diff --git a/client/src/api/services/rss.ts b/client/src/api/services/rss.ts
index a655a23..bf7a84e 100644
--- a/client/src/api/services/rss.ts
+++ b/client/src/api/services/rss.ts
@@ -1,8 +1,7 @@
 import { BLOG } from "@/constants/endpoints";
 
 import { axiosInstance } from "@/api/instance";
-import { RegisterRss } from "@/types/rss";
-import { RegisterResponse } from "@/types/rss";
+import { RegisterRss, RegisterResponse } from "@/types/rss";
 
 export const registerRss = async (data: RegisterRss): Promise<RegisterResponse> => {
   const response = await axiosInstance.post<RegisterResponse>(BLOG.RSS.REGISTRER_RSS, data);
diff --git a/client/src/components/RssRegistration/RssUrlInput.tsx b/client/src/components/RssRegistration/RssUrlInput.tsx
index c6e34af..644a722 100644
--- a/client/src/components/RssRegistration/RssUrlInput.tsx
+++ b/client/src/components/RssRegistration/RssUrlInput.tsx
@@ -7,7 +7,6 @@ interface RssUrlInputProps {
   platform: PlatformType;
   value: string;
   onChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
-  placeholder?: string;
 }
 
 export const RssUrlInput = ({ platform, value, onChange }: RssUrlInputProps) => {
diff --git a/client/src/components/admin/layout/AdminMember.tsx b/client/src/components/admin/layout/AdminMember.tsx
index b64a55c..6e30e9d 100644
--- a/client/src/components/admin/layout/AdminMember.tsx
+++ b/client/src/components/admin/layout/AdminMember.tsx
@@ -25,7 +25,7 @@ export default function AdminMember() {
   const onError = (error: AxiosError) => {
     const errorMessage =
       typeof error.response?.data === "string" ? error.response.data : error.response?.data || error.message;
-    alert(`관리자 등록 실패: ${errorMessage}`);
+    alert(`관리자 등록 실패: ${JSON.stringify(errorMessage)}`);
   };
 
   const handleChange = (e: React.ChangeEvent<HTMLInputElement>, name: string) => {
diff --git a/client/src/components/chart/PieChartItem.tsx b/client/src/components/chart/PieChartItem.tsx
index 74c51bf..4066ff8 100644
--- a/client/src/components/chart/PieChartItem.tsx
+++ b/client/src/components/chart/PieChartItem.tsx
@@ -43,7 +43,7 @@ export default function PieChartItem({ data, title }: BarType) {
             <ChartTooltip content={<ChartTooltipContent hideLabel />} />
             <Pie data={data} dataKey="count" nameKey="platform">
               {data.map((entry, index) => (
-                <Cell key={`cell-${index}`} fill={chartConfig[entry.platform]?.color || "#ccc"} />
+                <Cell key={`cell-${index}`} fill={chartConfig[entry.platform]?.color ?? "#ccc"} />
               ))}
               <LabelList dataKey="platform" className="fill-background" stroke="none" fontSize={12} />
             </Pie>
diff --git a/client/src/components/chat/ChatButton.tsx b/client/src/components/chat/ChatButton.tsx
index 5f0cafa..30ece7b 100644
--- a/client/src/components/chat/ChatButton.tsx
+++ b/client/src/components/chat/ChatButton.tsx
@@ -1,5 +1,4 @@
-import { MessageCircleMore } from "lucide-react";
-import { X } from "lucide-react";
+import { MessageCircleMore, X } from "lucide-react";
 
 import { useSidebar } from "@/components/ui/sidebar";
 
diff --git a/client/src/components/chat/ChatItem.tsx b/client/src/components/chat/ChatItem.tsx
index f5af9fb..2879d7c 100644
--- a/client/src/components/chat/ChatItem.tsx
+++ b/client/src/components/chat/ChatItem.tsx
@@ -18,18 +18,16 @@ export default function ChatItem({ chatItem, isSameUser }: ChatItemProps) {
   return (
     <div className="flex flex-col ">
       {!isSameUser ? (
-        <>
-          <span className="flex gap-1 items-center text-left">
-            <Avatar>
-              <Avvvatars value={chatItem.username} style="shape" />
-            </Avatar>
-            {/* 이름, 시간 */}
-            <span className="flex gap-2 items-center inline-block">
-              <span className="text-sm">{chatItem.username}</span>
-              <span className="text-xs">{formatTime(chatItem.timestamp)}</span>
-            </span>
+        <span className="flex gap-1 items-center text-left">
+          <Avatar>
+            <Avvvatars value={chatItem.username} style="shape" />
+          </Avatar>
+          {/* 이름, 시간 */}
+          <span className="flex gap-2 items-center inline-block">
+            <span className="text-sm">{chatItem.username}</span>
+            <span className="text-xs">{formatTime(chatItem.timestamp)}</span>
           </span>
-        </>
+        </span>
       ) : (
         <></>
       )}
diff --git a/client/src/components/chat/layout/ChatFooter.tsx b/client/src/components/chat/layout/ChatFooter.tsx
index 55a54ea..8417f61 100644
--- a/client/src/components/chat/layout/ChatFooter.tsx
+++ b/client/src/components/chat/layout/ChatFooter.tsx
@@ -6,11 +6,10 @@ import { SheetFooter } from "@/components/ui/sheet";
 
 import { useKeyboardShortcut } from "@/hooks/common/useKeyboardShortcut";
 
-import { useChatValueStroe } from "@/store/useChatStore";
-import { useChatStore } from "@/store/useChatStore";
+import { useChatValueStore, useChatStore } from "@/store/useChatStore";
 
 export default function ChatFooter() {
-  const { message, setMessage } = useChatValueStroe();
+  const { message, setMessage } = useChatValueStore();
   const { sendMessage } = useChatStore();
 
   const handleSendMessage = () => {
diff --git a/client/src/components/chat/layout/ChatSection.tsx b/client/src/components/chat/layout/ChatSection.tsx
index c808380..55c25c1 100644
--- a/client/src/components/chat/layout/ChatSection.tsx
+++ b/client/src/components/chat/layout/ChatSection.tsx
@@ -7,43 +7,49 @@ import ChatSkeleton from "@/components/chat/layout/ChatSkeleton";
 import { ScrollArea } from "@/components/ui/scroll-area";
 
 import { useChatStore } from "@/store/useChatStore";
+import { ChatType } from "@/types/chat";
+
+const FullChatWarning = () => (
+  <div className="flex flex-col justify-center items-center h-full mt-[30vh]">
+    <CircleAlert color="red" size={200} />
+    <p>채팅창 인원이 500명 이상입니다</p>
+    <p>잠시 기다렸다가 새로고침을 해주세요</p>
+  </div>
+);
+
+const RenderHistory = ({ chatHistory, isFull }: { chatHistory: ChatType[]; isFull: boolean }) => {
+  if (chatHistory.length === 0) return <ChatSkeleton number={14} />;
+  return isFull ? (
+    <FullChatWarning />
+  ) : (
+    <span className="flex flex-col gap-3 px-3">
+      {chatHistory.map((item, index) => {
+        const isSameUser = index > 0 && chatHistory[index - 1]?.username === item.username;
+        return <ChatItem key={item.timestamp} chatItem={item} isSameUser={isSameUser} />;
+      })}
+    </span>
+  );
+};
 
 export default function ChatSection({ isFull }: { isFull: boolean }) {
   const scrollRef = useRef<HTMLDivElement>(null);
   const { chatHistory } = useChatStore();
+
   useEffect(() => {
     if (scrollRef.current) {
       const scrollContent = scrollRef.current.querySelector("[data-radix-scroll-area-viewport]");
-      if (scrollContent) {
+      if (scrollContent && chatHistory.length > 0) {
         scrollContent.scrollTo({
           top: scrollContent.scrollHeight,
           behavior: "smooth",
         });
       }
     }
-  }, [chatHistory]);
-
-  const RenderHistory = () => {
-    if (chatHistory.length === 0) return <ChatSkeleton number={14} />;
-    return isFull ? (
-      <div className="flex flex-col justify-center items-center h-full mt-[30vh]">
-        <CircleAlert color="red" size={200} />
-        <p>채팅창 인원이 500명 이상입니다</p>
-        <p>잠시 기다렸다가 새로고침을 해주세요</p>
-      </div>
-    ) : (
-      <span className="flex flex-col gap-3  px-3">
-        {chatHistory.map((item, index) => {
-          const isSameUser = index > 0 && chatHistory[index - 1].username === item.username;
-          return <ChatItem key={index} chatItem={item} isSameUser={isSameUser} />;
-        })}
-      </span>
-    );
-  };
+  }, [chatHistory.length]);
 
   return (
     <ScrollArea ref={scrollRef} className="h-full">
-      {RenderHistory()}
+      <RenderHistory chatHistory={chatHistory} isFull={isFull} />
     </ScrollArea>
   );
 }
diff --git a/client/src/components/layout/Header.tsx b/client/src/components/layout/Header.tsx
index cbc5be0..cc83e4e 100644
--- a/client/src/components/layout/Header.tsx
+++ b/client/src/components/layout/Header.tsx
@@ -43,9 +43,9 @@ export default function Header() {
       <div className="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
         <div className="h-20 items-center overflow-hidden flex justify-between relative z-50">
           {/* 로고 영역 */}
-          <div className="flex-shrink-0 relative z-50">
-            <img className="h-14 w-auto cursor-pointer" src={logo} alt="Logo" onClick={() => location.reload()} />
-          </div>
+          <button className="flex-shrink-0 relative z-50" onClick={() => location.reload()}>
+            <img className="h-14 w-auto cursor-pointer" src={logo} alt="Logo" />
+          </button>
 
           {/* 중앙 검색 버튼 */}
           <div className="absolute left-1/2 transform -translate-x-1/2 w-full flex justify-center z-40">
diff --git a/client/src/components/layout/SideButton.tsx b/client/src/components/layout/SideButton.tsx
index 2295c33..8a1f31d 100644
--- a/client/src/components/layout/SideButton.tsx
+++ b/client/src/components/layout/SideButton.tsx
@@ -1,6 +1,4 @@
-import { Home } from "lucide-react";
-import { ArrowUp } from "lucide-react";
-import { ChartArea } from "lucide-react";
+import { Home, ArrowUp, ChartArea } from "lucide-react";
 
 import { Chat } from "@/components/chat/Chat";
 import { OpenChat } from "@/components/chat/ChatButton";
diff --git a/client/src/components/search/SearchButton.tsx b/client/src/components/search/SearchButton.tsx
index e13e2c2..25ed438 100644
--- a/client/src/components/search/SearchButton.tsx
+++ b/client/src/components/search/SearchButton.tsx
@@ -2,7 +2,7 @@ import { Search } from "lucide-react";
 
 export default function SearchButton({ handleSearchModal }: { handleSearchModal: () => void }) {
   return (
-    <div
+    <button
       className="w-full px-4 py-3 
                    bg-white 
                    border border-primary 
@@ -21,6 +21,6 @@ export default function SearchButton({ handleSearchModal }: { handleSearchModal:
     >
       <span className="text-sm font-medium">검색</span>
       <Search size={16} className="text-primary group-hover:text-secondary transition-colors" />
-    </div>
+    </button>
   );
 }
diff --git a/client/src/components/search/SearchFilters/FilterButton.tsx b/client/src/components/search/SearchFilters/FilterButton.tsx
index 2e601c7..159a918 100644
--- a/client/src/components/search/SearchFilters/FilterButton.tsx
+++ b/client/src/components/search/SearchFilters/FilterButton.tsx
@@ -34,14 +34,14 @@ export default function FilterButton() {
     <CommandGroup heading="필터">
       <div className="flex flex-col gap-1">
         {filterOptions.map(({ label, filter, icon }) => (
-          <div
+          <button
             key={filter}
             className={getItemClassName(currentFilter === filter)}
             onClick={() => handleFilterClick(filter)}
           >
             {icon}
             <span>{label}</span>
-          </div>
+          </button>
         ))}
       </div>
     </CommandGroup>
diff --git a/client/src/components/search/SearchHigilight.tsx b/client/src/components/search/SearchHigilight.tsx
index a224833..1b3af00 100644
--- a/client/src/components/search/SearchHigilight.tsx
+++ b/client/src/components/search/SearchHigilight.tsx
@@ -1,3 +1,5 @@
+import { useMemo } from "react";
+
 interface SearchHighlightProps {
   text: string;
   highlight: string;
@@ -8,8 +10,11 @@ function escapeRegExp(string: string): string {
 }
 
 export default function SearchHighlight({ text, highlight }: SearchHighlightProps) {
-  const escapedHighlight = escapeRegExp(highlight);
-  const parts = text.split(new RegExp(`(${escapedHighlight})`, "gi"));
+  const parts = useMemo(() => {
+    if (!highlight) return [text];
+    const escapedHighlight = escapeRegExp(highlight);
+    return text.split(new RegExp(`(${escapedHighlight})`, "gi"));
+  }, [text, highlight]);
 
   return (
     <>
diff --git a/client/src/components/search/SearchResults/SearchResultList.tsx b/client/src/components/search/SearchResults/SearchResultList.tsx
index 740ff55..7ad837b 100644
--- a/client/src/components/search/SearchResults/SearchResultList.tsx
+++ b/client/src/components/search/SearchResults/SearchResultList.tsx
@@ -18,8 +18,8 @@ export default function SearchResults() {
     page,
     pageSize: RESULT_PER_PAGE,
   });
-  const totalItems = data?.data.totalCount || 0;
-  const totalPages = data?.data.totalPages || 0;
+  const totalItems = data?.data.totalCount ?? 0;
+  const totalPages = data?.data.totalPages ?? 0;
   const results = data?.data.result || [];
   const renderContent = {
     //검색 전
diff --git a/client/src/hooks/queries/useInfiniteScrollQuery.ts b/client/src/hooks/queries/useInfiniteScrollQuery.ts
index 2587b93..9f9d001 100644
--- a/client/src/hooks/queries/useInfiniteScrollQuery.ts
+++ b/client/src/hooks/queries/useInfiniteScrollQuery.ts
@@ -19,7 +19,7 @@ export function useInfiniteScrollQuery<T extends Identifiable>({
     queryFn: ({ pageParam = 0 }) =>
       fetchFn({
         limit: 12,
-        lastId: pageParam as number,
+        lastId: pageParam,
       }),
     getNextPageParam: (lastPage) => {
       if (!lastPage.hasMore) return undefined;
diff --git a/client/src/hooks/queries/useSearch.ts b/client/src/hooks/queries/useSearch.ts
index 6b35a1f..d9be53b 100644
--- a/client/src/hooks/queries/useSearch.ts
+++ b/client/src/hooks/queries/useSearch.ts
@@ -2,7 +2,6 @@ import { useState, useEffect } from "react";
 
 import { debounce } from "@/utils/debounce";
 
-// import axios from "axios"; //mockAPI사용시
 import { getSearch } from "@/api/services/search";
 import { SearchRequest } from "@/types/search";
 import { useQuery, useQueryClient } from "@tanstack/react-query";
diff --git a/client/src/store/useChatStore.ts b/client/src/store/useChatStore.ts
index 5971d7c..2d8ebb5 100644
--- a/client/src/store/useChatStore.ts
+++ b/client/src/store/useChatStore.ts
@@ -17,6 +17,39 @@ interface ChatStore {
 export const useChatStore = create<ChatStore>((set) => {
   let socket: Socket | null = null;
 
+  // 소켓 초기화 함수
+  const initializeSocket = () => {
+    if (socket) return socket; // 이미 존재하면 그대로 반환
+
+    socket = io(CHAT_SERVER_URL, {
+      path: "/chat",
+      transports: ["websocket"],
+      reconnection: true, // 자동 재연결 활성화
+      reconnectionAttempts: 5, // 최대 5번 재시도
+      reconnectionDelay: 1000, // 1초 간격으로 재시도
+    });
+
+    // 서버 연결 성공 시
+    socket.on("connect", () => {});
+
+    // 서버로부터 메시지 받기
+    socket.on("message", (data) => {
+      set((state) => ({
+        chatHistory: [...state.chatHistory, data],
+      }));
+    });
+
+    // 사용자 수 업데이트 받기
+    socket.on("updateUserCount", (data) => {
+      set({ userCount: data.userCount });
+    });
+
+    // 서버 연결 해제 시
+    socket.on("disconnect", () => {});
+
+    return socket;
+  };
+
   return {
     chatHistory: [],
     userCount: 0,
@@ -24,25 +57,7 @@ export const useChatStore = create<ChatStore>((set) => {
     // Socket 연결 함수
     connect: () => {
       if (socket) return; // 이미 연결된 경우 중복 방지
-
-      socket = io(CHAT_SERVER_URL, { path: "/chat", transports: ["websocket"] });
-
-      // 서버 연결 성공 시
-      socket.on("connect", () => {});
-      // 서버로부터 메시지 받기
-      socket.on("message", (data) => {
-        set((state) => ({
-          chatHistory: [...state.chatHistory, data],
-        }));
-      });
-
-      // 사용자 수 업데이트 받기
-      socket.on("updateUserCount", (data) => {
-        set({ userCount: data.userCount });
-      });
-
-      // 서버 연결 해제 시
-      socket.on("disconnect", () => {});
+      initializeSocket();
     },
 
     // Socket 연결 해제 함수
@@ -54,28 +69,39 @@ export const useChatStore = create<ChatStore>((set) => {
     // 이전 채팅 기록 받아오기
     getHistory: () => {
       if (socket) {
+        socket.emit("getHistory");
         socket.on("chatHistory", (data) => {
           set(() => ({
             chatHistory: data,
           }));
         });
       } else {
+        const newSocket = initializeSocket();
+        newSocket.emit("getHistory");
       }
     },
+
     // 메시지 전송 함수
     sendMessage: (message: string) => {
       if (socket) {
         socket.emit("message", { message });
       } else {
+        // 소켓이 없으면 연결 후 메시지 전송
+        const newSocket = initializeSocket();
+        newSocket.on("connect", () => {
+          newSocket.emit("message", { message });
+        });
       }
     },
   };
 });
+
 interface ChatValue {
   message: string;
   setMessage: (newMessage: string) => void;
 }
-export const useChatValueStroe = create<ChatValue>((set) => ({
+
+export const useChatValueStore = create<ChatValue>((set) => ({
   message: "",
   setMessage: (newMessage: string) => set({ message: newMessage }),
 }));