**Course Title:** Mastering Node.js: Building Scalable Web Applications **Section Title:** Managing Data with MongoDB and Mongoose **Topic:** Setting up MongoDB and Mongoose in Node.js **Objective:** By the end of this topic, you will be able to set up MongoDB and Mongoose in your Node.js application, understand the basics of MongoDB and Mongoose, and be able to connect to MongoDB database using Mongoose. **Prerequisites:** - Basic understanding of Node.js and its ecosystem - Familiarity with Express.js - Introduction to NoSQL databases and MongoDB **What is MongoDB?** MongoDB is a NoSQL, document-based database that stores data in JSON-like documents. It is a popular choice for modern web applications due to its flexibility, scalability, and high performance. **What is Mongoose?** Mongoose is a popular Object Data Modeling (ODM) library for MongoDB and Node.js. It provides a simple and intuitive way to interact with MongoDB databases, allowing you to define models, schemas, and relationships between data. **Setting up MongoDB:** 1. **Download and Install MongoDB:** You can download MongoDB from the official MongoDB website: <https://www.mongodb.com/try/download/community>. Follow the installation instructions for your operating system. 2. **Start the MongoDB Server:** Once installed, start the MongoDB server by running the command `mongod` in your terminal. 3. **Create a MongoDB Database:** Create a new database in MongoDB using the `use` command in the MongoDB shell. For example: `use mydatabase`. **Setting up Mongoose:** 1. **Install Mongoose:** Install Mongoose using npm by running the command `npm install mongoose`. 2. **Import Mongoose:** Import Mongoose in your Node.js application using the `require` function: `const mongoose = require('mongoose');`. 3. **Connect to MongoDB:** Connect to your MongoDB database using Mongoose by calling the `connect` method: `mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });`. **Example Code:** ```javascript // Import Mongoose const mongoose = require('mongoose'); // Connect to MongoDB mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true }); // Define a schema for a user document const userSchema = new mongoose.Schema({ name: String, email: String }); // Create a model from the schema const User = mongoose.model('User', userSchema); // Create a new user document const user = new User({ name: 'John Doe', email: 'johndoe@example.com' }); // Save the user document to the database user.save((err, user) => { if (err) { console.error(err); } else { console.log('User saved successfully!'); } }); ``` **Key Concepts:** * MongoDB is a NoSQL, document-based database that stores data in JSON-like documents. * Mongoose is an ODM library for MongoDB and Node.js that provides a simple and intuitive way to interact with MongoDB databases. * To set up MongoDB, download and install the MongoDB server, start the server, and create a new database. * To set up Mongoose, install the Mongoose library, import Mongoose in your Node.js application, and connect to your MongoDB database using Mongoose. **Practical Takeaways:** * Use Mongoose to interact with your MongoDB database in your Node.js application. * Define schemas and models using Mongoose to structure your data. * Use the `connect` method to connect to your MongoDB database using Mongoose. **What's Next:** In the next topic, we will cover defining schemas and models with Mongoose.