diff --git a/gymboard-app/src/api/main/auth.ts b/gymboard-app/src/api/main/auth.ts
index 141f80a..6343393 100644
--- a/gymboard-app/src/api/main/auth.ts
+++ b/gymboard-app/src/api/main/auth.ts
@@ -1,6 +1,5 @@
 import { api } from 'src/api/main/index';
 import {AuthStoreType} from 'stores/auth-store';
-import Timeout = NodeJS.Timeout;
 import { WeightUnit } from 'src/api/main/submission';
 import {Page, PaginationOptions, toQueryParams} from 'src/api/main/models';
 
@@ -67,41 +66,6 @@ export enum UserFollowResponse {
 }
 
 class AuthModule {
-  private static readonly TOKEN_REFRESH_INTERVAL_MS = 30000;
-
-  private tokenRefreshTimer?: Timeout;
-
-  /**
-   * Attempts to use the given credentials to obtain an access token for
-   * sending authenticated requests.
-   * @param authStore The auth store to use to update app state.
-   * @param credentials The credentials for logging in.
-   */
-  public async login(authStore: AuthStoreType, credentials: TokenCredentials) {
-    authStore.token = await this.getNewToken(credentials);
-    authStore.user = await this.getMyUser(authStore);
-    // Load the user's attached data right away too.
-    const [personalDetails, preferences, roles] = await Promise.all([
-      this.getMyPersonalDetails(authStore),
-      this.getMyPreferences(authStore),
-      this.getMyRoles(authStore)
-    ]);
-    authStore.user.personalDetails = personalDetails;
-    authStore.user.preferences = preferences;
-    authStore.roles = roles;
-
-    clearTimeout(this.tokenRefreshTimer);
-    this.tokenRefreshTimer = setInterval(
-      () => this.refreshToken(authStore),
-      AuthModule.TOKEN_REFRESH_INTERVAL_MS
-    );
-  }
-
-  public logout(authStore: AuthStoreType) {
-    authStore.logOut();
-    clearTimeout(this.tokenRefreshTimer);
-  }
-
   public async register(payload: UserCreationPayload): Promise<User> {
     const response = await api.post('/auth/register', payload);
     return response.data;
@@ -117,18 +81,9 @@ class AuthModule {
     return response.data.token;
   }
 
-  public async refreshToken(authStore: AuthStoreType) {
-    try {
-      const response = await api.get('/auth/token', authStore.axiosConfig);
-      authStore.token = response.data.token;
-    } catch (error: any) {
-      authStore.logOut();
-      if (error.response) {
-        console.warn('Failed to refresh token: ', error.response);
-      } else {
-        console.error(error);
-      }
-    }
+  public async refreshToken(authStore: AuthStoreType): Promise<string> {
+    const response = await api.get('/auth/token', authStore.axiosConfig);
+    return response.data.token;
   }
 
   public async getMyUser(authStore: AuthStoreType): Promise<User> {
diff --git a/gymboard-app/src/components/AccountMenuItem.vue b/gymboard-app/src/components/AccountMenuItem.vue
index a3e551b..24b407e 100644
--- a/gymboard-app/src/components/AccountMenuItem.vue
+++ b/gymboard-app/src/components/AccountMenuItem.vue
@@ -22,7 +22,7 @@ account-related actions.
             <q-item-label>{{ $t('accountMenuItem.settings') }}</q-item-label>
           </q-item-section>
         </q-item>
-        <q-item clickable v-close-popup @click="api.auth.logout(authStore)">
+        <q-item clickable v-close-popup @click="authStore.logOut()">
           <q-item-section>
             <q-item-label>{{ $t('accountMenuItem.logOut') }}</q-item-label>
           </q-item-section>
@@ -42,7 +42,6 @@ account-related actions.
 
 <script setup lang="ts">
 import { useAuthStore } from 'stores/auth-store';
-import api from 'src/api/main';
 import { useRoute, useRouter } from 'vue-router';
 import { getUserRoute } from 'src/router/user-routing';
 
diff --git a/gymboard-app/src/layouts/MainLayout.vue b/gymboard-app/src/layouts/MainLayout.vue
index 3cfbb2e..8a11bda 100644
--- a/gymboard-app/src/layouts/MainLayout.vue
+++ b/gymboard-app/src/layouts/MainLayout.vue
@@ -52,7 +52,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from 'vue';
+import {onMounted, ref} from 'vue';
 import AccountMenuItem from 'components/AccountMenuItem.vue';
 import {useAuthStore} from 'stores/auth-store';
 
@@ -62,4 +62,8 @@ const leftDrawerOpen = ref(false);
 function toggleLeftDrawer() {
   leftDrawerOpen.value = !leftDrawerOpen.value;
 }
+
+onMounted(async () => {
+  await authStore.tryLogInWithStoredToken();
+});
 </script>
diff --git a/gymboard-app/src/leaflet.d.js.ts b/gymboard-app/src/leaflet.d.js.ts
index b745891..23aa587 100644
--- a/gymboard-app/src/leaflet.d.js.ts
+++ b/gymboard-app/src/leaflet.d.js.ts
@@ -1,3 +1,6 @@
+/**
+ * Module declaration for the "leaflet" library for showing openstreetmap content.
+ */
 declare module 'leaflet';
 
 export {};
diff --git a/gymboard-app/src/pages/auth/LoginPage.vue b/gymboard-app/src/pages/auth/LoginPage.vue
index d3f428c..cae2d75 100644
--- a/gymboard-app/src/pages/auth/LoginPage.vue
+++ b/gymboard-app/src/pages/auth/LoginPage.vue
@@ -55,19 +55,17 @@
 <script setup lang="ts">
 import StandardCenteredPage from 'components/StandardCenteredPage.vue';
 import SlimForm from 'components/SlimForm.vue';
-import { ref } from 'vue';
-import api from 'src/api/main';
-import { useAuthStore } from 'stores/auth-store';
-import { useRoute, useRouter } from 'vue-router';
-import { useI18n } from 'vue-i18n';
-import { resolveLocale } from 'src/i18n';
-import { useQuasar } from 'quasar';
+import {ref} from 'vue';
+import {useAuthStore} from 'stores/auth-store';
+import {useRoute, useRouter} from 'vue-router';
+import {useI18n} from 'vue-i18n';
+import {resolveLocale} from 'src/i18n';
+import {showApiErrorToast, showWarningToast} from 'src/utils';
 
 const authStore = useAuthStore();
 const router = useRouter();
 const route = useRoute();
 const i18n = useI18n({ useScope: 'global' });
-const quasar = useQuasar();
 
 const loginModel = ref({
   email: '',
@@ -84,7 +82,7 @@ const passwordVisible = ref(false);
  */
 async function tryLogin() {
   try {
-    await api.auth.login(authStore, loginModel.value);
+    await authStore.logInWithCredentials(loginModel.value);
 
     // Set the locale to the user's preferred locale.
     i18n.locale.value = resolveLocale(authStore.user?.preferences?.locale).value;
@@ -96,18 +94,9 @@ async function tryLogin() {
     await router.push(dest);
   } catch (error: any) {
     if (error.response && error.response.status === 401) {
-      quasar.notify({
-        message: i18n.t('loginPage.authFailed'),
-        type: 'warning',
-        position: 'top',
-      });
+      showWarningToast('loginPage.authFailed');
     } else {
-      quasar.notify({
-        message: i18n.t('generalErrors.apiError'),
-        type: 'negative',
-        position: 'top',
-      });
-      console.error(error);
+      showApiErrorToast(error);
     }
   }
 }
diff --git a/gymboard-app/src/pages/auth/UserSettingsPage.vue b/gymboard-app/src/pages/auth/UserSettingsPage.vue
index 3e63901..a80adaf 100644
--- a/gymboard-app/src/pages/auth/UserSettingsPage.vue
+++ b/gymboard-app/src/pages/auth/UserSettingsPage.vue
@@ -117,19 +117,19 @@ let initialPreferences: UserPreferences | null = null;
 const newPassword = ref('');
 
 onMounted(async () => {
-  // Redirect away from the page if the user isn't viewing their own settings.
   const userId = route.params.userId as string;
-  if (!authStore.user || authStore.user.id !== userId) {
+  if (authStore.user && authStore.user.id === userId) {
+    personalDetails.value = await api.auth.getMyPersonalDetails(authStore);
+    initialPersonalDetails = structuredClone(toRaw(personalDetails.value));
+
+    preferences.value = await api.auth.getMyPreferences(authStore);
+    initialPreferences = structuredClone(toRaw(preferences.value));
+
+    newPassword.value = '';
+  } else {
+    // Redirect away from the page if the user isn't viewing their own settings.
     await router.replace(`/users/${userId}`);
   }
-
-  personalDetails.value = await api.auth.getMyPersonalDetails(authStore);
-  initialPersonalDetails = structuredClone(toRaw(personalDetails.value));
-
-  preferences.value = await api.auth.getMyPreferences(authStore);
-  initialPreferences = structuredClone(toRaw(preferences.value));
-
-  newPassword.value = '';
 });
 
 const personalDetailsChanged = computed(() => {
diff --git a/gymboard-app/src/pages/user/UserPage.vue b/gymboard-app/src/pages/user/UserPage.vue
index 1d9874d..255bba2 100644
--- a/gymboard-app/src/pages/user/UserPage.vue
+++ b/gymboard-app/src/pages/user/UserPage.vue
@@ -83,7 +83,12 @@ const isOwnUser = ref(false);
 // re-render.
 watch(route, async (updatedRoute) => {
   if (updatedRoute.params.userId && updatedRoute.params.userId.length > 0) {
-    const userId = updatedRoute.params.userId[0];
+    let userId;
+    if (Array.isArray(updatedRoute.params.userId)) {
+      userId = updatedRoute.params.userId[0];
+    } else {
+      userId = updatedRoute.params.userId;
+    }
     if (!profile.value || (profile.value.id !== userId)) {
       await loadUser(userId);
     }
diff --git a/gymboard-app/src/stores/auth-store.ts b/gymboard-app/src/stores/auth-store.ts
index 32ab93d..a25776e 100644
--- a/gymboard-app/src/stores/auth-store.ts
+++ b/gymboard-app/src/stores/auth-store.ts
@@ -6,8 +6,10 @@
  */
 
 import { defineStore } from 'pinia';
-import { User } from 'src/api/main/auth';
+import {TokenCredentials, User} from 'src/api/main/auth';
+import api from 'src/api/main';
 import {AxiosRequestConfig} from 'axios';
+import Timeout = NodeJS.Timeout;
 
 interface AuthState {
   /**
@@ -20,18 +22,32 @@ interface AuthState {
    */
   token: string | null;
 
+  tokenRefreshTimer: Timeout | null;
+
   /**
    * The list of roles that the currently authenticated user has.
    */
   roles: string[];
 }
 
+const TOKEN_REFRESH_INTERVAL = 60 * 1000 * 25;
+
 export const useAuthStore = defineStore('authStore', {
   state: (): AuthState => {
-    return { user: null, token: null, roles: [] };
+    return { user: null, token: null, tokenRefreshTimer: null, roles: [] };
   },
   getters: {
+    /**
+     * Determines whether a user is currently logged in.
+     * @param state The store's state.
+     */
     loggedIn: (state) => state.user !== null && state.token !== null,
+    /**
+     * Gets the axios config that can be applied to requests to authenticate
+     * them as the current user. This will always return a valid request config
+     * even when the user is not logged in.
+     * @param state The store's state.
+     */
     axiosConfig(state): AxiosRequestConfig {
       if (this.token !== null) {
         return {
@@ -41,19 +57,80 @@ export const useAuthStore = defineStore('authStore', {
         return {};
       }
     },
+    /**
+     * Getter that returns true if a user is authenticated, and the user is
+     * an admin, meaning they have special access to additional data.
+     * @param state The store's state.
+     */
     isAdmin: state => state.roles.indexOf('admin') !== -1,
   },
   actions: {
     /**
-     * Logs a user into the application.
-     * @param user The user who was logged in.
-     * @param token The token that was obtained.
-     * @param roles The list of the user's roles.
+     * Attempts to log in with the given token credentials.
+     * @param credentials The credentials to use.
      */
-    logIn(user: User, token: string, roles: string[]) {
-      this.user = user;
-      this.token = token;
+    async logInWithCredentials(credentials: TokenCredentials) {
+      const token = await api.auth.getNewToken(credentials);
+      await this._logInWithToken(token);
+    },
+    /**
+     * Attempts to log in with a token that's stored in the browser's local
+     * storage.
+     */
+    async tryLogInWithStoredToken() {
+      const token = localStorage.getItem('auth-token');
+      if (token) {
+        this.token = token; // Temporarily set our token to the one that was stored, so we can use it to request a new one.
+        try {
+          await this.refreshToken();
+          if (this.token) { // If we were able to refresh the token, we can now go through with the login.
+            await this._logInWithToken(token);
+          }
+        } catch (error) {
+          console.warn('Could not log in with stored token: ', error);
+          this.logOut();
+        }
+      }
+    },
+    /**
+     * Initializes the auth state using a freshly-obtained token. This will
+     * populate all the necessary data to consider the user to be logged in,
+     * including fetching user data.
+     *
+     * Note: This method is intended to be used only internally.
+     * @param token The token to use.
+     */
+    async _logInWithToken(token: string) {
+      this.updateToken(token);
+      this.user = await api.auth.getMyUser(this);
+      const [personalDetails, preferences, roles] = await Promise.all([
+        api.auth.getMyPersonalDetails(this),
+        api.auth.getMyPreferences(this),
+        api.auth.getMyRoles(this)
+      ]);
+      this.user.personalDetails = personalDetails;
+      this.user.preferences = preferences;
       this.roles = roles;
+      if (this.tokenRefreshTimer) {
+        clearInterval(this.tokenRefreshTimer);
+      }
+      this.tokenRefreshTimer = setInterval(
+        () => this.refreshToken(),
+        TOKEN_REFRESH_INTERVAL
+      );
+    },
+    /**
+     * Refreshes the existing token used for authentication. If this fails,
+     * the auth state will reset to the nominal logged-out state.
+     */
+    async refreshToken() {
+      try {
+        const newToken = await api.auth.refreshToken(this);
+        this.updateToken(newToken);
+      } catch (error) {
+        console.error('Failed to refresh token: ', error);
+        this.logOut();
+      }
     },
     /**
      * Logs a user out of the application, resetting the auth state.
@@ -61,7 +138,12 @@ export const useAuthStore = defineStore('authStore', {
     logOut() {
       this.user = null;
       this.token = null;
+      if (this.tokenRefreshTimer) {
+        clearInterval(this.tokenRefreshTimer);
+      }
+      this.tokenRefreshTimer = null;
       this.roles = [];
+      localStorage.removeItem('auth-token');
     },
     /**
      * Updates the token that's stored for the currently authenticated user.
@@ -69,6 +151,7 @@ export const useAuthStore = defineStore('authStore', {
      */
     updateToken(token: string) {
       this.token = token;
+      localStorage.setItem('auth-token', this.token);
     }
   }
 });