Console Errors Test
The Console Errors Test loads any URL in headless Chrome and captures everything that appears in the browser console during page load — errors, warnings, network failures, CSP violations, deprecated API usage and third-…
- Results in seconds
- Pass / fail + fix guidance
- No account required
The Console Errors Test loads any URL in headless Chrome and captures everything that appears in the browser console during page load — errors, warnings, network failures, CSP violations, deprecated API usage and third-party noise. Console output is the canary in the coal mine for site health: persistent warnings often hide real bugs that surface as user-impacting issues weeks later.
What This Tool Checks
- console.error messages
- console.warn messages
- Network failures (failed fetch, blocked CORS, 404 assets)
- CSP violation reports
- Deprecated browser API warnings
- Mixed-content warnings on HTTPS pages
- Third-party script noise
Why It Matters for SEO
Most production sites have dozens of console errors and warnings nobody reads — but persistent noise hides the new errors that matter. Cleaning up console output is a basic hygiene step that lets you spot regressions instantly. Many warnings (deprecated APIs, CSP violations) also predict future breakage when browsers ship the next change.
How to Fix It
Triage every error and warning in this report. Fix first-party issues; report third-party issues to the vendor or remove the script. Strip console.log calls from production builds. Resolve deprecated API warnings before browsers remove the API. Migrate any HTTP asset references to HTTPS.
How It Works
Headless Chrome subscribes to console events during navigation and the first few seconds of page life, then collects every message classified by severity. Each message is reported with source URL, line number and a short categorisation so you can fix the highest-impact issues first.
Common Mistakes to Avoid
- Treating console output as developer-only noise nobody needs to clean up
- Leaving development console.log calls in production
- Ignoring deprecated API warnings until the API is removed
- CSP violations dismissed instead of fixed
- Mixed-content warnings on HTTPS pages (loading HTTP resources)
Quick Checklist
- Zero console.error messages in production
- No console.log left from development
- No deprecated API warnings
- No CSP violations
- No mixed-content warnings on HTTPS pages
Put your whole site on autopilot — SEO and AI search
PositionMySite monitors every signal on this page across your entire website 24/7 — plus keyword rankings, competitor moves and AI-search readiness (llms.txt, schema, ChatGPT & Gemini visibility). When something breaks, you know before Google does.
Every feature unlocked · No commitment · Cancel anytimeFrequently Asked Questions
Yes. Persistent warnings hide new errors and often predict breakage when browsers remove deprecated APIs. Treat console output as a quality signal worth keeping clean.
Build tools (esbuild, terser, swc) can drop console calls automatically with a flag. Only strip console.log; keep console.error so real production errors still surface to monitoring.
A Content Security Policy violation occurs when a page tries to load a resource or execute code that violates the policy declared by the CSP header. Fix the policy or fix the offending code.
Report them to the vendor, vote on the issue tracker, or remove the third-party if it adds more noise than value. Keep your own code clean even if you cannot control vendors.
Indirectly. Console errors often correlate with broken interactions and poor UX, which feed user-engagement signals Google increasingly weights. Cleaning the console rarely hurts and often helps.