JSON parameter need to be an valid JSON [item 0]

[bmax911]

My http node has body json that doesn’t accept json inside this. Anyone tried to solve this before

{
  "max_tokens": 100,
  "messages": [
    {
      "content": "{{ $json.prompt }}",
      "role": "user"
    }
  ],
  "model": "gpt-4o-mini",
  "temperature": 1,
  "top_p": 1
}

• **n8n version:self host
• Database (default: SQLite):
• n8n EXECUTIONS_PROCESS setting (default: own, main):
• **Running n8n via Docker
• **Operating system:Window

[n8n]

It looks like your topic is missing some important information. Could you provide the following if applicable.

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

[ria]

Hi @bmax911

Thanks for posting here and welcome to the community!

That looks like a bug… Thanks for reporting this!

Will post here when fixed.

[simon.lewis]

Hey @bmax911

I hit the same problem with JSON within JSON - check out this article for a workaround as it worked great for me:

How to pass json inside a json property - Questions - n8n Community

Short version: you need to construct the whole JSON body as an expression within {{ }} brackets, as part of the HTTP Request node configuration.

Hope that helps you. It saved my bacon !