If you have been evaluating Fingerprint, this is a practical note about where to start.

The free plan covers 100,000 API calls per month. No credit card needed. No procurement process. You can sign up, install the SDK, and have your first visitor IDs flowing into your system within a single afternoon.

The integration itself is five lines:

import FingerprintJS from '@fingerprintjs/fingerprintjs-pro';
const fp = await FingerprintJS.load({ apiKey: 'YOUR_KEY' });
const result = await fp.get();
// result.visitorId is stable across sessions and VPNs

The visitor ID that comes back is stable across browser resets, incognito mode, VPN changes, and cookie clears. You pass it to your backend on login, registration, payment, or any event you want to protect. From there, you decide what to do with the signal.

The documentation covers every common integration pattern, including REST API, webhooks, server-side verification, and mobile SDKs. If you hit a question, the engineering team responds in the Slack community within a few hours.

Full docs at fingerprint.com/docs

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