diff --git a/README.md b/README.md
index 968c73a..e81b376 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ AI-powered formatting, labeling, and PR summaries for Python, Swift, and Markdow
 
 - **Python Code:** Formatted using [Ruff](https://github.com/astral-sh/ruff), an extremely fast Python linter and formatter
 - **Python Docstrings:** Google-style formatting enforced with Ultralytics Python docstring formatter (optional)
+- **JavaScript/TypeScript:** Formatted with [Biome](https://biomejs.dev/), an extremely fast formatter for JS, TS, JSX, TSX, and JSON (optional, auto-detected via `biome.json`)
 - **Markdown Files:** Styled with [Prettier](https://github.com/prettier/prettier) to ensure consistent documentation appearance
 - **Swift Code:** Formatted with [`swift-format`](https://github.com/swiftlang/swift-format) _(requires `macos-latest` runner)_
 - **Spell Check:** Common misspellings caught using [codespell](https://github.com/codespell-project/codespell)
@@ -82,6 +83,7 @@ jobs:
           labels: true # Auto-label issues/PRs using AI
           python: true # Format Python with Ruff
           python_docstrings: false # Format Python docstrings (default: false)
+          biome: true # Format JS/TS with Biome (auto-detected via biome.json)
           prettier: true # Format YAML, JSON, Markdown, CSS
           swift: false # Format Swift (requires macos-latest)
           dart: false # Format Dart/Flutter
diff --git a/action.yml b/action.yml
index a1405e3..d123a9f 100644
--- a/action.yml
+++ b/action.yml
@@ -26,6 +26,10 @@ inputs:
     description: "Run Markdown formatting (deprecated in favor of prettier)"
     required: false
     default: "false"
+  biome:
+    description: "Run Biome formatting"
+    required: false
+    default: "false"
   prettier:
     description: "Run Prettier formatting for JavaScript, JSX, Angular, Vue, Flow, TypeScript, CSS, HTML, JSON, GraphQL, Markdown, YAML"
     required: false
@@ -171,6 +175,19 @@ runs:
       shell: bash
       continue-on-error: true
 
+    # Biome (JavaScript, TypeScript, JSON, JSX, TSX) ------------------------------------------------------------------
+    - name: Run Biome
+      if: (github.event_name == 'pull_request' || github.event_name == 'pull_request_target') && inputs.biome == 'true' && (github.event.action == 'opened' || github.event.action == 'synchronize')
+      run: |
+        if [ -f "biome.json" ] || [ -f "biome.jsonc" ]; then
+          npm install --global @biomejs/biome@latest
+          npx biome check --write --unsafe --line-width 120 .
+        else
+          echo "⚠️  No biome.json or biome.jsonc found, skipping Biome formatting"
+        fi
+      shell: bash
+      continue-on-error: true
+
     # Prettier (JavaScript, JSX, Angular, Vue, Flow, TypeScript, CSS, HTML, JSON, GraphQL, Markdown, YAML) -------------
     - name: Run Prettier
       if: (github.event_name == 'pull_request' || github.event_name == 'pull_request_target') && (inputs.prettier == 'true' || inputs.markdown == 'true') && (github.event.action == 'opened' || github.event.action == 'synchronize')