jstruct-mcp

MCP (Model Context Protocol) server for jstruct - JSON structure extraction for LLMs.

Installation

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "jstruct": {
      "command": "npx",
      "args": ["-y", "jstruct-mcp"]
    }
  }
}

Config file location:

• Windows: %APPDATA%\Claude\claude_desktop_config.json
• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

Global Install

npm install -g jstruct-mcp

Tools

jstruct_extract

Extract JSON structure by collapsing arrays and truncating strings.

Parameters: | Name | Type | Default | Description | |------|------|---------|-------------| | json_input | string | - | JSON string to process | | file_path | string | - | Path to JSON file (alternative) | | array_limit | number | 1 | Array items to retain | | string_limit | number | 64 | Max string length | | compact | boolean | false | Compact output |

jstruct_analyze

Analyze JSON and return structure statistics.

Parameters:

• json_input or file_path

Returns: Analysis report with depth, counts, and collapsed schema.

Example

In Claude:

Use jstruct_extract on this: {"users": [{"id": 1}, {"id": 2}], "total": 2}

Output:

{
  "users": [{"id": 1}],
  "total": 2
}

Requirements

• Node.js >= 18
• jstruct binary (bundled or in PATH)

License

MIT