is-tar 
Check if a Buffer/Uint8Array is a TAR file
Install
$ npm install --save is-tar
Usage
var isTar = require('is-tar');
var read = require('fs').readFileSync;
isTar(read('file.tar'));
// => true
License
MIT © Kevin Mårtensson
Check if a Buffer/Uint8Array is a TAR file
$ npm install --save is-tar
var isTar = require('is-tar');
var read = require('fs').readFileSync;
isTar(read('file.tar'));
// => true
MIT © Kevin Mårtensson