diff --git a/home/modules/helix/default.nix b/home/modules/helix/default.nix
index 0c3c859..f6f6e12 100644
--- a/home/modules/helix/default.nix
+++ b/home/modules/helix/default.nix
@@ -84,12 +84,30 @@
               language-servers = [
                 "vscode-json-languageserver"
               ];
+              formatter = {
+                command = "deno";
+                args = [
+                  "fmt"
+                  "-"
+                  "--ext"
+                  "json"
+                ];
+              };
             }
             {
               name = "jsonc";
               language-servers = [
                 "vscode-json-languageserver"
               ];
+              formatter = {
+                command = "deno";
+                args = [
+                  "fmt"
+                  "-"
+                  "--ext"
+                  "jsonc"
+                ];
+              };
             }
           ];
         };