API Error Decoder: A Tool for Making Sense of HTTP Errors
If you've ever stared at a 422 Unprocessable Entity with a vague JSON response or tried to debug a 500 from a third-party API with zero context, you know how much time gets lost just understanding what went wrong — let alone fixing it.
I built API Error Decoder to help with that.
It’s a simple web tool that takes raw HTTP error responses (like those from fetch, axios, or browser dev tools) and breaks them down into something more human-readable. You paste in the status code, headers, and response body, and it highlights potential issues — like malformed JSON, missing required fields, rate limiting, or unclear error messages — then suggests next steps based on common API patterns.
It doesn’t replace logging or monitoring, but it helps when you're stuck and need a second pair of eyes.
The tool supports common error formats (RFC 7807, Stripe, AWS, GitHub, etc.) and gives context on what the error might mean, especially when the API docs aren’t handy.
It’s free to use for basic decoding — unlimited attempts, no login required.
There’s also a Pro tier ($9/month) that adds:
- History of past errors
- Syntax-aware parsing (e.g., detects if a value should’ve been a number)
- Exportable debug reports
- Dark mode (because, well, eyes)
I’ve been using it daily while integrating with a few poorly documented APIs, and it’s cut down the “what is this even telling me?” time by a lot.
No AI, no magic — just structured parsing and a few hard-earned lessons from debugging other people’s error messages.
Check it out if this sounds familiar:
https://tool-api-error-decoder-3nsvwqm2w-orbitboyzz-4697s-projects.vercel.app
Feedback welcome. Open to suggestions, especially if you’ve battled some truly cryptic API errors.
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