Linjanja Scalable Application Development with NestJS

Leverage REST, GraphQL, microservices, testing, and deployment for seamless growth
1. Auflage 2025
ISBN: 978-1-83546-395-6
Verlag: De Gruyter
Format: EPUB
Kopierschutz: 0 - No protection

E-Book, Englisch, 614 Seiten

In this book, Pacifique Linjanja, a globally recognized software engineer and open-source contributor, shares his deep technical expertise and practical insights from his extensive experience delivering enterprise-level applications to unpack the full potential of NestJS, the cutting-edge Node.js framework.
This book covers the core concepts, design patterns, and best practices for building scalable, high-performance applications with NestJS. You'll learn REST API and GraphQL implementations, harness the power of microservices, and explore real-world case studies, including e-commerce, social networking, and ERP systems. The chapters provide step-by-step guidance for setting up your development environment with TypeScript and npm, structuring projects effectively, and using the Apollo Federation architecture to create efficient GraphQL APIs. This book offers hands-on guidance for testing and debugging APIs, handling exceptions, and validating data using pipes and guards, all while helping you build a complete NestJS application from scratch.
By the end, you'll be ready to apply DevOps principles for continuous integration and deployment, as well as secure your NestJS applications using advanced techniques.
*Email sign-up and proof of purchase required

Autoren/Hrsg.

Linjanja, Pacifique

Fachgebiete

• Mathematik | Informatik EDV | Informatik EDV & Informatik Allgemein

Leseproben

Table of Contents

Preface

Free Benefits with Your Book

Part 1: Introduction to NestJS and Scalable Application Architecture

1

Overview of NestJS

Technical requirements

Introduction to NestJS

Historical context

Problem statement – the need for NestJS

NestJS versus other frameworks – a comparative analysis

Key advantages of using NestJS

The power of TypeScript

Why TypeScript?

The value proposition – what does TypeScript offer?

Code snippet – TypeScript in action

TypeScript and NestJS – a perfect synergy

Code snippet – NestJS with TypeScript

Key features of NestJS

Modularity

Dependency injection

Decorators

Guards

Exception filters

Pipes

Interceptors

The ecosystem of NestJS

Third-party modules

Nest CLI

Community support

Why choose NestJS?

Summary

2

Understanding Scalable Application Architecture Principles and Design Patterns

Technical requirements

Principles of Scalable Application Architecture

Your app as a growing city

The three Ss of scalability

The importance of modular design – a double-edged sword

Statelessness – the cornerstone of horizontal scaling

Database scalability – sharding, replication, and partitioning

The social network of microservices – event-driven architecture

Load balancing and horizontal scaling

Caching strategies for performance optimization

Types of caching – knowing your tools

The ABCs of caching strategies

Caching in the NestJS universe

Design patterns for building scalable NestJS applications

Why design patterns matter

The singleton pattern for managing global state

The factory pattern for object creation

Dependency injection for loose coupling

The decorator pattern for extending functionality in NestJS

Why decorators make NestJS outstanding

Understanding asynchronous programming for scalability

What is asynchronous programming?

Why asynchrony is important for scalability

Improved user experience

Asynchronous programming in NestJS

Event loop and non-blocking I/O

Best practices for building scalable applications

Code organization is key

Optimizing data storage and retrieval

Embracing microservices for decoupling

Automating testing and deployment

Making use of middleware and interceptors

Don’t neglect security

Leveraging load balancing

Using application metrics for insights

Summary

3

Setting Up Your NestJS Environment and Exploring NestJS – Building a Robust App

Technical requirements

Installing Node.js and NestJS

Step 1 – Install Node.js

Step 2 – Install the NestJS CLI

Scaffolding a new NestJS project

Creating a new NestJS project

The birth of a NestJS project

Understanding the NestJS project structure

Why is NestJS’s project structure important?

The src/ directory

The dist/ directory

The node_modules/ directory

The test/ directory

Configuration files – tsconfig.json and nest-cli.json

Creating and managing modules

What are modules in NestJS?

The role of the root module

Creating a new module

Managing modules

Building controllers for handling requests

What is a controller in NestJS?

Crafting your first controller

Handling requests with decorators

Dynamic routes and parameters

Implementing providers for business logic

What is a provider in NestJS?

Crafting your first provider

Dependency injection – the magic behind providers

Custom providers – beyond classes

Handling exceptions with exception filters

What are exception filters?

Crafting a basic exception filter

Validating data with pipes and guards

Pipes – transforming and validating

Guards – protecting routes

Summary

4

Advanced Concepts – Modules, Controllers, Providers, Exception Filters, Pipes, Guards, and Decorators

Technical requirements

Diving deeper into modules

The essence of modular thinking

Why it’s more than just organization

The fundamental role of modules in NestJS

Creating and initializing a module

The application module graph

Sharing modules across the application

Modular organization for large-scale applications

NestJS controller essentials and advanced practices

Creating your first controller

Basic routing in controllers

Parameterized routes

Scaling your controllers

Refined request handling

Advanced Data Transfer Objects and validation pipelines

Response transformation – interceptors in action

Middleware – the uncelebrated controller companions

Deep dive into route guards

Streaming data with NestJS controllers

Advanced WebSocket patterns

Understanding providers in depth

Brief recap – providers and modules

What constitutes a provider in NestJS?

Injecting providers into modules, controllers, and other providers

Custom providers

Asynchronous providers

Exporting providers from modules

Enhancers as a special kind of provider

Advanced techniques and best practices

Understanding request lifecycle

Summary

Part 2: REST APIs and GraphQL in NestJS

5

Building and Optimizing REST APIs with NestJS

Technical requirements

Introduction to REST APIs in NestJS

Building a basic REST API

Setting up your REST API project

Designing your first RESTful endpoint

Integrating advanced concepts into your API

Reflecting on REST API best practices

Versioning your API

Context for v2

Introduction to API versioning concepts

Setting up the version 2 infrastructure

Robust error handling in REST APIs

Understanding error handling

Key aspects of robust error handling

Implementing error handling in the user management API

Best practices for client-friendly errors

Documenting your API

The importance of API documentation

Key components of effective API documentation

Implementing documentation in the user management API

Adding Swagger annotations to DTOs and entities

Setting up Swagger in the controller

Generating Swagger documentation

Keeping documentation up to date

Example – complete user management API Swagger documentation

Best practices for maintaining API documentation

Summary

6

Unleashing the Power of GraphQL and the Apollo Federation Architecture in NestJS

Technical requirements

Understanding GraphQL fundamentals in NestJS

What is GraphQL?

GraphQL and NestJS – a perfect match

Advantages of using GraphQL with NestJS

Big companies using GraphQL in production

Building and optimizing a GraphQL API with NestJS

Contextualizing our application

Two approaches to GraphQL with NestJS

Code-first approach

Schema-first approach

Learning about GraphQL subscriptions

Implementing and testing subscriptions in NestJS

Securing GraphQL – authentication and authorization

Understanding the...

Über Autor(innen)

Linjanja Pacifique :

Pacifique Linjanja is a skilled software engineer known for building enterprise-level applications with technologies such as NestJS. He has led diverse development teams globally, delivering scalable, efficient software solutions across multiple projects. In addition to his work, Pacifique actively contributes to open source communities, sharing his expertise and insights through technical talks and coding workshops. He enjoys mentoring new developers and continues to broaden his knowledge by exploring various fields beyond technology, believing in the importance of learning and giving back to the tech community.