Summary
Modules are classes decorated to group related controllers, services, and imports, enabling structured and scalable code organization.

General domain of usage
Backend application structure and organization



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:

```ts
app.module.ts
```

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

A module looks like this:

```ts id="mod1"
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.


Learn how to build structured backend applications with Nest.js. Organize your code using controllers, services, and modules, handle requests and data validation, and create a complete API using a scalable architecture.

Set up your first Nest.js application and understand how it is structured. Learn how the main files work together to handle requests and organize backend logic.

Learn how to handle requests in Nest.js using controllers and routes. Define endpoints, work with route and query parameters, and control how your backend responds to client requests.

Learn how to organize backend logic using services. Move business logic out of controllers, structure your code properly, and understand how different parts of your application work together.

Learn how Nest.js organizes applications using modules and dependency injection. Understand how different parts of your backend connect and how to structure your code into scalable, maintainable features.

Learn how to handle and validate data in Nest.js. Work with request body data, define structured DTOs, and ensure incoming data is correct using validation pipes.

Summarize what you have learned throughout the track and reinforce your understanding of backend development. Review key concepts and see how they come together into a complete, structured application.

What Are Modules in Nest.js