TOPIC OVERVIEW

NestJS/Architecture

Understand how NestJS pieces fit together to build a backend that can grow without becoming a mess.

18 QuestionsAdvancedHigh Priority ~13 min read

NestJS encourages a modular architecture where responsibilities are separated into controllers, providers, modules, and other framework components. This gives teams a consistent way to organize large backend applications.

A well-designed NestJS application separates HTTP handling, business logic, data access, authentication, and infrastructure concerns. Understanding this architecture helps you make better design decisions instead of simply putting every piece of logic inside controllers and services.

What you'll walk away knowing

How the major NestJS building blocks fit together

How to separate controllers, business logic, and data access

How feature-based modules improve scalability

How to structure a production-ready NestJS application

1How does NestJS achieve platform agnosticism between Express and Fastify?Intermediate 2How does NestJS handle module initialization order and can you control it?Intermediate 3What is the difference between app.use() and NestJS middleware?Intermediate 4How does NestJS resolve a provider when the same token is exported by two different imported modules?Intermediate 5How does the NestJS bootstrap sequence work?Intermediate 6What is the difference between a service and a repository in NestJS?Intermediate 7What is the difference between a monorepo and a standard NestJS project structure?Intermediate 8How do you implement a plugin system using dynamic modules in NestJS?Advanced 9How do you unit-test a module that uses a dynamic module dependency in NestJS?Intermediate 10What is a barrel module in NestJS and when does it become an anti-pattern?Intermediate 11What is the APP_GUARD / APP_PIPE token pattern in NestJS?Intermediate 12How do you apply global middleware, pipes, guards, or interceptors in NestJS?Intermediate

All Topics

1

Dependency Injection

2

Request Lifecycle

Exception Handling

3

4

Database and ORM

5

Authentication and Authorization

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