The Base API uses conventional HTTP response codes to indicate the success or failure of an API request. In general, codes in the 2xx range indicate success, codes in the 4xx indicate an error with the provided information (errors with the information provided), and codes in the 5xx range indicate a server-side error.


An error response should specify the Content-Language of the response and have Content-Type set to the application/json; charset=utf-8 value.


The general format of an error’s envelope includes two fields: errors and meta. They are described below in a separate subsection.

Errors Attributes

The errors attribute is a JSON collection of objects that holds error information and related metadata, such as links to related documentation. Each error object can hold additional metadata in the meta object.

Error object represent either an invalid request error or a resource error.

The error fields are described below:

Name Description
code The error code.
message Human readable error description in a language specified by the Content-Language header.
details An optional detailed descriptive text targeted at the client developer in English.
resource An optional resource name the error relates to. Present only if the error represents a resource error.
field An optional field name of the resource the error relates to, in the JSON Pointer format. Present only if the error represents a resource error.

Meta Attributes

Name Description
http_status HTTP status code of the response plus HTTP response status message.
logref Unique id of the request. This is the same value as the X-Request-Id header.
links/more_info An optional link to resources that can be helpful in solving the issue.

Invalid request error codes summary

Code Description
not_found Resource you are looking for was not found.
incorrect_path Requested path was not found.
unauthorized Required access token is missing, malformed, expired, or invalid.
insufficient_scope The request requires higher access privileges than those provided by the access token.
rate_limit_exceeded The api rate limit was exceeded. Contact Base Support in order to change the rate limits for your account.
invalid_param A request query parameter is malformed, missing, or has an invalid value
invalid_header A header is malformed, missing, or has an invalid value.
invalid_payload Unexpected token found when parsing the request body.
incorrect_payload The request envelope is malformed, missing, or has an invalid value.
server_error The authorization server encountered an unexpected condition which prevented it from fulfilling the request.
temporarily_unavailable The authorization server is currently unable to handle the request due to maintenance or temporary overload.

Resource error codes summary

Code Description
unknown An attribute is not a known attribute for the resource.
missing A required attribute must be present in the request.
already_exists A resource with an attribute value already exists.
blank An attribute can’t be blank (neither null nor empty).
invalid_type An attribute has an invalid type.
incorrect_value An attribute value is incorrect e.g. is too long, has an invalid format etc.

Full example

  "errors": [{
    "error": {
      "resource": "Contact",
      "field": "/data/last_name",
      "code": "blank",
      "message": "attribute can't be blank",
      "details": "The attribute '/data/last_name' can't be blank (neither null nor empty)."
    "meta": {
      "links": {
        "more_info": ""
  "meta": {
    "http_status": "422 Unprocessable Entity",
    "logref": "b4bce554-8df2-48b1-9f68-a88e741463f0",
    "links": {
      "more_info": ""

HTTP status codes summary

Code Message Meaning
200 OK Everything worked as expected. The response includes a non empty body.
201 Created Everything worked as expected. Returned instead of 200 if your operation creates a new resource.
202 Accepted Everything worked as expected. The request has been accepted for future processing. Used by asynchronous APIs.
204 No Content Everything worked as expected. The response includes an empty body.
301 Moved Permanently The resource you are looking for has been moved somewhere else.
304 Not Modified The requested resource has not changed. Returned only if If-None-Match or If-Modified-Since headers were used in the request.
400 Bad Request Returned whenever the request is missing required information or is malformed in another way, e.g. the payload is malformed.
401 Unauthorized The API consumer credentials are invalid, e.g. the API key is revoked or the username or password is invalid.
402 Payment Required Subscription payment is required.
403 Forbidden The request has been refused because of insufficient user access privileges.
404 Not Found The requested resource could not be found.
405 Method Not Allowed The API consumer tried to access an endpoint with an invalid HTTP method, e.g. using PUT on a read-only resource.
406 Not Acceptable The API consumer requested a format that the server cannot produce - an invalid Accept header.
409 Conflict The request could not be completed due to a conflict with the current state of the resource. This code is only allowed in situations where it is expected the user might be able to resolve the conflict and resubmit the request.
415 Unsupported Media Type The API consumer used an unsupported media type in the Content-Type or Content-Encoding headers.
422 Unprocessable Entity The request is well-formed but cannot be processed due to semantic issues with the payload, e.g. some required fields are missing.
429 Too Many Requests The rate limit was exceeded and access is temporarily blocked.
500, 502, 503, 504 - Something went wrong on Base’s end.