Develop Cross-Browser Fingerprinting Library in JavaScript

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  • Proposals: 2
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  • #656852
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Haresh D.Mahabub I. have already sent a proposal.
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Experience Level: Expert
Estimated project duration: 1 - 2 weeks
General information for the website: This is a library, not a website.
Description of requirements/features: I'm looking for someone to develop a persistent cross-browser fingerprinting script in JavaScript. That is to say the library should determine a 32-bit string to identify a given user based on the features of their browser and operating system. See more about browser fingerprinting here (

The only dependency should be EverCookie ( . It should be as simplistic to use as fingerprintJS (

See this site ( which has implemented a cross-browser fingerprint as well as fingerprintJS for starting points.

Ideally, the object returned should have 2 members:
-currentFingerprint - the current browser fingerprint of the user
-knownFingerprints - and an array with all known fingerprints for that given user.

If the user somehow blocks EverCookie, the script should still return the current fingerprint.

The code will need to be submitted with an output of a series of tests across at least 5 machines and 3 browsers per machine that shows the validity of the fingerprint and its ability to identify a machine across multiple browsers. I'll also run the test on my side.

The deliverables will be:
-JavaScript library
-An example implementation
-The test results
Extra notes:

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