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13.2.1 Deft

Deft provides a nice interface for browsing and filtering org-roam notes. 

(use-package deft
  :after org
  :bind
  ("C-c n d" . deft)
  :custom
  (deft-recursive t)
  (deft-use-filter-string-for-filename t)
  (deft-default-extension "org")
  (deft-directory "/path/to/org-roam-files/"))

If the title of the Org file is not the first line, you might not get nice titles. You may choose to patch this to use ‘org-roam’’s functionality. Here I’m using el-patch: 

(use-package el-patch
  :straight (:host github
                   :repo "raxod502/el-patch"
                   :branch "develop"))

(eval-when-compile
  (require 'el-patch))

(use-package deft
  ;; same as above...
  :config/el-patch
  (defun deft-parse-title (file contents)
    "Parse the given FILE and CONTENTS and determine the title.
If `deft-use-filename-as-title' is nil, the title is taken to
be the first non-empty line of the FILE.  Else the base name of the FILE is
used as title."
    (el-patch-swap (if deft-use-filename-as-title
                       (deft-base-filename file)
                     (let ((begin (string-match "^.+$" contents)))
                       (if begin
                           (funcall deft-parse-title-function
                                    (substring contents begin (match-end 0))))))
                   (org-roam--get-title-or-slug file))))

The Deft interface can slow down quickly when the number of files get huge. Notdeft is a fork of Deft that uses an external search engine and indexer.