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diff --git a/lib/pleroma/web/mastodon_api/views/custom_emoji_view.ex b/lib/pleroma/web/mastodon_api/views/custom_emoji_view.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MastodonAPI.CustomEmojiView do
+  use Pleroma.Web, :view
+
+  alias Pleroma.Emoji
+  alias Pleroma.Web.Endpoint
+
+  def render("index.json", %{custom_emojis: custom_emojis}) do
+    render_many(custom_emojis, __MODULE__, "show.json")
+  end
+
+  def render("show.json", %{custom_emoji: {shortcode, %Emoji{file: relative_url, tags: tags}}}) do
+    url = Endpoint.url() |> URI.merge(relative_url) |> to_string()
+
+    %{
+      "shortcode" => shortcode,
+      "static_url" => url,
+      "visible_in_picker" => true,
+      "url" => url,
+      "tags" => tags,
+      # Assuming that a comma is authorized in the category name
+      "category" => tags |> List.delete("Custom") |> Enum.join(",")
+    }
+  end
+end