mcp-json-tools

An MCP (Model Context Protocol) server that provides JSON and data manipulation tools for AI agents. Designed for use with Claude Code, Claude Desktop, and any MCP-compatible client.

| Tool | Description | |------|-------------| | json_validate | Validate JSON data against a JSON Schema, returning detailed errors with paths | | json_diff | Compare two JSON objects, showing additions, removals, and changes with paths | | json_transform | Transform JSON with pick, rename, flatten, and unflatten operations | | csv_to_json | Convert CSV text to a JSON array with configurable headers, delimiters, and type casting | | json_to_csv | Convert a JSON array of objects to CSV text | | yaml_to_json | Convert YAML text to JSON | | json_to_yaml | Convert JSON text to YAML |

npm install
npm run build

claude mcp add json-tools -- node D:/products/mcp-servers/mcp-json-tools/dist/index.js

Add the following to your Claude Desktop configuration file:

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

{
  "mcpServers": {
    "json-tools": {
      "command": "node",
      "args": ["D:/products/mcp-servers/mcp-json-tools/dist/index.js"]
    }
  }
}

Validate JSON data against a JSON Schema. Returns a valid boolean and an array of errors, each with the field path, message, and schema keyword that failed.

Parameters:

• data (string) — JSON data to validate
• schema (string) — JSON Schema to validate against

Compare two JSON objects and produce a structured diff. Each difference includes the dot-notation path, the type of change (added, removed, or changed), and the old/new values.

Parameters:

• original (string) — Original JSON object
• modified (string) — Modified JSON object