diff --git a/app/controllers/petitions_controller.rb b/app/controllers/petitions_controller.rb
index c2d9b13f9..d673e53c4 100644
--- a/app/controllers/petitions_controller.rb
+++ b/app/controllers/petitions_controller.rb
@@ -102,7 +102,9 @@ def redirect_to_home_page_if_dissolved
   end
 
   def redirect_to_home_page_unless_opened
-    redirect_to home_url unless Parliament.opened?
+    unless json_request?
+      redirect_to home_url unless Parliament.opened?
+    end
   end
 
   def request_format
diff --git a/spec/controllers/petitions_controller_spec.rb b/spec/controllers/petitions_controller_spec.rb
index 43a3690e3..12977fcae 100644
--- a/spec/controllers/petitions_controller_spec.rb
+++ b/spec/controllers/petitions_controller_spec.rb
@@ -501,6 +501,11 @@
         get :index
         expect(response).to redirect_to("https://petition.parliament.uk/")
       end
+
+      it "doesn't redirect JSON requests" do
+        get :index, as: :json
+        expect(response).to be_successful
+      end
     end
   end