# JsonJournalExtensions.JournalFormatKey

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonjournalextensions/) | [Fields](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonjournalextensions/fields/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Journaling/Formats/Json/JsonJournalExtensions.cs)

```csharp
public const string JournalFormatKey
```

The well-known key for the JSON Lines journal format.