Cloudflare Turnstile Implementation Detection Guide

Before you can solve a Cloudflare Turnstile challenge, you need to detect it on the page and extract the sitekey. Turnstile can be embedded via HTML attributes, JavaScript API calls, or loaded dynamically after page render. This guide covers every detection method — from simple HTML parsing to runtime JavaScript analysis.

Turnstile implementation methods

Sites embed Turnstile in three ways, each requiring a different detection approach:

Method 1: Static HTML detection

The simplest Turnstile integration uses the cf-turnstile class and data-sitekey attribute:

import re
import requests

def detect_turnstile_html(url):
    """Detect Turnstile from static HTML."""
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
                      "AppleWebKit/537.36 Chrome/120.0.0.0",
        "Accept": "text/html,*/*;q=0.8",
        "Accept-Language": "en-US,en;q=0.9",
    }

    response = requests.get(url, headers=headers, timeout=15)
    html = response.text

    result = {
        "turnstile_found": False,
        "sitekey": None,
        "mode": None,
        "theme": None,
        "action": None,
        "script_loaded": False,
    }

    # Check for Turnstile script
    if "challenges.cloudflare.com/turnstile" in html:
        result["script_loaded"] = True

    # Check for widget container
    if "cf-turnstile" in html:
        result["turnstile_found"] = True

        # Extract sitekey
        sitekey_match = re.search(
            r'data-sitekey=["\']([0-9x][A-Za-z0-9_-]+)["\']', html
        )
        if sitekey_match:
            result["sitekey"] = sitekey_match.group(1)

        # Extract mode
        if 'data-size="invisible"' in html:
            result["mode"] = "invisible"
        elif 'data-appearance="interaction-only"' in html:
            result["mode"] = "non-interactive"
        else:
            result["mode"] = "managed"

        # Extract theme
        theme_match = re.search(r'data-theme=["\'](\w+)["\']', html)
        if theme_match:
            result["theme"] = theme_match.group(1)

        # Extract action
        action_match = re.search(r'data-action=["\']([^"\']+)["\']', html)
        if action_match:
            result["action"] = action_match.group(1)

    return result


# Usage
info = detect_turnstile_html("https://example.com/login")
if info["turnstile_found"]:
    print(f"Sitekey: {info['sitekey']}")
    print(f"Mode: {info['mode']}")

Method 2: JavaScript API detection

Some sites use turnstile.render() instead of HTML attributes:

import re

def detect_turnstile_js_api(html):
    """Detect Turnstile from JavaScript render calls."""
    patterns = [
        # turnstile.render('#element', {sitekey: '...'})
        r"turnstile\.render\s*\(\s*['\"]([^'\"]+)['\"]\s*,\s*\{([^}]+)\}",
        # turnstile.render(element, {sitekey: '...'})
        r"turnstile\.render\s*\([^,]+,\s*\{([^}]+)\}",
    ]

    for pattern in patterns:
        match = re.search(pattern, html, re.DOTALL)
        if match:
            config_text = match.group(match.lastindex)

            # Extract sitekey from config object
            sitekey_match = re.search(
                r"sitekey\s*:\s*['\"]([0-9x][A-Za-z0-9_-]+)['\"]", config_text
            )
            # Extract callback
            callback_match = re.search(
                r"callback\s*:\s*(\w+|function)", config_text
            )
            # Extract action
            action_match = re.search(
                r"action\s*:\s*['\"]([^'\"]+)['\"]", config_text
            )
            # Extract appearance
            appearance_match = re.search(
                r"appearance\s*:\s*['\"]([^'\"]+)['\"]", config_text
            )

            return {
                "found": True,
                "method": "javascript_api",
                "sitekey": sitekey_match.group(1) if sitekey_match else None,
                "callback": callback_match.group(1) if callback_match else None,
                "action": action_match.group(1) if action_match else None,
                "appearance": appearance_match.group(1) if appearance_match else None,
            }

    return {"found": False, "method": None}

Method 3: Dynamic loading detection (Selenium/Puppeteer)

When Turnstile loads dynamically after page interaction:

Python (Selenium)

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import re

def detect_turnstile_dynamic(url):
    """Detect dynamically loaded Turnstile using Selenium."""
    options = webdriver.ChromeOptions()
    options.add_argument("--disable-blink-features=AutomationControlled")
    driver = webdriver.Chrome(options=options)

    try:
        driver.get(url)

        # Wait for page to fully load
        WebDriverWait(driver, 10).until(
            lambda d: d.execute_script("return document.readyState") == "complete"
        )

        result = {
            "turnstile_found": False,
            "sitekey": None,
            "iframe_present": False,
            "response_field": False,
        }

        # Check for Turnstile iframe
        iframes = driver.find_elements(By.CSS_SELECTOR, "iframe[src*='challenges.cloudflare.com']")
        if iframes:
            result["turnstile_found"] = True
            result["iframe_present"] = True

        # Check for cf-turnstile container
        containers = driver.find_elements(By.CSS_SELECTOR, ".cf-turnstile, [data-sitekey]")
        for container in containers:
            sitekey = container.get_attribute("data-sitekey")
            if sitekey:
                result["turnstile_found"] = True
                result["sitekey"] = sitekey

        # Check for hidden response field
        response_fields = driver.find_elements(
            By.CSS_SELECTOR, "[name='cf-turnstile-response'], [name='g-recaptcha-response']"
        )
        if response_fields:
            result["response_field"] = True

        # Check page source for JS API render
        page_source = driver.page_source
        js_match = re.search(
            r"sitekey\s*:\s*['\"]([0-9x][A-Za-z0-9_-]+)['\"]", page_source
        )
        if js_match and not result["sitekey"]:
            result["sitekey"] = js_match.group(1)
            result["turnstile_found"] = True

        return result

    finally:
        driver.quit()

Node.js (Puppeteer)

const puppeteer = require("puppeteer");

async function detectTurnstileDynamic(url) {
  const browser = await puppeteer.launch({
    headless: "new",
    args: ["--disable-blink-features=AutomationControlled"],
  });

  const page = await browser.newPage();

  const result = {
    turnstileFound: false,
    sitekey: null,
    iframePresent: false,
    responseField: false,
    scriptUrl: null,
  };

  // Monitor network for Turnstile script
  page.on("response", (response) => {
    if (response.url().includes("challenges.cloudflare.com/turnstile")) {
      result.scriptUrl = response.url();
    }
  });

  await page.goto(url, { waitUntil: "networkidle2" });

  // Check for Turnstile container
  const sitekey = await page.evaluate(() => {
    const el = document.querySelector(
      ".cf-turnstile, [data-sitekey]"
    );
    return el ? el.getAttribute("data-sitekey") : null;
  });

  if (sitekey) {
    result.turnstileFound = true;
    result.sitekey = sitekey;
  }

  // Check for Turnstile iframe
  const iframes = await page.$$("iframe[src*='challenges.cloudflare.com']");
  if (iframes.length > 0) {
    result.turnstileFound = true;
    result.iframePresent = true;
  }

  // Check for response field
  const responseField = await page.$(
    "[name='cf-turnstile-response']"
  );
  result.responseField = !!responseField;

  await browser.close();
  return result;
}

detectTurnstileDynamic("https://example.com/login").then(console.log);

Comprehensive detection class

import re
import requests

class TurnstileDetector:
    """Detect Cloudflare Turnstile across all implementation methods."""

    TURNSTILE_SCRIPT = "challenges.cloudflare.com/turnstile"
    SITEKEY_PATTERNS = [
        r'data-sitekey=["\']([0-9x][A-Za-z0-9_-]+)["\']',
        r"sitekey\s*:\s*['\"]([0-9x][A-Za-z0-9_-]+)['\"]",
        r"siteKey\s*[=:]\s*['\"]([0-9x][A-Za-z0-9_-]+)['\"]",
        r"TURNSTILE_SITE_KEY\s*[=:]\s*['\"]([0-9x][A-Za-z0-9_-]+)['\"]",
    ]

    def __init__(self, url, html=None):
        self.url = url
        self.html = html
        if not self.html:
            self._fetch()

    def _fetch(self):
        headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
                          "AppleWebKit/537.36 Chrome/120.0.0.0",
            "Accept": "text/html,*/*;q=0.8",
            "Accept-Language": "en-US,en;q=0.9",
        }
        response = requests.get(self.url, headers=headers, timeout=15)
        self.html = response.text

    def detect(self):
        """Run all detection methods and return results."""
        return {
            "url": self.url,
            "turnstile_present": self.has_turnstile(),
            "sitekey": self.extract_sitekey(),
            "mode": self.detect_mode(),
            "implementation": self.detect_implementation(),
            "script_loaded": self.has_script(),
            "response_field": self.has_response_field(),
            "action": self.extract_action(),
            "theme": self.extract_theme(),
        }

    def has_turnstile(self):
        return (
            self.has_script()
            or "cf-turnstile" in self.html
            or self.extract_sitekey() is not None
        )

    def has_script(self):
        return self.TURNSTILE_SCRIPT in self.html

    def has_response_field(self):
        return "cf-turnstile-response" in self.html

    def extract_sitekey(self):
        for pattern in self.SITEKEY_PATTERNS:
            match = re.search(pattern, self.html)
            if match:
                return match.group(1)
        return None

    def detect_mode(self):
        if 'data-size="invisible"' in self.html or "size: 'invisible'" in self.html:
            return "invisible"
        if 'data-appearance="interaction-only"' in self.html:
            return "non-interactive"
        if "cf-turnstile" in self.html:
            return "managed"
        return "unknown"

    def detect_implementation(self):
        if "cf-turnstile" in self.html and re.search(r"data-sitekey=", self.html):
            return "html_implicit"
        if "turnstile.render" in self.html:
            return "javascript_explicit"
        if self.has_script() and not "cf-turnstile" in self.html:
            return "dynamic_loading"
        return "unknown"

    def extract_action(self):
        match = re.search(r'data-action=["\']([^"\']+)["\']', self.html)
        if match:
            return match.group(1)
        match = re.search(r"action\s*:\s*['\"]([^'\"]+)['\"]", self.html)
        return match.group(1) if match else None

    def extract_theme(self):
        match = re.search(r'data-theme=["\'](\w+)["\']', self.html)
        return match.group(1) if match else "auto"


# Usage
detector = TurnstileDetector("https://example.com/login")
info = detector.detect()

if info["turnstile_present"]:
    print(f"Sitekey: {info['sitekey']}")
    print(f"Mode: {info['mode']}")
    print(f"Implementation: {info['implementation']}")

Solving after detection

Once detected, solve with CaptchaAI:

import requests
import time

API_KEY = "YOUR_API_KEY"

def solve_detected_turnstile(detection_result):
    """Solve Turnstile using detection results."""
    if not detection_result["turnstile_present"]:
        raise ValueError("No Turnstile detected")

    if not detection_result["sitekey"]:
        raise ValueError("Sitekey not found — may need browser-based extraction")

    params = {
        "key": API_KEY,
        "method": "turnstile",
        "sitekey": detection_result["sitekey"],
        "pageurl": detection_result["url"],
        "json": 1,
    }

    # Include action if present
    if detection_result.get("action"):
        params["action"] = detection_result["action"]

    submit = requests.post("https://ocr.captchaai.com/in.php", data=params)
    task_id = submit.json()["request"]

    for _ in range(60):
        time.sleep(5)
        result = requests.get("https://ocr.captchaai.com/res.php", params={
            "key": API_KEY,
            "action": "get",
            "id": task_id,
            "json": 1,
        }).json()

        if result.get("status") == 1:
            return result["request"]

    raise TimeoutError("Turnstile solve timed out")


# Full workflow
detector = TurnstileDetector("https://example.com/signup")
info = detector.detect()

if info["turnstile_present"]:
    token = solve_detected_turnstile(info)
    print(f"Token: {token[:50]}...")

Edge cases

Troubleshooting

Frequently asked questions

Can Turnstile sitekeys change?

Yes. Site operators can rotate sitekeys at any time. Always extract the sitekey fresh from the page rather than hardcoding it.

Do I need the action parameter?

Only if the site validates it server-side. If data-action is present in the HTML, include it in your solve request for best results.

What if I can't find the sitekey?

The sitekey might be in an external JavaScript file, an API response, or generated dynamically. Use browser DevTools (Network tab) to find it, or use Selenium/Puppeteer to extract it after full page rendering.

Does detection method affect solving?

No. CaptchaAI's Turnstile solver works the same regardless of how the widget was implemented. You just need the sitekey and page URL.

Summary

Detecting Cloudflare Turnstile requires checking for the Turnstile script tag, cf-turnstile container, data-sitekey attributes, and turnstile.render() calls. Use static HTML parsing for simple integrations and Selenium/Puppeteer for dynamically loaded widgets. Once detected, solve with CaptchaAI's Turnstile solver using the extracted sitekey — all modes are handled identically with 100% success rate.

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