10 Best MongoDB Projects

// Personal Contact Manager - MongoDB CRUD Operations
// Prerequisites: MongoDB running locally, Node.js with mongodb driver installed
// Run: npm install mongodb

const { MongoClient } = require('mongodb');

const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri);

async function main() {
  try {
    await client.connect();
    console.log('Connected to MongoDB');
    
    const db = client.db('contactManager');
    const contacts = db.collection('contacts');
    
    // Clear existing data for demo
    await contacts.deleteMany({});
    
    // CREATE - Insert contacts
    const insertResult = await contacts.insertMany([
      { name: 'John Doe', phone: '555-1234', email: 'john@example.com' },
      { name: 'Jane Smith', phone: '555-5678', email: 'jane@example.com' },
      { name: 'Bob Johnson', phone: '555-9012', email: 'bob@example.com' }
    ]);
    console.log('\nInserted contacts:', insertResult.insertedCount);
    
    // READ - Find all contacts
    console.log('\nAll Contacts:');
    const allContacts = await contacts.find({}).toArray();
    allContacts.forEach(c => console.log(`  ${c.name} - ${c.phone} - ${c.email}`));
    
    // READ - Find specific contact
    console.log('\nFind contact named "Jane Smith":');
    const jane = await contacts.findOne({ name: 'Jane Smith' });
    console.log(`  ${jane.name} - ${jane.phone}`);
    
    // UPDATE - Update contact phone number
    const updateResult = await contacts.updateOne(
      { name: 'John Doe' },
      { $set: { phone: '555-9999' } }
    );
    console.log('\nUpdated John\'s phone. Modified count:', updateResult.modifiedCount);
    
    // Verify update
    const updatedJohn = await contacts.findOne({ name: 'John Doe' });
    console.log(`  Updated: ${updatedJohn.name} - ${updatedJohn.phone}`);
    
    // DELETE - Remove a contact
    const deleteResult = await contacts.deleteOne({ name: 'Bob Johnson' });
    console.log('\nDeleted Bob. Deleted count:', deleteResult.deletedCount);
    
    // Final count
    const finalCount = await contacts.countDocuments();
    console.log('\nFinal contact count:', finalCount);
    
  } finally {
    await client.close();
    console.log('\nConnection closed');
  }
}

main().catch(console.error);