Unless otherwise specified, most HubSpot APIs will return a 200 OK response on success. Any endpoints returning a different status code will specify the returned response on its documentation page.

In addition, HubSpot has several error responses that are common to multiple APIs:

• 401 Unauthorized - Returned when the authentication provided is invalid. See our Authentication Overview for details on authenticating API requests.
• 403 Forbidden - Returned when the authentication provided does not have the proper permissions to access the specific URL. As an example, an OAuth token that only has content access would get a 403 when accessing the Deals API (which requires contacts access).
• 429 Too many requests - Returned when your account or app is over its API rate limits. Find suggestions on working within those limits here.
• 502/504 timeouts - HubSpot has processing limits in place to prevent a single client from causing degraded performance, and these responses indicate that those limits have been hit. You'll normally only see these timeout responses when making a large number of requests over a sustained period. If you get one of these responses, you should pause your requests for a few seconds, then retry.

Aside from these general errors, HubSpot error responses are intended to be human-readable. Most endpoints do not return error codes, but return a JSON formatted response with details about the error.

Note: The fields in the example response below should all be treated as optional in any error parsing. The specific fields included can vary between different APIs, so any error parsing should allow for specific fields to be missing from the response.

{
  "status": "error",
  "message": "This will be a human readable message with details about the error.",
  "errors": [
    {
      "message": "This will be a message with additional details about the error",
      "in": "name"
    }
  ],
  "category": "VALIDATION_ERROR",
  "correlationId": "a43683b0-5717-4ceb-80b4-104d02915d8c"
}

More details for endpoint specific errors can be found on the documentation pages for the endpoint.