thumbmarkjs/thumbmarkjs
A free, open-source javascript fingerprinting library observed · 2026-08-28
Health v2 · maintenance only
93/100
- Activity 99
- Release rhythm 99
- Longevity 70
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: 15
- age_days: 980
- days_rel: 8
- days_push: 7
- n_releases_24m: 30
Adoption not part of the score
1134 stars · 96 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
ThumbmarkJS is a free, MIT-licensed JavaScript browser fingerprinting library that generates a unique visitor identifier entirely client-side using signals like canvas, WebGL, and audio fingerprints. It is used for identifying returning visitors, fraud prevention, and bot detection, with an optional commercial API for higher accuracy and server-side signals.
Use cases
- identify returning anonymous visitors on a website
- detect browser fingerprint for fraud prevention
- detect bots in the browser
- generate a stable visitor ID without cookies
- add a browser-identity signal to payment fraud checks
- personalize content for anonymous visitors
- fingerprint browsers client-side without a backend
When to choose
- you need a free, open-source, client-side fingerprinting library with no backend required
- you want MIT-licensed, commercially usable fingerprinting with ~80% uniqueness
- you need a quick CDN or NPM drop-in for visitor identification
- you want to combine client signals with a paid API for 99%+ uniqueness, bot/VPN detection
When to avoid
- you need server-side fingerprinting - the library requires browser APIs and cannot run on the server
- you need guaranteed unique identification - client-only mode has ~80% uniqueness and higher collisions on Mac/Safari
- your users rely on anti-fingerprinting browsers or strict privacy tooling
- you need GDPR-consulted compliance guarantees without reviewing legal implications yourself
Facets
library · maturity active
security sdk developer-tools security web-development frontend privacy analytics browser browser-fingerprinting fraud-detection bot-detection visitor-identification canvas-fingerprinting audio-fingerprinting client-side gdpr web-server nodejs
7 sources
- readme: https://github.com/thumbmarkjs/thumbmarkjs · fetched 2026-08-28 · 6dc525fbb97b
- homepage: https://www.thumbmarkjs.com/ · fetched 2026-08-29 · 1107da247825
- site_page: https://docs.thumbmarkjs.com/ · fetched 2026-08-29 · 96464d7ec852
- site_page: https://docs.thumbmarkjs.com/docs/installation/usage-npm · fetched 2026-08-29 · 0a175b288633
- site_page: https://docs.thumbmarkjs.com/docs/installation/usage-import · fetched 2026-08-29 · 52cae2e3c680
- site_page: https://www.thumbmarkjs.com/content · fetched 2026-08-29 · 4647ef826096
- site_page: https://www.thumbmarkjs.com/pricing · fetched 2026-08-29 · 652c7ac2c452
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| thumbmarkjs/thumbmarkjs | main | 93 |
For agents
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Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem