diff --git a/lib/pleroma/web/common_api/common_api.ex b/lib/pleroma/web/common_api/common_api.ex
index 2b8add2fa..fcb0af4e8 100644
--- a/lib/pleroma/web/common_api/common_api.ex
+++ b/lib/pleroma/web/common_api/common_api.ex
@@ -28,7 +28,10 @@ defmodule Pleroma.Web.CommonAPI do
   def post_chat_message(%User{} = user, %User{} = recipient, content) do
     transaction =
       Repo.transaction(fn ->
-        with {_, {:ok, chat_message_data, _meta}} <-
+        with {_, true} <-
+               {:content_length,
+                String.length(content) <= Pleroma.Config.get([:instance, :chat_limit])},
+             {_, {:ok, chat_message_data, _meta}} <-
                {:build_object,
                 Builder.chat_message(
                   user,
@@ -43,6 +46,9 @@ def post_chat_message(%User{} = user, %User{} = recipient, content) do
              {_, {:ok, %Activity{} = activity, _meta}} <-
                {:common_pipeline, Pipeline.common_pipeline(create_activity_data, local: true)} do
           {:ok, activity}
+        else
+          {:content_length, false} -> {:error, :content_too_long}
+          e -> e
         end
       end)
 
diff --git a/test/web/common_api/common_api_test.exs b/test/web/common_api/common_api_test.exs
index 1984aac8d..c17e30210 100644
--- a/test/web/common_api/common_api_test.exs
+++ b/test/web/common_api/common_api_test.exs
@@ -23,6 +23,8 @@ defmodule Pleroma.Web.CommonAPITest do
   setup do: clear_config([:instance, :max_pinned_statuses])
 
   describe "posting chat messages" do
+    setup do: clear_config([:instance, :chat_limit])
+
     test "it posts a chat message" do
       author = insert(:user)
       recipient = insert(:user)
@@ -47,6 +49,22 @@ test "it posts a chat message" do
       assert Chat.get(author.id, recipient.ap_id)
       assert Chat.get(recipient.id, author.ap_id)
     end
+
+    test "it reject messages over the local limit" do
+      Pleroma.Config.put([:instance, :chat_limit], 2)
+
+      author = insert(:user)
+      recipient = insert(:user)
+
+      {:error, message} =
+        CommonAPI.post_chat_message(
+          author,
+          recipient,
+          "123"
+        )
+
+      assert message == :content_too_long
+    end
   end
 
   test "when replying to a conversation / participation, it will set the correct context id even if no explicit reply_to is given" do
diff --git a/test/web/pleroma_api/views/chat_message_view_test.exs b/test/web/pleroma_api/views/chat_message_view_test.exs
index e690da022..ad8febee6 100644
--- a/test/web/pleroma_api/views/chat_message_view_test.exs
+++ b/test/web/pleroma_api/views/chat_message_view_test.exs
@@ -23,7 +23,7 @@ test "it displays a chat message" do
 
     chat_message = ChatMessageView.render("show.json", object: object, for: user, chat: chat)
 
-    assert chat_message[:id] == object.id
+    assert chat_message[:id] == object.id |> to_string()
     assert chat_message[:content] == "kippis"
     assert chat_message[:actor] == user.ap_id
     assert chat_message[:chat_id]
@@ -34,7 +34,7 @@ test "it displays a chat message" do
 
     chat_message_two = ChatMessageView.render("show.json", object: object, for: user, chat: chat)
 
-    assert chat_message_two[:id] == object.id
+    assert chat_message_two[:id] == object.id |> to_string()
     assert chat_message_two[:content] == "gkgkgk"
     assert chat_message_two[:actor] == recipient.ap_id
     assert chat_message_two[:chat_id] == chat_message[:chat_id]
diff --git a/test/web/pleroma_api/views/chat_view_test.exs b/test/web/pleroma_api/views/chat_view_test.exs
index 1eb0c6241..3dca555e8 100644
--- a/test/web/pleroma_api/views/chat_view_test.exs
+++ b/test/web/pleroma_api/views/chat_view_test.exs
@@ -2,7 +2,7 @@
 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
-defmodule Pleroma.Web.PleromaAPI.ChatMessageViewTest do
+defmodule Pleroma.Web.PleromaAPI.ChatViewTest do
   use Pleroma.DataCase
 
   alias Pleroma.Chat