Get valid MC names from a text file

index.js

const lineByLine = require("n-readlines");
const axios = require("axios");
const fs = require("fs");

function has(str, char) {
	return str.indexOf(char) !== -1;
}

const liner = new lineByLine("./words.txt");
var outFile = fs.createWriteStream("validnames.txt");

var line;
var currentIndex = 0;
async function looper() {
	line = liner.next();
	console.log(currentIndex);
	if (!line) {
		console.log("done");
		outFile.close();
		return;
	} else {
		line = line.toString("ascii");
		if (!has(line, "-") && !has(line, ".") && !has(line, "'") && !has(line, "&")) {
			try {
				// https://stackoverflow.com/a/49139664/9329945
				await new Promise(resolve => setTimeout(resolve, 1080));
				var res = await axios.get("https://api.mojang.com/users/profiles/minecraft/" + line);
				if (res.status === 204) {
					outFile.write(line + "\n");
					console.log(line);
				}
			} catch (e) {

			}
		}
		currentIndex++;
		await looper();
	}
}

looper();