What is the role of modules in the architecture of applications on Nest.js?

In Nest.js, modules play a key role in organizing the application's architecture. They serve to:

• Group related components: controllers, services, providers, and other modules.
• Encapsulate functionality: modules allow dividing the application into logical parts, simplifying maintenance and scaling.
• Manage dependencies: through the dependency injection system, modules define which providers are available inside and outside.

Example of a module:

import { Module } from '@nestjs/common';
import { UsersService } from './users.service';
import { UsersController } from './users.controller';

@Module({
  controllers: [UsersController],
  providers: [UsersService],
  exports: [UsersService], // Export the service for use in other modules
})
export class UsersModule {}

Thus, modules ensure structure, reusability, and convenient dependency management in the application.