JSONGen
Describe your scene in plain language. Get a professional, high-quality structured AI prompt instantly — 100% free and optimized for Nano Banana and Kling.
// Output will appear here...
JSON prompts provide a mathematical structure to creativity. Unlike natural language, which can be ambiguous, JSON forces the AI to acknowledge every specific parameter independently.
By separating the Subject from the Environment and Lighting, you eliminate "concept bleeding" where colors or styles from one part of your prompt infect others.
Want to change just the lighting? Simply edit the lighting value. Want to swap the camera angle? Change the camera key. No need to rephrase your entire description.
Once you've generated your prompt, you can manually fine-tune the JSON before pasting it into your AI generator. Here's how to maximize your results:
description or appearance to change physical traits without affecting the background.details array to add or remove specific objects from the scene.meta block to lock in aspect ratios or specific rendering resolutions across different versions.