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environment variables in node.js-apps #77

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40 changes: 39 additions & 1 deletion docs/technologies/languages/nodejs.mdx
Original file line number Diff line number Diff line change
Expand Up @@ -96,4 +96,42 @@ If your project uses the [Yarn PnP](https://yarnpkg.com/features/pnp) installati

```yml title=".yarnrc"
enableGlobalCache: false
```
```

## Environment Variables

In der Regel werden Umgebungsvariablen genutzt, um Node.js-Apps zu konfigurieren. Je nach Node.js-Version empfehlen wir unterschiedliche Varianten, um diese zu definieren.
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<Tabs groupId="environment-variables">
<TabItem value="below-20-6" label="< Node.js 20.6">
Du kannst Umgebungsvariablen in folgenden Dateien definieren. Sie sind dann automatisch in deiner App verfügbar:

- `/files/.mwsoftware/node`
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- `/files/.mwsoftware/node/.config/node/.env`
- `/etc/node/.env`

</TabItem>
<TabItem value="from-20-6" label=">= Node.js 20.6">
Ab Node.js 20.6 steht ein (experimentelles) Flag `--env-fileconfig` zur Verfügung (vgl. [Node.js-Dokumentation](https://nodejs.org/dist/latest-v20.x/docs/api/cli.html#--env-fileconfig)). Dieses kann beliebig oft angegeben werden, um .env-Dateien zu laden, deren Umgebungsvariablen dann in der App verfügbar sind.

Um das Flag zu nutzen, konfiguriere den Startbefehl deiner Node.js-App beispielsweise folgendermaßen:

```bash
node --env-fileconfig=.env server.js
```

Der Pfad zur `.env`-Datei wird dabei relativ zum Working Directory angegeben.

Nutzt du ein npm- oder yarn-Script zum Start deiner App, gilt folgendes Beispiel:

```json title="package.json"
{
[..]
"scripts": {
"start": "node --env-fileconfig=.env server.js"
}
[..]
}
```
</TabItem>
</Tabs>