diff --git a/deno2/tools/format.sh b/deno2/tools/format.sh
index a5c3241756..69d7099193 100755
--- a/deno2/tools/format.sh
+++ b/deno2/tools/format.sh
@@ -4,4 +4,4 @@ clang-format -i -style Google *.cc *.h include/*.h
 gn format BUILD.gn
 gn format .gn
 yapf -i tools/*.py
-prettier --write js/*.ts js/*.js
+prettier --write js/*.ts js/*.js js/*.json