dberesford/exiv2node — pull request #27 by dberesford (2014-05-26 18:59:59+00:00)
Title: New api call: getImageMeta()

Returns the following image properties (which are not tags but still very handy to have when processing images):

{ fileName: '/path/books.jpg',
fileSize: '993738',
mimeType: 'image/jpeg',
pixelHeight: '1200',
pixelWidth: '1600' }

Exiv2 also outputs these by default, along with the high level summary exif tags.