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Dockerfile

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+# Use official Node.js image
+FROM node:18
+
+# Create app directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy source code
+COPY . .
+
+# Expose the port Hugging Face expects (7860)
+EXPOSE 7860
+
+# Define environment variable for port
+ENV PORT=7860
+
+# Start the app
+CMD [ "npm", "start" ]

index.js

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+require('dotenv').config();
+const express = require('express');
+const mongoose = require('mongoose');
+const cors = require('cors');
+const helmet = require('helmet');
+const Analytics = require('./models/Analytics');
+
+const app = express();
+const PORT = process.env.PORT || 7860; // 7860 is the default for HuggingFace Spaces
+
+// --- Middleware ---
+app.use(helmet()); // Adds security headers
+app.use(express.json()); // Parses JSON body
+// In production, replace '*' with your frontend domain (e.g., 'https://comprex.pages.dev')
+app.use(cors({ origin: '*' })); 
+
+// --- Database Connection ---
+const connectDB = async () => {
+  try {
+    // We use the MONGO_URI from .env
+    await mongoose.connect(process.env.MONGO_URI);
+    console.log('✅ MongoDB Connected Successfully');
+  } catch (err) {
+    console.error('❌ MongoDB Connection Error:', err);
+    process.exit(1); // Exit if DB fails
+  }
+};
+connectDB();
+
+// --- Routes ---
+
+// 1. Health Check
+app.get('/', (req, res) => {
+  res.json({ status: 'active', message: 'CompreX Backend is running' });
+});
+
+// 2. Track Compression (Frontend calls this after compressing a file)
+app.post('/api/track', async (req, res) => {
+  try {
+    const { fileType, originalSize, compressedSize } = req.body;
+
+    // Basic Validation
+    if (!fileType || !originalSize || !compressedSize) {
+      return res.status(400).json({ error: 'Missing required fields' });
+    }
+
+    const newStat = await Analytics.create({
+      fileType,
+      originalSize,
+      compressedSize
+    });
+
+    res.status(201).json({ success: true, id: newStat._id });
+  } catch (error) {
+    console.error('Tracking Error:', error);
+    res.status(500).json({ error: 'Server Error' });
+  }
+});
+
+// 3. Get Dashboard Stats (For the Analytics Page)
+app.get('/api/stats', async (req, res) => {
+  try {
+    // Aggregation Pipeline for Performance
+    const stats = await Analytics.aggregate([
+      {
+        $group: {
+          _id: null,
+          totalFiles: { $sum: 1 },
+          totalOriginal: { $sum: "$originalSize" },
+          totalCompressed: { $sum: "$compressedSize" }
+        }
+      }
+    ]);
+
+    // Get Daily Activity for the last 7 days (For the Chart)
+    const sevenDaysAgo = new Date();
+    sevenDaysAgo.setDate(sevenDaysAgo.getDate() - 7);
+
+    const history = await Analytics.aggregate([
+      { $match: { timestamp: { $gte: sevenDaysAgo } } },
+      {
+        $group: {
+          _id: { $dateToString: { format: "%Y-%m-%d", date: "$timestamp" } },
+          count: { $sum: 1 },
+          savedBytes: { $sum: { $subtract: ["$originalSize", "$compressedSize"] } }
+        }
+      },
+      { $sort: { _id: 1 } } // Sort by date ascending
+    ]);
+
+    const globalStats = stats[0] || { totalFiles: 0, totalOriginal: 0, totalCompressed: 0 };
+    const totalSaved = globalStats.totalOriginal - globalStats.totalCompressed;
+
+    res.json({
+      totalFiles: globalStats.totalFiles,
+      totalSavedBytes: totalSaved,
+      history
+    });
+
+  } catch (error) {
+    console.error('Stats Error:', error);
+    res.status(500).json({ error: 'Server Error' });
+  }
+});
+
+// --- Start Server ---
+app.listen(PORT, () => {
+  console.log(`🚀 Server running on port ${PORT}`);
+});

models/Analytics.js

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+const mongoose = require('mongoose');
+
+const AnalyticsSchema = new mongoose.Schema({
+  fileType: {
+    type: String,
+    required: true,
+    enum: ['image', 'video', 'pdf', 'audio'], // Restrict to known types
+  },
+  originalSize: {
+    type: Number, // in bytes
+    required: true,
+  },
+  compressedSize: {
+    type: Number, // in bytes
+    required: true,
+  },
+  timestamp: {
+    type: Date,
+    default: Date.now,
+    index: true // Indexing makes dashboard queries faster
+  }
+});
+
+module.exports = mongoose.model('Analytics', AnalyticsSchema);

package.json

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+{
+  "name": "backend",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^17.2.3",
+    "express": "^5.1.0",
+    "helmet": "^8.1.0",
+    "mongoose": "^9.0.0"
+  }
+}