Detect SockJS
SockJS is a browser-based JavaScript library that offers a WebSocket-like communication interface for applications.
Detection looks at script sources, javascript globals across 4 fingerprint rules among the site's public responses.
01
Websites using SockJS
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02
Signal classes
PluginView evaluates public page signals in these classes when identifying SockJS. Individual fingerprint rule bodies are proprietary and are not published.
- Script sources
- JavaScript globals
03
Example public indicators for SockJS
Illustrative indicators derived from public catalog metadata for SockJS. A live scan may match additional proprietary rules beyond these examples.
- sockjs-0.0?.min?.js
- 0.0/?sockjs.min?.js
- SockJS.CLOSED
- SockJS.version:
04
What a detection means
- Establishes
- One or more public signals on the scanned page matched a known SockJS signature (4 rules) at the time of the scan.
- Does not establish
- A sitewide install of SockJS, an active vendor contract, exclusive use, or that SockJS is still in place today.
05
How to check a site for SockJS
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest SockJS signals.
- 2. PluginView reads only public responses (script sources, javascript globals) and scores them against the SockJS signature set (4 rules).
- 3. Review the confidence score and text explanation for SockJS on the results page.
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FAQ: detecting SockJS
- Can PluginView detect SockJS without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for SockJS — typically script sources, javascript globals. It does not bypass authentication or paywalls.
- What category is SockJS?
- SockJS is classified under JavaScript libraries in the PluginView directory.
- How many fingerprint rules cover SockJS?
- This reference currently tracks 4 fingerprint rules across script sources, javascript globals. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses SockJS?
- Illustrative public indicators for SockJS include sockjs-0.0?.min?.js; 0.0/?sockjs.min?.js; SockJS.CLOSED. A live scan may match additional proprietary rules beyond these examples.
