
Security News
NVD Concedes Inability to Keep Pace with Surging CVE Disclosures in 2025
Security experts warn that recent classification changes obscure the true scope of the NVD backlog as CVE volume hits all-time highs.
thumbmarkjs
Advanced tools
 
ThumbmarkJS is the world's second best browser fingerprinting JavaScript library. While not (yet?) as good, it's a free open source alternative to the market leading FingerprintJS. It is easy to use and easily extendable.
ThumbmarkJS is open source (MIT).
You can help this project by visiting the demo page that logs your fingerprint for analysis. The logged fingerprint data is only used to improve this library. Visit the page from the link: Show and log my fingerprint
The library works very well to distinguish common browsers.
<script src="https://cdn.thumbmarkjs.com/latest/Thumbmark.js"></script>
<script>
ThumbmarkJS.getFingerprint().then(
function(fp) {
console.log(fp);
}
);
</script>
<!-- or -->
<script>
import('https://cdn.thumbmarkjs.com/latest/Thumbmark.js')
.then(() => {
ThumbmarkJS.getFingerprint().then((fp) => { console.log(fp)})
})
</script>
You can also call ThumbmarkJS.getFingerprintData()
to get a full JSON object with all its components.
You can also get any previous version from the CDN by replacing latest
with the version number. Currently the URL would be
https://cdn.thumbmarkjs.com/0.11.4/Thumbmark.js
Installing from NPM:
npm install thumbmarkjs
and in your code
import { getFingerprint } from 'thumbmarkjs'
But bear in mind that the library is meant to be running in the browser. Let me know if the library fails on a server side import. However, getFingerprint()
is not meant to be called server side.
Clone this repo and then run
npm run install
npm run build
Simply going to the Show and log my fingerprint-page helps a lot. The logging is all anonymous and only used to develop this library. Let me know if you run into any errors by opening an issue. The discussion section is also open.
Test cases you can try:
if you see a fingerprint change when it shouldn't, you can use this JSON Diff Finder tool to check what causes the diff.
I wanted to create something that's easy to build, extend and use. If you're interested in how the library works, the structure is very simple.
Have a look at the technical_details
FAQs
This project has moved to [@thumbmarkjs/thumbmarkjs](https://www.npmjs.com/package/@thumbmarkjs/thumbmarkjs)
The npm package thumbmarkjs receives a total of 870 weekly downloads. As such, thumbmarkjs popularity was classified as not popular.
We found that thumbmarkjs demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Security experts warn that recent classification changes obscure the true scope of the NVD backlog as CVE volume hits all-time highs.
Security Fundamentals
Attackers use obfuscation to hide malware in open source packages. Learn how to spot these techniques across npm, PyPI, Maven, and more.
Security News
Join Socket for exclusive networking events, rooftop gatherings, and one-on-one meetings during BSidesSF and RSA 2025 in San Francisco.