Detect Express
Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Detection looks at response headers, cookies across 2 fingerprint rules among the site's public responses.
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Websites using Express
Loading website list…
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Signal classes
PluginView evaluates public page signals in these classes when identifying Express. Individual fingerprint rule bodies are proprietary and are not published.
- Response headers
- Cookies
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Example public indicators for Express
Illustrative indicators derived from public catalog metadata for Express. A live scan may match additional proprietary rules beyond these examples.
- x-powered-by: Express,
- connect.sid
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Express signature (2 rules) at the time of the scan.
- Does not establish
- A sitewide install of Express, an active vendor contract, exclusive use, or that Express is still in place today.
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How to check a site for Express
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Express signals.
- 2. PluginView reads only public responses (response headers, cookies) and scores them against the Express signature set (2 rules).
- 3. Review the confidence score and text explanation for Express on the results page.
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Commonly implies
A confirmed Express match also implies these technologies are present.
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FAQ: detecting Express
- Can PluginView detect Express without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Express — typically response headers, cookies. It does not bypass authentication or paywalls.
- What category is Express?
- Express is classified under Web frameworks, Web servers in the PluginView directory.
- How many fingerprint rules cover Express?
- This reference currently tracks 2 fingerprint rules across response headers, cookies. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses Express?
- Illustrative public indicators for Express include x-powered-by: Express,; connect.sid. A live scan may match additional proprietary rules beyond these examples.
