diff --git a/src/CommonItemSet.cc b/src/CommonItemSet.cc
index 11950985..d2531651 100644
--- a/src/CommonItemSet.cc
+++ b/src/CommonItemSet.cc
@@ -1,11 +1,123 @@
 #include "CommonItemSet.hh"
 
 #include "AFSArchive.hh"
+#include "EnemyType.hh"
 #include "GSLArchive.hh"
 #include "StaticGameData.hh"
 
 using namespace std;
 
+template <typename IntT, size_t Count>
+JSON to_json(const parray<IntT, Count>& v) {
+  auto ret = JSON::list();
+  for (size_t z = 0; z < Count; z++) {
+    ret.emplace_back(v[z]);
+  }
+  return ret;
+}
+
+template <typename IntT, size_t Count>
+JSON to_json(const parray<CommonItemSet::Table::Range<IntT>, Count>& v) {
+  auto ret = JSON::list();
+  for (size_t z = 0; z < Count; z++) {
+    ret.emplace_back(to_json(v[z]));
+  }
+  return ret;
+}
+
+template <typename IntT>
+JSON to_json(const CommonItemSet::Table::Range<IntT>& v) {
+  if (v.min == v.max) {
+    return JSON(v.min);
+  } else {
+    return JSON::list({v.min, v.max});
+  }
+}
+
+template <typename IntT, size_t Count1, size_t Count2>
+JSON to_json(const parray<parray<IntT, Count2>, Count1>& v) {
+  auto ret = JSON::list();
+  for (size_t z = 0; z < Count1; z++) {
+    ret.emplace_back(to_json(v[z]));
+  }
+  return ret;
+}
+
+JSON CommonItemSet::Table::json() const {
+  JSON enemy_meseta_ranges_json = JSON::dict();
+  JSON enemy_type_drop_probs_json = JSON::dict();
+  JSON enemy_item_classes_json = JSON::dict();
+  for (size_t z = 0; z < 0x64; z++) {
+    static const array<Episode, 3> episodes = {Episode::EP1, Episode::EP2, Episode::EP4};
+    for (Episode episode : episodes) {
+      JSON enemy_meseta_ranges_episode_json = JSON::dict();
+      JSON enemy_type_drop_probs_episode_json = JSON::dict();
+      JSON enemy_item_classes_episode_json = JSON::dict();
+      for (auto type : enemy_types_for_rare_table_index(episode, z)) {
+        string type_str = name_for_enum(type);
+        enemy_meseta_ranges_episode_json.emplace(type_str, to_json(this->enemy_meseta_ranges[z]));
+        enemy_type_drop_probs_episode_json.emplace(type_str, this->enemy_type_drop_probs[z]);
+        enemy_item_classes_episode_json.emplace(type_str, this->enemy_item_classes[z]);
+      }
+      string name = name_for_episode(episode);
+      enemy_meseta_ranges_json.emplace(name, std::move(enemy_meseta_ranges_episode_json));
+      enemy_type_drop_probs_json.emplace(name, std::move(enemy_type_drop_probs_episode_json));
+      enemy_item_classes_json.emplace(name, std::move(enemy_item_classes_episode_json));
+    }
+  }
+  return JSON::dict({
+      {"BaseWeaponTypeProbTable", to_json(this->base_weapon_type_prob_table)},
+      {"SubtypeBaseTable", to_json(this->subtype_base_table)},
+      {"SubtypeAreaLengthTable", to_json(this->subtype_area_length_table)},
+      {"GrindProbTable", to_json(this->grind_prob_table)},
+      {"ArmorShieldTypeIndexProbTable", to_json(this->armor_shield_type_index_prob_table)},
+      {"ArmorSlotCountProbTable", to_json(this->armor_slot_count_prob_table)},
+      {"EnemyMesetaRanges", std::move(enemy_meseta_ranges_json)},
+      {"EnemyTypeDropProbs", std::move(enemy_type_drop_probs_json)},
+      {"EnemyItemClasses", std::move(enemy_item_classes_json)},
+      {"BoxMesetaRanges", to_json(this->box_meseta_ranges)},
+      {"HasRareBonusValueProbTable", this->has_rare_bonus_value_prob_table},
+      {"BonusValueProbTable", to_json(this->bonus_value_prob_table)},
+      {"NonRareBonusProbSpec", to_json(this->nonrare_bonus_prob_spec)},
+      {"BonusTypeProbTable", to_json(this->bonus_type_prob_table)},
+      {"SpecialMult", to_json(this->special_mult)},
+      {"SpecialPercent", to_json(this->special_percent)},
+      {"ToolClassProbTable", to_json(this->tool_class_prob_table)},
+      {"TechniqueIndexProbTable", to_json(this->technique_index_prob_table)},
+      {"TechniqueLevelRanges", to_json(this->technique_level_ranges)},
+      {"ArmorOrShieldTypeBias", this->armor_or_shield_type_bias},
+      {"UnitMaxStarsTable", to_json(this->unit_max_stars_table)},
+      {"BoxItemClassProbTable", to_json(this->box_item_class_prob_table)},
+  });
+}
+
+JSON CommonItemSet::json() const {
+  auto modes_dict = JSON::dict();
+  static const array<GameMode, 4> modes = {GameMode::NORMAL, GameMode::BATTLE, GameMode::CHALLENGE, GameMode::SOLO};
+  for (const auto& mode : modes) {
+    auto episodes_dict = JSON::dict();
+    static const array<Episode, 3> episodes = {Episode::EP1, Episode::EP2, Episode::EP4};
+    for (const auto& episode : episodes) {
+      auto difficulty_dict = JSON::dict();
+      for (uint8_t difficulty = 0; difficulty < 4; difficulty++) {
+        auto section_id_dict = JSON::dict();
+        for (uint8_t section_id = 0; section_id < 10; section_id++) {
+          try {
+            auto table = this->get_table(episode, mode, difficulty, section_id);
+            section_id_dict.emplace(name_for_section_id(section_id), table->json());
+          } catch (const runtime_error&) {
+          }
+        }
+        difficulty_dict.emplace(token_name_for_difficulty(difficulty), std::move(section_id_dict));
+      }
+      episodes_dict.emplace(token_name_for_episode(episode), std::move(difficulty_dict));
+    }
+    modes_dict.emplace(name_for_mode(mode), std::move(episodes_dict));
+  }
+
+  return modes_dict;
+}
+
 CommonItemSet::Table::Table(const StringReader& r, bool is_big_endian, bool is_v3) {
   if (is_big_endian) {
     this->parse_itempt_t<true>(r, is_v3);
diff --git a/src/CommonItemSet.hh b/src/CommonItemSet.hh
index 329a5fe3..90f40ac9 100644
--- a/src/CommonItemSet.hh
+++ b/src/CommonItemSet.hh
@@ -2,6 +2,7 @@
 
 #include <array>
 #include <phosg/Encoding.hh>
+#include <phosg/JSON.hh>
 
 #include "GSLArchive.hh"
 #include "PSOEncryption.hh"
@@ -45,6 +46,7 @@ public:
     parray<parray<uint8_t, 10>, 7> box_item_class_prob_table;
 
     void print_enemy_table(FILE* stream) const;
+    JSON json() const;
 
   private:
     template <bool IsBigEndian>
@@ -256,6 +258,7 @@ public:
   };
 
   std::shared_ptr<const Table> get_table(Episode episode, GameMode mode, uint8_t difficulty, uint8_t secid) const;
+  JSON json() const;
 
 protected:
   CommonItemSet() = default;
diff --git a/src/HTTPServer.cc b/src/HTTPServer.cc
index bcf8d5c0..43025c4d 100644
--- a/src/HTTPServer.cc
+++ b/src/HTTPServer.cc
@@ -844,6 +844,16 @@ JSON HTTPServer::generate_ep3_cards_json(bool trial) const {
   return index->definitions_json();
 }
 
+JSON HTTPServer::generate_common_tables_json() const {
+  auto [set_v2, set_v3_v4] = call_on_event_thread<pair<shared_ptr<const CommonItemSet>, shared_ptr<const CommonItemSet>>>(this->state->base, [&]() {
+    return make_pair(this->state->common_item_set_v2, this->state->common_item_set_v3_v4);
+  });
+  return JSON::dict({
+      {"v1_v2", set_v2->json()},
+      {"v3_v4", set_v3_v4->json()},
+  });
+}
+
 JSON HTTPServer::generate_rare_tables_json() const {
   auto sets = call_on_event_thread<unordered_map<string, shared_ptr<const RareItemSet>>>(this->state->base, [&]() {
     return this->state->rare_item_sets;
@@ -880,9 +890,10 @@ JSON HTTPServer::generate_rare_table_json(const std::string& table_name) const {
 void HTTPServer::handle_request(struct evhttp_request* req) {
   shared_ptr<const JSON> ret;
   uint32_t serialize_options = 0;
-  try {
-    string uri = evhttp_request_get_uri(req);
+  uint64_t start_time = now();
+  string uri = evhttp_request_get_uri(req);
 
+  try {
     std::unordered_multimap<std::string, std::string> query;
     size_t query_pos = uri.find('?');
     if (query_pos != string::npos) {
@@ -902,6 +913,7 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
       auto endpoints_json = JSON::list({
           "/y/data/ep3-cards",
           "/y/data/ep3-cards-trial",
+          "/y/data/common-tables",
           "/y/data/rare-tables",
           "/y/data/rare-tables/<TABLE-NAME>",
           "/y/data/config",
@@ -918,6 +930,8 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
       ret = make_shared<JSON>(this->generate_ep3_cards_json(false));
     } else if (uri == "/y/data/ep3-cards-trial") {
       ret = make_shared<JSON>(this->generate_ep3_cards_json(true));
+    } else if (uri == "/y/data/common-tables") {
+      ret = make_shared<JSON>(this->generate_common_tables_json());
     } else if (uri == "/y/data/rare-tables") {
       ret = make_shared<JSON>(this->generate_rare_tables_json());
     } else if (!strncmp(uri.c_str(), "/y/data/rare-tables/", 20)) {
@@ -955,13 +969,22 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
     return;
   }
 
+  uint64_t handler_end = now();
   unique_ptr<struct evbuffer, void (*)(struct evbuffer*)> out_buffer(evbuffer_new(), evbuffer_free);
   string* serialized = new string(ret->serialize(JSON::SerializeOption::ESCAPE_CONTROLS_ONLY | serialize_options));
+  size_t size = serialized->size();
+  uint64_t serialize_end = now();
   auto cleanup = +[](const void*, size_t, void* s) -> void {
     delete reinterpret_cast<string*>(s);
   };
   evbuffer_add_reference(out_buffer.get(), serialized->data(), serialized->size(), cleanup, serialized);
   this->send_response(req, 200, "application/json", out_buffer.get());
+
+  string handler_time = format_duration(handler_end - start_time);
+  string serialize_time = format_duration(serialize_end - handler_end);
+  string size_str = format_size(size);
+  server_log.info("[HTTPServer] %s in [handler: %s, serialize: %s, size: %s]",
+      uri.c_str(), handler_time.c_str(), serialize_time.c_str(), size_str.c_str());
 }
 
 void HTTPServer::thread_fn() {
diff --git a/src/HTTPServer.hh b/src/HTTPServer.hh
index 69845f74..f7c9c410 100644
--- a/src/HTTPServer.hh
+++ b/src/HTTPServer.hh
@@ -70,6 +70,7 @@ protected:
   JSON generate_all_json() const;
 
   JSON generate_ep3_cards_json(bool trial) const;
+  JSON generate_common_tables_json() const;
   JSON generate_rare_tables_json() const;
   JSON generate_rare_table_json(const std::string& table_name) const;
 };