What Are Modules in Nest.js

Modules are used to organize your application into separate parts.

As your project grows, you will have multiple controllers and services. Modules help you group related functionality together and keep your code structured.

Every Nest.js application has at least one module:

app.module.ts

This is the root module. It connects all parts of your application.

A module looks like this:

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

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

Here is what is happening:

• controllers: registers controllers used in this module;
• providers: registers services that can be injected;
• imports: allows you to use other modules.

Modules help you:

• Group related features together;
• Keep your code organized;
• Scale your application more easily.

Instead of putting everything in one place, you split your application into logical parts.