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If you want to remove all trailing whitespace in a file in Neovim, use this command:

:%s/\s\+$//e

Explanation:

• :%s → substitute across the entire file
• \s\+$ → matches one or more spaces or tabs at the end of a line
• //e → suppress errors if no match is found

Optional: Automatically remove trailing whitespace on save:

Vimscript version (init.vim):

autocmd BufWritePre * :%s/\s\+$//e

Lua version (init.lua):

vim.api.nvim_create_autocmd("BufWritePre", {
  pattern = "*",
  command = [[%s/\s\+$//e]],
})

This ensures your files are always clean of trailing spaces.