok) {
+      let json = await res.json();
+      await login(user.value.username, json);
+      router.push('/');
+      return;
+    } else {
+      res.json().then((json) => (errors.value = json));
+    }
   }
 
-  function login(username, json) {
+  async function login(username, json) {
     useAuthStore().login({username: username, token: json["token"]})
   }
 </script>