fingerprintjs/fingerprintjs
The most advanced free and open-source browser fingerprinting library observed · 2026-08-28
Health v2 · maintenance only
86/100
- Activity 96
- Release rhythm 66
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 40.0
- age_days: 4221
- days_rel: 148
- days_push: 24
- n_releases_24m: 9
Adoption not part of the score
28354 stars · 2611 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
FingerprintJS is an open-source, client-side browser fingerprinting library that queries browser attributes and computes a hashed visitor identifier. Unlike cookies or local storage, the identifier remains stable in incognito mode and after browser data is purged.
Use cases
- identify returning visitors without cookies
- detect users in incognito or private browsing mode
- prevent duplicate signups and trial abuse
- flag suspicious or fraudulent traffic client-side
- generate a stable device identifier for analytics
- detect banned users returning to a site
When to choose
- you need a free, MIT-licensed, client-side visitor identifier
- you want fingerprinting that works in incognito mode without a paid service
- you need a lightweight npm or CDN library for browser identification
When to avoid
- you need server-side signals like VPN, bot, or emulator detection (use Fingerprint Pro)
- you require the highest long-term identifier accuracy with fuzzy matching
- you need mobile native identification in iOS or Android apps
- your use case forbids fingerprinting, e.g. Google Analytics integration
Facets
library · maturity active
security sdk developer-tools security web-development privacy frontend browser cross-platform browser-fingerprinting visitor-identification fraud-detection incognito-detection client-side typescript nodejs
10 sources
- readme: https://github.com/fingerprintjs/fingerprintjs · fetched 2026-08-28 · 878ec99ed996
- homepage: https://fingerprint.com/github/ · fetched 2026-08-29 · 9cfed3e866ea
- site_page: https://docs.fingerprint.com · fetched 2026-08-29 · d3ff8680d17d
- site_page: https://docs.fingerprint.com/docs/fingerprintjs-pro-google-tag-manager · fetched 2026-08-29 · 1e1d8848d195
- site_page: https://docs.fingerprint.com/docs/react · fetched 2026-08-29 · 01c738dd6711
- site_page: https://docs.fingerprint.com/docs/fingerprintjs-pro-and-chrome-extension · fetched 2026-08-29 · 7b71123933c7
- site_page: https://docs.fingerprint.com/docs/angular · fetched 2026-08-29 · ba77c9cc98d9
- site_page: https://docs.fingerprint.com/docs/flutter · fetched 2026-08-29 · b8e7537ec815
- site_page: https://fingerprint.com/pricing · fetched 2026-08-29 · 35aa3e076ec9
- site_page: https://fingerprint.com/integrations · fetched 2026-08-29 · b28d069342be
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| fingerprintjs/fingerprintjs | main | 86 |
For agents
markdown · JSON · MCP: product_card(name="fingerprintjs/fingerprintjs")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem