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

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

Import the JSON file to your n8n instances
Add credentials: Azure OpenAI, Gemini API (AI Studio docs), OpenRouter API
Customize: Adjust prompt templates or default parameters in the Prompt converter node
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/