diff --git a/lib/microwaveprop_web/live/beacon_live/index.ex b/lib/microwaveprop_web/live/beacon_live/index.ex
index 5639572a..c6a1131c 100644
--- a/lib/microwaveprop_web/live/beacon_live/index.ex
+++ b/lib/microwaveprop_web/live/beacon_live/index.ex
@@ -139,14 +139,16 @@ defmodule MicrowavepropWeb.BeaconLive.Index do
   # Replace or add a beacon in the in-memory JSON list without re-querying the DB.
   defp patch_beacons_json(%{assigns: %{beacons_json: json}} = socket, beacon) do
     entry = encode_single_beacon(beacon)
-    updated = Enum.reject(json, &(Map.get(&1, "id") == Map.get(entry, "id"))) ++ [entry]
-    assign(socket, :beacons_json, updated)
+    list = Jason.decode!(json)
+    updated = Enum.reject(list, &(Map.get(&1, "id") == Map.get(entry, "id"))) ++ [entry]
+    assign(socket, :beacons_json, Jason.encode!(updated))
   end
 
   defp remove_from_beacons_json(%{assigns: %{beacons_json: json}} = socket, beacon) do
     id_str = beacon.id |> Ecto.UUID.cast!() |> to_string()
-    updated = Enum.reject(json, &(Map.get(&1, "id") == id_str))
-    assign(socket, :beacons_json, updated)
+    list = Jason.decode!(json)
+    updated = Enum.reject(list, &(Map.get(&1, "id") == id_str))
+    assign(socket, :beacons_json, Jason.encode!(updated))
   end
 
   defp encode_single_beacon(beacon) do