Fingerprint — React

Integrate Fingerprint into a React app to identify visitors: initialize the agent once at startup, then ask it for the visitor's visitor_id and a single-use event_id wherever you need it (on load, or on an action like login or checkout).

Docs: https://docs.fingerprint.com/docs/react · JS Agent v4: https://docs.fingerprint.com/reference/js-agent-v4

Package

@fingerprint/react — install the latest version. (Preact uses the same package. For plain HTML or an unsupported framework, use fingerprint-javascript and @fingerprint/agent instead.)

Env var

• FINGERPRINT_PUBLIC_API_KEY — the public key, safe to ship to the browser.

Bundlers only expose prefixed vars to client code — map the key to the bundler's convention:

• Vite: VITE_FINGERPRINT_PUBLIC_API_KEY → import.meta.env.VITE_...
• Create React App: REACT_APP_FINGERPRINT_PUBLIC_API_KEY → process.env.REACT_APP_... Never expose FINGERPRINT_SECRET_API_KEY to the frontend.