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To migrate your implementation from FingerprintJS to Fingerprint Pro:
  1. Determine your FingerprintJS version if you are not sure.
  2. Follow the migration instructions below specific to your version.

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Determine your FingerprintJS version

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NPM installation

If you installed FingerprintJS using npm, then your application’s package.json will include an entry for either @fingerprintjs/fingerprintjs or @fingerprintjs/fingerprintjs2 along with the exact version that is being used. 
"dependencies": {
    "@fingerprintjs/fingerprintjs": "^x.y.z"
}

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CDN installation

If your application loads FingerprintJS using CDN, then the path specified in script or import will contain the version of FingerprintJS that is being used.

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FingerprintJS v2.x

If the path in the script tag includes /fingerprintjs2@2/ , then your application uses FingerprintJS v2.x. 
<script src="https://cdn.jsdelivr.net/npm/fingerprintjs2@2/dist/fingerprint2.min.js"></script>

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FingerprintJS v3.x and higher

The path segment /vN/ in script or import statements indicates the version of FingerprintJS that is being used. In the below example, the version used is v4. 
const fpPromise = import('https://openfpcdn.io/fingerprintjs/v4')

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Migrating from FingerprintJS v2 to Pro

Please see Migrating from FingerprintJS v2 to Pro.

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Migrating from FingerprintJS v3 (open-source) to Pro

You can migrate from FingerprintJS v3 (open-source) to Fingerprint Pro in 30 seconds:
  1. Sign up on dashboard.fingerprint.com/signup, create an account, and get your Public API key.
  2. In your package.json or import statement, change the @fingerprintjs/fingerprintjs package to @fingerprintjs/fingerprintjs-pro:
Run:
npm remove @fingerprintjs/fingerprintjs
npm install @fingerprintjs/fingerprintjs-pro

And replace the package name in your JavaScript/TypeScript code:
- import FingerprintJS from '@fingerprintjs/fingerprintjs'
+ import FingerprintJS from '@fingerprintjs/fingerprintjs-pro'
  1. Add the public API key to the FingerprintJS.load() configuration:
That’s it, your visitor ID has a pro-level accuracy of 99.5% now.

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Migrating from FingerprintJS v4 (source-available) to Pro

How to upgrade from FingerprintJS v4 to Fingerprint Identification in 30 seconds:
  1. Sign up on dashboard.fingerprint.com/signup, create an account, and get your Public API key.
  2. Change the @fingerprintjs/fingerprintjs package to @fingerprintjs/fingerprintjs-pro:
Run:
npm remove @fingerprintjs/fingerprintjs
npm install @fingerprintjs/fingerprintjs-pro

And replace the package name in your JavaScript/TypeScript code:
- import FingerprintJS from '@fingerprintjs/fingerprintjs'
+ import FingerprintJS from '@fingerprintjs/fingerprintjs-pro'
  1. Add the public API key to the FingerprintJS.load() configuration:
That’s it, your visitor ID has an industry-leading accuracy now.

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What’s next

As a Fingerprint Pro user, you now have access to various resources not available for FingerprintJS: