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What is the primary purpose of a service in NestJS?

To define application routes
To encapsulate business logic and share data between components
To handle HTTP requests
To manage database connections

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What is the purpose of serialization in NestJS?

To optimize database queries
To convert JSON data to class instances and vice versa
To encrypt sensitive information
To define API routes

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Which of the following is true about interceptors in NestJS?

Interceptors can only modify request data
Interceptors execute before guards in the request pipeline
Interceptors cannot be used for logging
Interceptors are only used for error handling

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Which decorator is used to inject a service into a controller in NestJS?

@Inject
@Service
@Injectable
@InjectableService

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What is the purpose of guards in NestJS?

To validate request data
To handle HTTP responses
To implement authentication and authorization logic
To define application routes

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What is the purpose of the @Controller() decorator in NestJS?

To define a service
To define a module
To define a middleware
To define a controller

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What does the @Injectable() decorator signify in NestJS?

It indicates that the class is a service
It indicates that the class is a controller
It indicates that the class is a module
It indicates that the class is a middleware

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What is Dependency Injection (DI) in NestJS?

A way to inject dependencies into components
A method for executing asynchronous tasks
A data encryption technique
A form of HTML injection vulnerability

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Which command is used to create a new NestJS application?

ng new
nest new
npm create nest
create-nest-app

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How can you enable CORS (Cross-Origin Resource Sharing) in NestJS?

By using the @EnableCors() decorator
By configuring CORS in the nest-cli.json file
By using the @CrossOrigin() decorator
By setting CORS headers in middleware

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What is NestJS?

A database management system
A TypeScript-based Node.js framework
A front-end JavaScript library
An operating system kernel

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Which of the following is NOT a core concept in NestJS?

Middleware
Components
Modules
Schemas

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Which of the following is true about modules in NestJS?

Modules are optional in NestJS applications
Modules are a collection of components, controllers, services, and more
NestJS doesn't support modules
Modules can only contain controllers

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Which command is used to start a NestJS application in development mode?

nest start
npm run start
npm run dev
node server.js

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Which of the following is NOT a valid parameter decorator in NestJS?

@Body()
@Param()
@Query()
@Header()

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What is the purpose of the @Module() decorator in NestJS?

To define a service
To define a module
To define a controller
To define a component

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What programming language does NestJS primarily use?

Python
JavaScript
TypeScript
Java

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What is the purpose of DTOs (Data Transfer Objects) in NestJS?

To define database schemas
To encapsulate data validation logic
To define service interfaces
To manage authentication

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How can you configure authentication in NestJS?

By using the @Authentication() decorator
By defining middleware to handle authentication logic
By setting up a third-party authentication provider
By using the built-in AuthGuard class

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What is the purpose of dependency injection in NestJS?

To manage HTTP requests
To optimize database queries
To inject dependencies into components
To handle file uploads

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Which of the following is NOT a valid lifecycle hook in NestJS?

onInit
afterContentInit
onModuleInit
ngOnInit

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How can you configure logging in NestJS?

By using the @Logger() decorator
By setting up a logging provider in the module
By configuring logging in the nest-cli.json file
By using the console.log() function

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What is the primary role of guards in NestJS?

Data validation
Error handling
Authentication and authorization
Request routing

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How can you handle CORS (Cross-Origin Resource Sharing) in NestJS?

By using the @CrossOrigin() decorator
By configuring CORS in the nest-cli.json file
By setting CORS headers in middleware
By using the @EnableCors() decorator

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What is the purpose of the @Injectable() decorator in NestJS?

It indicates that the class is a module
It indicates that the class is a controller
It indicates that the class is a service
It indicates that the class is a middleware

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What is NestJS primarily built on top of?

Express.js
Django
Flask
Laravel

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Which of the following is NOT a valid HTTP method in NestJS?

GET
DELETE
PATCH
UPDATE

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What does NestJS use as its primary programming language?

Java
TypeScript
Python
Ruby

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What is the purpose of Dependency Injection (DI) in NestJS?

To inject dependencies into components
To manage HTTP requests
To handle database operations
To define application routes

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What is the primary purpose of pipes in NestJS?

Data transformation
Handling HTTP requests
Validating input data
Defining application routes

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