PageSourceSearch

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PageSourceSearch is a search engine over the source code websites serve: the raw HTML of their pages and the first-party JavaScript they load. Type an exact string or a .NET regular expression and get every crawled site that contains it, grouped by domain, with each match highlighted in the stored file. Use it to see how other sites call an API or use a snippet, to find every site still serving a malicious script or a vulnerable version string, or to link sites that share an analytics or tag-manager ID. Library code such as jQuery or React is set aside, so results reflect each site's own code. Free to use, no account needed.