Small tool to find out if some URL are loaded twice. Takes a HAR file as an entry

har_duplicate_finder.js

const fs = require('fs');

const har = JSON.parse(fs.readFileSync(process.argv[2]));

har.log.entries
	.map(({ request }) => request.url)
	.reduce((watchlist, url) => {
		const seenTimes = watchlist.get(url) || 0;
		watchlist.set(url, seenTimes + 1)

		return watchlist;
	}, new Map())
	.forEach((seenTimes, url) => {
		if (seenTimes > 1) {
			console.log(url, 'seen', seenTimes, 'time(s).');
		}
	});

console.log('Done.');