Response

API response is JSON formatted and it has Content-Type: application/json header.

HTTP status codes

MailerLite uses standard HTTP response codes.

HTTP code		Description
200	OK	The request succeeded.
201	Created	The request was fulfilled and resulted in a new resource being created.
204	No Content	The server fulfilled the request but does not need to return an entity-body, i.e. when resource is deleted.
400	Bad Request	The request could not be understood by the server due to malformed syntax.
401	Unauthorized	The request requires user authentication.
404	Not Found	The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.
500	Internal Server Error	The server encountered an unexpected condition which prevented it from fulfilling the request.

Every error has the structure described below.

Parameter	Type	Description
error	`Object`	Object that contains data about error
error.code	`Integer`	Optional Code of error
error.message	`String`	Readable message about the error occurred

{
  "error": {
    "code": 123,
    "message": "Group not found"
  }
}

Error code	Message	Description
1	Unauthorized	API key is required and is not provided
2	Endpoint not found	The endpoint you are trying to use is non-existing
302	API-Key Unauthorized	You are trying to use an invalid API key to authorize
429	Too many requests	You reached the API rate limit