> For the complete documentation index, see [llms.txt](https://kinesis-school-of-programming.gitbook.io/nestjs-unleashed/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kinesis-school-of-programming.gitbook.io/nestjs-unleashed/core-module-backend-development-with-nestjs/typeorm-integration/database-connection.md).

# Database connection

Let's create a <mark style="color:blue;">`DatabaseModule`</mark> to connect to the database.

```sh
nest g mo database
```

In its <mark style="color:blue;">`imports`</mark> array, add the following:

```typescript
TypeOrmModule.forRoot({
  type: 'postgres',
  username: 'postgres',
  password: 'pass123',
  host: 'localhost',
  port: 5432,
  database: 'postgres',
  autoLoadEntities: true,
})
```

{% hint style="info" %}
The <mark style="color:blue;">`autoLoadEntities`</mark> option automates the loading of domain's entities.
{% endhint %}

<mark style="color:green;">**Commit**</mark> - Connecting to database

All right, we established a connection to the database. But this solution is not very interesting, don't you think? We are exposing all our credentials here. The same problem appeared again.

> In the **Configuration** section, we'll learn how to fix this issue through the usage of **environment variables** and also have validation/typing for them.


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