Json Promptor

An MCP server that converts raw text prompts into structured JSON prompts using heuristic keyword extraction — no API keys required.

Tools

convert_prompt_to_json

Takes a raw text prompt and returns a structured JSON object with extracted fields:

• purpose — what the prompt is trying to achieve
• goal — the specific desired outcome
• audience — who the output is for
• context — background information or constraints
• tone — desired tone/style (formal, casual, technical, etc.)
• instructions — step-by-step directions found in the prompt
• format — desired output format (list, paragraph, code, etc.)
• original_prompt — the raw input preserved as-is

edit_prompt_json

Takes an existing structured JSON prompt, a field name, and a new value. Returns the updated JSON.

Build

npm install
npm run build

MCP Config for Kiro

Add to your mcp.json:

{
  "mcpServers": {
    "json-promptor": {
      "command": "node",
      "args": ["json-promptor-mcp/dist/index.js"]
    }
  }
}

Example

Input prompt:

Write a formal blog post for developers explaining how to use Docker, as a numbered list.

Output:

{
  "purpose": "write a formal blog post for developers explaining how to use docker, as a numbered list",
  "goal": "",
  "audience": "developers",
  "context": "",
  "tone": "formal",
  "instructions": "",
  "format": "numbered list",
  "original_prompt": "Write a formal blog post for developers explaining how to use Docker, as a numbered list."
}