Bot Detection
Bot detection is the set of techniques websites use to tell automated traffic apart from real human visitors. It combines signals like IP reputation, fingerprints, and behavior to block scrapers and abuse.
Definition
Bot detection refers to the systems and signals websites use to identify and filter out automated traffic such as scrapers, credential stuffers, and ad-fraud bots, while letting genuine users through. Modern detection blends dozens of signals into a real-time risk score.
Common Detection Signals
- Network: IP reputation, datacenter vs residential origin, and request rate.
- Fingerprinting: TLS/JA3 signatures, browser fingerprints, and canvas readings.
- Behavioral: Mouse movement, scroll patterns, timing, and navigation flow.
- Challenges: CAPTCHAs and JavaScript tests when risk is elevated.
How It Works
A detection engine aggregates these signals and assigns a confidence score. Low-risk visitors pass silently, while suspicious ones are challenged, rate-limited, fed decoy data, or blocked outright. Vendors like Cloudflare, DataDome, and Akamai continuously update their models.
Why It Matters for Scraping
Effective scraping depends on defeating bot detection without tripping these signals. That means using high-quality residential proxies, realistic browser fingerprints, human-like pacing, and proper headers. A single mismatched signal can flag an otherwise clean session.
Examples
DataDome blocking a scraper after detecting a datacenter IP and a non-human request cadence
A site serving fake prices to a flagged bot instead of blocking it outright
Akamai correlating TLS fingerprint and mouse behavior to score traffic
Common Use Cases
Frequently Asked Questions
Keep Learning
All termsResidential Proxy
A residential proxy routes your traffic through a real device with an IP assigned by an Internet Service Provider, so requests appear to come from a genuine home user rather than a server.
Read definitionCAPTCHA
A CAPTCHA is a challenge–response test used to tell humans and bots apart, such as identifying images or checking a box, to block automated access.
Read definitionBrowser Fingerprinting
Browser fingerprinting identifies and tracks a device by combining dozens of browser and system attributes — like fonts, canvas rendering and user agent — into a near-unique signature.
Read definitionRate Limiting
Rate limiting restricts how many requests a client can make in a given time, and it is one of the most common defenses scrapers must work around.
Read definition