app.js

var   express = require("express"),
    app     = express(),
    cheerio = require("cheerio"),
    request = require('request'),
    path    = require("path");

app.use(express.static('public'));

app.get("/", function(req, res){

    if(!req.query.define){
        res.sendFile(path.join(__dirname+'/views//index.html'));
    }  else {
        if(encodeURIComponent(req.query.define).includes("%")){
            console.log("yes");
            res.header("Access-Control-Allow-Origin", "*");
            return res.status(404);
        }

        var url = 'https://www.google.co.in/search?hl=en&q=defina+' + req.query.define;
        if(req.query.lang){
            url =  url.replace('en', req.query.lang);
        }

        url = encodeURI(url);

        request({
            method: 'GET',
            url: url,
            headers: {
                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0"
            }
        }, function(err, response, body) {

            if(err){
                return console.error(err);
            }

            var dictionary = {};

            //return res.send(body);
            var $ = cheerio.load(body);


            var word  = $("div.dDoNo span").first().text();
            //console.log(word);
            if(word.length < 1){
                res.header("Access-Control-Allow-Origin", "*");
                return res.status(200).send(JSON.stringify({error: 404}));
            }

            dictionary.word = $("div.dDoNo span").first().text();

            if(!$('.lr_dct_spkr.lr_dct_spkr_off audio')){
                dictionary.pronunciation = "https:" + $('.lr_dct_spkr.lr_dct_spkr_off audio')[0].attribs.src;
                dictionary.pronunciation = dictionary.pronunciation.replace('--_gb', '--_us');
            }

            dictionary.phonetic = [];
            $(".lr_dct_ph.XpoqFe").first().find('span').each(function(i, element){
                dictionary.phonetic.push($(this).text());
            });

            dictionary.meaning = {};


            var definitions = $(".lr_dct_ent.vmod.XpoqFe");

            var mainPart = definitions.first().find(".lr_dct_sf_h");

            var meaning = {};

            mainPart.each(function(i, element){
                var type = $(this).find('i').text();
                meaning[type] = [];
                var selector = $(".lr_dct_sf_sens").eq(i).find("div[style='margin-left:20px'] > .PNlCoe");

                selector.each(function(i, element){
                    var newDefinition = {};
                    newDefinition.definition = $(this).find("div[data-dobid='dfn']").text();
                    var example  = $(this).find("span.vmod .vk_gy").text();
                    var synonymsText = $(this).find("div.vmod td.lr_dct_nyms_ttl + td > span:not([data-log-string='synonyms-more-click'])").text();

                    var synonyms = synonymsText.split(/,|;/).filter(synonym => synonym!= ' ' && synonym).map(function(item) {
                        return item.trim();
                    });

                    if(example.length > 0)
                        newDefinition.example = example.replace(/(^")|("$)/g, '');

                    if(synonyms.length > 0)
                        newDefinition.synonyms = synonyms;

                    meaning[type].push(newDefinition);
                });

            }) ;

            dictionary.meaning = meaning;

            Object.keys(dictionary).forEach(key => {(Array.isArray(dictionary[key]) && !dictionary[key].length) && delete dictionary[key]})

            res.header("Content-Type",'application/json');
            res.header("Access-Control-Allow-Origin", "*");
            res.send(JSON.stringify(dictionary, null, 4));

        });
    }
});

// app.get("/languageCode.txt", function(req, res){
//     res.sendFile(__dirname + "/languageCode.txt");
// })

app.listen(3000, 'localhost', function(){
    console.log("I am listening in port 3000...");
});