How to perform CRUD operations with MongoDB in Node.js



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Performing CRUD (Create, Read, Update, Delete) operations with MongoDB in Node.js involves using the official MongoDB Node.js driver or an ODM (Object-Document Mapper) like Mongoose. Here's a basic guide using the MongoDB driver:

1. Install MongoDB Node.js Driver

bash
npm install mongodb

2. Set up Connection

javascript
const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017'; // MongoDB connection string
const dbName = 'your_database_name';

// Use MongoClient to connect to the server
MongoClient.connect(url, { useNewUrlParser: true, useUnifiedTopology: true }, (err, client) => {
  if (err) {
    console.error('Error connecting to MongoDB:', err);
    return;
  }

  console.log('Connected to MongoDB');
  const db = client.db(dbName);

  // Perform CRUD operations here

  // Close the connection
  client.close();
});

3. Create Operation (Insert)

javascript
const collection = db.collection('your_collection_name');

// Insert one document
collection.insertOne({ key: 'value' }, (err, result) => {
  if (err) {
    console.error('Error inserting document:', err);
    return;
  }

  console.log('Document inserted:', result.insertedId);
});

4. Read Operation (Find)

javascript
// Find documents
collection.find({ key: 'value' }).toArray((err, documents) => {
  if (err) {
    console.error('Error finding documents:', err);
    return;
  }

  console.log('Found documents:', documents);
});

5. Update Operation

javascript
// Update one document
collection.updateOne({ key: 'value' }, { $set: { key: 'new_value' } }, (err, result) => {
  if (err) {
    console.error('Error updating document:', err);
    return;
  }

  console.log('Document updated:', result.modifiedCount);
});

6. Delete Operation

javascript
// Delete one document
collection.deleteOne({ key: 'new_value' }, (err, result) => {
  if (err) {
    console.error('Error deleting document:', err);
    return;
  }

  console.log('Document deleted:', result.deletedCount);
});

Replace 'your_database_name' and 'your_collection_name' with your actual database and collection names. Adjust the data and queries based on your specific use case.

Note: It's recommended to use environment variables for sensitive information like connection strings and credentials. Additionally, consider error handling and other best practices for production code.

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