diff --git a/public/src/client/topic.js b/public/src/client/topic.js
index c11ece6f94..be32f5cd2c 100644
--- a/public/src/client/topic.js
+++ b/public/src/client/topic.js
@@ -24,7 +24,7 @@ define('forum/topic', [
 	bootbox, clipboard
 ) {
 	const Topic = {};
-	let tid = 0;
+	let tid = '0';
 	let currentUrl = '';
 
 	$(window).on('action:ajaxify.start', function (ev, data) {
@@ -38,8 +38,8 @@ define('forum/topic', [
 	});
 
 	Topic.init = async function () {
-		const tidChanged = !tid || parseInt(tid, 10) !== parseInt(ajaxify.data.tid, 10);
-		tid = ajaxify.data.tid;
+		const tidChanged = !tid || String(tid) !== String(ajaxify.data.tid);
+		tid = String(ajaxify.data.tid);
 		currentUrl = ajaxify.currentPage;
 		hooks.fire('action:topic.loading');
 
diff --git a/public/src/client/topic/events.js b/public/src/client/topic/events.js
index 4fdfcdbf4d..5b45deeb54 100644
--- a/public/src/client/topic/events.js
+++ b/public/src/client/topic/events.js
@@ -80,7 +80,7 @@ define('forum/topic/events', [
 
 	function updateBookmarkCount(data) {
 		$('[data-pid="' + data.post.pid + '"] .bookmarkCount').filter(function (index, el) {
-			return parseInt($(el).closest('[data-pid]').attr('data-pid'), 10) === parseInt(data.post.pid, 10);
+			return $(el).closest('[data-pid]').attr('data-pid') === String(data.post.pid);
 		}).html(data.post.bookmarks).attr('data-bookmarks', data.post.bookmarks);
 	}
 
@@ -88,14 +88,14 @@ define('forum/topic/events', [
 		if (
 			ajaxify.data.category &&
 			ajaxify.data.category.slug &&
-			parseInt(data.tid, 10) === parseInt(ajaxify.data.tid, 10)
+			String(data.tid) === String(ajaxify.data.tid)
 		) {
 			ajaxify.go('category/' + ajaxify.data.category.slug, null, true);
 		}
 	}
 
 	function onTopicMoved(data) {
-		if (data && data.slug && parseInt(data.tid, 10) === parseInt(ajaxify.data.tid, 10)) {
+		if (data && data.slug && String(data.tid) === String(ajaxify.data.tid)) {
 			ajaxify.go('topic/' + data.slug, null, true);
 		}
 	}
@@ -184,7 +184,7 @@ define('forum/topic/events', [
 	}
 
 	function onPostPurged(postData) {
-		if (!postData || parseInt(postData.tid, 10) !== parseInt(ajaxify.data.tid, 10)) {
+		if (!postData || String(postData.tid) !== String(ajaxify.data.tid)) {
 			return;
 		}
 		components.get('post', 'pid', postData.pid).fadeOut(500, function () {
@@ -234,7 +234,7 @@ define('forum/topic/events', [
 
 	function togglePostBookmark(data) {
 		const el = $('[data-pid="' + data.post.pid + '"] [component="post/bookmark"]').filter(function (index, el) {
-			return parseInt($(el).closest('[data-pid]').attr('data-pid'), 10) === parseInt(data.post.pid, 10);
+			return $(el).closest('[data-pid]').attr('data-pid') === String(data.post.pid);
 		});
 		if (!el.length) {
 			return;
@@ -258,7 +258,7 @@ define('forum/topic/events', [
 
 	function onNewNotification(data) {
 		const tid = ajaxify.data.tid;
-		if (data && data.tid && parseInt(data.tid, 10) === parseInt(tid, 10)) {
+		if (data && data.tid && String(data.tid) === String(tid)) {
 			socket.emit('topics.markTopicNotificationsRead', [tid]);
 		}
 	}
diff --git a/public/src/client/topic/move-post.js b/public/src/client/topic/move-post.js
index 3c154b9374..62863f16bf 100644
--- a/public/src/client/topic/move-post.js
+++ b/public/src/client/topic/move-post.js
@@ -74,7 +74,7 @@ define('forum/topic/move-post', [
 		const tidInput = moveModal.find('#topicId');
 		let targetTid = null;
 		if (ajaxify.data.template.topic && ajaxify.data.tid &&
-			parseInt(ajaxify.data.tid, 10) !== fromTid
+			String(ajaxify.data.tid) !== String(fromTid)
 		) {
 			targetTid = ajaxify.data.tid;
 		}
@@ -98,8 +98,8 @@ define('forum/topic/move-post', [
 		}
 		const targetTid = getTargetTid();
 		if (postSelect.pids.length) {
-			if (targetTid && parseInt(targetTid, 10) !== parseInt(fromTid, 10)) {
-				api.get('/topics/' + targetTid, {}).then(function (data) {
+			if (targetTid && String(targetTid) !== String(fromTid)) {
+				api.get(`/topics/${targetTid}`, {}).then(function (data) {
 					if (!data || !data.tid) {
 						return alerts.error('[[error:no-topic]]');
 					}
@@ -123,7 +123,7 @@ define('forum/topic/move-post', [
 		}
 		const targetTid = getTargetTid();
 		if (postSelect.pids.length && targetTid &&
-			parseInt(targetTid, 10) !== parseInt(fromTid, 10)
+			String(targetTid) !== String(fromTid)
 		) {
 			moveCommit.removeAttr('disabled');
 		} else {
@@ -150,7 +150,7 @@ define('forum/topic/move-post', [
 				});
 			});
 			if (data.pids.length && ajaxify.data.template.topic &&
-				parseInt(data.tid, 10) === parseInt(ajaxify.data.tid, 10)) {
+				String(data.tid) === String(ajaxify.data.tid)) {
 				ajaxify.go(`/post/${data.pids[0]}`);
 			}
 			closeMoveModal();
diff --git a/public/src/client/topic/posts.js b/public/src/client/topic/posts.js
index b88dc73608..3f9840ebcf 100644
--- a/public/src/client/topic/posts.js
+++ b/public/src/client/topic/posts.js
@@ -22,7 +22,7 @@ define('forum/topic/posts', [
 			!data ||
 			!data.posts ||
 			!data.posts.length ||
-			parseInt(data.posts[0].tid, 10) !== parseInt(ajaxify.data.tid, 10)
+			String(data.posts[0].tid) !== String(ajaxify.data.tid)
 		) {
 			return;
 		}
diff --git a/public/src/client/topic/threadTools.js b/public/src/client/topic/threadTools.js
index a66b293a73..38db844cdd 100644
--- a/public/src/client/topic/threadTools.js
+++ b/public/src/client/topic/threadTools.js
@@ -294,7 +294,7 @@ define('forum/topic/threadTools', [
 
 	ThreadTools.setLockedState = function (data) {
 		const threadEl = components.get('topic');
-		if (parseInt(data.tid, 10) !== parseInt(threadEl.attr('data-tid'), 10)) {
+		if (String(data.tid) !== threadEl.attr('data-tid')) {
 			return;
 		}
 
@@ -322,7 +322,7 @@ define('forum/topic/threadTools', [
 
 	ThreadTools.setDeleteState = function (data) {
 		const threadEl = components.get('topic');
-		if (parseInt(data.tid, 10) !== parseInt(threadEl.attr('data-tid'), 10)) {
+		if (String(data.tid) !== threadEl.attr('data-tid')) {
 			return;
 		}
 
@@ -356,7 +356,7 @@ define('forum/topic/threadTools', [
 
 	ThreadTools.setPinnedState = function (data) {
 		const threadEl = components.get('topic');
-		if (parseInt(data.tid, 10) !== parseInt(threadEl.attr('data-tid'), 10)) {
+		if (String(data.tid) !== threadEl.attr('data-tid')) {
 			return;
 		}
 
diff --git a/src/posts/queue.js b/src/posts/queue.js
index 91fab2e6e9..cc3b1078c8 100644
--- a/src/posts/queue.js
+++ b/src/posts/queue.js
@@ -61,9 +61,9 @@ module.exports = function (Posts) {
 			const tid = String(filter.tid);
 			postData = postData.filter(item => item.data.tid && String(item.data.tid) === tid);
 		} else if (Array.isArray(filter.tid)) {
-			const tids = filter.tid.map(tid => parseInt(tid, 10));
+			const tids = filter.tid.map(String);
 			postData = postData.filter(
-				item => item.data.tid && tids.includes(parseInt(item.data.tid, 10))
+				item => item.data.tid && tids.includes(String(item.data.tid))
 			);
 		}
 
diff --git a/src/posts/user.js b/src/posts/user.js
index b92aca8a9a..d096b0fa50 100644
--- a/src/posts/user.js
+++ b/src/posts/user.js
@@ -200,9 +200,9 @@ module.exports = function (Posts) {
 	}
 
 	async function updateTopicPosters(postData, toUid) {
-		const postsByTopic = _.groupBy(postData, p => parseInt(p.tid, 10));
+		const postsByTopic = _.groupBy(postData, p => String(p.tid));
 		await async.eachOf(postsByTopic, async (posts, tid) => {
-			const postsByUser = _.groupBy(posts, p => parseInt(p.uid, 10));
+			const postsByUser = _.groupBy(posts, p => String(p.uid));
 			await db.sortedSetIncrBy(`tid:${tid}:posters`, posts.length, toUid);
 			await async.eachOf(postsByUser, async (posts, uid) => {
 				await db.sortedSetIncrBy(`tid:${tid}:posters`, -posts.length, uid);
diff --git a/src/topics/fork.js b/src/topics/fork.js
index 07111eecd1..d86322a9df 100644
--- a/src/topics/fork.js
+++ b/src/topics/fork.js
@@ -91,7 +91,7 @@ module.exports = function (Topics) {
 	};
 
 	Topics.movePostToTopic = async function (callerUid, pid, tid, forceScheduled = false) {
-		tid = parseInt(tid, 10);
+		tid = String(tid);
 		const topicData = await Topics.getTopicFields(tid, ['tid', 'scheduled']);
 		if (!topicData.tid) {
 			throw new Error('[[error:no-topic]]');
@@ -109,7 +109,7 @@ module.exports = function (Topics) {
 			throw new Error('[[error:cant-move-from-scheduled-to-existing]]');
 		}
 
-		if (postData.tid === tid) {
+		if (String(postData.tid) === String(tid)) {
 			throw new Error('[[error:cant-move-to-same-topic]]');
 		}
 
diff --git a/src/topics/merge.js b/src/topics/merge.js
index 1a06adefbb..7812a3d4e4 100644
--- a/src/topics/merge.js
+++ b/src/topics/merge.js
@@ -21,7 +21,7 @@ module.exports = function (Topics) {
 		}
 
 		const otherTids = tids.sort((a, b) => a - b)
-			.filter(tid => tid && parseInt(tid, 10) !== parseInt(mergeIntoTid, 10));
+			.filter(tid => tid && String(tid) !== String(mergeIntoTid));
 
 		for (const tid of otherTids) {
 			/* eslint-disable no-await-in-loop */