Notion Common Errors

Overview

Quick reference for all Notion API error codes with exact HTTP statuses, error bodies, and fixes. The API returns errors as JSON with three fields:

{
  "object": "error",
  "status": 400,
  "code": "validation_error",
  "message": "Title is not a property that exists."
}

All requests require Authorization: Bearer <token> and Notion-Version: 2022-06-28 headers.

Prerequisites