Read lines of a file and sort them by status (200 or 404) to files

batch-url-status-sorter.js

#!/usr/bin/node
var readline = require('readline');
var fs       = require('fs');
var request  = require('request');

var inputFilePath = '/home/under/';
var inputFileName = '1.txt';
var output200File = 'urls-200.txt';
var output404File = 'urls-404.txt';

var rl = readline.createInterface({
    input : fs.createReadStream(inputFilePath + inputFileName),
    output: process.stdout,
    terminal: false
});

rl.on('line',function(line){
     request(line, function (error, response, body) {
        if (!error && response.statusCode === 200) {
                fs.appendFile(output200File, line + "\n");
        } else {
                fs.appendFile(output404File, line + "\n");
        }
     });
});