What is Elixir LS? Elixir LS by Jake Becker (now maintained by the elixir-lsp organization) is the language server implementation for Elixir. What is a language server? If you've been following the story of Visual Studio Code, there is a chance you've heard of another recent creation from Microsoft: the Language Server Protocol. The Language Server Protocol (LSP) defines the protocol used between an editor or IDE and a language server that provides language features like auto complete, go to ...