Kanak-internship

app.js

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+const express = require('express');
+const { MongoClient } = require('mongodb');
+const app = express();
+const port = 3000;
+
+// MongoDB URI and Database details
+const uri = "mongodb://localhost:27017";  // Assuming MongoDB is running locally
+const dbName = "companiesDB";
+let db, companiesCollection;
+
+// Connect to MongoDB
+MongoClient.connect(uri, { useNewUrlParser: true, useUnifiedTopology: true })
+  .then(client => {
+    console.log("Connected to MongoDB");
+    db = client.db(dbName);
+    companiesCollection = db.collection("companies");
+  })
+  .catch(err => console.error("Failed to connect to MongoDB:", err));
+
+// Middleware to serve static files
+app.use(express.static('public'));
+
+// Routes for performing queries
+
+// Query 1: All companies whose name matches 'Babelgum'
+app.get('/companies/babelgum', async (req, res) => {
+  try {
+    const query = { name: "Babelgum" };
+    const projection = { name: 1 };
+    const companies = await companiesCollection.find(query).project(projection).toArray();
+    res.json(companies);
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to fetch data' });
+  }
+});
+
+// Query 2: Companies with more than 5000 employees (Limit: 20, Sort by employees)
+app.get('/companies/employees-more-than-5000', async (req, res) => {
+  try {
+    const query = { number_of_employees: { $gt: 5000 } };
+    const companies = await companiesCollection.find(query)
+      .sort({ number_of_employees: 1 })
+      .limit(20)
+      .toArray();
+    res.json(companies);
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to fetch data' });
+  }
+});
+
+// Query 3: Companies founded between 2000 and 2005 (Include only name and founded year)
+app.get('/companies/founded-2000-2005', async (req, res) => {
+  try {
+    const query = { founded_year: { $gte: 2000, $lte: 2005 } };
+    const projection = { name: 1, founded_year: 1 };
+    const companies = await companiesCollection.find(query).project(projection).toArray();
+    res.json(companies);
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to fetch data' });
+  }
+});
+
+// Query 4: Companies with IPO valuation more than 100,000,000 and founded before 2010
+app.get('/companies/ipo-more-than-100m', async (req, res) => {
+  try {
+    const query = { "ipo.valuation_amount": { $gt: 100000000 }, "founded_year": { $lt: 2010 } };
+    const projection = { name: 1, ipo: 1 };
+    const companies = await companiesCollection.find(query).project(projection).toArray();
+    res.json(companies);
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to fetch data' });
+  }
+});
+
+// Query 5: Companies with less than 1000 employees and founded before 2005 (Sort by number of employees, Limit 10)
+app.get('/companies/employees-less-than-1000', async (req, res) => {
+  try {
+    const query = { number_of_employees: { $lt: 1000 }, founded_year: { $lt: 2005 } };
+    const companies = await companiesCollection.find(query)
+      .sort({ number_of_employees: 1 })
+      .limit(10)
+      .toArray();
+    res.json(companies);
+  } catch (err) {
+    res.status(500).json({ error: 'Failed to fetch data' });
+  }
+});
+
+// More queries can be added here as needed...
+
+// Start the server
+app.listen(port, () => {
+  console.log(`Server running at http://localhost:${port}`);
+});