# IJournalMetadata.Format

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

```csharp
public abstract string? Format
```

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