Third-party Resources

External hosts, JavaScript libraries and source maps used by a page

Free Online Tool

Third-party Resources — Complete Guide & Instructions

Map a page's external footprint — every third-party host referenced by scripts, stylesheets, images, fonts and iframes — plus client-side detection of common JavaScript libraries and any publicly referenced source maps.

How to Use Third-party Resources

  1. 1 Enter a full page URL.
  2. 2 Click Check — the HTML is fetched and every external reference extracted.
  3. 3 Review third-party hosts, detected libraries and source-map count.

Key Features & Capabilities

  • External hosts grouped by resource type with reference counts.
  • Detects jQuery, React, Vue, Bootstrap, Alpine, Lodash and more with versions.
  • Flags sourceMappingURL references.