---
source_url: "https://ddos-guard.net/terms/attacks/js-cookie-challenge"
title: "What Is JS Cookie Challenge? | Knowledge Base DDoS-Guard"
mirrored_at: 2026-08-04T12:31:44.618Z
host: ddos-guard.net
cited_in_42a: true
mirror_canonical: "https://index.42a.ai/ddos-guard.net/terms/attacks/js-cookie-challenge"
---

> **Original source:** https://ddos-guard.net/terms/attacks/js-cookie-challenge

Modern DDoS mitigation systems use this technique to separate legitimate users from bots. It authenticates users by sending a JavaScript request to a suspicious client. The client must execute the received JavaScript request and generate a cookie. The client then sends an HTTP request with the generated cookies as proof of its legitimacy.