diff --git a/frontend/src/scripts/controllers/tag-controller.js b/frontend/src/scripts/controllers/tag-controller.ts
similarity index 68%
rename from frontend/src/scripts/controllers/tag-controller.js
rename to frontend/src/scripts/controllers/tag-controller.ts
index 11de721e0..afe757c76 100644
--- a/frontend/src/scripts/controllers/tag-controller.js
+++ b/frontend/src/scripts/controllers/tag-controller.ts
@@ -1,11 +1,11 @@
 import * as DB from "../db";
 import * as ModesNotice from "../elements/modes-notice";
 
-export function saveActiveToLocalStorage() {
-  let tags = [];
+export function saveActiveToLocalStorage(): void {
+  const tags: string[] = [];
 
   try {
-    DB.getSnapshot().tags.forEach((tag) => {
+    DB.getSnapshot().tags?.forEach((tag) => {
       if (tag.active === true) {
         tags.push(tag._id);
       }
@@ -21,10 +21,10 @@ export function saveActiveToLocalStorage() {
   } catch (e) {}
 }
 
-export function clear(nosave = false) {
+export function clear(nosave = false): void {
   const snapshot = DB.getSnapshot();
 
-  snapshot.tags = snapshot.tags.map((tag) => {
+  snapshot.tags = snapshot.tags?.map((tag) => {
     tag.active = false;
 
     return tag;
@@ -35,10 +35,10 @@ export function clear(nosave = false) {
   if (!nosave) saveActiveToLocalStorage();
 }
 
-export function set(tagid, state, nosave = false) {
+export function set(tagid: string, state: boolean, nosave = false): void {
   const snapshot = DB.getSnapshot();
 
-  snapshot.tags = snapshot.tags.map((tag) => {
+  snapshot.tags = snapshot.tags?.map((tag) => {
     if (tag._id === tagid) {
       tag.active = state;
     }
@@ -51,8 +51,8 @@ export function set(tagid, state, nosave = false) {
   if (!nosave) saveActiveToLocalStorage();
 }
 
-export function toggle(tagid, nosave = false) {
-  DB.getSnapshot().tags.forEach((tag) => {
+export function toggle(tagid: string, nosave = false): void {
+  DB.getSnapshot().tags?.forEach((tag) => {
     if (tag._id === tagid) {
       if (tag.active === undefined) {
         tag.active = true;
@@ -65,16 +65,18 @@ export function toggle(tagid, nosave = false) {
   if (!nosave) saveActiveToLocalStorage();
 }
 
-export function loadActiveFromLocalStorage() {
+export function loadActiveFromLocalStorage(): void {
   // let newTags = $.cookie("activeTags");
-  let newTags = window.localStorage.getItem("activeTags");
+  let newTags: string[] | string = window.localStorage.getItem(
+    "activeTags"
+  ) as string;
   if (newTags != undefined && newTags !== "") {
     try {
       newTags = JSON.parse(newTags) ?? [];
     } catch (e) {
       newTags = [];
     }
-    newTags.forEach((ntag) => {
+    (newTags as string[]).forEach((ntag) => {
       toggle(ntag, true);
     });
     saveActiveToLocalStorage();
diff --git a/frontend/src/scripts/pages/settings.ts b/frontend/src/scripts/pages/settings.ts
index 696e35a00..cae7cbcb3 100644
--- a/frontend/src/scripts/pages/settings.ts
+++ b/frontend/src/scripts/pages/settings.ts
@@ -835,7 +835,7 @@ $(document).on(
   ".pageSettings .section.tags .tagsList .tag .tagButton",
   (e) => {
     const target = e.currentTarget;
-    const tagid = $(target).parent(".tag").attr("id");
+    const tagid = $(target).parent(".tag").attr("id") as string;
     TagController.toggle(tagid);
     $(target).toggleClass("active");
   }