Udemy – Mastering Node.js: From Beginner to Backend Pro

1. NodeJS Architecture

• Event-Driven Architecture: Understanding how NodeJS handles asynchronous operations using an event loop.
• Single Threaded Nature: Learn how NodeJS manages multiple tasks concurrently despite being single-threaded.
• Non-blocking I/O: How NodeJS uses non-blocking I/O operations to handle multiple requests efficiently.

2. Core Modules

• HTTP Module: Creating HTTP servers, handling requests and responses.
• File System (fs) Module: Reading and writing files, managing directories.
• Path Module: Working with file and directory paths.
• Events Module: Creating and handling custom events.
• Stream Module: Handling large data sets by processing data in chunks.
• OS Module: Interacting with the operating system, gathering system information.
• Util Module: Utility functions, including deprecating methods and debugging.

3. npm (Node Package Manager)

• Package Management: Installing, updating, and removing packages.
• Creating and Publishing Packages: Building your own NodeJS packages and publishing them to npm.
• Semantic Versioning: Understanding versioning in npm and how to use it.

4. Asynchronous Programming

• Callbacks: The foundation of async programming in NodeJS.
• Promises: Handling asynchronous operations more elegantly with .then() and .catch().
• Async/Await: Writing asynchronous code that looks synchronous for better readability.
• Event Loop: In-depth understanding of how the event loop processes asynchronous callbacks.
• Timers: Using setTimeout, setInterval, and setImmediate.

5. Express.js Framework

• Setting Up a Server: Creating a basic server with Express.
• Routing: Defining routes for handling HTTP requests.
• Middleware: Implementing and understanding the role of middleware in request processing.
• Error Handling: Centralized error handling in Express applications.
• Template Engines: Using engines like EJS, Pug, or Handlebars to render dynamic content.

6. Web APIs and RESTful Services

• Creating REST APIs: Building RESTful services with Express.js or other frameworks.
• CRUD Operations: Implementing Create, Read, Update, Delete operations in your API.
• Authentication: Securing APIs with JWT (JSON Web Tokens), OAuth, or other authentication methods.
• API Documentation: Using tools like Swagger to document your API.

7. Database Integration

• SQL Databases: Using libraries like pg for PostgreSQL or mysql2 for MySQL.
• NoSQL Databases: Integrating with MongoDB using Mongoose.
• ORMs: Working with ORMs like Sequelize for SQL databases.
• Database Migrations: Managing database schema changes with migration tools.

8. Real-time Applications

• WebSockets: Using libraries like socketIO to build real-time applications like chat apps.
• Server-Sent Events (SSE): Implementing unidirectional server-to-client updates.
• Polling: Understanding long polling as an alternative to WebSockets.

9. Security

• Data Validation: Ensuring incoming data is valid and secure using libraries like Joi.
• Input Sanitization: Preventing injection attacks by sanitizing input.
• Authentication and Authorization: Implementing secure authentication mechanisms.
• HTTPS: Securing your NodeJS server with HTTPS.
• Rate Limiting: Protecting your APIs from brute-force attacks with rate limiting.

10. Testing

• Unit Testing: Writing tests for individual units of code using frameworks like Mocha, Jest, or Jasmine.
• Integration Testing: Testing the interaction between different parts of your application.
• Test-Driven Development (TDD): Writing tests before code to ensure functionality.
• Mocking and Stubbing: Simulating external services or functions in tests.

11. Deployment and Scaling

• Environment Management: Using .env files and environment variables for configuration.
• Process Management: Using PM2 or forever to manage NodeJS processes in production.
• Load Balancing: Distributing traffic across multiple instances of your application.
• Scaling: Horizontal and vertical scaling techniques for NodeJS applications.
• Containerization: Using Docker to containerize your NodeJS application.
• CI/CD Pipelines: Automating the deployment process using tools like Jenkins, GitHub Actions, or CircleCI.

12. Working with Streams and Buffers

• Readable and Writable Streams: Understanding how to process data piece by piece.
• Pipes: Connecting streams together to pass data from one stream to another.
• Transform Streams: Manipulating data as it is read or written.
• Buffers: Handling binary data directly in NodeJS.

13. Error Handling and Debugging

• Error Handling Best Practices: Using try…catch and centralized error handling middleware.
• Logging: Implementing logging using libraries like Winston or Bunyan.
• Debugging: Using NodeJS built-in debugger or Chrome DevTools for debugging.

14. Build Tools and Task Runners

• Gulp: Automating tasks like minification, compilation, and linting.
• Webpack: Module bundler for handling project assets.
• ESLint: Enforcing coding standards and style guidelines.

15. Microservices and API Gateways

• Microservice Architecture: Designing and implementing microservices with NodeJS.
• API Gateway: Managing multiple microservices behind a unified interface using tools like YARP or NGINX.
• Inter-service Communication: Using protocols like HTTP, gRPC, or message queues.

16. Performance Optimization

• Profiling: Using tools like NodeJS Profiler and Clinic.js to identify performance bottlenecks.
• Caching: Implementing caching strategies with Redis or in-memory caches.
• Clustering: Utilizing NodeJS’s clustering module to take advantage of multi-core systems.

17. Advanced Topics

• Child Processes: Running multiple processes from a single NodeJS script.
• Worker Threads: Leveraging multi-threading in NodeJS for CPU-intensive tasks.
• Serverless: Deploying NodeJS applications in a serverless architecture using AWS Lambda, Google Cloud Functions, etc.