What jQuery is
jQuery is a browser library for DOM manipulation and requests. It predates the component frameworks and is still loaded by a very large number of sites, frequently because a content management system theme or a plugin includes it rather than because the site was built around it.
How DNSTrace.dev detects it
Detection reads the final HTTPS response and the first bytes of its markup. One matching signal is reported as strong evidence; two or more independent signals are reported as confirmed.
a versioned jQuery script filename— A script source matching jquery, jquery.min or jquery-<version> in the markup.
What a detection proves
A jQuery build is loaded by the home document.
What it does not prove
Anything about the rest of the stack. jQuery is often a dependency of a theme or plugin rather than an architectural choice, and its presence says nothing about the server.
Common questions
Does jQuery mean the site is old?
No. Many current content management systems still ship it for plugin compatibility.
Is the version reported?
The filename often carries one, but it is self-reported and frequently a bundled or aliased build.
Compare with
ReactOpen source, maintained by Meta
Frontend framework
VueOpen source, the Vue project
Frontend framework
AngularOpen source, maintained by Google
Content management system
WordPressOpen source, WordPress Foundation
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