diff --git a/post_parser.py b/post_parser.py
index 4bbd430..fba6aca 100644
--- a/post_parser.py
+++ b/post_parser.py
@@ -303,12 +303,8 @@ class PostParser:
         
         # Add raw JSON debug output if debug is enabled
         if debug:
-            debug_message = copy.deepcopy(message)
-            debug_json = json.dumps(debug_message, default=str, ensure_ascii=False)
-            # Format JSON by replacing braces with newlines
-            formatted_json = debug_json.replace('{', '{\n').replace('}', '\n}').replace(',', ',\n')
-            html_content.append(f'<pre class="debug-json" style="background: #f5f5f5; padding: 10px; margin-top: 20px; overflow-x: auto; font-size: 10px; white-space: pre-wrap;">{formatted_json}</pre>')
-            
+            debug_json = json.dumps(message, indent=2, ensure_ascii=False, default=str)
+            html_content.append(f'<pre class="debug-json" style="background: #f5f5f5; padding: 10px; margin-top: 20px; overflow-x: auto; font-size: 10px; white-space: pre-wrap;">{html.escape(debug_json)}</pre>')
         html_content = '\n'.join(html_content)
         return html_content