diff --git a/custome-middlewares/.gitignore b/custome-middlewares/.gitignore
new file mode 100644
index 00000000..c2658d7d
--- /dev/null
+++ b/custome-middlewares/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/custome-middlewares/dist/custom-middleware/array-validator.js b/custome-middlewares/dist/custom-middleware/array-validator.js
new file mode 100644
index 00000000..3225d8e2
--- /dev/null
+++ b/custome-middlewares/dist/custom-middleware/array-validator.js
@@ -0,0 +1,16 @@
+const arrayValidator = (req, res, next) => {
+    const body = req.body;
+    // 1. Is it a valid array?
+    if (!Array.isArray(body)) {
+        return res.status(400).send("Bad Request: Body must be a JSON array.");
+    }
+    // 2. Are all items inside the array strings?
+    const allStrings = body.every((item) => typeof item === "string");
+    if (!allStrings) {
+        return res
+            .status(400)
+            .send("Bad Request: All array elements must be strings.");
+    }
+    next();
+};
+export default arrayValidator;
diff --git a/custome-middlewares/dist/custom-middleware/username-validator.js b/custome-middlewares/dist/custom-middleware/username-validator.js
new file mode 100644
index 00000000..301fb446
--- /dev/null
+++ b/custome-middlewares/dist/custom-middleware/username-validator.js
@@ -0,0 +1,13 @@
+const usernameLoader = (req, res, next) => {
+    const usernameHeader = req.headers["x-username"];
+    if (typeof usernameHeader === "string") {
+        req.username = usernameHeader;
+    }
+    if (!req.username) {
+        return res
+            .status(401)
+            .send("Unauthorized: You must provide a valid x-username header.");
+    }
+    next();
+};
+export default usernameLoader;
diff --git a/custome-middlewares/dist/main.js b/custome-middlewares/dist/main.js
new file mode 100644
index 00000000..95628379
--- /dev/null
+++ b/custome-middlewares/dist/main.js
@@ -0,0 +1,23 @@
+import express from "express";
+import arrayValidator from "./custom-middleware/array-validator.js";
+import usernameLoader from "./custom-middleware/username-validator.js";
+const app = express();
+const port = 3000;
+app.use(express.json());
+app.post("/", usernameLoader, arrayValidator, (req, res) => {
+    const subjects = req.body;
+    const count = subjects.length;
+    const subjectList = subjects.join(", ");
+    // 1. Format the authentication message using the custom header middleware
+    let authMessage = req.username
+        ? `You are authenticated as ${req.username}.`
+        : "You are not authenticated.";
+    // 2. Format the subject list counts from the array validator middleware
+    let subjectMessage = count === 1
+        ? `You have requested information about 1 subject: ${subjectList}.`
+        : `You have requested information about ${count} subjects${count > 0 ? ": " + subjectList : "."}`;
+    res.send(`${authMessage}\n\n${subjectMessage}`);
+});
+app.listen(port, () => {
+    console.log(`Middleware exercises server running on port ${port}`);
+});
diff --git a/custome-middlewares/package-lock.json b/custome-middlewares/package-lock.json
new file mode 100644
index 00000000..0970d1cf
--- /dev/null
+++ b/custome-middlewares/package-lock.json
@@ -0,0 +1,1346 @@
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+  "name": "custom-middlewares",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
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+    "node_modules/@types/connect": {
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+      "dev": true,
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+      "dependencies": {
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+    "node_modules/@types/express": {
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+      "dev": true,
+      "license": "Apache-2.0",
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+        "tsserver": "bin/tsserver"
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+      "license": "MIT"
+    },
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+      "license": "MIT",
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+      }
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+    "node_modules/utils-merge": {
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+      "license": "MIT",
+      "engines": {
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+      "license": "MIT",
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+        "node": ">= 0.8"
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+  }
+}
diff --git a/custome-middlewares/package.json b/custome-middlewares/package.json
new file mode 100644
index 00000000..01ba9c9a
--- /dev/null
+++ b/custome-middlewares/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "custom-middlewares",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "dist/main.js",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/main.js",
+    "dev": "tsc --watch & nodemon dist/main.js"
+  },
+  "dependencies": {
+    "express": "^4.19.2"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.21",
+    "@types/node": "^20.11.0",
+    "nodemon": "^3.1.0",
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/custome-middlewares/src/custom-middleware/array-validator.ts b/custome-middlewares/src/custom-middleware/array-validator.ts
new file mode 100644
index 00000000..24889894
--- /dev/null
+++ b/custome-middlewares/src/custom-middleware/array-validator.ts
@@ -0,0 +1,23 @@
+// custom-middlewares/src/custom-middleware/array_validator.ts
+import type { Request, Response, NextFunction } from "express";
+
+const arrayValidator = (req: Request, res: Response, next: NextFunction) => {
+  const body = req.body;
+
+  // 1. Is it a valid array?
+  if (!Array.isArray(body)) {
+    return res.status(400).send("Bad Request: Body must be a JSON array.");
+  }
+
+  // 2. Are all items inside the array strings?
+  const allStrings = body.every((item) => typeof item === "string");
+  if (!allStrings) {
+    return res
+      .status(400)
+      .send("Bad Request: All array elements must be strings.");
+  }
+
+  next();
+};
+
+export default arrayValidator;
diff --git a/custome-middlewares/src/custom-middleware/username-validator.ts b/custome-middlewares/src/custom-middleware/username-validator.ts
new file mode 100644
index 00000000..10648e52
--- /dev/null
+++ b/custome-middlewares/src/custom-middleware/username-validator.ts
@@ -0,0 +1,18 @@
+import type { Request, Response, NextFunction } from "express";
+
+const usernameLoader = (req: Request, res: Response, next: NextFunction) => {
+  const usernameHeader = req.headers["x-username"];
+
+  if (typeof usernameHeader === "string") {
+    req.username = usernameHeader;
+  }
+  if (!req.username) {
+    return res
+      .status(401)
+      .send("Unauthorized: You must provide a valid x-username header.");
+  }
+
+  next();
+};
+
+export default usernameLoader;
diff --git a/custome-middlewares/src/main.ts b/custome-middlewares/src/main.ts
new file mode 100644
index 00000000..4f526b0b
--- /dev/null
+++ b/custome-middlewares/src/main.ts
@@ -0,0 +1,31 @@
+import express from "express";
+import arrayValidator from "./custom-middleware/array-validator.js";
+import usernameLoader from "./custom-middleware/username-validator.js";
+
+const app = express();
+const port = 3000;
+
+app.use(express.json());
+
+app.post("/", usernameLoader, arrayValidator, (req, res) => {
+  const subjects: string[] = req.body;
+  const count = subjects.length;
+  const subjectList = subjects.join(", ");
+
+  // 1. Format the authentication message using the custom header middleware
+  let authMessage = req.username
+    ? `You are authenticated as ${req.username}.`
+    : "You are not authenticated.";
+
+  // 2. Format the subject list counts from the array validator middleware
+  let subjectMessage =
+    count === 1
+      ? `You have requested information about 1 subject: ${subjectList}.`
+      : `You have requested information about ${count} subjects${count > 0 ? ": " + subjectList : "."}`;
+
+  res.send(`${authMessage}\n\n${subjectMessage}`);
+});
+
+app.listen(port, () => {
+  console.log(`Middleware exercises server running on port ${port}`);
+});
diff --git a/custome-middlewares/src/types/express.d.ts b/custome-middlewares/src/types/express.d.ts
new file mode 100644
index 00000000..097aff52
--- /dev/null
+++ b/custome-middlewares/src/types/express.d.ts
@@ -0,0 +1,9 @@
+declare global {
+  namespace Express {
+    interface Request {
+      username: string | null;
+    }
+  }
+}
+
+export {};
diff --git a/custome-middlewares/tsconfig.json b/custome-middlewares/tsconfig.json
new file mode 100644
index 00000000..9f40b801
--- /dev/null
+++ b/custome-middlewares/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "es2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": ["src/**/*"]
+}
diff --git a/off-the-shelf-middlewares/.gitignore b/off-the-shelf-middlewares/.gitignore
new file mode 100644
index 00000000..3c3629e6
--- /dev/null
+++ b/off-the-shelf-middlewares/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/off-the-shelf-middlewares/dist/main.js b/off-the-shelf-middlewares/dist/main.js
new file mode 100644
index 00000000..c7bb8929
--- /dev/null
+++ b/off-the-shelf-middlewares/dist/main.js
@@ -0,0 +1,27 @@
+import express from "express";
+import usernameLoader from "./username_validator.js";
+const app = express();
+const port = 3000;
+app.use(express.json());
+app.post("/", usernameLoader, (req, res) => {
+    const subjects = req.body;
+    if (!subjects || !Array.isArray(subjects)) {
+        return res
+            .status(400)
+            .send("Bad Request: Expected a JSON array as the body payload.");
+    }
+    const count = subjects.length;
+    const subjectList = subjects.join(", ");
+    // 1. Format the authentication message using the custom header middleware
+    let authMessage = req.username
+        ? `You are authenticated as ${req.username}.`
+        : "You are not authenticated.";
+    // 2. Format the subject list counts from the array validator middleware
+    let subjectMessage = count === 1
+        ? `You have requested information about 1 subject: ${subjectList}.`
+        : `You have requested information about ${count} subjects${count > 0 ? ": " + subjectList : "."}`;
+    res.send(`${authMessage}\n\n${subjectMessage}`);
+});
+app.listen(port, () => {
+    console.log(`Middleware exercises server running on port ${port}`);
+});
diff --git a/off-the-shelf-middlewares/dist/username_validator.js b/off-the-shelf-middlewares/dist/username_validator.js
new file mode 100644
index 00000000..301fb446
--- /dev/null
+++ b/off-the-shelf-middlewares/dist/username_validator.js
@@ -0,0 +1,13 @@
+const usernameLoader = (req, res, next) => {
+    const usernameHeader = req.headers["x-username"];
+    if (typeof usernameHeader === "string") {
+        req.username = usernameHeader;
+    }
+    if (!req.username) {
+        return res
+            .status(401)
+            .send("Unauthorized: You must provide a valid x-username header.");
+    }
+    next();
+};
+export default usernameLoader;
diff --git a/off-the-shelf-middlewares/package-lock.json b/off-the-shelf-middlewares/package-lock.json
new file mode 100644
index 00000000..0970d1cf
--- /dev/null
+++ b/off-the-shelf-middlewares/package-lock.json
@@ -0,0 +1,1346 @@
+{
+  "name": "custom-middlewares",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "custom-middlewares",
+      "version": "1.0.0",
+      "dependencies": {
+        "express": "^4.19.2"
+      },
+      "devDependencies": {
+        "@types/express": "^4.17.21",
+        "@types/node": "^20.11.0",
+        "nodemon": "^3.1.0",
+        "typescript": "^5.3.3"
+      }
+    },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.6",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.6.tgz",
+      "integrity": "sha512-HLFeCYgz89uk22N5Qg3dvGvsv46B8GLvKKo1zKG4NybA8U2DiEO3w9lqGg29t/tfLRJpJ6iQxnVw4OnB7MoM9g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.38",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.38.tgz",
+      "integrity": "sha512-K6uROf1LD88uDQqJCktA4yzL1YYAK6NgfsI0v/mTgyPKWsX1CnJ0XPSDhViejru1GcRkLWb8RlzFYJRqGUbaug==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/express": {
+      "version": "4.17.25",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.25.tgz",
+      "integrity": "sha512-dVd04UKsfpINUnK0yBoYHDF3xu7xVH4BuDotC/xGuycx4CgbP48X/KF/586bcObxT0HENHXEU8Nqtu6NR+eKhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "^4.17.33",
+        "@types/qs": "*",
+        "@types/serve-static": "^1"
+      }
+    },
+    "node_modules/@types/express-serve-static-core": {
+      "version": "4.19.8",
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+      "dev": true,
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diff --git a/off-the-shelf-middlewares/package.json b/off-the-shelf-middlewares/package.json
new file mode 100644
index 00000000..01ba9c9a
--- /dev/null
+++ b/off-the-shelf-middlewares/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "custom-middlewares",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "dist/main.js",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/main.js",
+    "dev": "tsc --watch & nodemon dist/main.js"
+  },
+  "dependencies": {
+    "express": "^4.19.2"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.21",
+    "@types/node": "^20.11.0",
+    "nodemon": "^3.1.0",
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/off-the-shelf-middlewares/src/main.ts b/off-the-shelf-middlewares/src/main.ts
new file mode 100644
index 00000000..4ca83678
--- /dev/null
+++ b/off-the-shelf-middlewares/src/main.ts
@@ -0,0 +1,36 @@
+import express from "express";
+
+import usernameLoader from "./username_validator.js";
+
+const app = express();
+const port = 3000;
+
+app.use(express.json());
+
+app.post("/", usernameLoader, (req, res) => {
+  const subjects: string[] = req.body;
+  if (!subjects || !Array.isArray(subjects)) {
+    return res
+      .status(400)
+      .send("Bad Request: Expected a JSON array as the body payload.");
+  }
+  const count = subjects.length;
+  const subjectList = subjects.join(", ");
+
+  // 1. Format the authentication message using the custom header middleware
+  let authMessage = req.username
+    ? `You are authenticated as ${req.username}.`
+    : "You are not authenticated.";
+
+  // 2. Format the subject list counts from the array validator middleware
+  let subjectMessage =
+    count === 1
+      ? `You have requested information about 1 subject: ${subjectList}.`
+      : `You have requested information about ${count} subjects${count > 0 ? ": " + subjectList : "."}`;
+
+  res.send(`${authMessage}\n\n${subjectMessage}`);
+});
+
+app.listen(port, () => {
+  console.log(`Middleware exercises server running on port ${port}`);
+});
diff --git a/off-the-shelf-middlewares/src/types/express.d.ts b/off-the-shelf-middlewares/src/types/express.d.ts
new file mode 100644
index 00000000..097aff52
--- /dev/null
+++ b/off-the-shelf-middlewares/src/types/express.d.ts
@@ -0,0 +1,9 @@
+declare global {
+  namespace Express {
+    interface Request {
+      username: string | null;
+    }
+  }
+}
+
+export {};
diff --git a/off-the-shelf-middlewares/src/username_validator.ts b/off-the-shelf-middlewares/src/username_validator.ts
new file mode 100644
index 00000000..10648e52
--- /dev/null
+++ b/off-the-shelf-middlewares/src/username_validator.ts
@@ -0,0 +1,18 @@
+import type { Request, Response, NextFunction } from "express";
+
+const usernameLoader = (req: Request, res: Response, next: NextFunction) => {
+  const usernameHeader = req.headers["x-username"];
+
+  if (typeof usernameHeader === "string") {
+    req.username = usernameHeader;
+  }
+  if (!req.username) {
+    return res
+      .status(401)
+      .send("Unauthorized: You must provide a valid x-username header.");
+  }
+
+  next();
+};
+
+export default usernameLoader;
diff --git a/off-the-shelf-middlewares/tsconfig.json b/off-the-shelf-middlewares/tsconfig.json
new file mode 100644
index 00000000..9f40b801
--- /dev/null
+++ b/off-the-shelf-middlewares/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "es2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": ["src/**/*"]
+}