phoenix_api_template/lib/phoenix_api_template_web/router.ex

defmodule PhoenixApiTemplateWeb.Router do
  use PhoenixApiTemplateWeb, :router
  use Plug.ErrorHandler

  defp handle_errors(conn, %{reason: %Phoenix.Router.NoRouteError{message: message}}) do
    conn
    |> json(%{errors: message})
    |> halt()
  end

  defp handle_errors(conn, %{reason: %{message: message}}) do
    conn
    |> json(%{errors: message})
    |> halt()
  end

  pipeline :api do
    plug(:accepts, ["json"])
  end

  pipeline :auth do
    plug PhoenixApiTemplateWeb.Auth.Pipeline
  end

  scope "/api", PhoenixApiTemplateWeb do
    pipe_through(:api)

    get("/", DefaultController, :index)
    post("/register", UserController, :create)
    post("/login", UserController, :sign_in)
  end

  scope "/api", PhoenixApiTemplateWeb do
    pipe_through([:api, :auth])

    get "/users/by_id/:id", UserController, :show
  end
end