cljfmt is included with both Clojure-LSP and CIDER, so if you have either installed it should work out of the box.

With LSP mode the standard `lsp-format-region` and `lsp-format-buffer` commands should work, and on the CIDER side `cider-format-defun`, `cider-format-region` and `cider-format-buffer` should also invoke cljfmt.