FREE TOOL · ERROR CHECKER
Free error checker for AI-built apps
Paste an error. Get what it means, the most likely cause, and what to check first, for the errors Lovable, Bolt, Replit, Cursor and v0 apps hit most.
Ctrl/⌘ + Enter
Runs entirely in your browser. Nothing you paste is sent to us or stored. If it looks like you pasted a secret key, we'll warn you.
01 · IN YOUR BROWSER
Your error never leaves this page. No account, no upload.
02 · 72 KNOWN ERRORS
Supabase, Stripe, auth, deploys, env vars, builds, Next.js, Vite, DNS, SSL and email, from Lovable, Bolt, Replit, Cursor and v0 apps.
03 · NEXT STEP
Each answer links to the full guide, or to a fixed-scope fix if you'd rather hand it off.
Matching is pattern-based and can be wrong. It explains likely causes; it doesn't look at your code.
Questions
Is the error checker free?
Yes. It is free, needs no account, and runs in your browser.
Do you see the error I paste?
No. Matching happens in your browser and nothing you paste is sent to us or stored. If your paste looks like it contains a secret key, the checker warns you to rotate it.
Which errors does it know?
72 common errors across Supabase (RLS, auth, JWT, pooler), Stripe (webhooks, signatures, keys), Vercel, Netlify and Replit deploys, env vars, CORS, builds, TypeScript, npm, Next.js, Vite, 404 on refresh, DNS, SSL and email, from apps built with Lovable, Bolt, Replit, Cursor and v0.
What if it does not recognise my error?
Paste the first red line from the console or the first error in the build log. If it still has no match, a $149 diagnosis finds the cause and gives you a fixed quote, credited in full toward any paid job.
Also free: the Supabase exposure scan. Browse the error library for full guides.