ua-parser-js: UAParser.js: The Go-To User-Agent Tool for Teams That Build the Web

by faisalman · Agent Tool · ★ 10.2k

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Security audit verdict: SAFE · quality 58/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours. Full audit →

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

analyticsbot-detectionbrowser-detectionclient-hintsdevice-detectionmobile-detectionuser-agentuser-agent-parser

Quick Facts

Stars10,192
Forks1,216
LanguageJavaScript
CategoryAgent Tool
LicenseAGPL-3.0
Quality Score58/100
Open Issues15
Last Updated2026-09-29
Created2012-02-01
Platformsbrowser, cli, node
Est. Tokens~15k

About ua-parser-js

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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