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Playwright Stealth Verify

Measures whether your Playwright, Puppeteer, Selenium or CDP browser presents a self-consistent fingerprint, scoring an existing Page object in place.

Dev & CodingIntermediate★ 237⑂ 0AI score 9/10Last updated: Aug 6, 2026

What it does

  • Uses liarjs as a library: checkPage(page) accepts any object exposing evaluate(), so Playwright and Puppeteer Page objects work and the harness under test is measured with its real launch flags, plugins and proxy.
  • Catches harness-specific tells with named check ids: webdriver left set by the driver, a HeadlessChrome token in the UA, worker-consistency where an override only patched the main thread, native-integrity where a patched API no longer reports [native code], gpu-triad where WebGL and WebGPU name different GPUs, plus chrome-object, headless-viewport and codecs.
  • Returns { score, label, checks[], client, server, meta }, so you can assert a minimum score or require zero bad checks in a test suite.
  • Can attach to a browser already running outside the test process via npx liarjs@0.3 --cdp http://127.0.0.1:9222.
  • Measurement only: it does not modify the browser and ships no evasions or profiles.

Who it's for

  • QA and automation engineers running E2E or scraping harnesses on Playwright, Puppeteer or Selenium.
  • Anyone who wants to measure a stealth plugin's actual effect instead of assuming it.
  • Teams turning fingerprint quality into a regression gate in CI.

Examples

  1. Assert in a test: call checkPage(page) and require result.checks.filter(c => c.status === 'bad') to be empty, failing the suite on a stealth regression.
  2. Audit a patched Chromium: launch it with --remote-debugging-port=9222, then run npx liarjs@0.3 --cdp http://127.0.0.1:9222 against that exact process.
  3. Air-gapped run: use --offline to execute only the 32 JavaScript-layer checks with no outbound request, or point --endpoint at your own deployment of the edge Worker.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/liarjsdev/liarjs-skills/HEAD/skills/playwright-stealth-verify/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/playwright-stealth-verify folder from the GitHub repo liarjsdev/liarjs-skills into my ~/.claude/skills/playwright-stealth-verify/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/liarjsdev/liarjs-skills.git /tmp/liarjs-skills && mkdir -p ~/.claude/skills && cp -r /tmp/liarjs-skills/skills/playwright-stealth-verify ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Confirm Node.js 22 or newer is installed (node -v).
  2. Clone the skills repository: git clone https://github.com/liarjsdev/liarjs-skills.git
  3. Copy the skill into your Claude skills folder: mkdir -p ~/.claude/skills && cp -r liarjs-skills/skills/playwright-stealth-verify ~/.claude/skills/
  4. Restart Claude Code and ask something like "check whether my headless browser looks coherent" to confirm the skill loads.
  5. For library use, inside your test project run npm install --save-dev liarjs so the version is pinned in the lockfile.
  6. To try the CLI with no install, run npx liarjs@0.3 first — it launches a throwaway temp profile and cleans it up.
  7. If outbound traffic is restricted, add --offline, or self-host the edge Worker and pass --endpoint.
View source on GitHub ↗License: MIT