Error codes

Errors are returned as JSON: {"error": {"code": "...", "message": "..."}}.

Code	HTTP status	Meaning
`missing_api_key`	401	No X-Api-Key header or api_key query param was provided.
`invalid_api_key`	401	The API key provided does not match any active key.
`inactive_api_key`	403	The API key exists but has been deactivated.
`rate_limit_exceeded`	429	Too many requests this minute for your tier.
`daily_limit_exceeded`	429	Your tier's daily allowance is used up; it resets at midnight UK time.
`not_found`	404	The requested resource does not exist.
`method_not_allowed`	405	The HTTP method is not supported for this route.
`date_out_of_range`	400	Journey planning has no timetables for the datetime asked for. The message gives the first and last dates that can be planned, about two months ahead.
`outside_coverage`	422	Journey planning doesn't cover that origin or destination (such as the Isle of Man), or they are in separate areas with no connection, such as Great Britain and Ireland.
`planner_unavailable`	503	Journey planning didn't respond in time. Retry after the Retry-After seconds; other endpoints are unaffected.
`internal_error`	500	An unexpected server error occurred.