Free Online API Error Decoder
Paste API responses, server logs, headers, or JSON error payloads to turn vague failures into a practical diagnosis. The tool identifies common authentication, CORS, validation, rate-limit, webhook, and timeout clues.
API Error Decoder
Decode API error messages, HTTP codes, JSON error payloads, and headers into likely causes and next debugging steps.
Paste an API error or load the sample to begin.