diff --git a/assets/js/tracking.js b/assets/js/tracking.js
index 43d8b93..b27e242 100644
--- a/assets/js/tracking.js
+++ b/assets/js/tracking.js
@@ -3,6 +3,7 @@
  * A JavaScript file for analytic tracking.
  */
 
+
 import * as params from '@params';
 
 const cookiebanner = params.cookieConsent;
@@ -12,6 +13,8 @@ const matomoTrackingApiUrl = 'https://' + params.piwikTrackerUrl + '/matomo.php'
 const googleAnalytics = params.GoogleAnalytics;
 
 if (idSite) {
+  // biome-ignore lint/style/useConst: Google code.
+  // biome-ignore lint/suspicious/noAssignInExpressions: Google code.
   let _paq = window._paq = window._paq || [];
 
   if (cookiebanner) {
diff --git a/biome.json b/biome.json
new file mode 100644
index 0000000..384118e
--- /dev/null
+++ b/biome.json
@@ -0,0 +1,41 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true,
+    "defaultBranch": "main"
+  },
+  "files": {
+    "ignoreUnknown": true,
+    "include": ["assets/**/*.js"],
+    "ignore": ["**/*.min.js", "assets/libs/**/*.js"]
+
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space"
+  },
+  "organizeImports": {
+    "enabled": true
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "complexity": {
+        "noForEach": "off",
+        "useArrowFunction": "off"
+      },
+      "style": {
+        "useTemplate": "off"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single"
+    },
+    "globals": ["define", "htmx", "jQuery", "Alpine"]
+  }
+}
diff --git a/package.json b/package.json
index c3d122b..d24005b 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,9 @@
   "description": "The node.js requirements to lint this project.",
   "scripts": {
     "lint-theme:css": "stylelint \"assets/sass/**/*.scss\"",
-    "lint-theme:js": "",
+    "lint-theme:js": "biome check",
     "lint-project:css": "stylelint \"../../assets/sass/**/*.scss\"",
-    "lint-project:js": "",
+    "lint-project:js": "biome check \"../../assets/js/**/*.js\"",
     "lint-theme": "npm run lint-theme:css && npm run lint-theme:js",
     "lint-project": "npm run lint-project:css && npm run lint-project:js",
     "lint:css": "npm run lint-theme:css && npm run lint-project:css",