What is the role of a controller in NestJS?
Controllers handle incoming HTTP requests and return responses. They are decorated with @Controller('route-prefix') and their methods use HTTP-method decorators like @Get(), @Post(), etc. Controllers are thin — they delegate business logic to providers/services.
A controller is responsible for handling incoming requests and returning responses to the client. It should remain thin and delegate actual business logic to services.
Basic controller example
Key responsibilities of a controller:
Map routes to handler methods using decorators.
Extract data from the request (params, query, body, headers).
Delegate logic to services.
Return the response (NestJS handles serialization automatically).