1. you're overwriting the file on each loop,
2. keywords is an array, so it doesn't get saved, furthermore, keywords column will always contain all keywords, not the matching ones...

as requests are async, you need to track them all, and write results only when all requests are finished.

try this:

• match case insensitive, and store only matching keywords for that site, not all (I also added "no match" for domains with no match)
• store results outside the loop
• move writing results into a separate function
• add request counter and callback to track requests
• write results when requests are done

the code:

var request = require("request");
var cheerio = require("cheerio");
const xlsx = require("xlsx");

const jsonData = [{ Domain: "blogger.com" }, { Domain: "stackoverflow.com" }];

var UrlArray = [];

function writeResults() {

    const finalJsonData = JSON.stringify(UrlArray);
    const ws = xlsx.utils.json_to_sheet(UrlArray);
    const wb = xlsx.utils.book_new();
    xlsx.utils.book_append_sheet(wb, ws, "Responses");
    xlsx.writeFile(wb, "output.xlsx");

}

function fetchTitle(url, onComplete = null) {

    request(url, function (error, response, body) {
        var output = url; // default to URL

        if (!error && (response && response.statusCode) === 200) {
            var $ = cheerio.load(body);
            console.log(`URL = ${url}`);

            var title = $("head > title").text().trim();
            console.log(`Title = ${title}`);
            output = `[${title}] (${url})`;
            var keywords = ["Developers", "blog"];
            var results = [];
            for (var i = 0; i < keywords.length; i++) {
                let match = title.match(new RegExp(keywords[i], "gi"));
                if (match && match.length > 0) {
                    results.push(keywords[i]);
                }
            }

            UrlArray.push({
                Domain: url,
                Keywords: results.length > 0 ? results.join(', ') : 'no match',
                Title: output,
            });

        } else {
            console.log(
                `Error = ${error}, code = ${response && response.statusCode}`
            );
        }

        console.log(`output = ${output} \n\n`);

        if (onComplete) onComplete(output);
    });
}

let counter = 0;

jsonData.forEach(function (table) {
    var tableName = table.Domain;
    var URL = "http://" + tableName;
    fetchTitle(URL, ()=>{
        counter++;
        if(counter === jsonData.length) {
            console.log(`all ${counter} requests done`);
            writeResults();
        }
    });
});