diff --git a/nix/formatter.nix b/nix/formatter.nix
index 17b291d..1ebf0d1 100644
--- a/nix/formatter.nix
+++ b/nix/formatter.nix
@@ -4,11 +4,12 @@
 
   perSystem = _: {
     treefmt = {
+      # https://flake.parts/options/treefmt-nix
       projectRootFile = ".git/config";
       programs.nixfmt.enable = true;
       programs.terraform.enable = true;
       programs.hclfmt.enable = true;
-      programs.jsonfmt.enable = true;
+      programs.deno.enable = true;
       programs.yamlfmt.enable = true;
       programs.black.enable = true;
     };