When an unsuccessful request is made, in LogicMonitor REST API v2 and v3, the response body will contain an errorCode field with one of the following codes:

HTTP Status Code	API v2 & v3 Error Code	Description
202	1202	The request has been accepted for processing, but the processing has not been completed.
400	1400	Bad request (resource cannot be deleted because something else is dependent on it)
401	1401	Authentication failed
403	1403	Authentication succeeded; permission denied.
404	1404	No such resource
409	1409	The resource already exists
412	1412	A precondition was not met (two factor authentication)
413	1413	Request entity too large (the report is too large to generate)
429	1429	Too many requests (exceeded rate limits)
500	1500	Internal error

Along with a data object, the response body contains a ‘status’ field which should display one of the following codes for v1 of the API:

Status Code	Description
200	Success
1201	The update was partially successful.
600	The record already exists.
1041	RBAC issue
1403	Two-factor authentication is required.
403	Authentication failure
2403	User must enable two-factor authentication
3403	Incorrect password
1001	Internal error
1007	Request failed – possibly due to duplicate records
1069, 500	No such record
1013, 1004, 1015, 1022, 1027, 1033, 1037, 1060, 1058, 1048	No such Device DataSource, Device Group, Instance Group, DataSource, Instance, Collector, Datapoint, Widget, SDT
1101	Query timed out
1010	Device Group was not deleted
1014	Instance group cannot be created
1301	Save failed
1074	Report too large
1073	Collector is down
1040	Import DataSource failed