feat(clerk-js): Add debug logging for Turnstile captcha errors

[jacekradko]

Summary

Adds comprehensive debug logging when Turnstile captcha challenges fail, capturing timing, error sequences, and container state to help diagnose issues like 200100 "Widget not found" race conditions.

What's Logged (on failure only)

debugLogger.error('Turnstile captcha challenge failed', {
  captchaAttemptId,        // UUID (crypto.randomUUID) or fallback random ID
  errorTimeline,           // Array of { code, t } with relative ms timestamps
  lastErrorCode,           // Final error code for easy grep/filtering
  finalError,              // The error string being thrown
  retriesAttempted,        // Number of retries (0-2)
  widgetType,              // 'smart' | 'invisible' | 'modal'
  containerExistsAtFailure,// Whether DOM container existed at failure time
  totalDurationMs,         // Total time from start to failure
}, 'captcha');

Example Output

{
  captchaAttemptId: '550e8400-e29b-41d4-a716-446655440000',
  errorTimeline: [
    { code: '300xxx', t: 1250 },  // First error at 1.25s
    { code: '200100', t: 1520 },  // Second error at 1.52s (after retry)
  ],
  lastErrorCode: '200100',
  finalError: '300xxx,200100',
  retriesAttempted: 1,
  widgetType: 'smart',
  containerExistsAtFailure: false,  // Container was gone when error occurred
  totalDurationMs: 1523,
}

Why

When investigating captcha failures like 200100, we need to know:

1. Error sequence - Is 200100 the root cause or a symptom of a previous failure during retry?
2. Timing - Did errors happen instantly (DOM miss) or after network delays?
3. Container state - Was the DOM container present when the error occurred? (Key for race condition diagnosis)

[changeset-bot]

🦋 Changeset detected

Latest commit: f454c4c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@clerk/clerk-js	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-expo	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Feb 4, 2026 10:05pm

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

• 🔍 Trigger a full review

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat-captcha-error-logging

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[pkg-pr-new]

Open in StackBlitz

@clerk/agent-toolkit

npm i https://pkg.pr.new/@clerk/agent-toolkit@7768

@clerk/astro

npm i https://pkg.pr.new/@clerk/astro@7768

@clerk/backend

npm i https://pkg.pr.new/@clerk/backend@7768

@clerk/chrome-extension

npm i https://pkg.pr.new/@clerk/chrome-extension@7768

@clerk/clerk-js

npm i https://pkg.pr.new/@clerk/clerk-js@7768

@clerk/dev-cli

npm i https://pkg.pr.new/@clerk/dev-cli@7768

@clerk/elements

npm i https://pkg.pr.new/@clerk/elements@7768

@clerk/clerk-expo

npm i https://pkg.pr.new/@clerk/clerk-expo@7768

@clerk/expo-passkeys

npm i https://pkg.pr.new/@clerk/expo-passkeys@7768

@clerk/express

npm i https://pkg.pr.new/@clerk/express@7768

@clerk/fastify

npm i https://pkg.pr.new/@clerk/fastify@7768

@clerk/localizations

npm i https://pkg.pr.new/@clerk/localizations@7768

@clerk/nextjs

npm i https://pkg.pr.new/@clerk/nextjs@7768

@clerk/nuxt

npm i https://pkg.pr.new/@clerk/nuxt@7768

@clerk/clerk-react

npm i https://pkg.pr.new/@clerk/clerk-react@7768

@clerk/react-router

npm i https://pkg.pr.new/@clerk/react-router@7768

@clerk/remix

npm i https://pkg.pr.new/@clerk/remix@7768

@clerk/shared

npm i https://pkg.pr.new/@clerk/shared@7768

@clerk/tanstack-react-start

npm i https://pkg.pr.new/@clerk/tanstack-react-start@7768

@clerk/testing

npm i https://pkg.pr.new/@clerk/testing@7768

@clerk/themes

npm i https://pkg.pr.new/@clerk/themes@7768

@clerk/types

npm i https://pkg.pr.new/@clerk/types@7768

@clerk/upgrade

npm i https://pkg.pr.new/@clerk/upgrade@7768

@clerk/vue

npm i https://pkg.pr.new/@clerk/vue@7768

commit: f454c4c