API Error Decoder
Decode cryptic API error codes into plain explanations — 4xx client errors, 5xx server faults, and retry guidance. Runs locally in your browser.
How to Use the API Error Decoder
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Frequently Asked Questions
Which codes are covered?
4xx client errors, 5xx server faults, and common API-specific codes.
Which errors are retryable?
429 and 503 usually yes; 4xx usually means fix the request, not the timing.
Does it explain my vendor's codes?
Standard codes fully; vendor-specific ones map to their documented meanings.
Is my work uploaded anywhere when using API Error Decoder?
No — decoding runs locally in your browser, free with no signup.
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Last updated October 2026