var fs = require('fs');
var recognizer = require('happyuc-keyfile-recognizer');

fs.readFile('keyfile.json', (err, data) => {
    var json = JSON.parse(data);
    var result = recognizer(json);
    /** result
     *               [ 'webu', 3 ]   webu (v3) keyfile
     *  [ 'hucersale', undefined ]   Hucersale keyfile
     *                        null   no valid  keyfile
     */
}));