文字列のエンコーディングの変換

conv.ex

defmodule Conv do
  def get(url) do
    {:ok, response} = HTTPoison.get(url)
    :iconv.convert("SJIS", "UTF-8", response.body)
  end
end

mix.exs

defmodule Conv.MixProject do
  use Mix.Project

  def project do
    [
      app: :conv,
      version: "0.1.0",
      elixir: "~> 1.8",
      start_permanent: Mix.env() == :prod,
      deps: deps()
    ]
  end

  def application do
    [
      extra_applications: [:logger]
    ]
  end

  defp deps do
    [
      {:iconv, "~> 1.0"}, # https://hex.pm/packages/iconv
      {:httpoison, "~> 1.5"}
    ]
  end
end