Feature modules in NestJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a feature module in NestJS?

A feature module is a module that groups related components, services, and controllers to organize code by functionality. It helps keep the app modular and easier to maintain.

beginner

How do feature modules improve a NestJS application?

They separate concerns by grouping related code, making the app easier to understand, test, and scale. They also enable lazy loading and better dependency management.

beginner

Which decorator is used to define a feature module in NestJS?

The @Module() decorator is used to define a feature module. It takes metadata like imports, controllers, providers, and exports to configure the module.

intermediate

Can feature modules import other modules in NestJS? Why?

Yes, feature modules can import other modules to use their exported providers. This allows sharing functionality and keeps code DRY (Don't Repeat Yourself).

intermediate

What is the difference between a root module and a feature module in NestJS?

The root module is the main app module that bootstraps the application. Feature modules are additional modules that group related features and are imported into the root or other modules.

Which decorator defines a feature module in NestJS?

A @Module()

B @Injectable()

C @Controller()

D @Component()

The @Module() decorator is used to define modules, including feature modules, in NestJS.

What is the main purpose of feature modules in NestJS?

A Bootstrap the application

B Handle HTTP requests

C Group related code by functionality

D Manage database connections

Feature modules group related components, services, and controllers to organize code by functionality.

Can a feature module import another feature module in NestJS?

A Only controllers can be imported

B No, modules must be isolated

C Only root modules can import feature modules

D Yes, to share providers and controllers

Feature modules can import other modules to reuse exported providers and controllers.

Which of these is NOT part of the @Module() metadata in a feature module?

A routes

B providers

C imports

D controllers

The @Module() decorator does not have a 'routes' property; routing is handled by controllers.

What is the root module in a NestJS app?

A A module that handles database connections

B The main module that bootstraps the app

C A feature module for user management

D A module that only contains services

The root module is the main app module that starts the application.

Explain what a feature module is in NestJS and why it is useful.

Think about how you organize tools in different boxes by their use.

Describe how feature modules interact with each other in a NestJS application.

Consider how teams share resources to work better together.