diff --git a/app.rb b/app.rb
index c0fb7b0..3935d80 100644
--- a/app.rb
+++ b/app.rb
@@ -209,6 +209,16 @@ before do
   request.session_options[:skip] = !request.path_info.start_with?("/session")
 end
 
+helpers do
+  def json(obj, opts: nil, pretty: false)
+    if pretty
+      JSON.pretty_generate obj, opts:
+    else
+      JSON.generate(obj, opts:)
+    end
+  end
+end
+
 get "/" do
   "hello there!\n"
 end