diff --git a/content.js b/content.js
index ff44d06..051d711 100644
--- a/content.js
+++ b/content.js
@@ -2209,8 +2209,10 @@ class YTMBlockController {
    * Sanitizes and normalizes artist name values.
    */
   normalizeArtist(name) {
-    if (!name) return '';
-    return name.trim().toLowerCase();
+    if (!name || typeof name !== 'string') return '';
+    return name.trim().toLowerCase()
+      .replace(/\s+/g, ' ')
+      .replace(/[^\w\s-]/gi, '');
   }
 
   // --- CORE PLAYER EXTRACTION METHODS ---
@@ -2795,5 +2797,11 @@ class YTMBlockController {
 }
 
 // Instantiate and initialize the controller
-const ytmBlockController = new YTMBlockController();
-ytmBlockController.init();
+if (typeof window !== 'undefined') {
+  const ytmBlockController = new YTMBlockController();
+  ytmBlockController.init();
+}
+
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = { YTMBlockController };
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..25cc70a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "ytm-block",
+  "version": "1.2.0",
+  "description": "YouTube Music track, artist, and album blocking extension",
+  "scripts": {
+    "test": "node --test"
+  },
+  "private": true,
+  "license": "MIT"
+}
diff --git a/tests/normalizeArtist.test.js b/tests/normalizeArtist.test.js
new file mode 100644
index 0000000..f69974c
--- /dev/null
+++ b/tests/normalizeArtist.test.js
@@ -0,0 +1,40 @@
+const test = require('node:test');
+const assert = require('node:assert');
+
+// Require YTMBlockController from content.js
+const { YTMBlockController } = require('../content.js');
+
+test('YTMBlockController - normalizeArtist', async (t) => {
+  const controller = new YTMBlockController();
+
+  await t.test('handles empty, null, and undefined values', () => {
+    assert.strictEqual(controller.normalizeArtist(null), '');
+    assert.strictEqual(controller.normalizeArtist(undefined), '');
+    assert.strictEqual(controller.normalizeArtist(''), '');
+  });
+
+  await t.test('normalizes standard artist names (lowercasing and whitespace trimming)', () => {
+    assert.strictEqual(controller.normalizeArtist('Dua Lipa'), 'dua lipa');
+    assert.strictEqual(controller.normalizeArtist('  Coldplay  '), 'coldplay');
+    assert.strictEqual(controller.normalizeArtist('THE WEEKND'), 'the weeknd');
+  });
+
+  await t.test('collapses multiple internal whitespaces', () => {
+    assert.strictEqual(controller.normalizeArtist('Taylor   Swift'), 'taylor swift');
+    assert.strictEqual(controller.normalizeArtist(' Kendrick \t Lamar \n '), 'kendrick lamar');
+  });
+
+  await t.test('removes special characters except hyphens and spaces', () => {
+    assert.strictEqual(controller.normalizeArtist('P!nk'), 'pnk');
+    assert.strictEqual(controller.normalizeArtist('Ke$ha'), 'keha');
+    assert.strictEqual(controller.normalizeArtist('AC/DC'), 'acdc');
+    assert.strictEqual(controller.normalizeArtist('Jay-Z'), 'jay-z');
+    assert.strictEqual(controller.normalizeArtist('Panic! At The Disco'), 'panic at the disco');
+  });
+
+  await t.test('handles non-string values gracefully', () => {
+    assert.strictEqual(controller.normalizeArtist(123), '');
+    assert.strictEqual(controller.normalizeArtist({}), '');
+    assert.strictEqual(controller.normalizeArtist([]), '');
+  });
+});