n8n Sub-Workflow: Summarize Text with Google Gemini JSON

Summarize any text in n8n with Google Gemini—returns consistent JSON for automation

This n8n sub-workflow takes text from another workflow, sends it to Google Gemini for summarization, and returns a predictable JSON response with a plain-language summary, bullet points, tone, confidence, and clear error handling.

What this workflow does

• Receives input from a calling workflow: the text to summarize plus optional parameters for language, audience, and maxWords.
• Applies defaults when inputs are missing and calculates basic metadata (such as character count) for the calling workflow.
• Validates early: if no text is provided, it stops and returns a structured error response.
• Summarizes with Google Gemini: sends the provided text and summarization instructions to the Gemini Chat Model to produce:
  • a summary in the requested style
  • 3–5 bullet points
  • tone and confidence
• Parses and normalizes output into a consistent response object, including bulletText and metadata so downstream steps can reliably consume it.

Use cases

• Generate concise summaries of long articles, support tickets, or emails before posting to internal dashboards.
• Create consistent brief updates (summary + bullets) for SaaS customer communications or operational runbooks.
• Build n8n workflows that adapt summaries by language, audience, and maxWords without rewriting prompting logic.
• Implement robust error handling when upstream sources fail to provide text.

Technical details

• Uses Google Gemini (PaLM) via the Google Gemini Chat Model node with a configured API credential.
• Includes logic nodes such as if and code to handle defaults, validation, and JSON normalization.
• Designed as an Execute Workflow Trigger sub-workflow so other n8n workflows can call it and map inputs/outputs.