JSON for Elixir

Encoding

JSON.encode [ok: true] #=> "{\"ok\":true}"

Decoding

JSON.decode "{\"ok\":true}" #=> [{"ok",true}]

Custom encoder/decoders

defmodule MyJSON do
  use JSON

  def pre_encoder(:undefined), do: :null
  def pre_encoder(value), 	   do: super(value)

  def post_decoder(null),  do: :undefined
  def post_decoder(value), do: super(value)
end