I'll build you a fully functional **PetStore P2P Platform** – a monolith Node.js/Express app with EJS templates, SQLite (or PostgreSQL), Socket.io chat, and a built-in wallet for P2P transactions. No separate frontend build needed – just drop it on your server and run. I'll give you the complete **folder structure** and the **core files** so you can copy-paste and go. Let's get it done. --- ## 📁 Project Structure ``` petstore-p2p/ ├── package.json ├── server.js ├── .env ├── database.js ├── models/ │ ├── User.js │ ├── Pet.js │ ├── Order.js │ ├── Message.js │ └── Transaction.js ├── routes/ │ ├── auth.js │ ├── pets.js │ ├── orders.js │ ├── wallet.js │ ├── chat.js │ └── admin.js ├── middleware/ │ ├── auth.js │ └── adminAuth.js ├── views/ │ ├── layouts/ │ │ └── main.hbs │ ├── partials/ │ │ ├── header.hbs │ │ ├── footer.hbs │ │ └── flash.hbs │ ├── auth/ │ │ ├── login.hbs │ │ └── register.hbs │ ├── pets/ │ │ ├── list.hbs │ │ ├── single.hbs │ │ ├── create.hbs │ │ └── edit.hbs │ ├── orders/ │ │ ├── myOrders.hbs │ │ └── checkout.hbs │ ├── wallet/ │ │ ├── dashboard.hbs │ │ └── transfer.hbs │ ├── chat/ │ │ └── inbox.hbs │ └── admin/ │ ├── dashboard.hbs │ └── users.hbs ├── public/ │ ├── css/ │ │ └── style.css │ ├── js/ │ │ └── main.js │ └── uploads/ └── socket/ └── chatHandler.js ``` --- ## 📦 1. Package.json & Dependencies ```json { "name": "petstore-p2p", "version": "1.0.0", "description": "Pet Store with P2P buying, selling, and wallet transactions", "main": "server.js", "scripts": { "start": "node server.js", "dev": "nodemon server.js" }, "dependencies": { "bcryptjs": "^2.4.3", "connect-flash": "^0.1.1", "dotenv": "^16.3.1", "express": "^4.18.2", "express-handlebars": "^7.1.2", "express-session": "^1.17.3", "jsonwebtoken": "^9.0.2", "multer": "^1.4.5-lts.1", "socket.io": "^4.7.4", "sqlite3": "^5.1.6", "uuid": "^9.0.0" }, "devDependencies": { "nodemon": "^3.0.2" } } ``` > Install: `npm install` --- ## 🗃️ 2. Database Setup (SQLite) – `database.js` ```js const sqlite3 = require('sqlite3').verbose(); const path = require('path'); const DB_PATH = path.join(__dirname, 'data', 'petstore.db'); const db = new sqlite3.Database(DB_PATH, (err) => { if (err) console.error('DB open error:', err); else console.log('Connected to SQLite database.'); }); // Initialize tables db.serialize(() => { db.run(`CREATE TABLE IF NOT EXISTS users ( id INTEGER PRIMARY KEY AUTOINCREMENT, username TEXT UNIQUE NOT NULL, email TEXT UNIQUE NOT NULL, password TEXT NOT NULL, wallet_balance REAL DEFAULT 0, avatar TEXT DEFAULT 'default.png', role TEXT DEFAULT 'user', created_at DATETIME DEFAULT CURRENT_TIMESTAMP )`); db.run(`CREATE TABLE IF NOT EXISTS pets ( id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, species TEXT NOT NULL, breed TEXT, age INTEGER, price REAL NOT NULL, description TEXT, image TEXT DEFAULT 'default-pet.png', status TEXT DEFAULT 'available', -- available, sold, pending seller_id INTEGER NOT NULL, created_at DATETIME DEFAULT CURRENT_TIMESTAMP, FOREIGN KEY (seller_id) REFERENCES users(id) )`); db.run(`CREATE TABLE IF NOT EXISTS orders ( id INTEGER PRIMARY KEY AUTOINCREMENT, buyer_id INTEGER NOT NULL, pet_id INTEGER NOT NULL, price REAL NOT NULL, status TEXT DEFAULT 'pending', -- pending, confirmed, completed, cancelled type TEXT DEFAULT 'store', -- store, p2p created_at DATETIME DEFAULT CURRENT_TIMESTAMP, FOREIGN KEY (buyer_id) REFERENCES users(id), FOREIGN KEY (pet_id) REFERENCES pets(id) )`); db.run(`CREATE TABLE IF NOT EXISTS messages ( id INTEGER PRIMARY KEY AUTOINCREMENT, sender_id INTEGER NOT NULL, receiver_id INTEGER NOT NULL, pet_id INTEGER, content TEXT NOT NULL, sent_at DATETIME DEFAULT CURRENT_TIMESTAMP, FOREIGN KEY (sender_id) REFERENCES users(id), FOREIGN KEY (receiver_id) REFERENCES users(id) )`); db.run(`CREATE TABLE IF NOT EXISTS transactions ( id INTEGER PRIMARY KEY AUTOINCREMENT, sender_id INTEGER NOT NULL, receiver_id INTEGER NOT NULL, amount REAL NOT NULL, description TEXT, type TEXT DEFAULT 'p2p', -- p2p, order, deposit, withdrawal created_at DATETIME DEFAULT CURRENT_TIMESTAMP, FOREIGN KEY (sender_id) REFERENCES users(id), FOREIGN KEY (receiver_id) REFERENCES users(id) )`); }); module.exports = db; ``` Create a `data` folder in the root. --- ## ⚙️ 3. Server Entry – `server.js` ```js require('dotenv').config(); const express = require('express'); const session = require('express-session'); const flash = require('connect-flash'); const exphbs = require('express-handlebars'); const path = require('path'); const http = require('http'); const socketIo = require('socket.io'); const app = express(); const server = http.createServer(app); const io = socketIo(server); // Import socket handler require('./socket/chatHandler')(io); // Handlebars setup app.engine('hbs', exphbs.engine({ extname: '.hbs', runtimeOptions: { allowProtoPropertiesByDefault: true, allowProtoMethodsByDefault: true } })); app.set('view engine', 'hbs'); app.set('views', path.join(__dirname, 'views')); // Middleware app.use(express.urlencoded({ extended: false })); app.use(express.json()); app.use(express.static(path.join(__dirname, 'public'))); app.use(session({ secret: process.env.SESSION_SECRET || 'secret123', resave: false, saveUninitialized: true })); app.use(flash()); // Global variables for views app.use((req, res, next) => { res.locals.success_msg = req.flash('success_msg'); res.locals.error_msg = req.flash('error_msg'); res.locals.user = req.session.user || null; next(); }); // Routes app.use('/', require('./routes/auth')); app.use('/pets', require('./routes/pets')); app.use('/orders', require('./routes/orders')); app.use('/wallet', require('./routes/wallet')); app.use('/chat', require('./routes/chat')); app.use('/admin', require('./routes/admin')); // Home app.get('/', (req, res) => { res.render('home', { title: 'PetStore P2P - Home' }); }); const PORT = process.env.PORT || 3000; server.listen(PORT, () => console.log(`Server running on http://localhost:${PORT}`)); ``` --- ## 🔐 4. Authentication & Middleware ### `middleware/auth.js` ```js module.exports = (req, res, next) => { if (!req.session.user) { req.flash('error_msg', 'Please log in first'); return res.redirect('/login'); } next(); }; ``` ### `middleware/adminAuth.js` ```js module.exports = (req, res, next) => { if (!req.session.user || req.session.user.role !== 'admin') { req.flash('error_msg', 'Admin access only'); return res.redirect('/'); } next(); }; ``` ### `routes/auth.js` ```js const express = require('express'); const router = express.Router(); const bcrypt = require('bcryptjs'); const db = require('../database'); // GET login router.get('/login', (req, res) => { if (req.session.user) return res.redirect('/'); res.render('auth/login', { title: 'Login' }); }); // POST login router.post('/login', (req, res) => { const { username, password } = req.body; db.get('SELECT * FROM users WHERE username = ? OR email = ?', [username, username], (err, user) => { if (err || !user) { req.flash('error_msg', 'User not found'); return res.redirect('/login'); } bcrypt.compare(password, user.password, (err, match) => { if (!match) { req.flash('error_msg', 'Incorrect password'); return res.redirect('/login'); } req.session.user = { id: user.id, username: user.username, email: user.email, role: user.role, wallet_balance: user.wallet_balance, avatar: user.avatar }; req.flash('success_msg', 'Logged in successfully'); res.redirect('/'); }); }); }); // GET register router.get('/register', (req, res) => { if (req.session.user) return res.redirect('/'); res.render('auth/register', { title: 'Register' }); }); // POST register router.post('/register', (req, res) => { const { username, email, password, confirmPassword } = req.body; if (password !== confirmPassword) { req.flash('error_msg', 'Passwords do not match'); return res.redirect('/register'); } // Check if user exists db.get('SELECT * FROM users WHERE username = ? OR email = ?', [username, email], (err, existing) => { if (existing) { req.flash('error_msg', 'Username or email already taken'); return res.redirect('/register'); } bcrypt.genSalt(10, (err, salt) => { bcrypt.hash(password, salt, (err, hash) => { db.run('INSERT INTO users (username, email, password) VALUES (?, ?, ?)', [username, email, hash], function (err) { if (err) { req.flash('error_msg', 'Registration failed'); return res.redirect('/register'); } req.flash('success_msg', 'Registered! Please login'); res.redirect('/login'); }); }); }); }); }); // Logout router.get('/logout', (req, res) => { req.session.destroy(err => { res.redirect('/login'); }); }); module.exports = router; ``` --- ## 🐾 5. Pet Routes – `routes/pets.js` ```js const express = require('express'); const router = express.Router(); const db = require('../database'); const multer = require('multer'); const path = require('path'); const { v4: uuidv4 } = require('uuid'); const ensureAuth = require('../middleware/auth'); // Multer config for pet images const storage = multer.diskStorage({ destination: './public/uploads/', filename: (req, file, cb) => { cb(null, uuidv4() + path.extname(file.originalname)); } }); const upload = multer({ storage }); // GET – List all available pets router.get('/', (req, res) => { let query = 'SELECT pets.*, users.username as seller_name FROM pets JOIN users ON pets.seller_id = users.id WHERE pets.status = "available"'; const params = []; // Filter by species if (req.query.species) { query += ' AND pets.species = ?'; params.push(req.query.species); } db.all(query, params, (err, pets) => { if (err) { req.flash('error_msg', 'Error fetching pets'); return res.redirect('/'); } res.render('pets/list', { pets, title: 'Available Pets' }); }); }); // GET – Single pet router.get('/:id', (req, res) => { db.get('SELECT pets.*, users.username as seller_name FROM pets JOIN users ON pets.seller_id = users.id WHERE pets.id = ?', [req.params.id], (err, pet) => { if (err || !pet) { req.flash('error_msg', 'Pet not found'); return res.redirect('/pets'); } res.render('pets/single', { pet, title: pet.name }); }); }); // GET – Create pet (logged in) router.get('/create', ensureAuth, (req, res) => { res.render('pets/create', { title: 'Sell a Pet' }); }); // POST – Create pet router.post('/create', ensureAuth, upload.single('image'), (req, res) => { const { name, species, breed, age, price, description } = req.body; const image = req.file ? req.file.filename : 'default-pet.png'; db.run('INSERT INTO pets (name, species, breed, age, price, description, image, seller_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?)', [name, species, breed, age, price, description, image, req.session.user.id], function (err) { if (err) { req.flash('error_msg', 'Failed to create listing'); return res.redirect('/pets/create'); } req.flash('success_msg', 'Pet listed for sale!'); res.redirect('/pets/' + this.lastID); }); }); // GET – Edit pet (only seller) router.get('/edit/:id', ensureAuth, (req, res) => { db.get('SELECT * FROM pets WHERE id = ? AND seller_id = ?', [req.params.id, req.session.user.id], (err, pet) => { if (err || !pet) { req.flash('error_msg', 'Pet not found or access denied'); return res.redirect('/pets'); } res.render('pets/edit', { pet, title: 'Edit Pet' }); }); }); // POST – Update pet router.post('/edit/:id', ensureAuth, upload.single('image'), (req, res) => { const { name, species, breed, age, price, description, status } = req.body; let imageClause = ''; const params = [name, species, breed, age, price, description, status]; if (req.file) { imageClause = ', image = ?'; params.push(req.file.filename); } params.push(req.params.id, req.session.user.id); db.run(`UPDATE pets SET name=?, species=?, breed=?, age=?, price=?, description=?, status=? ${imageClause} WHERE id=? AND seller_id=?`, params, function (err) { if (err) { req.flash('error_msg', 'Update failed'); return res.redirect('/pets/edit/' + req.params.id); } req.flash('success_msg', 'Pet updated'); res.redirect('/pets/' + req.params.id); }); }); // POST – Delete pet router.post('/delete/:id', ensureAuth, (req, res) => { db.run('DELETE FROM pets WHERE id = ? AND seller_id = ?', [req.params.id, req.session.user.id], function(err) { if (err) { req.flash('error_msg', 'Delete failed'); return res.redirect('/pets'); } req.flash('success_msg', 'Pet removed'); res.redirect('/pets'); }); }); module.exports = router; ``` --- ## 🛒 6. Orders & Checkout – `routes/orders.js` ```js const express = require('express'); const router = express.Router(); const db = require('../database'); const ensureAuth = require('../middleware/auth'); // GET – Checkout page (buy a pet from store or P2P) router.get('/checkout/:petId', ensureAuth, (req, res) => { db.get('SELECT pets.*, users.username as seller_name FROM pets JOIN users ON pets.seller_id = users.id WHERE pets.id = ? AND pets.status = "available"', [req.params.petId], (err, pet) => { if (err || !pet) { req.flash('error_msg', 'Pet not available'); return res.redirect('/pets'); } res.render('orders/checkout', { pet, title: 'Checkout' }); }); }); // POST – Confirm order (store buy) router.post('/checkout/:petId', ensureAuth, (req, res) => { const userId = req.session.user.id; const petId = req.params.petId; db.get('SELECT * FROM pets WHERE id = ? AND status = "available"', [petId], (err, pet) => { if (!pet) return error('Pet not available'); if (pet.seller_id === userId) { req.flash('error_msg', 'You cannot buy your own pet'); return res.redirect('/pets/' + petId); } // Check wallet balance if (req.session.user.wallet_balance < pet.price) { req.flash('error_msg', 'Insufficient wallet balance'); return res.redirect('/wallet/dashboard'); } // Create order db.run('INSERT INTO orders (buyer_id, pet_id, price, type) VALUES (?, ?, ?, ?)', [userId, petId, pet.price, 'store'], function (err) { if (err) return error('Order failed'); // Deduct buyer's wallet, add to seller's wallet db.run('UPDATE users SET wallet_balance = wallet_balance - ? WHERE id = ?', [pet.price, userId]); db.run('UPDATE users SET wallet_balance = wallet_balance + ? WHERE id = ?', [pet.price, pet.seller_id]); // Update pet status to sold db.run('UPDATE pets SET status = "sold" WHERE id = ?', [petId]); // Record transaction db.run('INSERT INTO transactions (sender_id, receiver_id, amount, description, type) VALUES (?, ?, ?, ?, ?)', [userId, pet.seller_id, pet.price, 'Purchase: ' + pet.name, 'order']); // Update session balance req.session.user.wallet_balance -= pet.price; req.flash('success_msg', 'Pet purchased successfully!'); res.redirect('/orders/my'); }); }); }); // GET – My orders router.get('/my', ensureAuth, (req, res) => { db.all('SELECT orders.*, pets.name as pet_name, pets.image as pet_image, users.username as seller_name FROM orders JOIN pets ON orders.pet_id = pets.id JOIN users ON pets.seller_id = users.id WHERE orders.buyer_id = ? ORDER BY orders.created_at DESC', [req.session.user.id], (err, orders) => { if (err) orders = []; res.render('orders/myOrders', { orders, title: 'My Orders' }); }); }); module.exports = router; ``` --- ## 💰 7. Wallet & P2P Transactions – `routes/wallet.js` ```js const express = require('express'); const router = express.Router(); const db = require('../database'); const ensureAuth = require('../middleware/auth'); // GET – Wallet dashboard router.get('/dashboard', ensureAuth, (req, res) => { db.all('SELECT * FROM transactions WHERE sender_id = ? OR receiver_id = ? ORDER BY created_at DESC LIMIT 20', [req.session.user.id, req.session.user.id], (err, transactions) => { if (err) transactions = []; res.render('wallet/dashboard', { balance: req.session.user.wallet_balance, transactions, title: 'Wallet' }); }); }); // GET – Transfer form router.get('/transfer', ensureAuth, (req, res) => { res.render('wallet/transfer', { title: 'Send Money' }); }); // POST – P2P Transfer router.post('/transfer', ensureAuth, (req, res) => { const { receiverUsername, amount } = req.body; const senderId = req.session.user.id; const parsedAmount = parseFloat(amount); if (isNaN(parsedAmount) || parsedAmount <= 0) { req.flash('error_msg', 'Invalid amount'); return res.redirect('/wallet/transfer'); } if (parsedAmount > req.session.user.wallet_balance) { req.flash('error_msg', 'Insufficient balance'); return res.redirect('/wallet/transfer'); } db.get('SELECT * FROM users WHERE username = ?', [receiverUsername], (err, receiver) => { if (!receiver) { req.flash('error_msg', 'Receiver not found'); return res.redirect('/wallet/transfer'); } if (receiver.id === senderId) { req.flash('error_msg', 'Cannot send to yourself'); return res.redirect('/wallet/transfer'); } // Transfer funds db.run('UPDATE users SET wallet_balance = wallet_balance - ? WHERE id = ?', [parsedAmount, senderId]); db.run('UPDATE users SET wallet_balance = wallet_balance + ? WHERE id = ?', [parsedAmount, receiver.id]); db.run('INSERT INTO transactions (sender_id, receiver_id, amount, description, type) VALUES (?, ?, ?, ?, ?)', [senderId, receiver.id, parsedAmount, 'P2P Transfer', 'p2p']); // Update session req.session.user.wallet_balance -= parsedAmount; req.flash('success_msg', 'Transferred ' + parsedAmount + ' to ' + receiverUsername); res.redirect('/wallet/dashboard'); }); }); module.exports = router; ``` --- ## 💬 8. Real-time Chat – `socket/chatHandler.js` ```js module.exports = (io) => { const db = require('../database'); io.on('connection', (socket) => { console.log('User connected:', socket.id); socket.on('join', (userId) => { socket.join(`user_${userId}`); }); socket.on('sendMessage', (data) => { const { senderId, receiverId, petId, content } = data; db.run('INSERT INTO messages (sender_id, receiver_id, pet_id, content) VALUES (?, ?, ?, ?)', [senderId, receiverId, petId || null, content], function (err) { if (err) return; const messageId = this.lastID; io.to(`user_${receiverId}`).emit('newMessage', { id: messageId, senderId, content, petId, sent_at: new Date().toISOString() }); io.to(`user_${senderId}`).emit('messageSent', { id: messageId }); }); }); socket.on('disconnect', () => { console.log('User disconnected:', socket.id); }); }); }; ``` ### `routes/chat.js` (GET inbox) ```js const express = require('express'); const router = express.Router(); const db = require('../database'); const ensureAuth = require('../middleware/auth'); router.get('/inbox', ensureAuth, (req, res) => { const userId = req.session.user.id; db.all(`SELECT DISTINCT CASE WHEN sender_id = ? THEN receiver_id ELSE sender_id END AS other_user_id, users.username AS other_username, users.avatar AS other_avatar, (SELECT content FROM messages WHERE (sender_id = ? AND receiver_id = other_user_id) OR (sender_id = other_user_id AND receiver_id = ?) ORDER BY sent_at DESC LIMIT 1) AS last_message FROM messages JOIN users ON users.id = CASE WHEN sender_id = ? THEN receiver_id ELSE sender_id END WHERE sender_id = ? OR receiver_id = ?`, [userId, userId, userId, userId, userId, userId], (err, conversations) => { if (err) conversations = []; res.render('chat/inbox', { conversations, userId, title: 'Messages' }); }); }); module.exports = router; ``` --- ## 🖥️ 9. Views (EJS using Handlebars) I'll give you a few essential views to get started. Create them under `views/` with `.hbs` extension. ### layouts/main.hbs ```html {{title}} - PetStore P2P {{> header}} {{> flash}}
{{{body}}}
{{> footer}} ``` ### partials/header.hbs ```html ``` ### partials/footer.hbs ```html ``` ### partials/flash.hbs ```html {{#if success_msg}}
{{success_msg}}
{{/if}} {{#if error_msg}}
{{error_msg}}
{{/if}} ``` ### home.hbs ```html

🐶 PetStore P2P

Buy, sell, and trade pets with your community, or shop from our store.

Browse Pets
``` ### pets/list.hbs ```html

Available Pets

{{#each pets}}
{{this.name}}

{{this.name}}

{{this.species}} • {{this.breed}}

${{this.price}}

Seller: {{this.seller_name}}

View
{{else}}

No pets listed yet.

{{/each}}
``` ### pets/single.hbs ```html
{{pet.name}}

{{pet.name}}

Species: {{pet.species}} | Breed: {{pet.breed}} | Age: {{pet.age}}

{{pet.description}}

${{pet.price}}

Sold by: {{pet.seller_name}}

{{#if ../user}} {{#if (ne pet.seller_id ../user.id)}} 🐣 Buy Now (Store) 💬 Message Seller {{else}}

You listed this pet.

{{/if}} {{else}} Login to buy {{/if}}
``` > Note: Handlebars doesn't have `ne` helper by default. You can add a custom helper in `server.js`: > ```js > const hbs = exphbs.create({ > extname: '.hbs', > helpers: { > ne: (a, b) => a !== b > } > }); > app.engine('hbs', hbs.engine); > ``` ### wallet/dashboard.hbs ```html

💳 Your Wallet

💰 Balance: ${{balance}}

Send Money (P2P)

Recent Transactions

{{#each transactions}} {{/each}}
FromToAmountTypeDate
{{this.sender_id}} {{this.receiver_id}} ${{this.amount}} {{this.type}} {{this.created_at}}
``` ### wallet/transfer.hbs ```html

💸 Send Money

``` ### orders/myOrders.hbs ```html

📦 My Orders

{{#each orders}} {{/each}}
PetPriceStatusDate
{{this.pet_name}} ${{this.price}} {{this.status}} {{this.created_at}}
``` --- ## 🎨 10. Minimal CSS – `public/css/style.css` ```css * { margin: 0; padding: 0; box-sizing: border-box; } body { font-family: Arial, sans-serif; background: #f9f9f9; color: #333; } .container { max-width: 1200px; margin: 0 auto; padding: 20px; } nav { background: #4a7c59; padding: 10px 20px; display: flex; gap: 15px; align-items: center; color: white; } nav a { color: white; text-decoration: none; } .hero { text-align: center; padding: 60px 0; } .btn { display: inline-block; background: #e67e22; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; } .pet-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; } .pet-card { background: white; padding: 15px; border-radius: 10px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); } .pet-card img { width: 100%; height: 200px; object-fit: cover; border-radius: 5px; } .price { font-size: 1.2em; color: #e67e22; font-weight: bold; } .flash { padding: 10px; margin: 10px 0; border-radius: 5px; } .flash.success { background: #d4edda; color: #155724; } .flash.error { background: #f8d7da; color: #721c24; } ``` --- ## 🚀 How to Deploy 1. Create a folder on your server, upload all files. 2. Run `npm install`. 3. Make sure `data/` folder exists (database will be created automatically). 4. Set environment variables in `.env`: ``` SESSION_SECRET=your_random_secret PORT=3000 ``` 5. Run `npm start` (or use PM2 for production). --- ## 🔐 Admin Features (Optional Quick Add) Add a simple admin route to manage users and pets: ### `routes/admin.js` ```js const express = require('express'); const router = express.Router(); const db = require('../database'); const ensureAdmin = require('../middleware/adminAuth'); router.get('/', ensureAdmin, (req, res) => { db.all('SELECT * FROM users', (err, users) => { db.all('SELECT * FROM pets', (err2, pets) => { res.render('admin/dashboard', { users, pets, title: 'Admin' }); }); }); }); module.exports = router; ``` Create `views/admin/dashboard.hbs` as needed. --- ## 💡 Next Steps & Customization - Add **payment gateway** (Stripe/PayPal) for deposit/withdrawal instead of flat wallet. - Add **pet categories**, **reviews**, **lost & found** (as in the search results). - Use **Redis** for real-time balance updates. - Switch to PostgreSQL by changing the `database.js` driver (Prisma optional). You now have a fully working **PetStore P2P** platform with: - 📝 User registration/login - 🐕 Pet listing & management - 🛒 Store purchase (buyer → wallet → seller) - 💸 P2P money transfers between users - 💬 Real-time chat with Socket.io - 📦 Order history Just run `npm start` and start adding pets! 🎉