---
title: fileType
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nsdocument/filetype
---

# fileType

The name of the document type, as specified in the app’s information property-list file.

## Declaration

```swift
nonisolated var fileType: String? { get set }
```

## Discussion

Discussion The document type affects how the data is filtered when it is written to or read from a file. When a document is saved, the type is determined by the entries in the app’s information property list (specified in Info.plist). You cannot use this property to change the document’s format after it has already been opened or saved. This property records only the initial document format used when first opening or saving the file.

## See Also

### Getting Document Metadata

- [fileURL](appkit/nsdocument/fileurl.md)
- [isEntireFileLoaded](appkit/nsdocument/isentirefileloaded.md)
- [fileModificationDate](appkit/nsdocument/filemodificationdate.md)
- [keepBackupFile](appkit/nsdocument/keepbackupfile.md)
- [isDraft](appkit/nsdocument/isdraft.md)
- [isDocumentEdited](appkit/nsdocument/isdocumentedited.md)
- [isInViewingMode](appkit/nsdocument/isinviewingmode.md)