diff --git a/public/messages/en-US/navbar.json b/public/messages/en-US/navbar.json
index d0fa739..2486514 100644
--- a/public/messages/en-US/navbar.json
+++ b/public/messages/en-US/navbar.json
@@ -1,7 +1,8 @@
 {
-  "title": "LL",
+  "title": "learn-languages",
   "about": "About",
   "sourceCode": "GitHub",
   "login": "Login",
-  "profile": "Profile"
+  "profile": "Profile",
+  "folders": "Folders"
 }
diff --git a/public/messages/zh-CN/navbar.json b/public/messages/zh-CN/navbar.json
index b9514e9..2d7bd12 100644
--- a/public/messages/zh-CN/navbar.json
+++ b/public/messages/zh-CN/navbar.json
@@ -3,5 +3,6 @@
   "about": "关于",
   "sourceCode": "源码",
   "login": "登录",
-  "profile": "个人资料"
+  "profile": "个人资料",
+  "folders": "文件夹"
 }
diff --git a/src/app/api/folders/route.ts b/src/app/api/folders/route.ts
index 1457c8b..4cc893c 100644
--- a/src/app/api/folders/route.ts
+++ b/src/app/api/folders/route.ts
@@ -3,7 +3,7 @@ import { NextRequest, NextResponse } from "next/server";
 import { authOptions } from "../auth/[...nextauth]/route";
 import { FolderController } from "@/lib/db";
 
-export async function GET(req: NextRequest) {
+export async function GET() {
   const session = await getServerSession(authOptions);
   if (session) {
     return new NextResponse(
diff --git a/src/app/folders/FoldersClient.tsx b/src/app/folders/FoldersClient.tsx
new file mode 100644
index 0000000..c8cfe15
--- /dev/null
+++ b/src/app/folders/FoldersClient.tsx
@@ -0,0 +1,103 @@
+"use client";
+
+import DarkButton from "@/components/buttons/DarkButton";
+import LightButton from "@/components/buttons/LightButton";
+import ACard from "@/components/cards/ACard";
+import { Center } from "@/components/Center";
+import {
+  createFolder,
+  deleteFolderById,
+  getFoldersWithTextPairsCountByOwner,
+} from "@/lib/controllers/FolderController";
+import { useEffect, useState } from "react";
+import InFolder from "./InFolder";
+
+interface Folder {
+  id: number;
+  name: string;
+  text_pairs_count: number;
+}
+
+interface FolderProps {
+  folder: Folder;
+  deleteCallback: () => void;
+  openCallback: () => void;
+}
+
+const FolderCard = ({ folder, deleteCallback, openCallback }: FolderProps) => {
+  return (
+    <div className="flex flex-row items-center justify-center border">
+      <div className="flex-1">
+        <div>ID: {folder.id}</div>
+        <div>Name: {folder.name}</div>
+        <div>Text Pairs Count: {folder.text_pairs_count}</div>
+      </div>
+      <DarkButton className="w-fit h-fit m-2" onClick={openCallback}>
+        open
+      </DarkButton>
+      <DarkButton className="w-fit h-fit m-2" onClick={deleteCallback}>
+        delete
+      </DarkButton>
+    </div>
+  );
+};
+
+export default function FoldersClient({ username }: { username: string }) {
+  const [folders, setFolders] = useState<Folder[]>([]);
+  const [page, setPage] = useState<"folders" | "in folder">("folders");
+  const [folderId, setFolderId] = useState<number>(0);
+
+  useEffect(() => {
+    getFoldersWithTextPairsCountByOwner(username).then((folders) => {
+      setFolders(folders as Folder[]);
+    });
+  }, [username]);
+
+  const updateFolders = async () => {
+    const updatedFolders = await getFoldersWithTextPairsCountByOwner(username);
+    setFolders(updatedFolders as Folder[]);
+  };
+
+  if (page === "folders")
+    return (
+      <Center>
+        <ACard className="flex flex-col">
+          <h1 className="text-4xl font-extrabold text-center">Your Folders</h1>
+          <LightButton
+            className="w-fit"
+            onClick={async () => {
+              const folderName = prompt("Enter folder name:");
+              if (!folderName) return;
+              await createFolder(folderName, username);
+              await updateFolders();
+            }}
+          >
+            Create Folder
+          </LightButton>
+          <div className="overflow-y-auto">
+            {folders.map((folder) => (
+              <FolderCard
+                key={folder.id}
+                folder={folder}
+                deleteCallback={() => {
+                  const confirm = prompt(
+                    "Input folder's name to delete this folder.",
+                  );
+                  if (confirm === folder.name) {
+                    deleteFolderById(folder.id).then(updateFolders);
+                  }
+                }}
+                openCallback={() => {
+                  setFolderId(folder.id);
+                  setPage("in folder");
+                }}
+              />
+            ))}
+          </div>
+        </ACard>
+      </Center>
+    );
+  else if (page === "in folder") {
+    return <InFolder username={username} folderId={folderId} />;
+  }
+}
diff --git a/src/app/folders/InFolder.tsx b/src/app/folders/InFolder.tsx
new file mode 100644
index 0000000..156f929
--- /dev/null
+++ b/src/app/folders/InFolder.tsx
@@ -0,0 +1,38 @@
+"use client";
+
+import { getTextPairsByFolderId } from "@/lib/controllers/TextPairController";
+import { useEffect, useState } from "react";
+
+interface Props {
+  username: string;
+  folderId: number;
+}
+
+interface TextPair {
+  id: number;
+  text1: string;
+  text2: string;
+  locale1: string;
+  locale2: string;
+}
+
+export default function InFolder({ folderId }: Props) {
+  const [textPairs, setTextPairs] = useState<TextPair[]>([]);
+
+  useEffect(() => {
+    getTextPairsByFolderId(folderId).then((textPairs) => {
+      setTextPairs(textPairs as TextPair[]);
+    });
+  }, [folderId, textPairs]);
+
+  const updateTextPairs = async () => {
+    const updatedTextPairs = await getTextPairsByFolderId(folderId);
+    setTextPairs(updatedTextPairs as TextPair[]);
+  };
+  
+  return (
+    <div>
+      <h1>In Folder</h1>
+    </div>
+  );
+}
diff --git a/src/app/folders/page.tsx b/src/app/folders/page.tsx
new file mode 100644
index 0000000..12bb8f9
--- /dev/null
+++ b/src/app/folders/page.tsx
@@ -0,0 +1,10 @@
+import FoldersClient from "./FoldersClient";
+import { redirect } from "next/navigation";
+import { getServerSession } from "next-auth";
+export default async function FoldersPage() {
+  const session = await getServerSession();
+  if (!session?.user?.name) redirect(`/login`);
+  return (
+    <FoldersClient username={session.user.name} />
+  );
+}
diff --git a/src/app/profile/page.tsx b/src/app/profile/page.tsx
index 5aa7e32..5ef21c0 100644
--- a/src/app/profile/page.tsx
+++ b/src/app/profile/page.tsx
@@ -36,19 +36,7 @@ export default function MePage() {
         <p>{session.data?.user?.name}</p>
         <p>Email: {session.data?.user?.email}</p>
         <DarkButton onClick={signOut}>Logout</DarkButton>
-        <LightButton
-          onClick={() => {
-            fetch("/api/folders", {
-              method: "POST",
-              headers: {
-                "Content-Type": "application/json",
-              },
-              body: JSON.stringify({ name: "New Folder" }),
-            }).then(async (res) => console.log(await res.json()));
-          }}
-        >
-          POST
-        </LightButton>
+        
       </ACard>
     </Center>
   );
diff --git a/src/components/Navbar.tsx b/src/components/Navbar.tsx
index 9e96dfb..ef38600 100644
--- a/src/components/Navbar.tsx
+++ b/src/components/Navbar.tsx
@@ -35,17 +35,20 @@ export function Navbar() {
   const session = useSession();
   return (
     <div className="flex justify-between items-center w-full h-16 px-8 bg-[#35786f] text-white">
-      <Link href={"/"} className="text-xl flex">
-        <Image
-          src={"/favicon.ico"}
-          alt="logo"
-          width="32"
-          height="32"
-          className="rounded-4xl"
-        ></Image>
-        <span className="font-bold">{t("title")}</span>
-      </Link>
-      <div className="flex gap-4 text-xl">
+      <div className="flex gap-4 text-xl justify-center items-center">
+        <Link href={"/"} className="text-xl flex border-b">
+          <Image
+            src={"/favicon.ico"}
+            alt="logo"
+            width="32"
+            height="32"
+            className="rounded-4xl"
+          ></Image>
+          <span className="font-bold text-pink-200">{t("title")}</span>
+        </Link>
+        <MyLink href="/folders">{t("folders")}</MyLink>
+      </div>
+      <div className="flex gap-4 text-xl justify-center items-center">
         <div className="relative">
           {showLanguageMenu && (
             <div>
diff --git a/src/lib/controllers/FolderController.ts b/src/lib/controllers/FolderController.ts
new file mode 100644
index 0000000..ea18164
--- /dev/null
+++ b/src/lib/controllers/FolderController.ts
@@ -0,0 +1,50 @@
+"use server";
+
+import { pool } from "../db";
+
+export async function deleteFolderById(id: number) {
+  try {
+    await pool.query("DELETE FROM folders WHERE id = $1", [id]);
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function getFoldersByOwner(owner: string) {
+  try {
+    const folders = await pool.query("SELECT * FROM folders WHERE owner = $1", [
+      owner,
+    ]);
+    return folders.rows;
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function getFoldersWithTextPairsCountByOwner(owner: string) {
+  try {
+    const folders = await pool.query(
+      `select f.id, f.name, f.owner, count(tp.id) as text_pairs_count from folders f
+    left join text_pairs tp on tp.folder_id = f.id
+    where f.owner = $1
+    group by f.id, f.name, f.owner`,
+      [owner],
+    );
+    return folders.rows;
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function createFolder(name: string, owner: string) {
+  try {
+    return (
+      await pool.query("INSERT INTO folders (name, owner) VALUES ($1, $2)", [
+        name.trim(),
+        owner,
+      ])
+    ).rows[0];
+  } catch (e) {
+    console.log(e);
+  }
+}
diff --git a/src/lib/controllers/TextPairController.ts b/src/lib/controllers/TextPairController.ts
new file mode 100644
index 0000000..431b88b
--- /dev/null
+++ b/src/lib/controllers/TextPairController.ts
@@ -0,0 +1,69 @@
+"use server";
+
+import { pool } from "../db";
+
+export async function createTextPair(
+  locale1: string,
+  locale2: string,
+  text1: string,
+  text2: string,
+  folderId: number,
+) {
+  try {
+    await pool.query(
+      "INSERT INTO text_pairs (locale1, locale2, text1, text2, folder_id) VALUES ($1, $2, $3, $4, $5)",
+      [locale1.trim(), locale2.trim(), text1.trim(), text2.trim(), folderId],
+    );
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function deleteTextPairById(id: number) {
+  try {
+    await pool.query("DELETE FROM text_pairs WHERE id = $1", [id]);
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function updateWordPairById(
+  id: number,
+  locale1: string,
+  locale2: string,
+  text1: string,
+  text2: string,
+) {
+  try {
+    await pool.query(
+      "UPDATE text_pairs SET locale1 = $1, locale2 = $2, text1 = $3, text2 = $4 WHERE id = $5",
+      [locale1.trim(), locale2.trim(), text1.trim(), text2.trim(), id],
+    );
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function getTextPairsByFolderId(folderId: number) {
+  try {
+    const textPairs = await pool.query(
+      "SELECT * FROM text_pairs WHERE folder_id = $1",
+      [folderId],
+    );
+    return textPairs.rows;
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+export async function getTextPairsCountByFolderId(folderId: number) {
+  try {
+    const count = await pool.query(
+      "SELECT COUNT(*) FROM text_pairs WHERE folder_id = $1",
+      [folderId],
+    );
+    return count.rows[0].count;
+  } catch (e) {
+    console.log(e);
+  }
+}
diff --git a/src/lib/db.ts b/src/lib/db.ts
index ea2902f..249e7cc 100644
--- a/src/lib/db.ts
+++ b/src/lib/db.ts
@@ -1,4 +1,3 @@
-import bcrypt from "bcryptjs";
 import { Pool } from "pg";
 
 export const pool = new Pool({
@@ -9,141 +8,3 @@ export const pool = new Pool({
   connectionTimeoutMillis: 2000,
   maxLifetimeSeconds: 60,
 });
-
-export class UserController {
-  static async createUser(username: string, password: string) {
-    const encodedPassword = await bcrypt.hash(password, 10);
-    try {
-      await pool.query(
-        "INSERT INTO users (username, password) VALUES ($1, $2)",
-        [username, encodedPassword],
-      );
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async getUserByUsername(username: string) {
-    try {
-      const user = await pool.query("SELECT * FROM users WHERE username = $1", [
-        username,
-      ]);
-      return user.rows[0];
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async deleteUserById(id: number) {
-    try {
-      await pool.query("DELETE FROM users WHERE id = $1", [id]);
-    } catch (e) {
-      console.log(e);
-    }
-  }
-}
-
-export class FolderController {
-  static async getFolderById(id: number) {
-    try {
-      const folder = await pool.query("SELECT * FROM folders WHERE id = $1", [
-        id,
-      ]);
-      return folder.rows[0];
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async deleteFolderById(id: number) {
-    try {
-      await pool.query("DELETE FROM folders WHERE id = $1", [id]);
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async getFoldersByOwner(owner: string) {
-    try {
-      const folders = await pool.query(
-        "SELECT * FROM folders WHERE owner = $1",
-        [owner],
-      );
-      return folders.rows;
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async createFolder(name: string, owner: string) {
-    try {
-      return (
-        await pool.query("INSERT INTO folders (name, owner) VALUES ($1, $2)", [
-          name,
-          owner,
-        ])
-      ).rows[0];
-    } catch (e) {
-      console.log(e);
-    }
-  }
-}
-
-export class WordPairController {
-  static async createWordPair(
-    locale1: string,
-    locale2: string,
-    text1: string,
-    text2: string,
-    folderId: number,
-  ) {
-    try {
-      await pool.query(
-        "INSERT INTO word_pairs (locale1, locale2, text1, text2, folder_id) VALUES ($1, $2, $3, $4, $5)",
-        [locale1, locale2, text1, text2, folderId],
-      );
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async getWordPairById(id: number) {
-    try {
-      const wordPair = await pool.query(
-        "SELECT * FROM word_pairs WHERE id = $1",
-        [id],
-      );
-      return wordPair.rows[0];
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async deleteWordPairById(id: number) {
-    try {
-      await pool.query("DELETE FROM word_pairs WHERE id = $1", [id]);
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async updateWordPairById(
-    id: number,
-    locale1: string,
-    locale2: string,
-    text1: string,
-    text2: string,
-  ) {
-    try {
-      await pool.query(
-        "UPDATE word_pairs SET locale1 = $1, locale2 = $2, text1 = $3, text2 = $4 WHERE id = $5",
-        [locale1, locale2, text1, text2, id],
-      );
-    } catch (e) {
-      console.log(e);
-    }
-  }
-  static async getWordPairsByFolderId(folderId: number) {
-    try {
-      const wordPairs = await pool.query(
-        "SELECT * FROM word_pairs WHERE folder_id = $1",
-        [folderId],
-      );
-      return wordPairs.rows;
-    } catch (e) {
-      console.log(e);
-    }
-  }
-}
diff --git a/src/interfaces.ts b/src/lib/interfaces.ts
similarity index 100%
rename from src/interfaces.ts
rename to src/lib/interfaces.ts
diff --git a/src/utils.ts b/src/lib/utils.ts
similarity index 100%
rename from src/utils.ts
rename to src/lib/utils.ts