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.
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Websites using Underscore.js
653 hostnames in the PluginView corpus for this technology.
| Hostname | Last seen |
|---|---|
| stackoverflow.com | 8/3/2026 |
| cnn.com | 8/7/2026 |
| variety.com | 8/7/2026 |
| hollywoodreporter.com | 8/6/2026 |
| cornell.edu | 8/3/2026 |
Whole list · $45.71 (653 × $0.07)
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Underscore.js signature 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 and scores them against proprietary Underscore.js fingerprints. Rule bodies and identifiers are not published.
- 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. It does not bypass authentication or paywalls.
- What category is Underscore.js?
- Underscore.js is classified under JavaScript libraries in the PluginView directory.
- Does PluginView publish Underscore.js fingerprint rules?
- No. Detection uses proprietary fingerprint rules that are not published. Scan results explain matches in plain language without disclosing rule bodies or identifiers.
