Error Response

Singpass APIs are RESTful in design and communicate classes of errors based on the HTTP status code. The status code should be used to determine if the error is caused by consumer or provider. Consumers should log the HTTP status code along with the id and/or trace_id of the error.

Http Status	Description
4xx	Errors caused by API consumer. You can expect codes such as 400, 401, 403, 404 etc. if incorrect requests are made to APIs. Example: 400 Bad Request due to invalid/missing request arguments
5xx	Errors caused by API provider or its dependencies. You can expect codes such as 500, 502, 503 etc if there is an issue on Singpass or its dependencies. Example: 500: Internal Server Error due to some kind of programming error.

Example: Invalid Request Parameters

HTTP/1.1 400 Bad Request
Connection: keep-alive
Cache-Control: no-cache, no-store, must-revalidate
Transfer-Encoding: chunked
Content-Type: application/json
Date: Thu, 26 Sep 2024 03:36:41 GMT
Content-Length: 190

{
  "id" : "bcba4bc3-534e-4891-bfa2-e872b4502d80",
  "error" : "CLIENT_SIDE_ERROR",
  "error_description" : "This is an invalid request.",
  "trace_id" : "66f4d6c93a23476106150eb7c40d7dc9"
}

Example: Server Error

HTTP/1.1 500 Internal Server Error
Cache-Control: no-cache, no-store, must-revalidate
X-XSS-Protection: 0
X-Frame-Options: DENY
Date: Thu, 26 Sep 2024 03:36:41 GMT
Connection: keep-alive
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
X-Content-Type-Options: nosniff
Transfer-Encoding: chunked
Content-Type: application/json
Content-Length: 192

{
  "id" : "bcba4bc3-534e-4891-bfa2-e872b4502d80",
  "error" : "SERVER_SIDE_ERROR",
  "error_description" : "An unexpected error occurred.",
  "trace_id" : "66f4d6c97ef952fbff9f2d20f6b826f9"
}

Path	Type	Description
id	String	The unique identifier for this error/request. Please log this identifier for support and debugging purposes.
trace_id	String InstanceOfAssertFactory	(Optional) An auxiliary id for request correlation across services. Please also log this identifier for operational support and debugging purposes.
error	String	Error code representing broad class of error; likely to be one of CLIENT_SIDE_ERROR, ARGUMENTS_NOT_VALID, SERVER_SIDE_ERROR, TOO_MANY_REQUESTS. However, specific error codes can be returned for some endpoints, in which case you may find more details in the documentation for that endpoint.
error_description	String	Returns human readable general information about the reason for the error. Note that due to security reasons; detailed information is unlikely to be available in this message.