Dune is a sandbox for Elixir and aims to safely evaluate user-provided code.

You can try it out using this basic Elixir playground made with Dune
and LiveView.

iex> Dune.eval_string("IO.puts('Hello world!')")
%Dune.Success{inspected: ":ok", stdio: "Hello world!\n", value: :ok}

iex> Dune.eval_string("File.cwd!()")
%Dune.Failure{message: "** (DuneRestrictedError) function File.cwd!/0 is restricted", type: :restricted}

Github: https://github.com/functional-rewire/dune

While only a subset of Elixir is supported due to safety concerns, Dune aims to keep this subset fairly large, including:

• a good chunk of the standard library
• atoms (without leaks)
• module definition (without actual modules), including recursion

My hope is that Dune can help build fun projects such as tutorials or coding games in Elixir.
But use it carefully: evaluating user-provided code on a server is highly dangerous and Dune is still early-stage.

If you manage to break out of the sandbox or find any bug, please open an issue on Github or PM me on this forum (sorry, I don’t offer any bounty ).

Happy coding!