init.lua

local function dump_nodes()
  -- Export all node names to a text file for review
  print("Exporting Nodes")
  local i = 0
  local result = {}
  for name, _def in pairs(minetest.registered_nodes) do
    i = i + 1

    result[i] = name
  end

  minetest.safe_file_write(minetest.get_worldpath() .. "/exported_nodes.txt", table.concat(result, "\n"))
  print("Exported Nodes count=" .. i)
end

minetest.register_on_mods_loaded(function ()
  dump_nodes()
end)

mod.conf

name = node_dump
description = Dumps all registered nodes to a text file