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Use case
Find Sites Using a JavaScript Library
Most JavaScript libraries leave an unmistakable trace in page source: a CDN URL, a versioned filename, or a global variable. Search that trace to find every site shipping the library — useful for adoption research, dependency auditing and finding sites on outdated (potentially vulnerable) versions.
Example footprints
jquery.min.js— jQueryreact-dom— Reactcdn.jsdelivr.net/unpkg.com— libraries loaded from a public CDN
How to do it
Search the library's filename or CDN path; use a regex to pin a version (e.g. a specific jquery-3. build). Open any result to see the exact reference in the full source.