identify-filetype

Identifies the file-type of a buffer using the magic-number signatures at the start of the file.

var identify = require('identify-filetype')
 
console.log(identify(some_buffer)) // => string | false

Supported types:

jpg png gif bmp tif tif nif ico psd rar zip gz msi iso rtf avi wmv wma swf flv mid pdf doc docx mp3 svg html

Tested:

tif pdf psd gif jpg png bmp tif ico rar docx gz doc rtf svg html