# Health

#### **Health Module in `client` and `admin`**

The **Health Module** is typically used to provide a mechanism for checking the health status of the application. This can be used to monitor the application's availability and performance. The Health module usually responds with information about the health of various application components, such as database connections, external API integrations, or services. In a production environment, these health checks are crucial for system monitoring, automated deployments, and alerting systems.

Both the `client` and `admin` modules include their own respective `health` modules, which serve the same purpose but are contextually tied to the `client` and `admin` functionalities.

#### **Structure and Purpose**

**1. Health Module**

The `client/health and admin/health` module provides a health check specifically related to client/admin-facing services. This can be useful for ensuring that the services used by clients and admins (e.g., authentication, data retrieval, and client-related features) are up and running.

**Path:**\
`src/modules/client/health/ and src/modules/admin/health/`

**Files:**

* **health.controller.ts**: This file defines the routes and logic for the health checks. It might include routes like `/health` that returns status codes and application health data.
* **health.module.ts**: This module imports the necessary services and configurations to enable the health check for the client side.

**Example of health controller:**

<pre class="language-ts"><code class="lang-ts"><strong>import { Controller, Get, Inject } from "@nestjs/common";
</strong>import { ApiTags, ApiOperation, ApiResponse } from "@nestjs/swagger";
import { HEALTH_SERVICE } from "../constants";
import { IHealthMessage } from "../interfaces/health-message.interface";

@ApiTags("Health")
@Controller()
export class HealthController {
  public constructor(@Inject(HEALTH_SERVICE) private readonly healthService: IHealthMessage) {}

  @Get()
  @ApiOperation({ summary: "Check the status health of the APP" })
  @ApiResponse({ status: 200, description: "The APP Admin is up and running" })
  public check(): IHealthMessage {
    return this.healthService;
  }
}


</code></pre>

Health Module:

```typescript
// Core
import { Module } from "@nestjs/common";

// Controllers
import { HealthController } from "@app/modules/admin/health/controllers/health.controller";

// Constants
import { HEALTH_MESSAGE, HEALTH_SERVICE } from "@app/modules/admin/health/constants";

@Module({
  controllers: [HealthController],
  providers: [{ provide: HEALTH_SERVICE, useValue: HEALTH_MESSAGE }],
})
export class HealthModule {}
```


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