FingerprintJS

Demo

Visit https://fingerprintjs.github.io/fingerprintjs to know your visitor identifier.

Now, try visiting the same page in private / incognito mode and notice how the visitor identifier remains the same!

Getting Started

<script>
  // Initialize the agent at application startup.
  // If you're using an ad blocker or Brave/Firefox, this import will not work.
  // Please use the NPM package instead: https://t.ly/ORyXk
  const fpPromise = import('https://openfpcdn.io/fingerprintjs/v4')
    .then(FingerprintJS => FingerprintJS.load())

  // Get the visitor identifier when you need it.
  fpPromise
    .then(fp => fp.get())
    .then(result => {
      // This is the visitor identifier:
      const visitorId = result.visitorId
      console.log(visitorId)
    })
</script>

Run this code

Limitations

Accuracy

Since FingerprintJS processes and generates the fingerprints from within the browser itself, the accuracy is limited (40% - 60%). For example, when 2 different users send requests using identical (i.e. same version, same vendor, same platform), browsers, FingerprintJS will not be able to tell these two browsers apart, primarily because the attribitutes from these browsers will be identical.

Security

Because of how the fingerprints are processed and generated from within the browser itself, they are vulnerable to spoofing and reverse engineering.

Get 99.5% accuracy

Fingerprint Identification is a closed-source, commercial device identification product designed for fraud detection, device identification, marketing attribution, and analytics. This product is an enhanced version of FingerprintJS and has been fully re-designed to solve the most challenging identification use cases. Its source is not available in this or any other public repository.

Fingerprint Identification is able to achieve 99.5% accuracy, because it processes the browser attributes on the server and also analyzes vast amounts of auxiliary data (e.g. IP addresses, time of visit patterns, URL changes, etc.). Because of these advanced matching techniques, Fingerprint Identification is able to reliably deduplicate different users that have identical devices. For a comprehensive list of advantages over FingerprintJS, please visit Fingerprint Identification vs. FingerprintJS.

Fingerprint Identification is available for Web, Android, iOS, and other platforms. Our plans start at $99 per month and include with them 20K API calls. You can easily get started by signing up for a free, no-obligation 14-day trial.