Google Cloud Vision extract from PDF Error

I want to extract data from a PDF, but the HTTP Request node throws an error.

I want to extract data from a PDF using AI because my PDF doesn’t contain a text layer.

At first, I worked with Mistral, but it only captured about one third of the data.
Now I’d like to try Google Cloud Vision instead, and for that I used an example workflow.

The example workflow works with images, but I need to adapt it for PDFs.
When I try with an HTTP Request node, I always get the error that a JSON parameter is missing.
I don’t know what exactly I need to change in the request so that it works.

Could someone please help me?

Error message: JSON parameter needs to be valid JSON

Please share your workflow

Information on your n8n setup

  • n8n version: 1.108.2
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Win10 VM):
  • Operating system: WIn10

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