Detect core-js
core-js is a modular standard library for JavaScript, with polyfills for cutting-edge ECMAScript features.
Detection looks at javascript globals across 5 fingerprint rules among the site's public responses.
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Websites using core-js
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02
Signal classes
PluginView evaluates public page signals in these classes when identifying core-js. Individual fingerprint rule bodies are proprietary and are not published.
- JavaScript globals
03
Example public indicators for core-js
Illustrative indicators derived from public catalog metadata for core-js. A live scan may match additional proprietary rules beyond these examples.
- __core-js_shared__
- __core-js_shared__.versions.0.version: .
- _babelPolyfill
- core
- core.version: .
04
What a detection means
- Establishes
- One or more public signals on the scanned page matched a known core-js signature (5 rules) at the time of the scan.
- Does not establish
- A sitewide install of core-js, an active vendor contract, exclusive use, or that core-js is still in place today.
05
How to check a site for core-js
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest core-js signals.
- 2. PluginView reads only public responses (javascript globals) and scores them against the core-js signature set (5 rules).
- 3. Review the confidence score and text explanation for core-js on the results page.
06
FAQ: detecting core-js
- Can PluginView detect core-js without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for core-js — typically javascript globals. It does not bypass authentication or paywalls.
- What category is core-js?
- core-js is classified under JavaScript libraries in the PluginView directory.
- How many fingerprint rules cover core-js?
- This reference currently tracks 5 fingerprint rules across javascript globals. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses core-js?
- Illustrative public indicators for core-js include __core-js_shared__; __core-js_shared__.versions.0.version: .; _babelPolyfill. A live scan may match additional proprietary rules beyond these examples.
