test.js

const fs = require("fs");

const keywords = JSON.parse(fs.readFileSync("keywords.txt").toString());
const news = JSON.parse(fs.readFileSync("news.txt").toString());
const start1 = Date.now();
const foundNews = []

for (const aNews of news) {
	const stack = [];
	for (const keyword of keywords) {
		if (aNews["title"].includes(keyword["title"]) || aNews["lead"]?.includes(keyword["title"])) {
			stack.push(keyword["title"]);
		}
	}
	if (stack.length) {
		foundNews.push([aNews["id"], stack]);
	}
}
console.log(Date.now() - start1);