Errors appear automatically
Console errors, network failures, and unhandled exceptions stream into the sidebar in real-time. No copy-pasting, no DevTools hunting.
Chrome Extension — Free to Start
Stop Googling
Stop Googling
Error Messages
AI-powered sidebar that catches errors in real-time, explains what went wrong, and shows you the fix. Right on the page.
ErrorDecoder
React · Next.js · localhost:3000
CORS Error
just now
Access to fetch at 'https://api.example.com/users' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present.
AI Decode
What Happened
Your frontend at localhost:3000 is trying to call an API on a different origin. The server at api.example.com isn't sending CORS headers, so the browser blocks the response.
How to Fix
Add CORS headers on your API server:
Access-Control-Allow-Origin: http://localhost:3000
Or if you're using Express:
app.use(cors({ origin: 'http://localhost:3000' }))
Works with every stack
How it works
Debug in seconds,
Debug in seconds,
not hours
No setup, no configuration. Open the sidebar and ErrorDecoder handles the rest.
Click Decode
Select one error or batch them all. AI analyzes the error with your tech stack context — framework, environment, and page URL all factor in.
Get the fix
Plain English explanation, root cause analysis, step-by-step solution, and copy-pasteable code. No more Stack Overflow rabbit holes.
Features
Everything you need
Everything you need
to debug faster
Real-time error stream
Console errors, network failures, and unhandled exceptions captured automatically as they happen. No setup needed.
AI-powered decode
Claude AI explains what happened, why it happened, and exactly how to fix it. With copy-pasteable code examples tailored to your stack.
Element inspector
Click any element on the page. See computed styles, CSS rules, and ask AI questions about it. Like DevTools, but with a brain.
90+ tech detection
Auto-detects your framework — React, Vue, Django, Express, and 90+ more. AI tailors its advice to your exact stack, not generic answers.
Source map resolution
Maps minified stack traces back to your original source files. See the actual line that broke, not bundle.min.js:1.
Sensitive data protection
Automatically scans for API keys, passwords, tokens, SSNs, credit cards, and PII before sending. Warns you so secrets never leave your browser by accident.
Works everywhere
Any webpage. Stack Overflow, GitHub, your localhost, production. Wherever errors happen — ErrorDecoder is already watching.
Coverage
Decode any error
From cryptic stack traces to mysterious network failures — ErrorDecoder handles them all.
TypeError
ReferenceError
CORS
404 / 500
React Hydration
Module Not Found
Promise Rejection
Auth Failures
Build Errors
Database Errors
Network Timeouts
SyntaxError
Webpack Errors
API Errors
Pricing
Simple, transparent pricing
Start free. Upgrade when you need more.
Free
$0
/ month
$0
/ year
Forever free, no credit card.
- 3 decodes per day
- Claude Haiku AI
- Basic page context
- 1,000 character limit
- Decode history
- Deep Analysis (Sonnet)
Pro
$9
/ month
$79
/ year
Billed yearly = $6.58/month.
- Unlimited decodes
- Claude Haiku + Sonnet AI
- Full page context
- Unlimited input size
- Full decode history
- 20 Deep Analysis / month
FAQ
Frequently asked questions
Is it really free?
Yes! The free plan includes 3 AI-powered error decodes per day, forever. No credit card required. No trial period.
What data do you collect?
Only the error text you explicitly choose to decode. We never access your source code, browsing history, or any page content you don't select. Error text is processed by Claude AI (Anthropic) and optionally cached to speed up common errors.
Does it work offline?
The error capture and element inspector work without internet. AI-powered decoding requires an internet connection to reach the Claude API.
Which browsers are supported?
Chrome and all Chromium-based browsers — Edge, Brave, Opera, Arc, and Vivaldi.
Can it see my source code?
No. ErrorDecoder only sees the error message and stack trace text. If source maps are available (dev mode), it maps minified filenames back to originals, but your actual source code stays in your browser.
What AI model powers it?
Claude by Anthropic. Free users get Claude Haiku 4.5 (fast, accurate). Pro users also get access to Claude Sonnet 4.6 for deeper analysis of complex errors — 20 Sonnet decodes per month.
Ready to stop wasting time
on error messages?
Join thousands of developers who decode errors in seconds, not hours.
⚡ Add to Chrome — FreeNo credit card required. Free forever.