What is the primary benefit of using custom HTTP exception filters in NestJS?
They replace the need for traditional try...catch blocks in your controllers.
They prevent any and all errors from being thrown in your application.
They simplify error handling by automatically logging all exceptions.
They allow you to define specific error responses for different HTTP exception types.
What is the recommended approach for handling exceptions in a production-ready NestJS application?
Implement only global exception filters for a centralized approach.
Use a combination of global and custom exception filters for a layered approach.
Rely solely on the default NestJS error handling mechanism.
Disable exception handling altogether for optimal performance.
Which built-in Pipe is suitable for automatically validating incoming requests against a TypeScript class?
ParseIntPipe
ValidationPipe
ParseBoolPipe
DefaultValuePipe
What is the primary security concern associated with storing session data in cookies?
Database injection attacks
Cross-site request forgery (CSRF) attacks
Cross-site scripting (XSS) attacks
Denial-of-service (DoS) attacks
What is the primary testing framework used for unit testing in NestJS?
Jasmine
Jest
Mocha
Chai
What is the role of the 'transform()' method within a custom Pipe in NestJS?
It determines if the Pipe should be applied globally.
It defines the metadata associated with the Pipe.
It contains the logic to transform the input data.
It specifies how the Pipe should handle errors.
Which module is essential for implementing JWT authentication in a NestJS application?
@nestjs/passport
@nestjs/common
@nestjs/core
@nestjs/jwt
What is a key advantage of using a message broker like RabbitMQ or Kafka for NestJS microservice communication?
Simplified database management
Improved error handling and retries
Reduced need for code testing
Automatic user interface generation
What is the difference between HttpException and a custom exception class in NestJS?
HttpException
HttpException is deprecated and should always be replaced with custom exception classes.
HttpException must be caught by custom exception filters, while custom exceptions are handled automatically.
HttpException is used for generic HTTP errors, while custom exceptions represent specific business logic errors.
There is no practical difference; both can be used interchangeably for error handling.
Why is it generally advisable to have a balance of different testing types (unit, integration, E2E) in a NestJS project?
To eliminate the possibility of introducing bugs during development entirely
To reduce the need for manual testing efforts completely
To ensure comprehensive test coverage across different levels of the application
To minimize the execution time of the entire test suite