diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1df67008..d60b79d4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,6 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - run: npx @biomejs/biome check .
       - name: Set up cargo cache
         uses: Swatinem/rust-cache@378c8285a4eaf12899d11bea686a763e906956af
       - run: cargo fmt --all -- --check
diff --git a/sqlpage/apexcharts.js b/sqlpage/apexcharts.js
index bb30b054..2e616186 100644
--- a/sqlpage/apexcharts.js
+++ b/sqlpage/apexcharts.js
@@ -1,6 +1,6 @@
 /* !include https://cdn.jsdelivr.net/npm/apexcharts@4.0.0/dist/apexcharts.min.js */
 
-sqlpage_chart = (function () {
+sqlpage_chart = (() => {
 
     function sqlpage_chart() {
         for (const c of document.querySelectorAll("[data-pre-init=chart]")) {
@@ -160,7 +160,7 @@ sqlpage_chart = (function () {
                 fillSeriesColor: false,
                 custom: (data.type === 'bubble' || data.type === 'scatter') ? bubbleTooltip : undefined,
                 y: {
-                    formatter: function (value) {
+                    formatter: (value) => {
                         if (is_timeseries && data.type === 'rangeBar') {
                             const d = new Date(value);
                             if (d.getHours() === 0 && d.getMinutes() === 0) return d.toLocaleDateString();
diff --git a/sqlpage/sqlpage.js b/sqlpage/sqlpage.js
index 039ea256..289644d6 100644
--- a/sqlpage/sqlpage.js
+++ b/sqlpage/sqlpage.js
@@ -32,7 +32,7 @@ function table_search_sort(el) {
     el,
     sort_keys: sort_buttons.map(b => {
       const sort_key = el.getElementsByClassName(b.dataset.sort)[0]?.textContent;
-      return { num: parseFloat(sort_key), str: sort_key };
+      return { num: Number.parseFloat(sort_key), str: sort_key };
     })
   }));
   function onSearch() {
@@ -96,7 +96,7 @@ function sqlpage_map() {
     onLeafletLoad();
   }
   function parseCoords(coords) {
-    return coords && coords.split(",").map(c => parseFloat(c));
+    return coords && coords.split(",").map(c => Number.parseFloat(c));
   }
   function onLeafletLoad() {
     is_leaflet_loaded = true;
@@ -107,7 +107,7 @@ function sqlpage_map() {
       const attribution = m.dataset.attribution;
       const map = L.map(m, { attributionControl: !!attribution });
       const zoom = m.dataset.zoom;
-      let center = parseCoords(m.dataset.center);
+      const center = parseCoords(m.dataset.center);
       if (tile_source) L.tileLayer(tile_source, { attribution, maxZoom }).addTo(map);
       map._sqlpage_markers = [];
       for (const marker_elem of m.getElementsByClassName("marker")) {
@@ -155,7 +155,7 @@ function sqlpage_map() {
     return L.marker(coords, options);
   }
   function createGeoJSONMarker(marker_elem, options) {
-    let geojson = JSON.parse(marker_elem.dataset.geojson);
+    const geojson = JSON.parse(marker_elem.dataset.geojson);
     if (options.color) {
       options.color = get_tabler_color(options.color) || options.color;
     }
@@ -193,7 +193,7 @@ function get_tabler_color(name) {
 }
 
 function load_scripts() {
-  let addjs = document.querySelectorAll("[data-sqlpage-js]");
+  const addjs = document.querySelectorAll("[data-sqlpage-js]");
   const existing_scripts = new Set([...document.querySelectorAll("script")].map(s => s.src));
   for (const el of addjs) {
     const js = new URL(el.dataset.sqlpageJs, window.location.href).href;
diff --git a/tests/end-to-end/official-site.spec.ts b/tests/end-to-end/official-site.spec.ts
index d5c3c6e9..89e5406c 100644
--- a/tests/end-to-end/official-site.spec.ts
+++ b/tests/end-to-end/official-site.spec.ts
@@ -99,21 +99,21 @@ test('table sorting', async ({ page }) => {
   // Test numeric sorting on id column
   await tableSection.getByRole('button', { name: 'id' }).click();
   let ids = await tableSection.locator('td.id').allInnerTexts();
-  let numericIds = ids.map(id => parseInt(id));
+  let numericIds = ids.map(id => Number.parseInt(id));
   const sortedIds = [...numericIds].sort((a, b) => a - b);
   expect(numericIds).toEqual(sortedIds);
 
   // Test reverse sorting
   await tableSection.getByRole('button', { name: 'id' }).click();
   ids = await tableSection.locator('td.id').allInnerTexts();
-  numericIds = ids.map(id => parseInt(id));
+  numericIds = ids.map(id => Number.parseInt(id));
   const reverseSortedIds = [...numericIds].sort((a, b) => b - a);
   expect(numericIds).toEqual(reverseSortedIds);
 
   // Test amount in stock column sorting
   await tableSection.getByRole('button', { name: 'Amount in stock' }).click();
-  let amounts = await tableSection.locator('td.Amount').allInnerTexts();
-  let numericAmounts = amounts.map(amount => parseInt(amount));
+  const amounts = await tableSection.locator('td.Amount').allInnerTexts();
+  const numericAmounts = amounts.map(amount => Number.parseInt(amount));
   const sortedAmounts = [...numericAmounts].sort((a, b) => a - b);
   expect(numericAmounts).toEqual(sortedAmounts);
 });