uaBrowserBrowser Environment Detection

Detect browser, OS, and device type from User Agent strings. Node.js support. Zero dependencies.

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Comprehensive Detection

Browser name, version, rendering engine, OS, device type, CPU architecture — all in one parse.

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Detects 18+ major crawlers (Googlebot, Bingbot, GPTBot, ClaudeBot, etc.) with a generic fallback.

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Identifies HeadlessChrome, PhantomJS, Electron, Playwright, jsdom, and Selenium environments.

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Import only the detectors you need. Named exports keep your bundle lean.

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No runtime dependencies. Works in browser and Node.js. ~5KB gzipped.

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Full TypeScript definitions with precise literal union types for all return values.