GeeTest CAPTCHA v4
and CapMonster Cloud

// npm install playwright @zennolab_com/capmonstercloud-client

import { chromium } from "playwright";
import {
  CapMonsterCloudClientFactory,
  ClientOptions,
  GeeTestRequest
} from "@zennolab_com/capmonstercloud-client";

const CAPMONSTER_API_KEY = "YOUR_CAPMONSTER_API_KEY";

async function solveGeetestV4(pageUrl) {
  const browser = await chromium.launch({ headless: false });
  const context = await browser.newContext({ viewport: null });
  const page = await context.newPage();

  let detected = null;
  let solutionObj = null;

  // 1. Intercept the /load response (detect captcha_id, challenge, etc.)
  page.on("response", async (response) => {
    const url = response.url();
    if (!url.startsWith("https://gcaptcha4.geetest.com/load?")) return;

    const params = new URLSearchParams(url.split("?")[1] || "");
    const captchaId = params.get("captcha_id");
    const challenge = params.get("challenge");
    const captchaType = params.get("captcha_type");

    if (captchaId && challenge) {
      detected = { captchaId, challenge, captchaType };
      console.log("Detected GeeTest v4 load:", detected);
    }
  });

  // 2. Load the page
  console.log("Opening page:", pageUrl);
  await page.goto(pageUrl, { waitUntil: "domcontentloaded" });

  // 3. Wait until /load is captured
  console.log("Waiting for GeeTest /load...");
  while (!detected) {
    await page.waitForTimeout(500);
  }

  // 4. Send the task to CapMonster Cloud
  console.log("Sending task to CapMonster...");
  const cmc = CapMonsterCloudClientFactory.Create(
    new ClientOptions({ clientKey: CAPMONSTER_API_KEY })
  );

  const task = new GeeTestRequest({
    websiteURL: pageUrl,
    gt: detected.captchaId,
    challenge: detected.challenge,
    version: "4",
    initParameters: {
      riskType: detected.captchaType || "slide"
    }
  });

  const solveRes = await cmc.Solve(task);
  const sol = solveRes.solution || solveRes;

  solutionObj = {
    captcha_id: sol.captcha_id || detected.captchaId,
    captcha_output: sol.captcha_output,
    lot_number: sol.lot_number,
    pass_token: sol.pass_token
  };

  console.log("Got solution from CapMonster:", solutionObj);

  // 5. Substitute your values into /verify to get a successful response
  await page.route("https://gcaptcha4.geetest.com/verify*", async (route) => {
    console.log("Intercepted /verify, injecting fake success...");
    const body = `geetest_${Date.now()}(${JSON.stringify({
      status: "success",
      data: {
        result: "success",
        seccode: {
          captcha_id: solutionObj.captcha_id,
          captcha_output: solutionObj.captcha_output,
          lot_number: solutionObj.lot_number,
          pass_token: solutionObj.pass_token
        }
      }
    })})`;

    await route.fulfill({
      status: 200,
      contentType: "application/javascript",
      body
    });
  });

  // 6. Imitate a user action (for example, click the captcha button)
  console.log("Waiting for captcha interaction...");
  await page.waitForTimeout(3000);

  // Example of a verification call:
  try {
    await page.click('.geetest_btn'); // captcha button
    console.log("Clicked captcha button");
  } catch {
    console.log("Captcha button not found");
  }

  // Sometimes you need to call verify() manually:
  await page.evaluate(() => {
    if (window.initGeetest4 && typeof verify === "function") {
      verify();
    }
  });

  console.log("Waiting for verification request...");
  await page.waitForTimeout(3000);

  await browser.close();

  return { detected, solution: solutionObj };
}
(async () => {
  const url = "https://example.com"; // replace with a page that has GeeTest v4
  const res = await solveGeetestV4(url);
  console.log("FINISHED:", res);
})();