Vibecoding: Instantly Fix 401 Errors. An Automated Debug Loop That Runs 30+ Checks and Finds Root Cause

Instantly Fix 401 Errors. An Automated Debug Loop That Runs 30+ Checks and Finds Root Cause If you’ve been banging your head against stubborn 401s, this looped prompt will save you hours of guesswork. This is the exact prompt I used when I got stuck with Google OAuth errors. This prompt is an automated 401-investigation loop that avoids past fixes, iteratively tests a broad checklist of auth failures (JWT validity/claims, headers, audience, CSRF, middleware, env mismatches, rate limits, etc.), and logs each attempt with suspected cause. It decodes and inspects the token, performs a real /api/verify-subscriber call, then repeats until at least 30 checks have been exercised, three fixes are verified, and a clear root cause report is produced with structured notes for debugging and regression prevention. The prompt is in JSON format — which means the content is structured as key–value pairs that machines and coding agents can read directly (no extra cleanup needed). You don’t need to rewrite or reformat anything: simply copy and paste this block as-is into your AI coding agent, and it will understand the schema, properties, and instructions automatically. 👉 Grab the prompt

Step-by-step instructions...