diff --git a/team_product/database/app.db b/team_product/database/app.db
new file mode 100644
index 0000000..c4be2a0
Binary files /dev/null and b/team_product/database/app.db differ
diff --git a/team_product/package-lock.json b/team_product/package-lock.json
new file mode 100644
index 0000000..3aed839
--- /dev/null
+++ b/team_product/package-lock.json
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+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
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+        "mime-types": "~2.1.24"
+      },
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+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/unpipe": {
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
diff --git a/team_product/package.json b/team_product/package.json
index 54f5f81..ee44a3f 100644
--- a/team_product/package.json
+++ b/team_product/package.json
@@ -10,8 +10,8 @@
     "db:reset": "npx prisma migrate reset"
   },
   "dependencies": {
-    "express": "^4.18.2",
-    "@prisma/client": "^5.7.0"
+    "@prisma/client": "^5.22.0",
+    "express": "^4.22.1"
   },
   "devDependencies": {
     "prisma": "^5.7.0"
diff --git a/team_product/prisma/migrations/20260227050735_init/migration.sql b/team_product/prisma/migrations/20260227050735_init/migration.sql
new file mode 100644
index 0000000..ed47e7b
--- /dev/null
+++ b/team_product/prisma/migrations/20260227050735_init/migration.sql
@@ -0,0 +1,7 @@
+-- CreateTable
+CREATE TABLE "Item" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "title" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
diff --git a/team_product/prisma/migrations/20260227053501_add_completed/migration.sql b/team_product/prisma/migrations/20260227053501_add_completed/migration.sql
new file mode 100644
index 0000000..d1fab86
--- /dev/null
+++ b/team_product/prisma/migrations/20260227053501_add_completed/migration.sql
@@ -0,0 +1,15 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Item" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "title" TEXT NOT NULL,
+    "completed" BOOLEAN NOT NULL DEFAULT false,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+INSERT INTO "new_Item" ("createdAt", "id", "title", "updatedAt") SELECT "createdAt", "id", "title", "updatedAt" FROM "Item";
+DROP TABLE "Item";
+ALTER TABLE "new_Item" RENAME TO "Item";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;
diff --git a/team_product/prisma/migrations/20260227061729_init/migration.sql b/team_product/prisma/migrations/20260227061729_init/migration.sql
new file mode 100644
index 0000000..620b86a
--- /dev/null
+++ b/team_product/prisma/migrations/20260227061729_init/migration.sql
@@ -0,0 +1,20 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `completed` on the `Item` table. All the data in the column will be lost.
+
+*/
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Item" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "title" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+INSERT INTO "new_Item" ("createdAt", "id", "title", "updatedAt") SELECT "createdAt", "id", "title", "updatedAt" FROM "Item";
+DROP TABLE "Item";
+ALTER TABLE "new_Item" RENAME TO "Item";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;
diff --git a/team_product/prisma/migrations/20260227063115_sync_completed/migration.sql b/team_product/prisma/migrations/20260227063115_sync_completed/migration.sql
new file mode 100644
index 0000000..d1fab86
--- /dev/null
+++ b/team_product/prisma/migrations/20260227063115_sync_completed/migration.sql
@@ -0,0 +1,15 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Item" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "title" TEXT NOT NULL,
+    "completed" BOOLEAN NOT NULL DEFAULT false,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+INSERT INTO "new_Item" ("createdAt", "id", "title", "updatedAt") SELECT "createdAt", "id", "title", "updatedAt" FROM "Item";
+DROP TABLE "Item";
+ALTER TABLE "new_Item" RENAME TO "Item";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;
diff --git a/team_product/prisma/migrations/migration_lock.toml b/team_product/prisma/migrations/migration_lock.toml
new file mode 100644
index 0000000..e5e5c47
--- /dev/null
+++ b/team_product/prisma/migrations/migration_lock.toml
@@ -0,0 +1,3 @@
+# Please do not edit this file manually
+# It should be added in your version-control system (i.e. Git)
+provider = "sqlite"
\ No newline at end of file
diff --git a/team_product/prisma/schema.prisma b/team_product/prisma/schema.prisma
index ec4e6f2..de18bb2 100644
--- a/team_product/prisma/schema.prisma
+++ b/team_product/prisma/schema.prisma
@@ -13,8 +13,9 @@ datasource db {
 // アイテムモデル
 // シンプルなCRUDアプリの基本データ構造
 model Item {
-  id        Int      @id @default(autoincrement())  // 自動採番のID
-  title     String                                   // アイテム名
-  createdAt DateTime @default(now())                // 作成日時
-  updatedAt DateTime @updatedAt                     // 更新日時
+  id        Int      @id @default(autoincrement()) // 自動採番のID
+  title     String // アイテム名
+  completed Boolean  @default(false) // 完了フラグ
+  createdAt DateTime @default(now()) // 作成日時
+  updatedAt DateTime @updatedAt // 更新日時
 }
diff --git a/team_product/src/package-lock.json b/team_product/src/package-lock.json
new file mode 100644
index 0000000..3316a5f
--- /dev/null
+++ b/team_product/src/package-lock.json
@@ -0,0 +1,417 @@
+{
+  "name": "src",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "src",
+      "version": "1.0.0",
+      "license": "ISC",
+      "devDependencies": {
+        "prisma": "^6.19.2"
+      }
+    },
+    "node_modules/@prisma/config": {
+      "version": "6.19.2",
+      "resolved": "https://registry.npmjs.org/@prisma/config/-/config-6.19.2.tgz",
+      "integrity": "sha512-kadBGDl+aUswv/zZMk9Mx0C8UZs1kjao8H9/JpI4Wh4SHZaM7zkTwiKn/iFLfRg+XtOAo/Z/c6pAYhijKl0nzQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "c12": "3.1.0",
+        "deepmerge-ts": "7.1.5",
+        "effect": "3.18.4",
+        "empathic": "2.0.0"
+      }
+    },
+    "node_modules/@prisma/debug": {
+      "version": "6.19.2",
+      "resolved": "https://registry.npmjs.org/@prisma/debug/-/debug-6.19.2.tgz",
+      "integrity": "sha512-lFnEZsLdFLmEVCVNdskLDCL8Uup41GDfU0LUfquw+ercJC8ODTuL0WNKgOKmYxCJVvFwf0OuZBzW99DuWmoH2A==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/@prisma/engines": {
+      "version": "6.19.2",
+      "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-6.19.2.tgz",
+      "integrity": "sha512-TTkJ8r+uk/uqczX40wb+ODG0E0icVsMgwCTyTHXehaEfb0uo80M9g1aW1tEJrxmFHeOZFXdI2sTA1j1AgcHi4A==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@prisma/debug": "6.19.2",
+        "@prisma/engines-version": "7.1.1-3.c2990dca591cba766e3b7ef5d9e8a84796e47ab7",
+        "@prisma/fetch-engine": "6.19.2",
+        "@prisma/get-platform": "6.19.2"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@prisma/engines-version/-/engines-version-7.1.1-3.c2990dca591cba766e3b7ef5d9e8a84796e47ab7.tgz",
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+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/@prisma/fetch-engine": {
+      "version": "6.19.2",
+      "resolved": "https://registry.npmjs.org/@prisma/fetch-engine/-/fetch-engine-6.19.2.tgz",
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+      "version": "0.6.5",
+      "resolved": "https://registry.npmjs.org/nypm/-/nypm-0.6.5.tgz",
+      "integrity": "sha512-K6AJy1GMVyfyMXRVB88700BJqNUkByijGJM8kEHpLdcAt+vSQAVfkWWHYzuRXHSY6xA2sNc5RjTj0p9rE2izVQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "citty": "^0.2.0",
+        "pathe": "^2.0.3",
+        "tinyexec": "^1.0.2"
+      },
+      "bin": {
+        "nypm": "dist/cli.mjs"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/nypm/node_modules/citty": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/citty/-/citty-0.2.1.tgz",
+      "integrity": "sha512-kEV95lFBhQgtogAPlQfJJ0WGVSokvLr/UEoFPiKKOXF7pl98HfUVUD0ejsuTCld/9xH9vogSywZ5KqHzXrZpqg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/ohash": {
+      "version": "2.0.11",
+      "resolved": "https://registry.npmjs.org/ohash/-/ohash-2.0.11.tgz",
+      "integrity": "sha512-RdR9FQrFwNBNXAr4GixM8YaRZRJ5PUWbKYbE5eOsrwAjJW0q2REGcf79oYPsLyskQCZG1PLN+S/K1V00joZAoQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/pathe": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/pathe/-/pathe-2.0.3.tgz",
+      "integrity": "sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/perfect-debounce": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/perfect-debounce/-/perfect-debounce-1.0.0.tgz",
+      "integrity": "sha512-xCy9V055GLEqoFaHoC1SoLIaLmWctgCUaBaWxDZ7/Zx4CTyX7cJQLJOok/orfjZAh9kEYpjJa4d0KcJmCbctZA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/pkg-types": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/pkg-types/-/pkg-types-2.3.0.tgz",
+      "integrity": "sha512-SIqCzDRg0s9npO5XQ3tNZioRY1uK06lA41ynBC1YmFTmnY6FjUjVt6s4LoADmwoig1qqD0oK8h1p/8mlMx8Oig==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "confbox": "^0.2.2",
+        "exsolve": "^1.0.7",
+        "pathe": "^2.0.3"
+      }
+    },
+    "node_modules/prisma": {
+      "version": "6.19.2",
+      "resolved": "https://registry.npmjs.org/prisma/-/prisma-6.19.2.tgz",
+      "integrity": "sha512-XTKeKxtQElcq3U9/jHyxSPgiRgeYDKxWTPOf6NkXA0dNj5j40MfEsZkMbyNpwDWCUv7YBFUl7I2VK/6ALbmhEg==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@prisma/config": "6.19.2",
+        "@prisma/engines": "6.19.2"
+      },
+      "bin": {
+        "prisma": "build/index.js"
+      },
+      "engines": {
+        "node": ">=18.18"
+      },
+      "peerDependencies": {
+        "typescript": ">=5.1.0"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/pure-rand": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-6.1.0.tgz",
+      "integrity": "sha512-bVWawvoZoBYpp6yIoQtQXHZjmz35RSVHnUOTefl8Vcjr8snTPY1wnpSPMWekcFwbxI6gtmT7rSYPFvz71ldiOA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/dubzzz"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fast-check"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/rc9": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/rc9/-/rc9-2.1.2.tgz",
+      "integrity": "sha512-btXCnMmRIBINM2LDZoEmOogIZU7Qe7zn4BpomSKZ/ykbLObuBdvG+mFq11DL6fjH1DRwHhrlgtYWG96bJiC7Cg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "defu": "^6.1.4",
+        "destr": "^2.0.3"
+      }
+    },
+    "node_modules/readdirp": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",
+      "integrity": "sha512-GDhwkLfywWL2s6vEjyhri+eXmfH6j1L7JE27WhqLeYzoh/A3DBaYGEj2H/HFZCn/kMfim73FXxEJTw06WtxQwg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 14.18.0"
+      },
+      "funding": {
+        "type": "individual",
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/tinyexec": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.0.2.tgz",
+      "integrity": "sha512-W/KYk+NFhkmsYpuHq5JykngiOCnxeVL8v8dFnqxSD8qEEdRfXk1SDM6JzNqcERbcGYj9tMrDQBYV9cjgnunFIg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    }
+  }
+}
diff --git a/team_product/src/package.json b/team_product/src/package.json
new file mode 100644
index 0000000..648d1b9
--- /dev/null
+++ b/team_product/src/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "src",
+  "version": "1.0.0",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "devDependencies": {
+    "prisma": "^6.19.2"
+  }
+}
diff --git a/team_product/src/public/app.js b/team_product/src/public/app.js
index 91e0dfb..c11e00e 100644
--- a/team_product/src/public/app.js
+++ b/team_product/src/public/app.js
@@ -4,19 +4,25 @@
  * このコードはブラウザ上で動作します。
  * ログはブラウザのF12（開発者ツール）に表示されます。
  *
- * 現在の機能: Create（追加）、Read（一覧表示）
+ * 現在の機能: Create（追加）、Read（一覧表示）、Search（検索）、Update（編集）、Complete（完了）、Delete（削除）
  */
 
 // =====================================================
 // DOM要素の取得
 // =====================================================
-const titleInput = document.getElementById('titleInput')
-const addButton = document.getElementById('addButton')
-const itemList = document.getElementById('itemList')
-const emptyMessage = document.getElementById('emptyMessage')
+const titleInput = document.getElementById("titleInput");
+const addButton = document.getElementById("addButton");
+const searchButton = document.getElementById("searchButton");
+const searchForm = document.getElementById("searchForm");
+const searchInput = document.getElementById("searchInput");
+const searchStartButton = document.getElementById("searchStartButton");
+const itemList = document.getElementById("itemList");
+const emptyMessage = document.getElementById("emptyMessage");
+let currentSearchKeyword = "";
+let activeSearchToken = 0;
 
 // ページ読み込み時にログ出力
-console.log('[CLIENT] ページが読み込まれました')
+console.log("[CLIENT] ページが読み込まれました");
 
 // =====================================================
 // API呼び出し関数
@@ -31,72 +37,283 @@ console.log('[CLIENT] ページが読み込まれました')
  * - Output: 画面にアイテムを表示
  */
 async function loadItems() {
-  console.log('[CLIENT] アイテム一覧を取得中...')
+  console.log("[CLIENT] アイテム一覧を取得中...");
 
   try {
     // サーバーにリクエスト（この時点でServer層に処理が移る）
-    const response = await fetch('/api/items')
-    const items = await response.json()
+    const response = await fetch("/api/items");
+    const items = await response.json();
 
-    console.log('[CLIENT] 取得完了:', items.length, '件')
+    console.log("[CLIENT] 取得完了:", items.length, "件");
 
     // 画面を更新
-    renderItems(items)
+    renderItems(items, "");
   } catch (error) {
-    console.error('[CLIENT] エラー:', error)
-    alert('アイテムの取得に失敗しました')
+    console.error("[CLIENT] エラー:", error);
+    alert("アイテムの取得に失敗しました");
+  }
+}
+
+/**
+ * アイテムを検索して表示
+ *
+ * IPO:
+ * - Input: 検索文字列keyword
+ * - Process: サーバーへ検索リクエスト → DBで部分一致検索
+ * - Output: 一致したアイテムのみ表示
+ */
+async function searchItems(keyword, token = activeSearchToken) {
+  console.log("[CLIENT] アイテムを検索:", keyword);
+
+  try {
+    const response = await fetch(
+      `/api/items/search?keyword=${encodeURIComponent(keyword)}`,
+    );
+
+    if (!response.ok) {
+      const error = await response.json();
+      throw new Error(error.error);
+    }
+
+    const items = await response.json();
+
+    if (token !== activeSearchToken || currentSearchKeyword !== keyword) {
+      return;
+    }
+
+    renderItems(items, currentSearchKeyword);
+    console.log("[CLIENT] 検索完了:", items.length, "件");
+  } catch (error) {
+    console.error("[CLIENT] エラー:", error);
+    alert("検索に失敗しました: " + error.message);
   }
 }
 
+/**
+ * 現在の表示条件で一覧を再取得
+ *
+ * IPO:
+ * - Input: なし
+ * - Process: 検索中なら検索、通常時は全件取得
+ * - Output: 最新一覧を表示
+ */
+async function refreshItems() {
+  if (currentSearchKeyword) {
+    await searchItems(currentSearchKeyword, activeSearchToken);
+    return;
+  }
+
+  await loadItems();
+}
+
 /**
  * アイテムを追加
  *
  * IPO:
- * - Input: テキストボックスのタイトル
+ * - Input: テキストボックスのname
  * - Process: サーバーにPOSTリクエスト → DB保存
  * - Output: 一覧を再読み込み
  */
 async function addItem() {
-  const title = titleInput.value.trim()
+  const name = titleInput.value.trim();
 
   // 入力チェック（Client側のバリデーション）
-  if (!title) {
-    alert('タイトルを入力してください')
-    return
+  if (!name) {
+    alert("nameを入力してください");
+    return;
   }
 
-  console.log('[CLIENT] アイテムを追加:', title)
+  console.log("[CLIENT] アイテムを追加:", name);
 
   try {
     // サーバーにPOSTリクエスト
-    const response = await fetch('/api/items', {
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ title })
-    })
+    const response = await fetch("/api/items", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ title: name }),
+    });
 
     if (!response.ok) {
-      const error = await response.json()
-      throw new Error(error.error)
+      const error = await response.json();
+      throw new Error(error.error);
     }
 
     // 入力欄をクリア
-    titleInput.value = ''
+    titleInput.value = "";
 
     // 一覧を再読み込み
-    await loadItems()
+    await refreshItems();
+
+    console.log("[CLIENT] 追加完了");
+  } catch (error) {
+    console.error("[CLIENT] エラー:", error);
+    alert("追加に失敗しました: " + error.message);
+  }
+}
+
+// =====================================================
+// Complete機能
+// =====================================================
+
+/**
+ * アイテムの完了をトグル
+ *
+ * IPO:
+ * - Input: チェックボックスクリック（アイテムID）
+ * - Process: サーバーにPATCHリクエスト → DB更新
+ * - Output: 一覧を再読み込み（完了itemは下に表示）
+ */
+async function completeItem(id) {
+  console.log('[CLIENT] アイテムを完了切替: ID =', id)
+
+  try {
+    const response = await fetch(`/api/items/${id}/complete`, {
+      method: 'PATCH'
+    })
 
-    console.log('[CLIENT] 追加完了')
+    if (!response.ok) {
+      const error = await response.json()
+      throw new Error(error.error)
+    }
+
+    await refreshItems()
+    console.log('[CLIENT] 完了切替完了')
   } catch (error) {
     console.error('[CLIENT] エラー:', error)
-    alert('追加に失敗しました: ' + error.message)
+    alert('完了切替に失敗しました: ' + error.message)
   }
 }
 
 // =====================================================
-// ここに新しい機能（Delete, Updateなど）を追加していこう！
+// Update機能
 // =====================================================
 
+/**
+ * アイテム名（name）を更新
+ *
+ * IPO:
+ * - Input: 編集ボタン押下後に入力されたname
+ * - Process: PUTリクエストでServerへ編集要求 → DB更新
+ * - Output: 更新後一覧を再描画
+ */
+async function updateItem(id, nameInput) {
+  const name = nameInput.value.trim();
+
+  if (!name) {
+    alert("nameを入力してください");
+    return;
+  }
+
+  console.log("[CLIENT] アイテムを更新:", id, name);
+
+  try {
+    const response = await fetch(`/api/items/${id}`, {
+      method: "PUT",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ name }),
+    });
+
+    if (!response.ok) {
+      const error = await response.json();
+      throw new Error(error.error);
+    }
+
+    await refreshItems();
+    console.log("[CLIENT] 更新完了");
+  } catch (error) {
+    console.error("[CLIENT] エラー:", error);
+    alert("更新に失敗しました: " + error.message);
+  }
+}
+
+/**
+ * 削除確認モーダルを表示
+ *
+ * IPO:
+ * - Input: なし
+ * - Process: はい / いいえ の選択を待つ
+ * - Output: ユーザー選択をbooleanで返す
+ */
+function showDeleteConfirm() {
+  return new Promise((resolve) => {
+    const overlay = document.createElement("div");
+    overlay.className = "confirm-overlay";
+
+    const dialog = document.createElement("div");
+    dialog.className = "confirm-dialog";
+
+    const message = document.createElement("p");
+    message.className = "confirm-message";
+    message.textContent = "削除してもよろしいですか？";
+
+    const buttonArea = document.createElement("div");
+    buttonArea.className = "confirm-actions";
+
+    const yesButton = document.createElement("button");
+    yesButton.className = "item-button confirm-yes-button";
+    yesButton.textContent = "はい";
+
+    const noButton = document.createElement("button");
+    noButton.className = "item-button confirm-no-button";
+    noButton.textContent = "いいえ";
+
+    const closeDialog = (result) => {
+      document.body.removeChild(overlay);
+      resolve(result);
+    };
+
+    yesButton.addEventListener("click", () => closeDialog(true));
+    noButton.addEventListener("click", () => closeDialog(false));
+    overlay.addEventListener("click", (event) => {
+      if (event.target === overlay) {
+        closeDialog(false);
+      }
+    });
+
+    buttonArea.appendChild(yesButton);
+    buttonArea.appendChild(noButton);
+    dialog.appendChild(message);
+    dialog.appendChild(buttonArea);
+    overlay.appendChild(dialog);
+    document.body.appendChild(overlay);
+  });
+}
+
+/**
+ * アイテムを削除
+ *
+ * IPO:
+ * - Input: 削除対象のid
+ * - Process: 確認後にDELETEリクエストでServerへ削除要求 → DB削除
+ * - Output: 更新後一覧を再描画
+ */
+async function deleteItem(id) {
+  const shouldDelete = await showDeleteConfirm();
+  if (!shouldDelete) {
+    console.log("[CLIENT] 削除をキャンセル:", id);
+    return;
+  }
+
+  console.log("[CLIENT] アイテムを削除:", id);
+
+  try {
+    const response = await fetch(`/api/items/${id}`, {
+      method: "DELETE",
+    });
+
+    if (!response.ok) {
+      const error = await response.json();
+      throw new Error(error.error);
+    }
+
+    await refreshItems();
+    console.log("[CLIENT] 削除完了");
+  } catch (error) {
+    console.error("[CLIENT] エラー:", error);
+    alert("削除に失敗しました: " + error.message);
+  }
+}
+
 // =====================================================
 // 画面描画関数
 // =====================================================
@@ -104,31 +321,158 @@ async function addItem() {
 /**
  * アイテム一覧を画面に描画
  */
-function renderItems(items) {
+function renderItems(items, keyword = "") {
   // リストをクリア
-  itemList.innerHTML = ''
+  itemList.innerHTML = "";
 
   // 空メッセージの表示/非表示
-  emptyMessage.style.display = items.length === 0 ? 'block' : 'none'
+  emptyMessage.style.display = items.length === 0 ? "block" : "none";
+
+  // 未完了を上、完了を下に並び替え
+  const sorted = [...items].sort((a, b) => a.completed - b.completed)
 
   // 各アイテムを描画
-  items.forEach(item => {
+  sorted.forEach(item => {
     const li = document.createElement('li')
-    li.className = 'item'
-    li.innerHTML = `
-      <span class="item-title">${escapeHtml(item.title)}</span>
-    `
+    li.className = item.completed ? 'item item-completed' : 'item'
+
+    const checkbox = document.createElement('input')
+    checkbox.type = 'checkbox'
+    checkbox.className = 'item-checkbox'
+    checkbox.checked = item.completed
+    checkbox.addEventListener('change', () => completeItem(item.id))
+
+    const nameText = createHighlightedTitleElement(item.title, keyword);
+
+    const actions = document.createElement("div");
+    actions.className = "item-actions";
+
+    const editButton = document.createElement("button");
+    editButton.className = "item-button edit-button";
+    editButton.textContent = "編集";
+    editButton.addEventListener("click", () => {
+      const nameInput = document.createElement("input");
+      nameInput.type = "text";
+      nameInput.className = "edit-input";
+      nameInput.value = item.title;
+
+      const doneButton = document.createElement("button");
+      doneButton.className = "item-button done-button";
+      doneButton.textContent = "完了";
+      doneButton.addEventListener("click", () => {
+        updateItem(item.id, nameInput);
+      });
+
+      actions.innerHTML = "";
+      li.replaceChild(nameInput, nameText);
+      actions.appendChild(doneButton);
+      nameInput.focus();
+    });
+
+    const deleteButton = document.createElement("button");
+    deleteButton.className = "item-button delete-button";
+    deleteButton.textContent = "削除";
+    deleteButton.addEventListener("click", () => {
+      deleteItem(item.id);
+    });
+
+    actions.appendChild(editButton)
+    actions.appendChild(deleteButton)
+    li.appendChild(checkbox)
+    li.appendChild(nameText)
+    li.appendChild(actions)
     itemList.appendChild(li)
   })
 }
 
 /**
- * HTMLエスケープ（XSS対策）
+ * タイトル中の部分一致箇所をマーカー表示
+ *
+ * IPO:
+ * - Input: タイトル文字列と検索文字列
+ * - Process: 一致箇所を抽出してマーカー要素を構築
+ * - Output: 描画用のspan要素を返す
  */
-function escapeHtml(text) {
-  const div = document.createElement('div')
-  div.textContent = text
-  return div.innerHTML
+function createHighlightedTitleElement(title, keyword) {
+  const titleElement = document.createElement("span");
+  titleElement.className = "item-title";
+
+  if (!keyword) {
+    titleElement.textContent = title;
+    return titleElement;
+  }
+
+  const lowerTitle = title.toLowerCase();
+  const lowerKeyword = keyword.toLowerCase();
+  let startIndex = 0;
+
+  while (startIndex < title.length) {
+    const matchIndex = lowerTitle.indexOf(lowerKeyword, startIndex);
+
+    if (matchIndex === -1) {
+      titleElement.appendChild(document.createTextNode(title.slice(startIndex)));
+      break;
+    }
+
+    if (matchIndex > startIndex) {
+      titleElement.appendChild(
+        document.createTextNode(title.slice(startIndex, matchIndex)),
+      );
+    }
+
+    const marker = document.createElement("span");
+    marker.className = "highlight-marker";
+    marker.textContent = title.slice(matchIndex, matchIndex + keyword.length);
+    titleElement.appendChild(marker);
+    startIndex = matchIndex + keyword.length;
+  }
+
+  return titleElement;
+}
+
+/**
+ * 検索フォーム表示を切り替え
+ *
+ * IPO:
+ * - Input: 検索ボタン押下
+ * - Process: フォームを開閉、閉じる時は一覧を通常表示へ戻す
+ * - Output: 画面表示を更新
+ */
+async function toggleSearchForm() {
+  const isHidden = searchForm.classList.contains("hidden");
+
+  if (isHidden) {
+    searchForm.classList.remove("hidden");
+    searchInput.focus();
+    return;
+  }
+
+  searchForm.classList.add("hidden");
+  searchInput.value = "";
+  currentSearchKeyword = "";
+  activeSearchToken += 1;
+  await loadItems();
+}
+
+/**
+ * 検索開始
+ *
+ * IPO:
+ * - Input: 検索ボックスの文字列
+ * - Process: 検索APIを呼び出す
+ * - Output: 一致データのみ表示
+ */
+async function startSearch() {
+  const keyword = searchInput.value.trim();
+
+  if (!keyword) {
+    alert("検索文字列を入力してください");
+    return;
+  }
+
+  currentSearchKeyword = keyword;
+  activeSearchToken += 1;
+  await searchItems(keyword, activeSearchToken);
 }
 
 // =====================================================
@@ -136,18 +480,26 @@ function escapeHtml(text) {
 // =====================================================
 
 // 追加ボタンクリック
-addButton.addEventListener('click', addItem)
+addButton.addEventListener("click", addItem);
+searchButton.addEventListener("click", toggleSearchForm);
+searchStartButton.addEventListener("click", startSearch);
 
 // Enterキーで追加
-titleInput.addEventListener('keypress', (e) => {
-  if (e.key === 'Enter') {
-    addItem()
+titleInput.addEventListener("keypress", (e) => {
+  if (e.key === "Enter") {
+    addItem();
+  }
+});
+
+searchInput.addEventListener("keypress", (e) => {
+  if (e.key === "Enter") {
+    startSearch();
   }
-})
+});
 
 // =====================================================
 // 初期化
 // =====================================================
 
 // ページ読み込み時にアイテム一覧を取得
-loadItems()
+loadItems();
diff --git a/team_product/src/public/index.html b/team_product/src/public/index.html
index 5b52dc6..8cbfa70 100644
--- a/team_product/src/public/index.html
+++ b/team_product/src/public/index.html
@@ -1,43 +1,57 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="ja">
-<head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Base App</title>
-  <link rel="stylesheet" href="style.css">
-</head>
-<body>
-  <div class="container">
-    <!-- ヘッダー -->
-    <header>
-      <h1>Base App</h1>
-      <p class="subtitle">シンプルなリストアプリ</p>
-    </header>
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Base App</title>
+    <link rel="stylesheet" href="style.css" />
+  </head>
+  <body>
+    <div class="container">
+      <!-- ヘッダー -->
+      <header>
+        <h1>Base App</h1>
+        <p class="subtitle">シンプルなリストアプリ</p>
+      </header>
 
-    <!-- アイテム追加フォーム -->
-    <section class="add-form">
-      <input
-        type="text"
-        id="titleInput"
-        placeholder="新しいアイテムを入力..."
-        autocomplete="off"
-      >
-      <button id="addButton">追加</button>
-    </section>
+      <!-- アイテム追加フォーム -->
+      <section class="add-form">
+        <input
+          type="text"
+          id="titleInput"
+          placeholder="新しいnameを入力..."
+          autocomplete="off"
+        />
+        <button id="addButton">追加</button>
+      </section>
 
-    <!-- アイテム一覧 -->
-    <section class="items-container">
-      <h2>アイテム一覧</h2>
-      <ul id="itemList">
-        <!-- ここにアイテムが動的に表示される -->
-      </ul>
-      <p id="emptyMessage" class="empty-message">
-        アイテムがありません。上のフォームから追加してください。
-      </p>
-    </section>
-  </div>
+      <!-- 検索フォーム -->
+      <section class="search-container">
+        <button id="searchButton" class="search-toggle-button">検索</button>
+        <div id="searchForm" class="search-form hidden">
+          <input
+            type="text"
+            id="searchInput"
+            placeholder="検索したい文字列を入力..."
+            autocomplete="off"
+          />
+          <button id="searchStartButton">検索開始</button>
+        </div>
+      </section>
 
-  <!-- クライアント側JavaScript（別ファイル） -->
-  <script src="app.js"></script>
-</body>
+      <!-- アイテム一覧 -->
+      <section class="items-container">
+        <h2>アイテム一覧</h2>
+        <ul id="itemList">
+          <!-- ここにアイテムが動的に表示される -->
+        </ul>
+        <p id="emptyMessage" class="empty-message">
+          データがありません。上のフォームから追加してください。
+        </p>
+      </section>
+    </div>
+
+    <!-- クライアント側JavaScript（別ファイル） -->
+    <script src="app.js"></script>
+  </body>
 </html>
diff --git a/team_product/src/public/style.css b/team_product/src/public/style.css
index 203a4e8..6a677b0 100644
--- a/team_product/src/public/style.css
+++ b/team_product/src/public/style.css
@@ -78,6 +78,65 @@ header .subtitle {
   background-color: #2980b9;
 }
 
+/* 検索 */
+.search-container {
+  margin-bottom: 20px;
+}
+
+.search-toggle-button {
+  padding: 10px 20px;
+  font-size: 0.95rem;
+  background-color: #7f8c8d;
+  color: white;
+  border: none;
+  border-radius: 8px;
+  cursor: pointer;
+  transition: background-color 0.2s;
+}
+
+.search-toggle-button:hover {
+  background-color: #6c7a7d;
+}
+
+.search-form {
+  display: flex;
+  gap: 10px;
+  margin-top: 12px;
+}
+
+.search-form input {
+  flex: 1;
+  padding: 10px 12px;
+  font-size: 0.95rem;
+  border: 2px solid #ddd;
+  border-radius: 8px;
+  outline: none;
+  transition: border-color 0.2s;
+}
+
+.search-form input:focus {
+  border-color: #f39c12;
+}
+
+.search-form button {
+  padding: 10px 18px;
+  font-size: 0.9rem;
+  background-color: #f39c12;
+  color: white;
+  border: none;
+  border-radius: 8px;
+  cursor: pointer;
+  transition: background-color 0.2s;
+}
+
+.search-form button:hover {
+  background-color: #d68910;
+}
+
+.hidden {
+  display: none;
+}
+
 /* アイテム一覧 */
 .items-container h2 {
   font-size: 1.2rem;
@@ -110,6 +169,83 @@ header .subtitle {
 .item-title {
   font-size: 1rem;
   color: #2c3e50;
+  flex: 1;
+}
+
+.highlight-marker {
+  background-color: #fff1b8;
+  padding: 0 2px;
+  border-radius: 3px;
+}
+
+.item-actions {
+  display: flex;
+  gap: 8px;
+}
+
+.item-button {
+  padding: 8px 12px;
+  border: none;
+  border-radius: 6px;
+  color: white;
+  cursor: pointer;
+  font-size: 0.85rem;
+}
+
+.edit-button {
+  background-color: #7f8c8d;
+}
+
+.edit-button:hover {
+  background-color: #6c7a7d;
+}
+
+.done-button {
+  background-color: #27ae60;
+}
+
+.done-button:hover {
+  background-color: #219150;
+}
+
+.delete-button {
+  background-color: #e74c3c;
+}
+
+.delete-button:hover {
+  background-color: #c0392b;
+}
+
+.edit-input {
+  flex: 1;
+  padding: 8px 10px;
+  border: 2px solid #ddd;
+  border-radius: 6px;
+  font-size: 1rem;
+}
+
+.edit-input:focus {
+  outline: none;
+  border-color: #3498db;
+}
+
+/* 完了アイテム */
+.item-completed {
+  background-color: #f0f0f0;
+  opacity: 0.7;
+}
+
+.item-completed .item-title {
+  color: #95a5a6;
+  text-decoration: line-through;
+}
+
+.item-checkbox {
+  width: 18px;
+  height: 18px;
+  margin-right: 10px;
+  cursor: pointer;
+  accent-color: #27ae60;
 }
 
 /* 空メッセージ */
@@ -122,6 +258,54 @@ header .subtitle {
   display: none;
 }
 
+/* 削除確認ダイアログ */
+.confirm-overlay {
+  position: fixed;
+  inset: 0;
+  background-color: rgba(0, 0, 0, 0.45);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 20px;
+  z-index: 1000;
+}
+
+.confirm-dialog {
+  width: 100%;
+  max-width: 360px;
+  background-color: #fff;
+  border-radius: 10px;
+  padding: 20px;
+  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
+}
+
+.confirm-message {
+  color: #2c3e50;
+  margin-bottom: 18px;
+}
+
+.confirm-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 8px;
+}
+
+.confirm-yes-button {
+  background-color: #e74c3c;
+}
+
+.confirm-yes-button:hover {
+  background-color: #c0392b;
+}
+
+.confirm-no-button {
+  background-color: #7f8c8d;
+}
+
+.confirm-no-button:hover {
+  background-color: #6c7a7d;
+}
+
 /* レスポンシブ */
 @media (max-width: 480px) {
   .add-form {
@@ -131,4 +315,12 @@ header .subtitle {
   .add-form button {
     width: 100%;
   }
+
+  .search-form {
+    flex-direction: column;
+  }
+
+  .search-form button {
+    width: 100%;
+  }
 }
diff --git a/team_product/src/server.js b/team_product/src/server.js
index f9d2a84..f59fed5 100644
--- a/team_product/src/server.js
+++ b/team_product/src/server.js
@@ -4,22 +4,22 @@
  * このファイルはサーバー側の処理を担当します。
  * ログはVSCodeのターミナルに表示されます。
  *
- * 現在の機能: Create（追加）、Read（一覧表示）
+ * 現在の機能: Create（追加）、Read（一覧表示）、Search（検索）、Update（編集）、Complete（完了）、Delete（削除）
  */
 
-const express = require('express')
-const { PrismaClient } = require('@prisma/client')
-const path = require('path')
+const express = require("express");
+const { PrismaClient } = require("@prisma/client");
+const path = require("path");
 
-const app = express()
-const prisma = new PrismaClient()
-const PORT = 3000
+const app = express();
+const prisma = new PrismaClient();
+const PORT = 3000;
 
 // ミドルウェア設定
 // JSONデータを受け取れるようにする
-app.use(express.json())
+app.use(express.json());
 // 静的ファイル（HTML、CSS、JS）を提供
-app.use(express.static(path.join(__dirname, 'public')))
+app.use(express.static(path.join(__dirname, "public")));
 
 // =====================================================
 // API エンドポイント（ここがServer層の処理）
@@ -33,20 +33,53 @@ app.use(express.static(path.join(__dirname, 'public')))
  * - Process: DBからアイテムを全件取得
  * - Output: アイテム一覧をJSONで返す
  */
-app.get('/api/items', async (req, res) => {
+app.get("/api/items", async (req, res) => {
   try {
     // DBからアイテムを取得（新しい順）
     const items = await prisma.item.findMany({
-      orderBy: { createdAt: 'desc' }
-    })
+      orderBy: { createdAt: "desc" },
+    });
 
-    console.log('[SERVER] アイテム一覧を取得:', items.length, '件')
-    res.json(items)
+    console.log("[SERVER] アイテム一覧を取得:", items.length, "件");
+    res.json(items);
   } catch (error) {
-    console.error('[SERVER] エラー:', error)
-    res.status(500).json({ error: 'アイテム取得に失敗しました' })
+    console.error("[SERVER] エラー:", error);
+    res.status(500).json({ error: "アイテム取得に失敗しました" });
   }
-})
+});
+
+/**
+ * GET /api/items/search - アイテム検索
+ *
+ * IPO:
+ * - Input: クライアントから検索文字列（keyword）を受け取る
+ * - Process: DBでtitleがkeywordを部分一致するデータを検索
+ * - Output: 該当するアイテム一覧をJSONで返す
+ */
+app.get("/api/items/search", async (req, res) => {
+  try {
+    const keyword = String(req.query.keyword ?? "").trim();
+
+    if (!keyword) {
+      return res.status(400).json({ error: "検索文字列を入力してください" });
+    }
+
+    const items = await prisma.item.findMany({
+      where: {
+        title: {
+          contains: keyword,
+        },
+      },
+      orderBy: { createdAt: "desc" },
+    });
+
+    console.log("[SERVER] アイテムを検索:", keyword, items.length, "件");
+    res.json(items);
+  } catch (error) {
+    console.error("[SERVER] エラー:", error);
+    res.status(500).json({ error: "検索に失敗しました" });
+  }
+});
 
 /**
  * POST /api/items - アイテム作成
@@ -56,38 +89,136 @@ app.get('/api/items', async (req, res) => {
  * - Process: DBに新しいアイテムを保存
  * - Output: 作成したアイテムをJSONで返す
  */
-app.post('/api/items', async (req, res) => {
+app.post("/api/items", async (req, res) => {
   try {
-    const { title } = req.body
+    const { title } = req.body;
 
     // バリデーション（入力チェック）
-    if (!title || title.trim() === '') {
-      return res.status(400).json({ error: 'タイトルを入力してください' })
+    if (!title || title.trim() === "") {
+      return res.status(400).json({ error: "タイトルを入力してください" });
     }
 
     // DBにアイテムを保存（永続化！）
     const item = await prisma.item.create({
-      data: { title: title.trim() }
+      data: { title: title.trim() },
+    });
+
+    console.log("[SERVER] アイテムを作成:", item);
+    res.status(201).json(item);
+  } catch (error) {
+    console.error("[SERVER] エラー:", error);
+    res.status(500).json({ error: "アイテム作成に失敗しました" });
+  }
+});
+
+/**
+ * PUT /api/items/:id - アイテム編集
+ *
+ * IPO:
+ * - Input: クライアントからidとnameを受け取る
+ * - Process: 対象idのtitleをDB上で更新
+ * - Output: 更新したアイテムをJSONで返す
+ */
+app.put("/api/items/:id", async (req, res) => {
+  try {
+    const id = Number(req.params.id);
+    const { name, title } = req.body;
+    const nextName = (name ?? title ?? "").trim();
+
+    if (!Number.isInteger(id) || id <= 0) {
+      return res.status(400).json({ error: "不正なidです" });
+    }
+
+    if (!nextName) {
+      return res.status(400).json({ error: "nameを入力してください" });
+    }
+
+    const item = await prisma.item.update({
+      where: { id },
+      data: { title: nextName },
+    });
+
+    console.log("[SERVER] アイテムを更新:", item);
+    res.json(item);
+  } catch (error) {
+    console.error("[SERVER] エラー:", error);
+    res.status(500).json({ error: "アイテム更新に失敗しました" });
+  }
+});
+
+/**
+ * DELETE /api/items/:id - アイテム削除
+ *
+ * IPO:
+ * - Input: クライアントからidを受け取る
+ * - Process: 対象idのデータをDB上から削除
+ * - Output: 削除したアイテムをJSONで返す
+ */
+app.delete("/api/items/:id", async (req, res) => {
+  try {
+    const id = Number(req.params.id);
+
+    if (!Number.isInteger(id) || id <= 0) {
+      return res.status(400).json({ error: "不正なidです" });
+    }
+
+    const item = await prisma.item.delete({
+      where: { id },
+    });
+
+    console.log("[SERVER] アイテムを削除:", item);
+    res.json(item);
+  } catch (error) {
+    console.error("[SERVER] エラー:", error);
+
+    if (error.code === "P2025") {
+      return res.status(404).json({ error: "対象データが見つかりません" });
+    }
+
+    res.status(500).json({ error: "アイテム削除に失敗しました" });
+  }
+});
+
+/**
+ * PATCH /api/items/:id/complete - アイテム完了
+ *
+ * IPO:
+ * - Input: URLパラメータからアイテムIDを受け取る
+ * - Process: 対象idのcompletedをDB上でトグル（true/false）
+ * - Output: 更新したアイテムをJSONで返す
+ */
+app.patch('/api/items/:id/complete', async (req, res) => {
+  try {
+    const id = Number(req.params.id)
+
+    if (!Number.isInteger(id) || id <= 0) {
+      return res.status(400).json({ error: '不正なidです' })
+    }
+
+    // 現在のcompletedを取得してトグル
+    const current = await prisma.item.findUnique({ where: { id } })
+    if (!current) {
+      return res.status(404).json({ error: 'アイテムが見つかりません' })
+    }
+
+    const item = await prisma.item.update({
+      where: { id },
+      data: { completed: !current.completed }
     })
 
-    console.log('[SERVER] アイテムを作成:', item)
-    res.status(201).json(item)
+    console.log('[SERVER] アイテムを完了切替:', item)
+    res.json(item)
   } catch (error) {
     console.error('[SERVER] エラー:', error)
-    res.status(500).json({ error: 'アイテム作成に失敗しました' })
+    res.status(500).json({ error: 'アイテム完了に失敗しました' })
   }
 })
-
-// =====================================================
-// ここに新しいAPI（Delete, Updateなど）を追加していこう！
-// =====================================================
-
 // =====================================================
 // サーバー起動
 // =====================================================
 app.listen(PORT, () => {
-  console.log('='.repeat(50))
-  console.log('[SERVER] Base App 起動中')
-  console.log(`[SERVER] URL: http://localhost:${PORT}`)
-  console.log('='.repeat(50))
-})
+  console.log("=".repeat(50));
+  console.log("[SERVER] Base App 起動中");
+  console.log(`[SERVER] URL: http://localhost:${PORT}`);
+  console.log("=".repeat(50));
+});