diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d71d649
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,43 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Node modules
+node_modules/
+jspm_packages/
+
+# Build files
+dist/
+build/
+
+# Environment variables
+.env
+
+# System files
+.DS_Store
+Thumbs.db
+
+# IDE files
+.idea/
+.vscode/
+*.swp
+
+# Coverage files
+coverage/
+
+# Debugger files
+*.tgz
+.nyc_output/
+
+# Temporary files
+tmp/
+temp/
diff --git a/app.js b/app.js
index b471157..d741ffb 100644
--- a/app.js
+++ b/app.js
@@ -1,182 +1,21 @@
-const { MongoClient } = require("mongodb");
-
-async function run() {
-  // TODO:
-  // Replace the placeholder connection string below with your
-  // Altas cluster specifics. Be sure it includes
-  // a valid username and password! Note that in a production environment,
-  // you do not want to store your password in plain-text here.
-  const uri =
-    "mongodb+srv://<user>:<password>@<cluster-url>?retryWrites=true&w=majority";
-
-  // The MongoClient is the object that references the connection to our
-  // datastore (Atlas, for example)
-  const client = new MongoClient(uri);
-
-  // The connect() method does not attempt a connection; instead it instructs
-  // the driver to connect using the settings provided when a connection
-  // is required.
-  await client.connect();
-
-  // Provide the name of the database and collection you want to use.
-  // If the database and/or collection do not exist, the driver and Atlas
-  // will create them automatically when you first write data.
-  const dbName = "myDatabase";
-  const collectionName = "recipes";
-
-  // Create references to the database and collection in order to run
-  // operations on them.
-  const database = client.db(dbName);
-  const collection = database.collection(collectionName);
-
-  /*
-   *  *** INSERT DOCUMENTS ***
-   *
-   * You can insert individual documents using collection.insert().
-   * In this example, we're going to create four documents and then
-   * insert them all in one call with collection.insertMany().
-   */
-
-  const recipes = [
-    {
-      name: "elotes",
-      ingredients: [
-        "corn",
-        "mayonnaise",
-        "cotija cheese",
-        "sour cream",
-        "lime",
-      ],
-      prepTimeInMinutes: 35,
-    },
-    {
-      name: "loco moco",
-      ingredients: [
-        "ground beef",
-        "butter",
-        "onion",
-        "egg",
-        "bread bun",
-        "mushrooms",
-      ],
-      prepTimeInMinutes: 54,
-    },
-    {
-      name: "patatas bravas",
-      ingredients: [
-        "potato",
-        "tomato",
-        "olive oil",
-        "onion",
-        "garlic",
-        "paprika",
-      ],
-      prepTimeInMinutes: 80,
-    },
-    {
-      name: "fried rice",
-      ingredients: [
-        "rice",
-        "soy sauce",
-        "egg",
-        "onion",
-        "pea",
-        "carrot",
-        "sesame oil",
-      ],
-      prepTimeInMinutes: 40,
-    },
-  ];
-
-  try {
-    const insertManyResult = await collection.insertMany(recipes);
-    console.log(`${insertManyResult.insertedCount} documents successfully inserted.\n`);
-  } catch (err) {
-    console.error(`Something went wrong trying to insert the new documents: ${err}\n`);
-  }
-
-  /*
-   * *** FIND DOCUMENTS ***
-   *
-   * Now that we have data in Atlas, we can read it. To retrieve all of
-   * the data in a collection, we call Find() with an empty filter.
-   * The Builders class is very helpful when building complex
-   * filters, and is used here to show its most basic use.
-   */
-
-  const findQuery = { prepTimeInMinutes: { $lt: 45 } };
-
-  try {
-    const cursor = await collection.find(findQuery).sort({ name: 1 });
-    await cursor.forEach(recipe => {
-      console.log(`${recipe.name} has ${recipe.ingredients.length} ingredients and takes ${recipe.prepTimeInMinutes} minutes to make.`);
-    });
-    // add a linebreak
-    console.log();
-  } catch (err) {
-    console.error(`Something went wrong trying to find the documents: ${err}\n`);
-  }
-
-  // We can also find a single document. Let's find the first document
-  // that has the string "potato" in the ingredients list.
-  const findOneQuery = { ingredients: "potato" };
-
-  try {
-    const findOneResult = await collection.findOne(findOneQuery);
-    if (findOneResult === null) {
-      console.log("Couldn't find any recipes that contain 'potato' as an ingredient.\n");
-    } else {
-      console.log(`Found a recipe with 'potato' as an ingredient:\n${JSON.stringify(findOneResult)}\n`);
-    }
-  } catch (err) {
-    console.error(`Something went wrong trying to find one document: ${err}\n`);
-  }
-
-  /*
-   * *** UPDATE A DOCUMENT ***
-   *
-   * You can update a single document or multiple documents in a single call.
-   *
-   * Here we update the PrepTimeInMinutes value on the document we
-   * just found.
-   */
-  const updateDoc = { $set: { prepTimeInMinutes: 72 } };
-
-  // The following updateOptions document specifies that we want the *updated*
-  // document to be returned. By default, we get the document as it was *before*
-  // the update.
-  const updateOptions = { returnOriginal: false };
-
-  try {
-    const updateResult = await collection.findOneAndUpdate(
-      findOneQuery,
-      updateDoc,
-      updateOptions,
-    );
-    console.log(`Here is the updated document:\n${JSON.stringify(updateResult.value)}\n`);
-  } catch (err) {
-    console.error(`Something went wrong trying to update one document: ${err}\n`);
-  }
-
-  /*      *** DELETE DOCUMENTS ***
-   *
-   *      As with other CRUD methods, you can delete a single document
-   *      or all documents that match a specified filter. To delete all
-   *      of the documents in a collection, pass an empty filter to
-   *      the DeleteMany() method. In this example, we'll delete two of
-   *      the recipes.
-   */
-
-
-  const deleteQuery = { name: { $in: ["elotes", "fried rice"] } };
-  try {
-    const deleteResult = await collection.deleteMany(deleteQuery);
-    console.log(`Deleted ${deleteResult.deletedCount} documents\n`);
-  } catch (err) {
-    console.error(`Something went wrong trying to delete documents: ${err}\n`);
-  }
-
-  // Make sure to call close() on your client to perform cleanup operations
-  await client.close();
-}
-run().catch(console.dir);
+require("dotenv").config();
+const express = require("express");
+const cors = require("cors");
+const connectToDatabase = require("./config");
+const todoRoutes = require("./routes");
+
+const app = express();
+app.use(express.json());
+app.use(cors());
+
+(async () => {
+  const todoCollection = await connectToDatabase();
+
+  // Mount routes
+  app.use("/todos", todoRoutes(todoCollection));
+
+  const PORT = process.env.PORT || 3000;
+  app.listen(PORT, () => {
+    console.log(`Server is running on http://localhost:${PORT}`);
+  });
+})();
diff --git a/config.js b/config.js
new file mode 100644
index 0000000..06057a0
--- /dev/null
+++ b/config.js
@@ -0,0 +1,18 @@
+const { MongoClient } = require("mongodb");
+
+const uri = process.env.URI; // Use an environment variable
+const client = new MongoClient(uri, { useUnifiedTopology: true });
+
+async function connectToDatabase() {
+  try {
+    await client.connect();
+    console.log("Connected to MongoDB!");
+    const db = client.db("myDatabase");
+    return db.collection("todos");
+  } catch (err) {
+    console.error("Failed to connect to MongoDB:", err.message);
+    process.exit(1);
+  }
+}
+
+module.exports = connectToDatabase;
diff --git a/modal/schema.js b/modal/schema.js
new file mode 100644
index 0000000..648dafb
--- /dev/null
+++ b/modal/schema.js
@@ -0,0 +1,12 @@
+const Joi = require("joi");
+
+// Define the schema for a todo item
+const todoSchema = Joi.object({
+  title: Joi.string().required().messages({
+    "string.empty": "Title cannot be empty",
+    "any.required": "Title is required",
+  }),
+  completed: Joi.boolean().default(false),
+});
+
+module.exports = todoSchema;
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..94a55c6
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1056 @@
+{
+  "name": "atlas_starter_nodejs",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "atlas_starter_nodejs",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "cors": "^2.8.5",
+        "dotenv": "^16.4.7",
+        "express": "^4.21.2",
+        "joi": "^17.13.3",
+        "mongodb": "^3.5.9"
+      }
+    },
+    "node_modules/@hapi/hoek": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz",
+      "integrity": "sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@hapi/topo": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@hapi/topo/-/topo-5.1.0.tgz",
+      "integrity": "sha512-foQZKJig7Ob0BMAYBfcJk8d77QtOe7Wo4ox7ff1lQYoNNAb6jwcY1ncdoy2e9wQZzvNy7ODZCYJkK8kzmcAnAg==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "node_modules/@sideway/address": {
+      "version": "4.1.5",
+      "resolved": "https://registry.npmjs.org/@sideway/address/-/address-4.1.5.tgz",
+      "integrity": "sha512-IqO/DUQHUkPeixNQ8n0JA6102hT9CmaljNTPmQ1u8MEhBo/R4Q8eKLN/vGZxuebwOroDB4cbpjheD4+/sKFK4Q==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "node_modules/@sideway/formula": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sideway/formula/-/formula-3.0.1.tgz",
+      "integrity": "sha512-/poHZJJVjx3L+zVD6g9KgHfYnb443oi7wLu/XKojDviHy6HOEOA6z1Trk5aR1dGcmPenJEgb2sK2I80LeS3MIg==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@sideway/pinpoint": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@sideway/pinpoint/-/pinpoint-2.0.0.tgz",
+      "integrity": "sha512-RNiOoTPkptFtSVzQevY/yWtZwf/RxyVnPy/OcA9HBM3MlGDnBEYL5B41H0MTn0Uec8Hi+2qUtTfG2WWZBmMejQ==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+      "license": "MIT"
+    },
+    "node_modules/bl": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-2.2.1.tgz",
+      "integrity": "sha512-6Pesp1w0DEX1N550i/uGV/TqucVL4AM/pgThFSN/Qq9si1/DF9aIHs1BxD8V/QU0HoeHO6cQRTAuYnLPKq1e4g==",
+      "license": "MIT",
+      "dependencies": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      }
+    },
+    "node_modules/body-parser": {
+      "version": "1.20.3",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.3.tgz",
+      "integrity": "sha512-7rAxByjUMqQ3/bHJy7D6OGXvx/MMc4IqBn/X0fcM1QUcAItpZrBEYhWGem+tzXH90c+G01ypMcYJBO9Y30203g==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "3.1.2",
+        "content-type": "~1.0.5",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "on-finished": "2.4.1",
+        "qs": "6.13.0",
+        "raw-body": "2.5.2",
+        "type-is": "~1.6.18",
+        "unpipe": "1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
+    "node_modules/bson": {
+      "version": "1.1.6",
+      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.6.tgz",
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+      "license": "Apache-2.0",
+      "engines": {
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+      }
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/call-bind": {
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+      "license": "MIT",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.0",
+        "es-define-property": "^1.0.0",
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+      },
+      "engines": {
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+      },
+      "funding": {
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+      }
+    },
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+      },
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+        "vary": "^1"
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+      "dependencies": {
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+      "license": "MIT",
+      "engines": {
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+      },
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+      },
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+      }
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+      "license": "MIT"
+    },
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+      "license": "Apache-2.0",
+      "engines": {
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+      }
+    },
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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"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/safer-buffer": {
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+      "license": "MIT"
+    },
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+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "sparse-bitfield": "^3.0.3"
+      },
+      "engines": {
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+        "statuses": "2.0.1"
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+      "integrity": "sha512-VqpjJZKadQB/PEbEwvFdO43Ax5dFBZ2UECszz8bQ7pi7wt//PWe1P6MN7eCnjsatYtBT6EuiClbjSWP2WrIoTw==",
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+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2",
+        "get-intrinsic": "^1.2.4",
+        "gopd": "^1.0.1",
+        "has-property-descriptors": "^1.0.2"
+      },
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+      }
+    },
+    "node_modules/setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
+      "license": "ISC"
+    },
+    "node_modules/side-channel": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.6.tgz",
+      "integrity": "sha512-fDW/EZ6Q9RiO8eFG8Hj+7u/oW+XrPTIChwCOM2+th2A6OblDtYYIpve9m+KvI9Z4C9qSEXlaGR6bTEYHReuglA==",
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+        "call-bind": "^1.0.7",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.4",
+        "object-inspect": "^1.13.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/sparse-bitfield": {
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+      "optional": true,
+      "dependencies": {
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+      "license": "MIT",
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+      "license": "MIT"
+    },
+    "node_modules/utils-merge": {
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+      "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/package.json b/package.json
index f902b99..11023ef 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,10 @@
   },
   "homepage": "https://github.com/mongodb-university/atlas_starter_nodejs#readme",
   "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.7",
+    "express": "^4.21.2",
+    "joi": "^17.13.3",
     "mongodb": "^3.5.9"
   }
 }
diff --git a/routes.js b/routes.js
new file mode 100644
index 0000000..ddbfe79
--- /dev/null
+++ b/routes.js
@@ -0,0 +1,60 @@
+const express = require("express");
+const { ObjectId } = require("mongodb");
+const todoSchema = require("./modal/schema");
+
+const router = express.Router();
+
+module.exports = (todoCollection) => {
+  // Create a new to-do
+  router.post("/", async (req, res) => {
+    try {
+      const { error, value } = todoSchema.validate(req.body);
+      if (error) return res.status(400).json({ message: error.details[0].message });
+
+      const result = await todoCollection.insertOne(value);
+      res.status(201).json(result);
+    } catch (err) {
+      res.status(500).json({ message: "Error creating todo", error: err.message });
+    }
+  });
+
+  // Get all to-dos
+  router.get("/", async (req, res) => {
+    try {
+      const todos = await todoCollection.find().toArray();
+      res.status(200).json(todos);
+    } catch (err) {
+      res.status(500).json({ message: "Error fetching todos", error: err.message });
+    }
+  });
+
+  // Update a to-do
+  router.put("/:id", async (req, res) => {
+    try {
+      const id = req.params.id;
+      const { error, value } = todoSchema.validate(req.body);
+      if (error) return res.status(400).json({ message: error.details[0].message });
+
+      const result = await todoCollection.updateOne(
+        { _id: new ObjectId(id) },
+        { $set: value }
+      );
+      res.status(200).json(result);
+    } catch (err) {
+      res.status(500).json({ message: "Error updating todo", error: err.message });
+    }
+  });
+
+  // Delete a to-do
+  router.delete("/:id", async (req, res) => {
+    try {
+      const id = req.params.id;
+      const result = await todoCollection.deleteOne({ _id: new ObjectId(id) });
+      res.status(200).json(result);
+    } catch (err) {
+      res.status(500).json({ message: "Error deleting todo", error: err.message });
+    }
+  });
+
+  return router;
+};