diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index 4c3abfe43..b6875aae0 100644
--- a/.github/workflows/clang-format.yml
+++ b/.github/workflows/clang-format.yml
@@ -18,7 +18,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: install clang-format
-        run:  sudo apt install clang-format
+        run: pip install clang-format
       - name: check-diff
         run: |
           diff=`git-clang-format --diff HEAD^`
diff --git a/include/ylt/coro_io/io_context_pool.hpp b/include/ylt/coro_io/io_context_pool.hpp
index fa406b318..fb951e223 100644
--- a/include/ylt/coro_io/io_context_pool.hpp
+++ b/include/ylt/coro_io/io_context_pool.hpp
@@ -331,7 +331,7 @@ class multithread_context_pool {
   ~multithread_context_pool() { stop(); }
 
   void run() {
-    for (int i = 0; i < thd_num_; i++) {
+    for (size_t i = 0; i < thd_num_; i++) {
       thds_.emplace_back([this] {
         ioc_.run();
       });
diff --git a/include/ylt/coro_rpc/impl/coro_rpc_client.hpp b/include/ylt/coro_rpc/impl/coro_rpc_client.hpp
index 5dc651aae..44d75fa5c 100644
--- a/include/ylt/coro_rpc/impl/coro_rpc_client.hpp
+++ b/include/ylt/coro_rpc/impl/coro_rpc_client.hpp
@@ -139,10 +139,10 @@ struct async_rpc_result_value_t : public detail::async_rpc_result_base {
   T result_;
 
  public:
-  async_rpc_result_value_t(T &&result, resp_body &&buffer,
+  async_rpc_result_value_t(T&& result, resp_body&& buffer,
                            coro_io::data_view attachment)
-      : result_(std::move(result)),
-        async_rpc_result_base(std::move(buffer), attachment) {}
+      : async_rpc_result_base(std::move(buffer), attachment),
+        result_(std::move(result)) {}
   async_rpc_result_value_t(T &&result) : result_(std::move(result)) {}
   T &result() noexcept { return result_; }
   const T &result() const noexcept { return result_; }
@@ -268,11 +268,11 @@ class coro_rpc_client {
    * @param executor coro_io's executor, default executor is come
    */
   coro_rpc_client(
-      coro_io::ExecutorWrapper<> *executor = coro_io::get_global_executor(),
+      coro_io::ExecutorWrapper<>* executor = coro_io::get_global_executor(),
       config conf = {})
-      : control_(std::make_shared<control_t>(executor, false, conf.local_ip)),
-        timer_(std::make_unique<coro_io::period_timer>(
-            executor->get_asio_executor())) {
+      : timer_(std::make_unique<coro_io::period_timer>(
+            executor->get_asio_executor())),
+        control_(std::make_shared<control_t>(executor, false, conf.local_ip)) {
     if (!init_config(conf)) [[unlikely]] {
       close();
     }
@@ -1388,10 +1388,8 @@ class coro_rpc_client {
  private:
   template <auto func, typename Socket, typename... Args>
   async_simple::coro::Lazy<rpc_error> send_request_for_impl(
-      Socket &soc, request_config_t &config, uint32_t &id,
-      coro_io::period_timer &timer, Args &&...args) {
-    using R = decltype(get_return_type<func>());
-
+      Socket& soc, request_config_t& config, uint32_t& id,
+      coro_io::period_timer& timer, Args&&... args) {
     if (control_->has_closed_)
       AS_UNLIKELY {
         ELOG_ERROR << "client has been closed, please re-connect"
@@ -1438,7 +1436,7 @@ class coro_rpc_client {
       char buffer[coro_rpc_protocol::RESP_HEAD_LEN];
       auto tp = std::chrono::steady_clock::now();
       ret = co_await coro_io::async_read(socket, asio::buffer(buffer));
-      auto ec = struct_pack::deserialize_to<
+      [[maybe_unused]] auto ec = struct_pack::deserialize_to<
           struct_pack::sp_config::DISABLE_ALL_META_INFO>(
           header, std::string_view{buffer, buffer + sizeof(buffer)});
       assert(!ec);
diff --git a/include/ylt/coro_rpc/impl/coro_rpc_server.hpp b/include/ylt/coro_rpc/impl/coro_rpc_server.hpp
index 8e20fde80..2733fe8f8 100644
--- a/include/ylt/coro_rpc/impl/coro_rpc_server.hpp
+++ b/include/ylt/coro_rpc/impl/coro_rpc_server.hpp
@@ -87,9 +87,9 @@ class coro_rpc_server_base {
                            conn_timeout_duration = std::chrono::seconds(0),
                        bool is_enable_tcp_no_delay = true)
       : pool_(thread_num),
-        conn_timeout_duration_(conn_timeout_duration),
         flag_{stat::init},
-        is_enable_tcp_no_delay_(is_enable_tcp_no_delay) {
+        is_enable_tcp_no_delay_(is_enable_tcp_no_delay),
+        conn_timeout_duration_(conn_timeout_duration) {
     acceptors_.push_back(
         std::make_unique<coro_io::tcp_server_acceptor>(address, port));
   }
@@ -99,21 +99,21 @@ class coro_rpc_server_base {
                            conn_timeout_duration = std::chrono::seconds(0),
                        bool is_enable_tcp_no_delay = true)
       : pool_(thread_num),
-        conn_timeout_duration_(conn_timeout_duration),
         flag_{stat::init},
-        is_enable_tcp_no_delay_(is_enable_tcp_no_delay) {
+        is_enable_tcp_no_delay_(is_enable_tcp_no_delay),
+        conn_timeout_duration_(conn_timeout_duration) {
     acceptors_.push_back(
         std::make_unique<coro_io::tcp_server_acceptor>(address));
   }
 
   coro_rpc_server_base(
-      const server_config &config,
+      const server_config& config,
       std::vector<std::unique_ptr<coro_io::server_acceptor_base>> acceptors =
           {})
       : pool_(config.thread_num),
-        conn_timeout_duration_(config.conn_timeout_duration),
         flag_{stat::init},
-        is_enable_tcp_no_delay_(config.is_enable_tcp_no_delay) {
+        is_enable_tcp_no_delay_(config.is_enable_tcp_no_delay),
+        conn_timeout_duration_(config.conn_timeout_duration) {
 #ifdef YLT_ENABLE_SSL
     if (config.ssl_config) {
       use_ssl_ = init_ssl_context_helper(context_, config.ssl_config.value());
diff --git a/include/ylt/coro_rpc/impl/protocol/coro_rpc_protocol.hpp b/include/ylt/coro_rpc/impl/protocol/coro_rpc_protocol.hpp
index 6b8584506..f566d5f01 100644
--- a/include/ylt/coro_rpc/impl/protocol/coro_rpc_protocol.hpp
+++ b/include/ylt/coro_rpc/impl/protocol/coro_rpc_protocol.hpp
@@ -105,8 +105,6 @@ struct coro_rpc_protocol {
     if (ec) [[unlikely]] {
       co_return std::move(ec);
     }
-    auto i = struct_pack::get_needed_size<
-        struct_pack::sp_config::DISABLE_ALL_META_INFO>(req_head);
     auto ec2 = struct_pack::deserialize_to<
         struct_pack::sp_config::DISABLE_ALL_META_INFO>(
         req_head,
@@ -179,8 +177,6 @@ struct coro_rpc_protocol {
     if (ec) [[unlikely]] {
       co_return std::move(ec);
     }
-    auto i = struct_pack::get_needed_size<
-        struct_pack::sp_config::DISABLE_ALL_META_INFO>(req_head);
     auto ec2 = struct_pack::deserialize_to<
         struct_pack::sp_config::DISABLE_ALL_META_INFO>(
         req_head,
diff --git a/include/ylt/easylog/appender.hpp b/include/ylt/easylog/appender.hpp
index e263725b1..359949366 100644
--- a/include/ylt/easylog/appender.hpp
+++ b/include/ylt/easylog/appender.hpp
@@ -38,7 +38,7 @@ constexpr char digits[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
 
 template <size_t N, char c>
 inline void to_int(int num, char *p, int &size) {
-  for (int i = 0; i < N; i++) {
+  for (size_t i = 0; i < N; i++) {
     p[--size] = digits[num % 10];
     num = num / 10;
   }
@@ -94,11 +94,11 @@ inline char *get_time_str(const auto &now) {
 class appender {
  public:
   appender() = default;
-  appender(const std::string &filename, bool async, bool enable_console,
+  appender(const std::string& filename, bool async, bool enable_console,
            size_t max_file_size, size_t max_files, bool flush_every_time)
       : has_init_(true),
-        flush_every_time_(flush_every_time),
         enable_console_(enable_console),
+        flush_every_time_(flush_every_time),
         max_file_size_(max_file_size) {
     filename_ = filename;
     max_files_ = (std::min)(max_files, static_cast<size_t>(1000));
diff --git a/include/ylt/standalone/cinatra/coro_http_request.hpp b/include/ylt/standalone/cinatra/coro_http_request.hpp
index 2a3edebb6..bc187930f 100644
--- a/include/ylt/standalone/cinatra/coro_http_request.hpp
+++ b/include/ylt/standalone/cinatra/coro_http_request.hpp
@@ -73,13 +73,13 @@ inline std::vector<std::pair<int, int>> parse_ranges(std::string_view range_str,
       }
     }
 
-    if (start > 0 && (start >= file_size || start == end)) {
+    if (start > 0 && (start >= static_cast<int>(file_size) || start == end)) {
       // out of range
       is_valid = false;
       return {};
     }
 
-    if (end > 0 && end >= file_size) {
+    if (end > 0 && end >= static_cast<int>(file_size)) {
       end = file_size - 1;
     }
 
diff --git a/include/ylt/standalone/cinatra/coro_http_server.hpp b/include/ylt/standalone/cinatra/coro_http_server.hpp
index 0d59fcd41..daed2c3f2 100644
--- a/include/ylt/standalone/cinatra/coro_http_server.hpp
+++ b/include/ylt/standalone/cinatra/coro_http_server.hpp
@@ -609,7 +609,7 @@ class coro_http_server {
                     co_return;
                   }
 
-                  for (int i = 0; i < ranges.size(); i++) {
+                  for (size_t i = 0; i < ranges.size(); i++) {
                     std::string &part_header = multi_heads[i];
                     r = co_await req.get_conn()->write_data(part_header);
                     if (!r) {
@@ -1109,7 +1109,6 @@ class coro_http_server {
     asio::ip::address_v6::bytes_type bytes;
     unsigned long scope_id = 0;
 
-    struct in6_addr addr;
     asio::error_code ec;
     return asio::detail::socket_ops::inet_pton(ASIO_OS_DEF(AF_INET6),
                                                address.data(), &bytes[0],
diff --git a/include/ylt/standalone/cinatra/coro_radix_tree.hpp b/include/ylt/standalone/cinatra/coro_radix_tree.hpp
index 1fffeea26..14c820a87 100644
--- a/include/ylt/standalone/cinatra/coro_radix_tree.hpp
+++ b/include/ylt/standalone/cinatra/coro_radix_tree.hpp
@@ -393,7 +393,7 @@ class radix_tree {
  private:
   int find_pos(const std::string &str, char target, int start) {
     auto i = str.find(target, start);
-    return i == -1 ? str.size() : i;
+    return i == std::string::npos ? str.size() : i;
   }
 
   std::shared_ptr<radix_tree_node> root;
diff --git a/include/ylt/standalone/cinatra/session.hpp b/include/ylt/standalone/cinatra/session.hpp
index 3b3fcbdf6..248cfc962 100644
--- a/include/ylt/standalone/cinatra/session.hpp
+++ b/include/ylt/standalone/cinatra/session.hpp
@@ -69,7 +69,7 @@ class session {
     return session_id_;
   }
 
-  std::size_t get_time_stamp() {
+  std::time_t get_time_stamp() {
     std::unique_lock<std::mutex> lock(mtx_);
     return time_stamp_;
   }
diff --git a/include/ylt/standalone/cinatra/time_util.hpp b/include/ylt/standalone/cinatra/time_util.hpp
index a0eb3345e..0c5e76a1e 100644
--- a/include/ylt/standalone/cinatra/time_util.hpp
+++ b/include/ylt/standalone/cinatra/time_util.hpp
@@ -263,7 +263,7 @@ constexpr std::string_view YMON[12] = {"Jan", "Feb", "Mar", "Apr",
 
 template <size_t N>
 inline void to_int(int num, char c, char *p) {
-  for (int i = 0; i < N; i++) {
+  for (size_t i = 0; i < N; i++) {
     p[N - 1 - i] = digits[num % 10];
     num = num / 10;
   }
@@ -301,7 +301,7 @@ inline std::string_view get_local_time_str(char (&buf)[N], std::time_t t,
 
   char *p = buf;
 
-  for (int i = 0; i < format.size(); ++i) {
+  for (size_t i = 0; i < format.size(); ++i) {
     if (format[i] == '%') {
       char c = i + 2 < format.size() ? format[i + 2] : '0';
       i++;
diff --git a/include/ylt/standalone/cinatra/websocket.hpp b/include/ylt/standalone/cinatra/websocket.hpp
index 953853e15..7a507e5a1 100644
--- a/include/ylt/standalone/cinatra/websocket.hpp
+++ b/include/ylt/standalone/cinatra/websocket.hpp
@@ -184,7 +184,7 @@ class websocket {
   }
 
   void encode_ws_payload(std::span<char> &data) {
-    for (int i = 0; i < data.size(); ++i) {
+    for (size_t i = 0; i < data.size(); ++i) {
       data[i] ^= mask_key_[i % 4];
     }
   }
diff --git a/include/ylt/struct_pack/md5_constexpr.hpp b/include/ylt/struct_pack/md5_constexpr.hpp
index bc21e4988..14c001329 100644
--- a/include/ylt/struct_pack/md5_constexpr.hpp
+++ b/include/ylt/struct_pack/md5_constexpr.hpp
@@ -43,7 +43,7 @@ struct string_literal {
   constexpr bool operator!=(
       const string_literal<CharType, Size2> &other) const {
     if constexpr (Size == Size2) {
-      for (int i = 0; i < Size; ++i) {
+      for (size_t i = 0; i < Size; ++i) {
         if ((*this)[i] != other[i])
           return true;
       }
diff --git a/include/ylt/util/time_util.h b/include/ylt/util/time_util.h
index f9645103b..468238b4f 100644
--- a/include/ylt/util/time_util.h
+++ b/include/ylt/util/time_util.h
@@ -410,7 +410,7 @@ constexpr std::string_view YMON[12] = {"Jan", "Feb", "Mar", "Apr",
 
 template <size_t N>
 inline void to_int(int num, char c, char *p) {
-  for (int i = 0; i < N; i++) {
+  for (size_t i = 0; i < N; i++) {
     p[N - 1 - i] = digits[num % 10];
     num = num / 10;
   }
@@ -448,7 +448,7 @@ inline std::string_view get_local_time_str(char (&buf)[N], std::time_t t,
 
   char *p = buf;
 
-  for (int i = 0; i < format.size(); ++i) {
+  for (size_t i = 0; i < format.size(); ++i) {
     if (format[i] == '%') {
       char c = i + 2 < format.size() ? format[i + 2] : '0';
       i++;