my_parser.js

var Parser = require('./parser');

// Load the fs (filesystem) module
var fs = require('fs');

// Read the contents of the file into memory.
fs.readFile('example_log.txt', function (err, logData) {

// If an error occurred, throwing it will
    // display the exception and end our app.
    if (err) throw err;

    //logData is a buffer, convert to string.
    var text = logData.toString();

    var parser = new Parser();

    console.log(parser.parse(text));
    // { A: 2, B: 14, C: 6 }
});