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What is the 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 does NestJS use as its primary programming language?

Java
TypeScript
Python
Ruby

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Which of the following is true about providers in NestJS?

Providers are only used for database operations
Providers are singletons by default
Providers cannot be injected into other components
Providers are only used for logging

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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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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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How can you handle file uploads in NestJS?

By using the @FileUpload() decorator
By configuring middleware to parse multipart/form-data
By using the fs module from Node.js
By defining a custom interceptor

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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 does serialization enable in NestJS?

Efficient database queries
Type checking
Conversion of JSON data to class instances and vice versa
Secure authentication

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

@Inject
@Service
@Injectable
@InjectableService

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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 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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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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What does Dependency Injection (DI) enable in NestJS?

Better performance
Code reuse
Tight coupling
Simpler debugging

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

Middleware
Components
Modules
Schemas

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In NestJS, which decorator is used to inject dependencies into a component?

@Injectable
@Inject
@Dependency
@Component

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

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

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What is NestJS primarily built on top of?

Express.js
Django
Flask
Laravel

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

By using the @CrossOrigin() decorator
By using the @CrossOrigin() decorator
By setting CORS headers in middleware
By using the @EnableCors() decorator

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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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How can you handle errors globally in NestJS?

By using the @ErrorHandler() decorator
By defining an exception filter
By setting up a catch-all route
By using the try...catch statement in controllers

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

onInit
afterContentInit
onModuleInit
ngOnInit

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What is the purpose of pipes in NestJS?

To define data models
To handle HTTP requests
To transform data between the client and server
To validate input data

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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 decorator is used to define a controller in NestJS?

@Service
@Component
@Controller
@Module

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