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Convert natural language to video JSON prompts with GPT and Gemini for Veo 3

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Created by: Khairul Muhtadin || khmuhtadin
Khairul Muhtadin

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Last update 3 days ago

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Turn plain-language video ideas into ready-to-use Veo 3 JSON prompts. This workflow takes your free-text prompt, refines it with Langchain AI and Google Gemini, and returns structured JSON tuned for Veo 3 video generation. No manual formatting, no guessing parameters.

Last updated: September 2026.

Why Use Prompt Converter?

Save time: Complex video prompts become structured JSON automatically. No more manual formatting headaches.

Avoid guesswork: Vague ideas turn into detailed, cinematic descriptions that match Veo 3 specs.

Improve output quality: Every parameter is optimized for Veo 3, so results look realistic and stunning.

Gain a creative edge: Rough concepts become vivid video prompts with AI enhancement.

Perfect For

Video creators: Developers and creators who want quick, precise prompt formatting without coding.

AI enthusiasts: Hobbyists and developers exploring Langchain and Google Gemini for media generation.

Marketing teams: Professionals making video ads or visuals with consistent, time-saving prompt structuring.

How It Works

  • Trigger: You submit a free-text prompt via message or webhook.
  • Process: An AI model reads your text and reworks it into detailed JSON parameters for Veo 3.
  • Smart Logic: Langchain nodes add cinematic detail, set sensible defaults, and structure the data.
  • Output: The refined JSON prompt goes to Google Gemini for video generation with optimized settings.

Quick Setup

  1. Import the JSON file to your n8n instances
  2. Add credentials: Azure OpenAI, Gemini API (AI Studio docs), OpenRouter API
  3. Customize: Adjust prompt templates or default parameters in the Prompt converter node
  4. Test: Run your workflow with sample text prompts to see videos come to life

You'll Need

  • Active n8n instances
  • Azure OpenAI API
  • Gemini API Key
  • OpenRouter API (alternative AI option)

Level Up Ideas

  • Add integration with video hosting platforms to auto-upload generated videos

Nodes Used

  • Prompt Input (Chat Trigger)
  • OpenAI (Azure OpenAI GPT model)
  • Alternative (OpenRouter API)
  • Prompt converter (Langchain chain LLM for JSON conversion)
  • JSON parser (structured output extraction)
  • Generate a video (Google Gemini video generation)

Quick Answers

How do I submit a prompt?
Send free text through a message or a webhook call.
What do I get back?
Structured JSON parameters tuned for Veo 3, ready for video generation.
Which AI services are involved?
Azure OpenAI, Google Gemini, and optionally OpenRouter.

Made by: khmuhtadin
Tags: video generation, AI, Langchain, automation, Google Gemini
Category: Video Production
Need custom work? Contact me

Additional info

Built with n8n. Need an assessment on your business? Feel free to reach out at https://khmuhtadin.com/consultation/