diff --git a/package-lock.json b/package-lock.json
index b6ef116..5282a14 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,11 @@
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         "dotenv": "^16.0.3",
         "express": "^4.18.2",
-        "firebase-admin": "^11.7.0"
+        "express-async-errors": "^3.1.1",
+        "firebase-admin": "^11.7.0",
+        "pino": "^8.14.1",
+        "pino-pretty": "^10.0.1",
+        "uuid": "^9.0.0"
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@@ -686,7 +690,6 @@
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@@ -821,11 +824,18 @@
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/atomic-sleep/-/atomic-sleep-1.0.0.tgz",
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@@ -844,8 +854,7 @@
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         }
-      ],
-      "optional": true
+      ]
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     "node_modules/bignumber.js": {
       "version": "9.1.1",
@@ -929,6 +938,29 @@
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+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
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+        "ieee754": "^1.2.1"
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+    "node_modules/colorette": {
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+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-2.0.20.tgz",
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@@ -1146,6 +1183,14 @@
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+      "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-4.6.3.tgz",
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+      }
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@@ -1276,7 +1321,6 @@
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@@ -1573,11 +1617,18 @@
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-      "optional": true,
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+    "node_modules/events": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/events/-/events-3.3.0.tgz",
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+      }
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       "resolved": "https://registry.npmjs.org/express/-/express-4.18.2.tgz",
@@ -1619,6 +1670,14 @@
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+    "node_modules/express-async-errors": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/express-async-errors/-/express-async-errors-3.1.1.tgz",
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+      "peerDependencies": {
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+      }
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+    "node_modules/fast-copy": {
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+      "resolved": "https://registry.npmjs.org/fast-copy/-/fast-copy-3.0.1.tgz",
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+    },
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@@ -1655,6 +1719,19 @@
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+    "node_modules/fast-redact": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/fast-redact/-/fast-redact-3.2.0.tgz",
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+      "engines": {
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+      }
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+    "node_modules/fast-safe-stringify": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/fast-safe-stringify/-/fast-safe-stringify-2.1.1.tgz",
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@@ -1827,8 +1904,7 @@
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-      "devOptional": true
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@@ -2074,6 +2150,52 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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+    "node_modules/help-me": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/help-me/-/help-me-4.2.0.tgz",
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+      "dependencies": {
+        "glob": "^8.0.0",
+        "readable-stream": "^3.6.0"
+      }
+    },
+    "node_modules/help-me/node_modules/brace-expansion": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
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+      "resolved": "https://registry.npmjs.org/glob/-/glob-8.1.0.tgz",
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+      "dependencies": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^5.0.1",
+        "once": "^1.3.0"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/help-me/node_modules/minimatch": {
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.6.tgz",
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+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=10"
+      }
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@@ -2306,6 +2427,14 @@
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       }
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+    "node_modules/joycon": {
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+      "resolved": "https://registry.npmjs.org/joycon/-/joycon-3.1.1.tgz",
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+      "engines": {
+        "node": ">=10"
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@@ -2711,7 +2840,6 @@
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-      "optional": true,
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       }
@@ -2882,6 +3010,11 @@
         "url": "https://github.com/sponsors/ljharb"
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+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/on-exit-leak-free/-/on-exit-leak-free-2.1.0.tgz",
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@@ -2897,7 +3030,6 @@
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@@ -3025,6 +3157,95 @@
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       }
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+      "version": "8.14.1",
+      "resolved": "https://registry.npmjs.org/pino/-/pino-8.14.1.tgz",
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+        "fast-redact": "^3.1.1",
+        "on-exit-leak-free": "^2.1.0",
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+        "pino-std-serializers": "^6.0.0",
+        "process-warning": "^2.0.0",
+        "quick-format-unescaped": "^4.0.3",
+        "real-require": "^0.2.0",
+        "safe-stable-stringify": "^2.3.1",
+        "sonic-boom": "^3.1.0",
+        "thread-stream": "^2.0.0"
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+      "bin": {
+        "pino": "bin.js"
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+    "node_modules/pino-abstract-transport": {
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+      "resolved": "https://registry.npmjs.org/pino-abstract-transport/-/pino-abstract-transport-1.0.0.tgz",
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+        "dateformat": "^4.6.3",
+        "fast-copy": "^3.0.0",
+        "fast-safe-stringify": "^2.1.1",
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+        "joycon": "^3.1.1",
+        "minimist": "^1.2.6",
+        "on-exit-leak-free": "^2.1.0",
+        "pino-abstract-transport": "^1.0.0",
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+        "buffer": "^6.0.3",
+        "events": "^3.3.0",
+        "process": "^0.11.10",
+        "string_decoder": "^1.3.0"
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+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
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+    "node_modules/pino-std-serializers": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/pino-std-serializers/-/pino-std-serializers-6.2.2.tgz",
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@@ -3049,6 +3270,19 @@
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+      "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
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+    "node_modules/process-warning": {
+      "version": "2.2.0",
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@@ -3197,6 +3431,15 @@
       "integrity": "sha512-77DZwxQmxKnu3aR542U+X8FypNzbfJ+C5XQDk3uWjWxn6151aIMGthWYRXTqT1E5oJvg+ljaa2OJi+VfvCOQ8w==",
       "dev": true
     },
+    "node_modules/pump": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
+      "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
+      "dependencies": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
+    },
     "node_modules/punycode": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.0.tgz",
@@ -3240,6 +3483,11 @@
         }
       ]
     },
+    "node_modules/quick-format-unescaped": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/quick-format-unescaped/-/quick-format-unescaped-4.0.4.tgz",
+      "integrity": "sha512-tYC1Q1hgyRuHgloV/YXs2w15unPVh8qfu/qCTfhTYamaw7fyhumKa2yGpdSo87vY32rIclj+4fWYQXUMs9EHvg=="
+    },
     "node_modules/range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -3302,6 +3550,14 @@
         "node": ">=8.10.0"
       }
     },
+    "node_modules/real-require": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/real-require/-/real-require-0.2.0.tgz",
+      "integrity": "sha512-57frrGM/OCTLqLOAh0mhVA9VBMHd+9U7Zb2THMGdBUoZVOtGbJzjxsYGDJ3A9AYYCP4hn6y1TVbaOfzWtm5GFg==",
+      "engines": {
+        "node": ">= 12.13.0"
+      }
+    },
     "node_modules/require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -3418,11 +3674,24 @@
         }
       ]
     },
+    "node_modules/safe-stable-stringify": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/safe-stable-stringify/-/safe-stable-stringify-2.4.3.tgz",
+      "integrity": "sha512-e2bDA2WJT0wxseVd4lsDP4+3ONX6HpMXQa1ZhFQ7SU+GjvORCmShbCMltrtIDfkYhVHrOcPtj+KhmDBdPdZD1g==",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
+    "node_modules/secure-json-parse": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/secure-json-parse/-/secure-json-parse-2.7.0.tgz",
+      "integrity": "sha512-6aU+Rwsezw7VR8/nyvKTx8QpWH9FrcYiXXlqC4z5d5XQBDRqtbfsRjnwGyqbi3gddNtWHuEk9OANUotL26qKUw=="
+    },
     "node_modules/semver": {
       "version": "5.7.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
@@ -3558,6 +3827,14 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/sonic-boom": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/sonic-boom/-/sonic-boom-3.3.0.tgz",
+      "integrity": "sha512-LYxp34KlZ1a2Jb8ZQgFCK3niIHzibdwtwNUWKg0qQRzsDoJ3Gfgkf8KdBTFU3SkejDEIlWwnSnpVdOZIhFMl/g==",
+      "dependencies": {
+        "atomic-sleep": "^1.0.0"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -3567,6 +3844,14 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/split2": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/split2/-/split2-4.2.0.tgz",
+      "integrity": "sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==",
+      "engines": {
+        "node": ">= 10.x"
+      }
+    },
     "node_modules/statuses": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
@@ -3636,7 +3921,6 @@
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
       "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
-      "devOptional": true,
       "engines": {
         "node": ">=8"
       },
@@ -3705,6 +3989,14 @@
       "integrity": "sha512-N+8UisAXDGk8PFXP4HAzVR9nbfmVJ3zYLAWiTIoqC5v5isinhr+r5uaO8+7r3BMfuNIufIsA7RdpVgacC2cSpw==",
       "dev": true
     },
+    "node_modules/thread-stream": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-2.3.0.tgz",
+      "integrity": "sha512-kaDqm1DET9pp3NXwR8382WHbnpXnRkN9xGN9dQt3B2+dmXiW8X1SOwmFOxAErEQ47ObhZ96J6yhZNXuyCOL7KA==",
+      "dependencies": {
+        "real-require": "^0.2.0"
+      }
+    },
     "node_modules/tmp": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.1.tgz",
@@ -3985,8 +4277,7 @@
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
-      "devOptional": true
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
     },
     "node_modules/ws": {
       "version": "8.13.0",
diff --git a/package.json b/package.json
index 4fc45c2..64d6c12 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,10 @@
     "discord.js": "^14.9.0",
     "dotenv": "^16.0.3",
     "express": "^4.18.2",
-    "firebase-admin": "^11.7.0"
+    "express-async-errors": "^3.1.1",
+    "firebase-admin": "^11.7.0",
+    "pino": "^8.14.1",
+    "pino-pretty": "^10.0.1",
+    "uuid": "^9.0.0"
   }
-}
\ No newline at end of file
+}
diff --git a/src/apiServer/apiServer.js b/src/apiServer/apiServer.js
new file mode 100644
index 0000000..67f4455
--- /dev/null
+++ b/src/apiServer/apiServer.js
@@ -0,0 +1,37 @@
+const app = require('./express');
+const http = require('http');
+
+const logger = require('../lib/logger.js');
+
+class ApiServer {
+  constructor(port) {
+    logger.info('Configure API Server ...', { port, node_env: process.env.NODE_ENV });
+
+    this.port = port;
+    this.httpServer = null;
+    this.db = null;
+
+    this.#createServer();
+    this.#bindEvents();
+  }
+
+  #createServer() {
+    this.httpServer = http.createServer(app);
+  }
+
+  #bindEvents() {
+    logger.info('Binding Events ...');
+    this.httpServer.on('listening', () => {
+      logger.info(`Server started on port: ${this.port} for NODE_ENV:${process.env.NODE_ENV}`);
+    });
+    this.httpServer.on('error', (err) => {
+      logger.error('Server error:', err);
+    });
+  }
+
+  start() {
+    this.httpServer.listen(this.port);
+  }
+}
+
+module.exports = ApiServer;
\ No newline at end of file
diff --git a/src/apiServer/express.js b/src/apiServer/express.js
new file mode 100644
index 0000000..fb8c9e1
--- /dev/null
+++ b/src/apiServer/express.js
@@ -0,0 +1,33 @@
+const express = require('express');
+require('express-async-errors'); // for catching async error
+const cors = require('cors');
+const router = require('./routes/index.js');
+const errorHandler = require('./middlewares/errorHandler.js');
+const resMethod = require('./middlewares/resMethod.js');
+const reqInitializer = require('./middlewares/reqInitializer.js');
+
+const app = express();
+
+app.use(cors({
+  exposedHeaders: ['X-Request-Id'],
+}));
+
+
+app.use(reqInitializer);
+app.use(resMethod);
+app.use('/api', router);
+
+app.use(errorHandler);
+
+// 404 handler
+app.use('*', (req, res) => res.status(404).send({
+  success: false,
+  message: '指定路徑並不存在',
+  error: {
+    code: 404,
+    type: 'RouteNotFound',
+    debugInfo: {},
+  },
+}));
+
+module.exports = app;
\ No newline at end of file
diff --git a/src/apiServer/middlewares/errorHandler.js b/src/apiServer/middlewares/errorHandler.js
new file mode 100644
index 0000000..f7f4d8d
--- /dev/null
+++ b/src/apiServer/middlewares/errorHandler.js
@@ -0,0 +1,26 @@
+const logger = require('../../lib/logger.js');
+const Errors = require('../../lib/Errors.js');
+
+/**
+ * @type {import('express').ErrorRequestHandler}
+ */
+module.exports = function errorHandler(err, req, res, next) {
+  const errorMessage = err.msg || err.message;
+  const data = {};
+  if (process.env.NODE_ENV === 'dev') {
+    data.stack = err.stack;
+    console.log(err);
+  }
+
+  logger.info(`General error handler for error: ${errorMessage}`, data);
+  if (res.headersSent) {
+    return next(err);
+  } else if (err instanceof Errors.GeneralError) {
+    return res.fail(err);
+  }
+
+  // 當錯誤並非預定義時
+  logger.error({ msg: 'Exception', errMsg: err.message, errName: err.name });
+  res.status(501);
+  return res.send(err.message);
+};
\ No newline at end of file
diff --git a/src/apiServer/middlewares/reqInitializer.js b/src/apiServer/middlewares/reqInitializer.js
new file mode 100644
index 0000000..4d1bd9c
--- /dev/null
+++ b/src/apiServer/middlewares/reqInitializer.js
@@ -0,0 +1,31 @@
+const { v4: uuidv4 } = require('uuid');
+const logger = require('../../lib/logger');
+
+/**
+ * @type {import('express').Handler}
+ */
+module.exports = function reqInitializer(req, res, next) {
+  const start = process.hrtime.bigint();
+  req.requestId = uuidv4();
+
+  const { method, query = {}, body = {}, requestId, originalUrl } = req;
+  logger.debug({ msg: `${method} ${originalUrl} [STARTED]`, requestId, query, body });
+
+  res.on('finish', () => {
+    const durationInMilliseconds = getDurationInMilliseconds(start);
+    logger.info({ msg: `${method} ${originalUrl} [FINISHED] ${durationInMilliseconds.toLocaleString()} ms`, requestId });
+  });
+
+  res.on('close', () => {
+    const durationInMilliseconds = getDurationInMilliseconds(start);
+    logger.info({ msg: `${method} ${originalUrl} [CLOSED] ${durationInMilliseconds.toLocaleString()} ms`, requestId });
+  });
+
+  res.setHeader('X-Request-Id', req.requestId);
+  next();
+};
+
+function getDurationInMilliseconds(start) {
+  const diff = process.hrtime.bigint() - start;
+  return Number(diff) / 1000000;
+}
\ No newline at end of file
diff --git a/src/apiServer/middlewares/resMethod.js b/src/apiServer/middlewares/resMethod.js
new file mode 100644
index 0000000..1bf467c
--- /dev/null
+++ b/src/apiServer/middlewares/resMethod.js
@@ -0,0 +1,29 @@
+/**
+ * @type {import('express').Handler}
+ */
+module.exports = function resMethod(req, res, next) {
+  res.success = function success({ data, ...info }) {
+    res.status(200).send({
+      success: true,
+      data,
+      ...info,
+    });
+  };
+
+  /**
+   * @param {Error} error 
+   */
+  res.fail = function fail(error) {
+    res.status(error.code).send({
+      success: false,
+      message: error.message,
+      error: {
+        code: error.code,
+        type: error.name,
+        debugInfo: error.data,
+      }
+    });
+  };
+
+  next();
+};
\ No newline at end of file
diff --git a/src/apiServer/routes/index.js b/src/apiServer/routes/index.js
new file mode 100644
index 0000000..de2b59c
--- /dev/null
+++ b/src/apiServer/routes/index.js
@@ -0,0 +1,10 @@
+const express = require('express');
+const router = express.Router();
+
+router.use('/leaderboard', require('./leaderboard.js'));
+router.get('/healthCheck', (req, res) => {
+  return res.success({ data: 'ok' });
+});
+
+
+module.exports = router;
\ No newline at end of file
diff --git a/src/apiServer/routes/leaderboard.js b/src/apiServer/routes/leaderboard.js
new file mode 100644
index 0000000..4fd549d
--- /dev/null
+++ b/src/apiServer/routes/leaderboard.js
@@ -0,0 +1,81 @@
+const express = require('express');
+const router = express.Router();
+const Discord = require('discord.js');
+
+const { db } = require('../../config/db');
+const { pageSize } = require('../../const.js');
+
+function validate(req, res, next) {
+  const { date, discordId, page } = req.query;
+  if (page && typeof Number(page) && Number(page) <= 0) {
+    return res.status(400).json('page must be valid number');
+  }
+
+  const dateRegex = /([12]\d{3}-(0[1-9]|1[0-2]))/;
+  if (date && !dateRegex.test(date)) {
+    return res.status(400).json('date must be in YYYY-MM format');
+  }
+
+  if (discordId && typeof discordId !== 'string') {
+    return res.status(400).json('discordId must be string');
+  }
+
+  next();
+}
+
+
+
+router.get('/', validate, async function (req, res) {
+  const currentYearAndMonth = new Date().toISOString().slice(0, 7);
+  const { date, discordId, page = 1 } = req.query;
+  let ref = db
+    .collection(`leaderboard-${currentYearAndMonth}`)
+    .where('period', '=', date || currentYearAndMonth);
+
+  const countSnapshot = await ref.count().get();
+  const totalDocsCount = countSnapshot.data().count;
+  const totalPages = Math.ceil(totalDocsCount / 10);
+  const offset = (page - 1) * pageSize;
+
+  if (discordId) {
+    ref = ref.where('discordId', '=', discordId);
+  }
+
+  const querySnapshot = await ref
+    .orderBy('point', 'desc')
+    .limit(pageSize)
+    .offset(offset)
+    .get();
+
+  const client = new Discord.Client({
+    intents: []
+  });
+  client.login(process.env.DISCORD_TOKEN);
+
+  const fetchUserDetails = async (doc) => {
+    const data = doc.data();
+    const guild = await client.guilds.fetch(process.env.DISCORD_GUILDID);
+    const member = await guild.members.fetch(data.discordId);
+
+    return {
+      id: doc.id,
+      name: member.nickname || member.user.username,
+      avatarURL: member.user.displayAvatarURL(),
+      ...data
+    };
+  };
+
+  const promises = querySnapshot.docs.map(fetchUserDetails);
+  const results = await Promise.all(promises);
+
+  return res.success({
+    data: results,
+    offset,
+    pageSize,
+    totalPages,
+    currentPage: page,
+    totalDataCount: totalDocsCount
+  });
+});
+
+module.exports = router;
diff --git a/src/app.js b/src/app.js
index 2e9ced2..0b21998 100644
--- a/src/app.js
+++ b/src/app.js
@@ -1,8 +1,5 @@
 // Require the necessary discord.js classes
 require('dotenv').config();
-const express = require('express');
-var cors = require('cors');
-const app = express();
 const { readdirSync } = require('node:fs');
 const { join } = require('node:path');
 const {
@@ -15,6 +12,8 @@ const {
 } = require('discord.js');
 const { db } = require('./config/db.js');
 const { FieldValue } = require('firebase-admin/firestore');
+const logger = require('./lib/logger.js');
+
 const fs = require('fs');
 const path = require('path');
 const client = new Client({
@@ -53,7 +52,7 @@ for (const file of commandFiles) {
   if ('data' in command && 'execute' in command) {
     client.commands.set(command.data.name, command);
   } else {
-    console.log(
+    logger.info(
       `[WARNING] The command at ${filePath} is missing a required "data" or "execute" property.`
     );
   }
@@ -66,7 +65,7 @@ client.on(Events.MessageReactionAdd, async (reaction, user) => {
     try {
       await reaction.fetch();
     } catch (error) {
-      console.error('Something went wrong when fetching the message:', error);
+      logger.error('Something went wrong when fetching the message:', error);
       // Return as `reaction.message.author` may be undefined/null
       return;
     }
@@ -139,10 +138,10 @@ client.on(Events.MessageReactionRemove, async (reaction, user) => {
 // Log in to Discord with your client's token
 client.login(process.env.DISCORD_TOKEN);
 
-const apiRoutes = require('./routes/index');
-
-app.use('/api', cors(), apiRoutes);
 
-app.listen(process.env.PORT || 3306, () => {
-  console.log(`server is running on ${process.env.PORT || 3306}`);
-});
+/**
+ * API Server Execution
+ */
+const ApiServer = require('./apiServer/apiServer.js');
+const server = new ApiServer(process.env.PORT || 3306);
+server.start();
\ No newline at end of file
diff --git a/src/commands/leaderboard/rank.js b/src/commands/leaderboard/rank.js
index 2b721ad..a5ffc1f 100644
--- a/src/commands/leaderboard/rank.js
+++ b/src/commands/leaderboard/rank.js
@@ -1,6 +1,8 @@
 require('dotenv').config();
 const { SlashCommandBuilder } = require('discord.js');
 const { db } = require('../../config/db.js');
+const logger = require('../../lib/logger.js');
+
 module.exports = {
   data: new SlashCommandBuilder()
     .setName('rank')
@@ -46,6 +48,6 @@ async function queryUserRankAndPoint(discordId) {
 
     return { userRank, userPoint };
   } catch (error) {
-    console.error('查詢用戶排名時發生錯誤：', error);
+    logger.error('查詢用戶排名時發生錯誤：', error);
   }
 }
diff --git a/src/deploy-commands.js b/src/deploy-commands.js
index dce896d..aea1a77 100644
--- a/src/deploy-commands.js
+++ b/src/deploy-commands.js
@@ -2,6 +2,8 @@ const { REST, Routes } = require('discord.js');
 const fs = require('node:fs');
 const path = require('node:path');
 
+const logger = require('./lib/logger.js');
+
 const commands = [];
 // Grab all the command files from the commands directory you created earlier
 const foldersPath = path.join(__dirname, 'commands');
@@ -20,7 +22,7 @@ for (const folder of commandFolders) {
     if ('data' in command && 'execute' in command) {
       commands.push(command.data.toJSON());
     } else {
-      console.log(
+      logger.info(
         `[WARNING] The command at ${filePath} is missing a required "data" or "execute" property.`
       );
     }
@@ -33,7 +35,7 @@ const rest = new REST().setToken(process.env.DISCORD_TOKEN);
 // and deploy your commands!
 (async () => {
   try {
-    console.log(
+    logger.info(
       `Started refreshing ${commands.length} application (/) commands.`
     );
 
@@ -46,11 +48,11 @@ const rest = new REST().setToken(process.env.DISCORD_TOKEN);
       { body: commands }
     );
 
-    console.log(
+    logger.info(
       `Successfully reloaded ${data.length} application (/) commands.`
     );
   } catch (error) {
     // And of course, make sure you catch and log any errors!
-    console.error(error);
+    logger.error(error);
   }
 })();
diff --git a/src/events/interactionCreate.js b/src/events/interactionCreate.js
index 5465c1c..40d1ff4 100644
--- a/src/events/interactionCreate.js
+++ b/src/events/interactionCreate.js
@@ -1,4 +1,5 @@
 const { Events } = require('discord.js');
+const logger = require('../lib/logger.js');
 
 module.exports = {
   name: Events.InteractionCreate,
@@ -8,7 +9,7 @@ module.exports = {
     const command = interaction.client.commands.get(interaction.commandName);
 
     if (!command) {
-      console.error(
+      logger.error(
         `No command matching ${interaction.commandName} was found.`
       );
       return;
@@ -17,8 +18,8 @@ module.exports = {
     try {
       await command.execute(interaction);
     } catch (error) {
-      console.error(`Error executing ${interaction.commandName}`);
-      console.error(error);
+      logger.error(`Error executing ${interaction.commandName}`);
+      logger.error(error);
     }
   }
 };
diff --git a/src/events/ready.js b/src/events/ready.js
index ec9abde..e399ceb 100644
--- a/src/events/ready.js
+++ b/src/events/ready.js
@@ -1,9 +1,10 @@
 const { Events } = require('discord.js');
+const logger = require('../lib/logger.js');
 
 module.exports = {
   name: Events.ClientReady,
   once: true,
   execute(client) {
-    console.log(`Ready! Logged in as ${client.user.tag}`);
+    logger.info(`Ready! Logged in as ${client.user.tag}`);
   }
 };
diff --git a/src/lib/Errors.js b/src/lib/Errors.js
new file mode 100644
index 0000000..e84f50e
--- /dev/null
+++ b/src/lib/Errors.js
@@ -0,0 +1,12 @@
+class GeneralError extends Error {
+  constructor({ msg, data, code }) {
+    super(msg);
+    this.data = data;
+    this.code = code;
+    this.name = this.constructor.name;
+  }
+}
+
+module.exports = {
+  GeneralError,
+};
diff --git a/src/lib/logger.js b/src/lib/logger.js
new file mode 100644
index 0000000..6017dcd
--- /dev/null
+++ b/src/lib/logger.js
@@ -0,0 +1,27 @@
+'use strict';
+const pino = require('pino');
+
+// 為了兼容vscode debugger時也能使用pino-pretty特別做的處理; pino-pretty不建議使用於prod環境
+const pinoParams = [
+  {
+    level: 'trace',
+    timestamp: pino.stdTimeFunctions.isoTime,
+    base: undefined,
+  },
+];
+if (process.env.NODE_ENV === 'dev') {
+  const pretty = require('pino-pretty');
+  const stream = pretty({
+    colorize: true,
+    translateTime: 'SYS:mm-dd HH:MM:ss',
+  });
+
+  pinoParams.push(stream);
+}
+
+/**
+ * pino document: https://github.com/pinojs/pino/blob/HEAD/docs/api.md
+ */
+const Logger = pino(...pinoParams);
+
+module.exports = Logger;
diff --git a/src/routes/index.js b/src/routes/index.js
deleted file mode 100644
index 72eaaae..0000000
--- a/src/routes/index.js
+++ /dev/null
@@ -1,87 +0,0 @@
-const express = require('express');
-const router = express.Router();
-const { db } = require('../config/db');
-const { pageSize } = require('../const.js');
-
-function validate(req, res, next) {
-  const { date, discordId, page } = req.query;
-  if (page && typeof Number(page) && Number(page) <= 0) {
-    return res.status(400).json('page must be valid number');
-  }
-
-  const dateRegex = /([12]\d{3}-(0[1-9]|1[0-2]))/;
-  if (date && !dateRegex.test(date)) {
-    return res.status(400).json('date must be in YYYY-MM format');
-  }
-
-  if (discordId && typeof discordId !== 'string') {
-    return res.status(400).json('discordId must be string');
-  }
-
-  next();
-}
-
-router.get('/healthCheck', (req, res) => {
-  return res.send('ok');
-});
-
-router.get('/leaderboard', validate, async function (req, res) {
-  try {
-    const currentYearAndMonth = new Date().toISOString().slice(0, 7);
-    const { date, discordId, page = 1 } = req.query;
-    let ref = db
-      .collection(`leaderboard-${currentYearAndMonth}`)
-      .where('period', '=', date || currentYearAndMonth);
-
-    const countSnapshot = await ref.count().get();
-    const totalDocsCount = countSnapshot.data().count;
-    const totalPages = Math.ceil(totalDocsCount / 10);
-    const offset = (page - 1) * pageSize;
-
-    if (discordId) {
-      ref = ref.where('discordId', '=', discordId);
-    }
-
-    const querySnapshot = await ref
-      .orderBy('point', 'desc')
-      .limit(pageSize)
-      .offset(offset)
-      .get();
-
-    const Discord = require('discord.js');
-    const client = new Discord.Client({
-      intents: []
-    });
-    client.login(process.env.DISCORD_TOKEN);
-
-    const fetchUserDetails = async (doc) => {
-      const data = doc.data();
-      const guild = await client.guilds.fetch(process.env.DISCORD_GUILDID);
-      const member = await guild.members.fetch(data.discordId);
-
-      return {
-        id: doc.id,
-        name: member.nickname || member.user.username,
-        avatarURL: member.user.displayAvatarURL(),
-        ...data
-      };
-    };
-
-    const promises = querySnapshot.docs.map(fetchUserDetails);
-    const results = await Promise.all(promises);
-
-    return res.status(200).json({
-      data: results,
-      offset,
-      pageSize,
-      totalPages,
-      currentPage: page,
-      totalDataCount: totalDocsCount
-    });
-  } catch (err) {
-    console.error(err);
-    return res.status(500).json(err);
-  }
-});
-
-module.exports = router;
diff --git a/types/express.d.ts b/types/express.d.ts
new file mode 100644
index 0000000..cc202a3
--- /dev/null
+++ b/types/express.d.ts
@@ -0,0 +1,9 @@
+declare namespace Express {
+  interface Request {
+    requestId: string;
+  }
+  interface Response {
+    fail: (error: Error) => void;
+    success: ({ data: object, ...info }) => void;
+  }
+}
\ No newline at end of file
diff --git a/types/global.d.ts b/types/global.d.ts
new file mode 100644
index 0000000..e69de29