NestJS Fundamentals
Modules, Controllers, Providers, Dependency Injection, Decorators, CLI
1Which decorator is used to define a controller in NestJS?
Which decorator is used to define a controller in NestJS?
คำตอบ
The @Controller() decorator marks a class as a controller and optionally accepts a route prefix. Controllers handle incoming HTTP requests and return responses to the client. They use decorators like @Get(), @Post() to define routes.
2What is a provider in NestJS?
What is a provider in NestJS?
คำตอบ
A provider is a class that can be injected as a dependency through NestJS's dependency injection system. Services, repositories, factories, and helpers are providers. They are annotated with @Injectable() and declared in a module's providers array.
3How to create a new NestJS project with the CLI?
How to create a new NestJS project with the CLI?
คำตอบ
The 'nest new project-name' command creates a new NestJS project with a standard structure including src/, test/, and configuration files. The CLI prompts to choose the package manager (npm, yarn, pnpm) and automatically generates initial code with the root module and a basic controller.
What is the role of the @Injectable() decorator?
In NestJS, how to inject a service into a controller?
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