MongoDB Basics

MongoDB is a popular NoSQL database that provides a flexible and scalable solution for storing and managing data. Unlike traditional relational databases like MySQL, MongoDB stores data in a flexible, JSON-like format called BSON (Binary JSON).

To work with MongoDB in a Node.js application, you can use an Object Data Modeling (ODM) library like Mongoose. Mongoose provides a simple and elegant way to define schemas and models, and perform CRUD operations on MongoDB.

Here's an example of connecting to a MongoDB database using Mongoose in a Node.js application:

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In this example, we import the mongoose module and connect to a MongoDB database running locally on port 27017. The connection URL mongodb://localhost/mydatabase specifies the URL of the MongoDB server and the name of the database.

Once connected, you can perform various operations such as creating documents, querying data, updating documents, and deleting documents using the Mongoose API.

MongoDB offers many advantages over traditional relational databases, including scalability, flexible data structure, and support for distributed systems. It is widely used in modern web applications and is a key component of the MERN (MongoDB, Express.js, React, Node.js) stack.

It's important to note that this is just a basic introduction to MongoDB. There are many more concepts to explore, such as indexing, aggregation, data replication, and sharding.

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const mongoose = require('mongoose');

​

// Connect to MongoDB

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })

  .then(() => {

    console.log('Connected to MongoDB');

  })

  .catch((error) => {

    console.error('Error connecting to MongoDB', error);

  });