@Raddi_On:
You can use for example request for json.
For example:
defmodule MyAppWeb.Controllers.ExampleController do
def action_name(conn, %{param_name: param_value}) do
matrix = QRCode.encode(param_value).matrix
data = matrix |> Tuple.to_list() |> Enum.map(&Tuple.to_list/1)
json(conn, data)
end
end