> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.nozle.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Environment Variables

> Configuration for self-hosted deployments

When self-hosting, you'll need to configure environment variables for the API, frontend, and worker processes. Nozle Cloud handles all of this automatically.

## Core Configuration

Key variables include:

| Variable          | Description                           |
| ----------------- | ------------------------------------- |
| `DATABASE_URL`    | PostgreSQL connection string          |
| `REDIS_URL`       | Redis connection string               |
| `API_URL`         | Self-referencing API URL              |
| `SMTP_ADDRESS`    | SMTP server for invoice emails        |
| `SMTP_PORT`       | SMTP port (typically 587)             |
| `SMTP_FROM_EMAIL` | From address for transactional emails |

## Nozle API Keys

Regardless of deployment model, you'll need Nozle API keys to use the SDKs:

| Key Type    | Prefix | Use                            |
| ----------- | ------ | ------------------------------ |
| Publishable | `pk_`  | Client-side (React SDK)        |
| Secret      | `sk_`  | Server-side (Node/Python SDKs) |

Get your keys from the Nozle dashboard at [app.nozle.app](https://app.nozle.app).