Detect Underscore.js
Underscore.js is a JavaScript library which provides utility functions for common programming tasks. It is comparable to features provided by Prototype.js and the Ruby language, but opts for a functional programming design instead of extending object prototypes.
Detection looks at script sources, javascript globals across 3 fingerprint rules among the site's public responses.
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Websites using Underscore.js
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Signal classes
PluginView evaluates public page signals in these classes when identifying Underscore.js. Individual fingerprint rule bodies are proprietary and are not published.
- Script sources
- JavaScript globals
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Example public indicators for Underscore.js
Illustrative indicators derived from public catalog metadata for Underscore.js. A live scan may match additional proprietary rules beyond these examples.
- underscore.*.js?ver=?
- _.VERSION: .
- _.restArguments
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Underscore.js signature (3 rules) at the time of the scan.
- Does not establish
- A sitewide install of Underscore.js, an active vendor contract, exclusive use, or that Underscore.js is still in place today.
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How to check a site for Underscore.js
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Underscore.js signals.
- 2. PluginView reads only public responses (script sources, javascript globals) and scores them against the Underscore.js signature set (3 rules).
- 3. Review the confidence score and text explanation for Underscore.js on the results page.
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FAQ: detecting Underscore.js
- Can PluginView detect Underscore.js without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Underscore.js — typically script sources, javascript globals. It does not bypass authentication or paywalls.
- What category is Underscore.js?
- Underscore.js is classified under JavaScript libraries in the PluginView directory.
- How many fingerprint rules cover Underscore.js?
- This reference currently tracks 3 fingerprint rules across script sources, javascript globals. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses Underscore.js?
- Illustrative public indicators for Underscore.js include underscore.*.js?ver=?; _.VERSION: .; _.restArguments. A live scan may match additional proprietary rules beyond these examples.
