# JsonJournalExtensions Fields

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

## JournalFormatKey {#journalformatkey-9c870848}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonjournalextensions/fields/journalformatkey-9c870848/)

[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.