JavaScript (Node.js): Tips and Best Practices

The book "JavaScript (Node.js): Tips and Best Practices" is a concentrated experience of a professional developer that will help you avoid common mistakes and write clean, performant, and secure Node.js code. Unlike academic textbooks, this book is built around real-world tasks and their effective solutions.

What is this book about?

You won't find a retelling of the documentation here. Instead, you'll get over 30 proven recipes for everyday work:

• Organizing project structure and modules (from monolith to microservices).
• Working with asynchrony: promises, async/await, error handling in chains.
• Performance optimization: clustering, caching, memory management.
• Security: protection against XSS, CSRF, SQL injections, input validation.
• Working with databases (MongoDB, PostgreSQL) and ORM/ODM.
• Design patterns: Middleware, Observer, Singleton, Factory.
• Testing: unit tests, integration tests, mock objects.
• Deployment and DevOps: Docker, CI/CD, monitoring and logging.

Who is this book for?

• Junior developers who have already mastered the basics of JavaScript and want to move on to professional Node.js development.
• Middle developers seeking to systematize their knowledge and learn advanced techniques.
• Backend developers in other languages who are transitioning to Node.js and want to quickly integrate into the ecosystem.
• Team leads and architects who want to implement best practices in their projects.

What will you learn after reading?

• How to properly organize code so that it scales and is easy to maintain.
• How to avoid "callback hell" and handle errors correctly.
• How to optimize a Node.js application for high loads.
• How to protect your application from common vulnerabilities.
• How to set up the development and deployment process "out of the box".
• How to write tests that actually catch bugs.

Each chapter contains practical code examples ready for use in real projects. All examples are available in a GitHub repository. The book is written in a lively, accessible language — without unnecessary fluff or abstract reasoning.

If you want to stop googling the same problems and start writing code you can be proud of — this book is for you.