# JsonLinesJournalFormat Properties

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

## FormatKey {#formatkey-ae2c2500}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonlinesjournalformat/properties/formatkey-ae2c2500/)

[Source](https://github.com/dotnet/orleans/blob/8bc9fd244427351ad24ccc039a9e7642a42c1cc4/src/Orleans.Journaling/Formats/Json/JsonLinesJournalFormat.cs#L23)

```csharp
public string FormatKey
```

Gets the key which identifies this journal format in storage metadata and keyed service registration.

## MimeType {#mimetype-5957b625}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonlinesjournalformat/properties/mimetype-5957b625/)

[Source](https://github.com/dotnet/orleans/blob/8bc9fd244427351ad24ccc039a9e7642a42c1cc4/src/Orleans.Journaling/Formats/Json/JsonLinesJournalFormat.cs#L26)

```csharp
public string? MimeType
```

Gets the MIME type for journal storage written with this format, or `null` to use the storage provider's default.