Notion HTTP Request node: cannot create page with relation from another database

Questions
1

Describe the problem/error/question

Hey, I’m running into an issue with a Notion + n8n workflow where:

  1. My HTTP Request node complains: JSON parameter needs to be valid JSON, and

  2. When it runs “successfully,” the new Notion page is created but the relation property is empty, even though I’m passing a property ID from the get a Database node.

    We’re automating a Google Drive → Notion data ingestion and relational linking workflow.

    Goal is to create a fully automated sync between exported performance data and Notion databases — so each new performance report automatically updates Notion with structured data and proper relations to existing video records.

What is the error message (if any)?

Please share your workflow

Share the output returned by the last node

Information on your n8n setup

  • n8n version:
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app):
  • Operating system:
3

Try this JSON content for your HTTP request and set the mode to Expression:

{
  "page_size": 1, 
  "filter": { 
    "property": "{{$json.properties['Video link'].id}}", 
    "url": { 
      "contains": "{{ $json.id }}" 
    }
  }
}