Professional JavaScript (Node.js): Advanced Techniques

This book is not another introduction to JavaScript. It is intended for those who already write confidently in Node.js but want to move to the next level: design fault-tolerant systems, work with data streams, and build high-load server applications.

What this book is about

You will dive into the depths of the Node.js platform and V8. The book covers four key areas:

• Asynchronous Programming: from advanced patterns (async/await, Promises) to working with EventEmitter and Streams.
• Architecture and Performance: clustering, load balancing, caching, profiling, and memory optimization.
• Security: protection against OWASP Top 10, working with JWT, OAuth2, encryption, and secure secret storage.
• Microservices and Infrastructure: designing REST API and GraphQL, working with Docker, Kubernetes, queues (RabbitMQ, Redis), and logs.

Who this book is for

• JavaScript developers with at least 1 year of experience who want to become Senior or Team Lead developers.
• Backend engineers transitioning to Node.js from other languages (Python, PHP, Java).
• DevOps engineers who need to understand the internal workings of Node applications for deployment and monitoring.

What you will learn

• How the Event Loop actually works and how to avoid "blocking the loop".
• How to design scalable applications using clusters and worker_threads.
• How to set up monitoring and alerting (Prometheus, Grafana) for Node.js.
• How to write tests (Unit, Integration, E2E) using Jest, Mocha, and Supertest.
• How to implement CI/CD pipelines for Node.js projects.

Why you should read it

The book is built on real production cases. Each chapter contains not only theory but also ready-made code examples that can be immediately applied to your project. This is not a reference guide, but a practical manual for those who want to write efficient, secure, and maintainable code in Node.js.

After reading, you will be able to confidently design microservice architecture, optimize performance, and avoid common mistakes that even experienced developers make.