How to Build a Website Tech Stack Scanner CLI in Go with Wappalyzergo

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Developers can build a command-line website technology scanner in Go using ProjectDiscovery's open-source Wappalyzergo library. The tool accepts a target URL, fetches the HTTP response, and fingerprints the site's tech stack — all within the terminal in under 50 lines of code. Once compiled, the CLI binary can be installed system-wide and run against any URL to detect technologies such as React, Nginx, or Cloudflare. The scanner supports extensions like JSON or CSV output, multi-target scanning, and category-grouped results via the FingerprintWithCats method. Common use cases include security reconnaissance, attack surface discovery, CI pipeline integration, and developer diagnostics.

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