Anti-bot detection
Anti-bot detection is the set of techniques a website uses to tell automated traffic from human visitors, such as CAPTCHAs, fingerprinting, and rate checks, in order to block or challenge scrapers and bots.
Anti-bot detection covers the methods a site uses to decide whether a visitor is a real person or an automated client. Common signals include CAPTCHAs, browser fingerprinting, JavaScript challenges, IP reputation checks, and unusual request patterns. When a request looks automated, the site may block it, serve a challenge page, or return content that is missing the real data.
Sites with heavy anti-bot protection (large marketplaces and storefronts, for example) are deliberately hard to read with automation. This is a legitimate choice on their part, and respecting it is part of responsible scraping along with honoring robots.txt and terms of service.
Extracto is built to handle this. It runs every request through a real headless browser and includes a managed anti-bot bypass layer that handles protected sites, including those behind Cloudflare, DataDome, and PerimeterX. Proxies and anti-bot handling are managed for you, with no setup. It works on any public HTTPS URL, including JavaScript-rendered and anti-bot-protected pages. The one thing it does not do in the self-serve product is reach login-gated content (LinkedIn, X, Instagram), which needs session cookies and is available on Enterprise. Fields that are genuinely absent from a page still come back as null rather than a fabricated value.
Examples
A CAPTCHA wall
A site that shows a CAPTCHA or challenge page before revealing its content will block a plain browser. Extracto's managed bypass layer is designed to clear these challenges so the real page renders and your fields are filled from it.
Fingerprint-based blocking
Some sites profile browser characteristics and reject anything that looks automated. Extracto's bypass layer presents a realistic browser fingerprint and rotates managed proxies so these pages render normally, and a field is only ever null when it is genuinely absent from the page.
See also
Anti-bot detection: FAQ
Does Extracto bypass anti-bot detection or solve CAPTCHAs?
Which kinds of pages work reliably despite anti-bot trends?
Want to put this into practice? Extracto extracts structured data from a URL using a JSON schema, with the result validated before it leaves the API. Try the live demo or read the docs.