Using Google Service Account with HTTP Request Node – JWT/RS256 Issue

Questions
1

Hi all,

I’m using n8n Cloud (v1.101.1) and working with the Google Chat API. The built-in Google nodes in n8n don’t cover all the operations I need—for instance, I want to create spaces and reply to specific message threads.

Therefore, I’m trying to use the HTTP Request node instead, authenticating via a Google Service Account. However, I’m running into this error:

secretOrPrivateKey must be an asymmetric key when using RS256

From what I understand, the JWT creation and signing process (needed to get the OAuth2 access token) is handled internally only by the Google nodes. When I try to authenticate via HTTP Request node using my Service Account JSON credentials directly, it seems like that JWT signing logic isn’t executed, hence the error.

My questions are:

  • Is it true that the Google credentials in n8n only integrate with the native Google nodes and don’t automatically apply to HTTP Request nodes?
  • Is there any way to make HTTP requests to Google APIs (like Google Chat) using my Service Account in n8n, via the HTTP Request node method?
  • Alternatively, do I need to generate the JWT and fetch the access token and set it in the HTTP headers?

Any guidance or examples would be much appreciated!

Thanks in advance.

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