After "mix phx.gen.json Accounts User users --no-context --no-schema --no-scope email:string"

lib/beet_round_server_web/controllers/user_json.ex

@@ -0,0 +1,24 @@
+defmodule BeetRoundServerWeb.UserJSON do
+  alias BeetRoundServer.Accounts.User
+
+  @doc """
+  Renders a list of users.
+  """
+  def index(%{users: users}) do
+    %{data: for(user <- users, do: data(user))}
+  end
+
+  @doc """
+  Renders a single user.
+  """
+  def show(%{user: user}) do
+    %{data: data(user)}
+  end
+
+  defp data(%User{} = user) do
+    %{
+      id: user.id,
+      email: user.email
+    }
+  end
+end