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I am currently using Sharepoint 2013 and am using this URI to get some basic metadata about the documents under the document directory: /_api/web/Lists/GetByTitle('Documents')/Items?$select=FileLeafRef,FileRef,Modified,FileSystemObjectType,GUID.

What I am looking for is to additionally get the MIME type or application type of a file though this call. I would think that simply adding another field such as FileType would suffice, but it doesn't seem so. Is there a way to get this information from this call?

If the MIME type cannot be retrieved from this call, is there a separate call I can make to get such information?

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    Note that SharePoint doesn't store any information about the MIME type of files, it's added by IIS during the request for a specific resource, mapped by file extension.
    – James Love
    May 21 '16 at 13:18
  • Thank you, @JamesLove. Do you know of a field that I can add to my URI that just returns the file extension? May 23 '16 at 19:59
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    Try DocIcon - it returns the extension to be used to shown the icon of the doc.
    – James Love
    May 24 '16 at 9:47
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To determine file type you could add File_x0020_Type or DocIcon to the list of selected properties, for example:

/_api/web/lists/getbytitle('<list title>')/items?$select=File_x0020_Type

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