diff --git a/demo/demo.ts b/demo/demo.ts
index 02de6a3..729b712 100644
--- a/demo/demo.ts
+++ b/demo/demo.ts
@@ -23,6 +23,11 @@ function clear(el: Node) {
 }
 
 function objectToDom(object: any) {
+  const detailsEl = document.createElement("details");
+  const summaryEl = document.createElement("summary");
+  summaryEl.append("JSON");
+  detailsEl.open = true;
+  detailsEl.append(summaryEl);
   const preEl = document.createElement("pre");
   const codeEl = document.createElement("code");
   if (typeof object === "string") {
@@ -33,7 +38,8 @@ function objectToDom(object: any) {
     codeEl.append(object);
   }
   preEl.append(codeEl);
-  return preEl;
+  detailsEl.append(preEl);
+  return detailsEl;
 }
 
 async function showResponse(statusEl: Element | null, promise: Promise<any>) {