diff --git a/js/.prettierignore b/js/.prettierignore
index dee8c1944e..0c9c9eefa9 100644
--- a/js/.prettierignore
+++ b/js/.prettierignore
@@ -1,7 +1,10 @@
 # ignore generated docs
 web/docs/
 
-# this JSON file is too large, so it takes too long to format it.
+# these JSON file is too large, so it takes too long to format it.
+web/test/data/ops/pad-big.jsonc
+web/test/testdata-config.json
+web/test/ort.test.js
 node/test/testdata/squeezenet.input0.json
 
 # ignore dist folder