diff --git a/README.md b/README.md
index 7a1a02c..153131a 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-# Library_App
\ No newline at end of file
+# Library_App
diff --git a/app.js b/app.js
new file mode 100644
index 0000000..fc833b6
--- /dev/null
+++ b/app.js
@@ -0,0 +1,31 @@
+const express = require('express');
+const mongoose = require('mongoose');
+const bodyParser = require('body-parser');
+const app = express();
+
+
+app.use(bodyParser.json());
+
+
+mongoose.connect('mongodb://localhost:27107/librarydb', {
+  useNewUrlParser: true,
+  useUnifiedTopology: true,
+});
+
+
+const booksRoutes = require('./routes/booksRoutes');
+
+
+app.use('/api/books', booksRoutes);
+
+
+app.use((err, req, res, next) => {
+  console.error(err);
+  res.status(500).json({ error: 'Internal server error' });
+});
+
+
+const port = process.env.PORT || 3000;
+app.listen(port, () => {
+  console.log(`Server is running on port ${port}`);
+});
diff --git a/controllers/booksController.js b/controllers/booksController.js
new file mode 100644
index 0000000..50872d8
--- /dev/null
+++ b/controllers/booksController.js
@@ -0,0 +1,51 @@
+const Book = require('../models/Book');
+
+// Retrieve all books
+async function getAllBooks(req, res) {
+  try {
+    const books = await Book.find();
+    res.json(books);
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+}
+
+// Add a new book
+async function addBook(req, res) {
+  const { title, author, publicationYear } = req.body;
+  try {
+    const newBook = new Book({ title, author, publicationYear });
+    await newBook.save();
+    res.status(201).json(newBook);
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+}
+
+// Update book details
+async function updateBook(req, res) {
+  const bookId = req.params.id;
+  const { title, author, publicationYear } = req.body;
+  try {
+    const updatedBook = await Book.findByIdAndUpdate(
+      bookId,
+      { title, author, publicationYear },
+      { new: true }
+    );
+    if (!updatedBook) {
+      return res.status(404).json({ error: 'Book not found' });
+    }
+    res.json(updatedBook);
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+}
+
+module.exports = {
+  getAllBooks,
+  addBook,
+  updateBook,
+};
diff --git a/models/Book.js b/models/Book.js
new file mode 100644
index 0000000..361ecbd
--- /dev/null
+++ b/models/Book.js
@@ -0,0 +1,15 @@
+const mongoose = require('mongoose');
+
+const bookSchema = new mongoose.Schema({
+  title: {
+    type: String,
+    required: true,
+  },
+  author: {
+    type: String,
+    required: true,
+  },
+  publicationYear: Number,
+});
+
+module.exports = mongoose.model('Book', bookSchema);
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..dfc37bb
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,666 @@
+{
+  "name": "library_application",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@mongodb-js/saslprep": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@mongodb-js/saslprep/-/saslprep-1.1.1.tgz",
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+      "requires": {
+        "sparse-bitfield": "^3.0.3"
+      }
+    },
+    "@types/node": {
+      "version": "20.10.3",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.10.3.tgz",
+      "integrity": "sha512-XJavIpZqiXID5Yxnxv3RUDKTN5b81ddNC3ecsA0SoFXz/QU8OGBwZGMomiq0zw+uuqbL/krztv/DINAQ/EV4gg==",
+      "requires": {
+        "undici-types": "~5.26.4"
+      }
+    },
+    "@types/webidl-conversions": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/@types/webidl-conversions/-/webidl-conversions-7.0.3.tgz",
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+    },
+    "@types/whatwg-url": {
+      "version": "8.2.2",
+      "resolved": "https://registry.npmjs.org/@types/whatwg-url/-/whatwg-url-8.2.2.tgz",
+      "integrity": "sha512-FtQu10RWgn3D9U4aazdwIE2yzphmTJREDqNdODHrbrZmmMqI0vMheC/6NE/J1Yveaj8H+ela+YwWTjq5PGmuhA==",
+      "requires": {
+        "@types/node": "*",
+        "@types/webidl-conversions": "*"
+      }
+    },
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+      }
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..89125ba
--- /dev/null
+++ b/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "library_application",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "body-parser": "^1.20.2",
+    "express": "^4.18.2",
+    "mongoose": "^8.0.2"
+  }
+}
diff --git a/routes/booksRoutes.js b/routes/booksRoutes.js
new file mode 100644
index 0000000..ae05e32
--- /dev/null
+++ b/routes/booksRoutes.js
@@ -0,0 +1,18 @@
+const express = require('express');
+const router = express.Router();
+const {
+  getAllBooks,
+  addBook,
+  updateBook,
+} = require('../controllers/booksController');
+
+// Retrieve all books
+router.get('/', getAllBooks);
+
+// Add a new book
+router.post('/', addBook);
+
+// Update book details by ID
+router.put('/:id', updateBook);
+
+module.exports = router;