diff --git a/js/src/i18n/langs.json b/js/src/i18n/langs.json
index e0a717dd7..9a651d89d 100644
--- a/js/src/i18n/langs.json
+++ b/js/src/i18n/langs.json
@@ -15,6 +15,7 @@
   "hu": "Magyar",
   "id": "Bahasa Indonesia",
   "it": "Italiano",
+  "ja": "日本語",
   "nl": "Nederlands",
   "nn": "Nynorsk",
   "oc": "Occitan",