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Claude Agent SDK for Elixir – Build AI agents with Claude Code
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lib/claude_code/json_encoder.ex
defmodule ClaudeCode.JSONEncoder do
@moduledoc """
Shared JSON encoding logic for ClaudeCode structs.
Converts structs to maps with nil values removed for clean JSON output.
Used by both Jason.Encoder and JSON.Encoder protocol implementations.
"""
@doc """
Converts a struct to an encodable map, excluding nil values.
Handles nested structs, maps, and lists recursively.
## Examples
iex> block = %ClaudeCode.Content.TextBlock{type: :text, text: "hello"}
iex> ClaudeCode.JSONEncoder.to_encodable(block)
%{type: :text, text: "hello"}
iex> msg = %ClaudeCode.Message.ResultMessage{result: nil, is_error: false, ...}
iex> ClaudeCode.JSONEncoder.to_encodable(msg)
%{is_error: false, ...} # result key excluded
"""
@spec to_encodable(struct()) :: map()
def to_encodable(%{__struct__: _} = struct) do
struct
|> Map.from_struct()
|> drop_nils()
end
defp drop_nils(map) when is_map(map) do
map
|> Enum.reject(fn {_k, v} -> is_nil(v) end)
|> Map.new(fn {k, v} -> {k, process_value(v)} end)
end
defp process_value(%{__struct__: _} = struct), do: to_encodable(struct)
defp process_value(map) when is_map(map), do: drop_nils(map)
defp process_value(list) when is_list(list), do: Enum.map(list, &process_value/1)
defp process_value(other), do: other
end