ipIterPrompt

Control output format (JSON mode)

A community prompt for control output format (json mode), imported from awesome-claude-prompts (MIT).

langgptai · awesome-claude-promptsUpdated 2026-07-082,769 copies

Control output format (JSON mode) is a community-contributed prompt from awesome-claude-prompts (MIT). Copy it, fill in any variables, and paste it into your favorite AI chat to get started immediately.

The prompt

check: https://docs.anthropic.com/claude/docs/control-output-format

> Prefilling the response with an open bracket can help. Add "Do not output preamble or explanations." and it follows it pretty well.

Try it out

Open in Playground →

Run this prompt on a real model without leaving the page. Every run is saved to your history for this prompt.

How to use

  1. 1Copy the prompt as-is — no variables required.
  2. 2Paste it into ChatGPT, Claude, Gemini, or any capable model.
  3. 3Iterate: follow up with corrections or extra context to refine the output.

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