How do I set up blink.cmp as a faster, Rust-powered completion engine in Neovim?

Explanation

blink.cmp is a completion plugin for Neovim with its core fuzzy-matching logic written in Rust, making it significantly faster than pure-Lua alternatives like nvim-cmp — especially on large projects. It supports LSP, buffer, path, and snippet sources out of the box with native Neovim snippet support.

How it works

Install with lazy.nvim:

{
  'saghen/blink.cmp',
  event = 'InsertEnter',
  build = 'cargo build --release',
  opts = {
    keymap = { preset = 'default' },
    appearance = { use_nvim_cmp_as_default = false },
    sources = { default = { 'lsp', 'path', 'snippets', 'buffer' } },
  },
}

Default keymaps (preset default):

• <C-space> — open completion menu
• <CR> — confirm selection
• <Tab> / <S-Tab> — select next/previous item
• <C-b> / <C-f> — scroll documentation window
• <C-e> — dismiss the menu

Example

Once installed, blink.cmp activates automatically in insert mode and shows completions with documentation previews. The Rust-compiled fuzzy matcher handles typos and transpositions (e.g., typing prnt still matches print).

Tips

• blink.cmp natively reads vim.lsp.protocol.make_client_capabilities() — no extra config needed for LSP
• Use sources.providers to add third-party sources (e.g., blink-cmp-ripgrep, blink-cmp-git)
• The build step requires Rust; use version = '*' with build = false to download a prebuilt binary instead
• Set opts.completion.documentation.auto_show = true to show documentation side-by-side by default