Basic 301 redirect checker using NodeJS

301-redirect-checker.js

var Crawler         = require("crawler");
var map             = require("lodash.map");
var chalk           = require('chalk');
var errorStyle      = chalk.bold.red;
var successStyle    = chalk.bold.green;

var errors = [];

var c = new Crawler({
    rateLimit: 200,
    maxConnections: 3,
    callback: function(error, res, done) {
        var requestedUri = res.options.uri;
        var targetUri    = urlMap[requestedUri];
        var actualUri    = res.request.uri.href;

        console.log("Requesting: " + requestedUri);
        if(error) {
            console.log(error)
        } else {
            
            if (actualUri !== targetUri) {
                console.log("Fail (" + actualUri + ") \n");
                errors.push(requestedUri + " ==> " + actualUri + "[" + res.statusCode + "] (expected: " + targetUri + ")");
            } else {
                console.log("Success (" + actualUri + ") \n");
            }
        }
        done();
    }
});

c.on('drain',function(){
    if (errors.length) {        
        errors.forEach(function(error){
            console.log( errorStyle( error ) + "\n");
        });
    } else {
        console.log( successStyle( "All uris redirected correctly!") );
    }
});

// Urls to test in format "old" => "new"
var urlMap = {
    
};


var urls = map(urlMap, function(value, key) {
    return key;
});

c.queue(urls);