diff --git a/api/toot.js b/api/toot.js
index b234905..8e186f2 100644
--- a/api/toot.js
+++ b/api/toot.js
@@ -19,20 +19,21 @@
 const http = require("http");
 
 http
-	.createServer(async (req, res) => {
+	.createServer(async (request, response) => {
 		const buffers = [];
-		for await (const chunk of req) {
+		for await (const chunk of request) {
 			buffers.push(chunk);
 		}
 		const data = Buffer.concat(buffers).toString();
-		const params = new URLSearchParams(data);
+		const searchParameters = new URLSearchParams(data);
 
-		const text = params.get("text") || "";
-		const instanceURL = params.get("instance") || "https://mastodon.social/";
+		const text = searchParameters.get("text") || "";
+		const instanceURL =
+			searchParameters.get("instance") || "https://mastodon.social/";
 
 		const finalURL = new URL("share", instanceURL);
 		finalURL.search = new URLSearchParams({ text }).toString();
 
-		res.writeHead(303, { Location: finalURL.toString() }).end();
+		response.writeHead(303, { Location: finalURL.toString() }).end();
 	})
 	.listen(8000);
diff --git a/src/count.js b/src/count.js
index d1aa79a..c2c5dba 100644
--- a/src/count.js
+++ b/src/count.js
@@ -38,25 +38,24 @@ if (
 	window.location.host === "s2f.kytta.dev" ||
 	window.location.host === "share2fedi.kytta.dev"
 ) {
-	fetch("//gc.zgo.at/", { method: "HEAD" })
-		.then((result) => {
-			if (!result.ok) {
-				return;
-			}
+	// eslint-disable-next-line unicorn/prefer-top-level-await
+	fetch("//gc.zgo.at/", { method: "HEAD" }).then((result) => {
+		if (!result.ok) {
+			return;
+		}
 
-			const screen = encodeURIComponent(
-				[
-					window.screen.width,
-					window.screen.height,
-					window.devicePixelRatio || 1,
-				].join(",")
-			);
+		const screen = encodeURIComponent(
+			[
+				window.screen.width,
+				window.screen.height,
+				window.devicePixelRatio || 1,
+			].join(",")
+		);
 
-			const random = encodeURIComponent(Math.random().toString(36).slice(2));
+		const random = encodeURIComponent(Math.random().toString(36).slice(2));
 
-			navigator.sendBeacon(
-				`https://share2fedi.goatcounter.com/count?p=%2F&s=${screen}&b=0&rnd=${random}`
-			);
-		})
-		.catch((_) => {});
+		navigator.sendBeacon(
+			`https://share2fedi.goatcounter.com/count?p=%2F&s=${screen}&b=0&rnd=${random}`
+		);
+	});
 }
diff --git a/src/main.js b/src/main.js
index 4147288..0d24963 100644
--- a/src/main.js
+++ b/src/main.js
@@ -30,8 +30,8 @@ const INSTANCE_LIST_URL = "https://api.joinmastodon.org/servers";
 const LOCAL_STORAGE_KEY = "recentInstances";
 const RECENT_INSTANCES_SIZE = 5;
 
-const $instance = document.getElementById("instance");
-const $instanceDatalist = document.getElementById("instanceDatalist");
+const $instance = document.querySelector("#instance");
+const $instanceDatalist = document.querySelector("#instanceDatalist");
 
 /**
  * Adds missing "https://" and ending slash to the URL
@@ -40,7 +40,7 @@ const $instanceDatalist = document.getElementById("instanceDatalist");
  * @return {string} normalized URL
  */
 function normalizeUrl(url) {
-	if (url.indexOf("http://") == -1 && url.indexOf("https://") == -1) {
+	if (!url.includes("http://") && !url.includes("https://")) {
 		url = "https://" + url;
 	}
 	if (url.charAt(url.length - 1) !== "/") {
@@ -59,16 +59,18 @@ function onLoadInstancesSuccess() {
 	}
 
 	const currentInstance = $instance.value;
-	const instanceDomains = JSON.parse(this.responseText).map((i) => i.domain);
-	if (currentInstance && instanceDomains.indexOf(currentInstance) < 0) {
+	const instanceDomains = JSON.parse(this.responseText).map(
+		(index) => index.domain
+	);
+	if (currentInstance && !instanceDomains.includes(currentInstance)) {
 		instanceDomains.push(currentInstance);
 	}
 	instanceDomains.sort();
 
-	for (let i = 0; i < instanceDomains.length; i++) {
+	for (const instanceDomain of instanceDomains) {
 		const $option = document.createElement("option");
-		$option.value = normalizeUrl(instanceDomains[i]);
-		$instanceDatalist.appendChild($option);
+		$option.value = normalizeUrl(instanceDomain);
+		$instanceDatalist.append($option);
 	}
 }
 
@@ -106,6 +108,8 @@ function rememberInstance(instance) {
 	);
 }
 
+// Used in HTML
+// eslint-disable-next-line no-unused-vars
 function onFormSubmit(form) {
 	const formData = new FormData(form);
 
@@ -117,17 +121,19 @@ function onFormSubmit(form) {
 
 let prefillInstance = getRecentInstances()[0];
 
-const URLParams = window.location.search.substr(1).split("&");
-for (let i = 0; i < URLParams.length; i++) {
-	const URLParamPair = URLParams[i].split("=");
-	if (URLParamPair[0] === "text") {
-		document.getElementById("text").value = decodeURIComponent(URLParamPair[1]);
-	} else if (URLParamPair[0] === "instance") {
-		prefillInstance = decodeURIComponent(URLParamPair[1]);
+const URLParameters = window.location.search.slice(1).split("&");
+for (const URLParameter of URLParameters) {
+	const URLParameterPair = URLParameter.split("=");
+	if (URLParameterPair[0] === "text") {
+		document.querySelector("#text").value = decodeURIComponent(
+			URLParameterPair[1]
+		);
+	} else if (URLParameterPair[0] === "instance") {
+		prefillInstance = decodeURIComponent(URLParameterPair[1]);
 	}
 }
 
-if (prefillInstance != null) {
+if (prefillInstance != undefined) {
 	$instance.value = normalizeUrl(prefillInstance);
 }