diff --git a/.changeset/major-actors-stand.md b/.changeset/major-actors-stand.md
new file mode 100644
index 0000000000..ababe1adc0
--- /dev/null
+++ b/.changeset/major-actors-stand.md
@@ -0,0 +1,5 @@
+---
+'@backstage/backend-defaults': patch
+---
+
+DefaultActionsRegistryService: add json middleware to /.backstage/actions/ routes only
diff --git a/packages/backend-defaults/src/alpha/entrypoints/actionsRegistry/DefaultActionsRegistryService.ts b/packages/backend-defaults/src/alpha/entrypoints/actionsRegistry/DefaultActionsRegistryService.ts
index 1f6f108589..2c14caaeb3 100644
--- a/packages/backend-defaults/src/alpha/entrypoints/actionsRegistry/DefaultActionsRegistryService.ts
+++ b/packages/backend-defaults/src/alpha/entrypoints/actionsRegistry/DefaultActionsRegistryService.ts
@@ -90,7 +90,7 @@ export class DefaultActionsRegistryService implements ActionsRegistryService {
 
   createRouter(): Router {
     const router = PromiseRouter();
-    router.use(json());
+    router.use('/.backstage/actions/', json());
 
     router.get('/.backstage/actions/v1/actions', async (req, res) => {
       const credentials = await this.httpAuth.credentials(req);