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Arcjet · Concept

Fingerprinting

Arcjet fingerprints requests so it can recognize the same client across requests. By default, the fingerprint uses the client IP, but you can combine other request characteristics.

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Syntax

characteristics: ["ip.src", "http.request.headers[\"x-api-key\"]"]

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  • Built-in characteristics
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Source: Arcjet fingerprints. Checked 2026-11-03.