FingerprintJS: Open-source browser fingerprinting library
Client-side JavaScript library for browser fingerprinting and visitor identification.
Learn more about FingerprintJS
FingerprintJS is a client-side JavaScript library that generates unique browser fingerprints by collecting and analyzing device and browser characteristics. The library aggregates signals from canvas rendering, audio processing, WebGL capabilities, installed fonts, screen properties, and various browser APIs to create a composite identifier. It processes these collected attributes through a hashing algorithm to produce a consistent visitor identifier that remains stable across page visits even without cookies. The fingerprinting technique operates entirely in the browser without requiring server-side processing, making it suitable for integration into web applications as a lightweight dependency. The library balances identification accuracy against the inherent variability of browser environments, where software updates or configuration changes can affect fingerprint stability.
Client-Side Fingerprinting
Fingerprints generate entirely in-browser using JavaScript with no server dependencies. Consistent identifiers persist across incognito modes and after clearing browser data, simplifying deployment for visitor tracking.
Open-Source MIT License
Full source code available on GitHub for inspection and modification. Integrate via NPM or CDN, or examine implementation details directly to understand fingerprinting methods.
Simplicity Over Accuracy
Uses only browser attributes without server-side analysis of IP addresses or behavioral patterns. Lower identification accuracy than commercial solutions, but enables zero-infrastructure deployment for basic visitor identification.
import FingerprintJS from '@fingerprintjs/fingerprintjs';
const fp = await FingerprintJS.load();
const result = await fp.get();
const visitorId = result.visitorId;
console.log('Visitor ID:', visitorId);Documentation update to reference v5 instead of v4 in README examples.
- –chore: Updated README.md to reference v5 instead of v4, ensuring documentation reflects the latest version and usage examples.
Major version update changing TypeScript compilation target from ES5 to ES2018.
- –Build Target Updated: The TypeScript compilation target has been changed from ES5 to ES2018.
Bug fix for handling special Infinity case in AudioBaseLatency component.
- –Handle special Infinity case in AudioBaseLatency component
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