# JournalMetadata.FormatKey

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.journalmetadata/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.journalmetadata/properties/)

[Source](https://github.com/dotnet/orleans/blob/8bc9fd244427351ad24ccc039a9e7642a42c1cc4/src/Orleans.Journaling/IJournalStorageConsumer.cs#L61)

```csharp
public string? FormatKey
```

Gets the journal format key stored with the journal data, or `null` if no key is present.