JavaScript (Node.js): Tips and Best Practices

This book is your practical guide to professional Node.js development. It's not about basic syntax, but about how to write code that is easy to maintain, scale, and debug. You will learn how to avoid common pitfalls, use modern language features, and build a reliable server application architecture.

The book is divided into logical blocks, each solving a specific developer task:

• Environment and Tools: project setup, package manager selection, linters and formatters, TypeScript configuration in Node.js.
• Asynchrony and Performance: deep dive into promises, async/await, EventEmitter, streams, and clustering.
• Security: protection against OWASP Top 10, handling secrets, input validation, safe work with databases and files.
• Testing and Debugging: unit tests, integration tests, mock objects, profiling, and memory leak detection.
• Production Mode: logging, monitoring, Graceful Shutdown, working with PM2 and Docker, CI/CD pipelines.

Who is this book for?

• Junior developers who have already mastered the basics of Node.js and want to move to the next level.
• Middle developers looking to systematize their knowledge and learn industry-best practices.
• Developers from other languages (Python, PHP, Java) transitioning to the JavaScript world and wanting to avoid beginner mistakes.

What you will learn after reading:

• How to organize code so that it is easy to refactor and test.
• Which design patterns actually work in Node.js (Middleware, Repository, Observer).
• How to properly handle errors without losing context.
• How to build high-load systems using worker_threads and clustering.
• How to write secure code resistant to attacks.

Each chapter contains code examples ready for use in real projects and links to additional resources. The book is written in a lively language, without fluff — only what you will need at work tomorrow.

If you want to stop writing "just anyhow" and start writing "like a professional" — this book is for you.