Overview

Imagine this scenario: You launch a new startup. The MVP is simple-just a few routes in Express.js. It works perfectly. But then, the product succeeds. You add fifty new features. You hire ten new developers. Suddenly, that simple codebase becomes a nightmare. Files are scattered everywhere. One developer puts logic in the controller; another puts it in a helper function. You are scared to update the database schema because you don't know what might break. When a bug appears in production, it takes hours to trace because the logs are a mess. I have been there. It is stressful, and it kills productivity. Now, imagine a different reality. You open a project with hundreds of files, but you know exactly where everything is. You need to add a feature? You create a Module. You need to validate data? You add a DTO. You need to process a heavy file? You dispatch a Job to a queue. This is the peace of mind that NestJS brings. It turns the chaos of backend development into a predictable, organized engineering process. This book is your ticket to that reality. What's insideI have structured this book to mirror the lifecycle of a real-world project. We start with the core philosophy and end with a production deployment. Here is a glimpse of what you will master: The Architecture of Control: Understand how the Inversion of Control (IoC) container works and how to use the Module pattern to keep your code loosely coupled. Data Persistence: Move beyond raw SQL. Learn to use TypeORM to manage relationships, transactions, and migrations, while ensuring data integrity with DTOs and validation pipelines. Iron-Clad Security: Implement JWT authentication, Role-Based Access Control (RBAC), and Policy-Based Authorization to ensure only the right people access the right data. Aspect-Oriented Programming: Stop repeating code. Learn to use Interceptors, Guards, and Pipes to handle cross-cutting concerns like logging and error handling globally. Asynchronous Power: Offload CPU-intensive tasks to background queues using BullMQ and Redis, and schedule recurring cron jobs without blocking your main server. Testing Strategies: Stop hoping your code works. Learn to write Unit, Integration, and End-to-End (E2E) tests that verify every layer of your stack. Scaling Out: Learn exactly when to break your monolith. Build high-performance microservices using TCP, RabbitMQ, and gRPC. DevOps & Deployment: Dockerize your application, set up CI/CD pipelines, and manage production processes with PM2. Who it's meant forThis book is written for developers who are ready to level up. Node.js Developers who are tired of unstructured code and want to learn enterprise architecture. Frontend Developers (especially Angular users) who want to use their existing knowledge to become full-stack engineers. Backend Engineers coming from Java or C# who want to apply strict design patterns to the JavaScript ecosystem. Technical Leads looking for a standard framework to scale their teams and codebase efficiently. You can keep building applications that are fragile and hard to maintain, or you can decide today to become an architect of scalable systems. The demand for robust, TypeScript-based backend engineering is higher than ever. Do not just learn a framework-master the architecture that powers the modern web. Grab your copy of ""Mastering NestJS"" today and start building the backend of the future.

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