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Reverse Engineering Vercel's BotID


Vercel recently announced BotID, an anti-bot meant to protect against bots without requiring manual intervention. This post reverse-engineers the script and takes a peek inside.

They help stop credential stuffing attacks, block denial-of-service attempts, and keep bad faith scrapers from inflating hosting costs 2(especially in the era of AI). Vercel recently announced BotID, "an invisible CAPTCHA that protects against sophisticated bots without showing visible challenges or requiring manual intervention". Both modes rely on fingerprinting and client-side data collection, reinforcing the broader trend: anti-bots are increasingly opaque, data-hungry, and can skew toward a narrow definition of what a “normal” user is.

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BotID