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

⚡ 2,622 views · 🎬 Content Creation & Video

Description

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/

🔗 Nodes Used

Basic LLM Chain, Structured Output Parser, Chat Trigger, Azure OpenAI Chat Model, OpenRouter Chat Model, Google Gemini

📥 Import

Download workflow.json and import into n8n: Workflow menu → Import from File

📖 Importing guide · 🔑 Credential setup