diff --git a/src/main.cpp b/src/main.cpp
index 29b271e..747d583 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -40,22 +40,16 @@ int main(int argc, char const *argv[])
   }
 
   std::ofstream f("../activity.json");
-  // f << "{" << std::endl;
-  // for (const auto &[key, val] : activity)
-  // {
-  //   f << "\t\"" << key << "\": {\"u\": " << val.at("u") << ", \"n\": " << val.at("n") << "}," << std::endl;
-  // }
-  // f.seekp((long)f.tellp() - 2);
-  // f << std::endl << "}" << std::endl;
-  
-  //{ date: "2025-09-09", u: 186, n: 80 }
-  f << "[" << std::endl;
-  for (const auto &[key, val] : activity)
-  {
-    f << "\t{\"date\": \"" << key << "\", \"u\": " << val.at("u") << ", \"n\": " << val.at("n") << "}," << std::endl;
+  f << "[\n";
+  auto it = activity.begin();
+  auto eit = activity.end();
+  while (it != eit) {
+    const auto& [key, val] = *it;
+    f << "\t{\"date\": \"" << key << "\", \"u\": " << val.at("u") << ", \"n\": " << val.at("n") << "}";
+    ++it != eit ? f << ",\n" : f << "\n";
   }
-  f.seekp((long)f.tellp() - 2);
-  f << std::endl << "]" << std::endl;
+  f << "]";
+  f.close();
 
   auto end = std::chrono::steady_clock::now();