# jackspirou/clientjs

Device information and digital fingerprinting written in pure JavaScript.

Repository: https://github.com/jackspirou/clientjs
Canonical: https://ross.abutalabs.com/products/clientjs
Homepage: http://clientjs.org
Language: JavaScript
License: Apache-2.0
License Family: permissive
Last push: 2023-01-08T17:39:54+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4688, "days_push": 1333, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2230, forks 335 (observed 2026-08-28T04:06:29.074080+00:00)

## What it is
ClientJS is a pure JavaScript library for browser device fingerprinting and device information gathering. It generates a 32-bit integer fingerprint from browser/device data points while also exposing individual attributes like OS, browser, screen resolution, and plugins.

## Use cases
- fingerprint browsers to identify returning visitors without cookies
- detect user's operating system, browser, and device type
- get screen resolution and color depth of client devices
- check browser plugin, font, and storage support
- generate a stable device ID for fraud detection
- collect client-side device analytics for a website

## When to choose
- you need cookieless visitor identification in pure JavaScript
- you want both a fingerprint hash and the underlying data points exposed
- you need a lightweight, dependency-free browser library

## When to avoid
- you need strong anti-fraud guarantees against modern anti-fingerprinting browsers
- you need server-side or mobile-native fingerprinting
- you need actively developed features - releases are infrequent

## Facets
- artifact type: library
- maturity: maintenance
- function: security, analytics
- domain: web-development, privacy, browser-extensions
- platform: browser, cross-platform
- tags: browser-fingerprinting, device-detection, user-agent, client-information, privacy, nodejs

## Member repositories
- jackspirou/clientjs (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:29.074080+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:44:38.446575+00:00, confidence not recorded.
  - readme: https://github.com/jackspirou/clientjs (fetched 2026-08-28T04:06:29.074080+00:00, sha e8308391731e)
  - homepage: http://clientjs.org (fetched 2026-08-29T10:25:13.691098+00:00, sha c57549b0e546)
  - registry_npm: https://registry.npmjs.org/clientjs (fetched 2026-08-29T10:25:13.694181+00:00, sha 0179b8553221)
- Data as of 2026-08-30T08:39:29.467469+00:00.