1. Sign up to Flow & ChatGPT

2. Create a Project in ChatGPT

  1. Open ChatGPT.
  2. In the left sidebar, click Projects → New Project.
  3. Name your project: VEO3 JSON Prompts.
  4. This keeps all your templates, examples, and instructions organized in one place.

3. Add Custom Instructions

Inside your Project, set Custom Instructions so ChatGPT always knows what to do.

Copy and paste this into Custom Instructions → “How would you like ChatGPT to respond?”

VEO3 Project Custom Instructions

4. Generate a JSON Prompt

Now when you chat inside this Project, you can type something like:

“Make a JSON where the World Cup trophy turns into a stadium full of fans.”

ChatGPT will reply with valid JSON ready to paste into VEO3.