diff --git a/web_interface/static/v3/app.js b/web_interface/static/v3/app.js
index 9580100d..4fe1ed46 100644
--- a/web_interface/static/v3/app.js
+++ b/web_interface/static/v3/app.js
@@ -45,7 +45,7 @@ document.body.addEventListener('htmx:afterRequest', function(event) {
             if (data.message) {
                 showNotification(data.message, data.status || 'info');
             }
-        } catch (e) {
+        } catch {
             // Not JSON, ignore
         }
     }
@@ -65,8 +65,7 @@ window.reconnectSSE = function() {
     if (window.displaySource) {
         window.displaySource.close();
         window.displaySource = new EventSource('/api/v3/stream/display');
-        window.displaySource.onmessage = function(event) {
-            const data = JSON.parse(event.data);
+        window.displaySource.onmessage = function() {
             // Handle display updates
         };
     }
diff --git a/web_interface/static/v3/js/plugins/api_client.js b/web_interface/static/v3/js/plugins/api_client.js
index f442dcd8..427cc1e0 100644
--- a/web_interface/static/v3/js/plugins/api_client.js
+++ b/web_interface/static/v3/js/plugins/api_client.js
@@ -40,7 +40,7 @@ const RequestThrottler = {
         // Create throttled request with abort support
         let abortController = null;
         const promise = new Promise((resolve, reject) => {
-            const timeoutId = setTimeout(async () => {
+            setTimeout(async () => {
                 try {
                     const result = await fn();
                     // Cache successful GET requests
diff --git a/web_interface/static/v3/js/widgets/custom-feeds.js b/web_interface/static/v3/js/widgets/custom-feeds.js
index d37ec62c..b50dd37c 100644
--- a/web_interface/static/v3/js/widgets/custom-feeds.js
+++ b/web_interface/static/v3/js/widgets/custom-feeds.js
@@ -364,7 +364,6 @@
             // Re-index remaining rows
             const rows = tbody.querySelectorAll('.custom-feed-row');
             rows.forEach((r, index) => {
-                const oldIndex = r.getAttribute('data-index');
                 r.setAttribute('data-index', index);
                 // Update all input names with new index
                 r.querySelectorAll('input, button').forEach(input => {
diff --git a/web_interface/static/v3/js/widgets/day-selector.js b/web_interface/static/v3/js/widgets/day-selector.js
index 1280f180..7ce18598 100644
--- a/web_interface/static/v3/js/widgets/day-selector.js
+++ b/web_interface/static/v3/js/widgets/day-selector.js
@@ -91,7 +91,7 @@
             const xOptions = config['x-options'] || config['x_options'] || {};
             const requestedFormat = xOptions.format || 'long';
             // Validate format exists in DAY_LABELS, default to 'long' if not
-            const format = DAY_LABELS.hasOwnProperty(requestedFormat) ? requestedFormat : 'long';
+            const format = Object.prototype.hasOwnProperty.call(DAY_LABELS, requestedFormat) ? requestedFormat : 'long';
             const layout = xOptions.layout || 'horizontal';
             const showSelectAll = xOptions.selectAll !== false;
 
diff --git a/web_interface/static/v3/js/widgets/file-upload.js b/web_interface/static/v3/js/widgets/file-upload.js
index bc2cfa54..23e40886 100644
--- a/web_interface/static/v3/js/widgets/file-upload.js
+++ b/web_interface/static/v3/js/widgets/file-upload.js
@@ -294,7 +294,7 @@
         if (fileType !== 'json') {
             formData.append('plugin_id', pluginId);
         }
-        validFiles.forEach(file => formData.append('files', file));
+        validFiles.forEach(file => { formData.append('files', file); });
         
         try {
             const response = await fetch(customUploadEndpoint, {
@@ -741,7 +741,7 @@
         try {
             const date = new Date(dateString);
             return date.toLocaleDateString() + ' ' + date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
-        } catch (e) {
+        } catch {
             return dateString;
         }
     };
diff --git a/web_interface/static/v3/js/widgets/notification.js b/web_interface/static/v3/js/widgets/notification.js
index 16b4a79e..5fa43f0d 100644
--- a/web_interface/static/v3/js/widgets/notification.js
+++ b/web_interface/static/v3/js/widgets/notification.js
@@ -199,7 +199,7 @@
      */
     function clearAll() {
         const ids = [...activeNotifications];
-        ids.forEach(id => removeNotification(id, true));
+        ids.forEach(id => { removeNotification(id, true); });
     }
 
     // Register the widget
diff --git a/web_interface/static/v3/js/widgets/schedule-picker.js b/web_interface/static/v3/js/widgets/schedule-picker.js
index 80cc058f..df5ff550 100644
--- a/web_interface/static/v3/js/widgets/schedule-picker.js
+++ b/web_interface/static/v3/js/widgets/schedule-picker.js
@@ -174,7 +174,6 @@
             const xOptions = config['x-options'] || config['x_options'] || {};
             const showModeToggle = xOptions.showModeToggle !== false;
             const showEnableToggle = xOptions.showEnableToggle !== false;
-            const compactMode = xOptions.compactMode === true;
 
             const schedule = normalizeSchedule(value);
 
diff --git a/web_interface/static/v3/js/widgets/select-dropdown.js b/web_interface/static/v3/js/widgets/select-dropdown.js
index a62f895a..cdbc5e68 100644
--- a/web_interface/static/v3/js/widgets/select-dropdown.js
+++ b/web_interface/static/v3/js/widgets/select-dropdown.js
@@ -69,7 +69,6 @@
             const enumValues = config.enum || xOptions.options || [];
             const placeholder = xOptions.placeholder || 'Select...';
             const labels = xOptions.labels || {};
-            const icons = xOptions.icons || {};
             const disabled = xOptions.disabled === true;
             const required = xOptions.required === true;
 
diff --git a/web_interface/static/v3/js/widgets/timezone-selector.js b/web_interface/static/v3/js/widgets/timezone-selector.js
index f715d365..b567db8b 100644
--- a/web_interface/static/v3/js/widgets/timezone-selector.js
+++ b/web_interface/static/v3/js/widgets/timezone-selector.js
@@ -358,7 +358,7 @@
                     });
                     timeEl.textContent = formatter.format(now);
                     previewEl.classList.remove('hidden');
-                } catch (e) {
+                } catch {
                     previewEl.classList.add('hidden');
                 }
             }