As your application grows, placing every controller and service inside AppModule quickly becomes difficult to manage.

A better approach is to organize your application into feature modules. Each module contains everything related to a specific feature.

For example, create a module for users:

users.module.ts

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

@Module({
  controllers: [UsersController],
  providers: [UsersService],
})
export class UsersModule {}

This module contains everything related to managing users.

Next, register the module inside the root module:

import { Module } from '@nestjs/common';
import { UsersModule } from './users.module';

@Module({
  imports: [UsersModule],
})
export class AppModule {}

Here is what is happening:

• UsersModule groups the user-related functionality;
• imports registers the module with the application;
• AppModule remains clean by connecting feature modules instead of individual controllers and services.

As your application grows, you can create additional modules for products, orders, authentication, or any other feature.

Organizing your application this way makes the project easier to navigate, maintain, and scale.