JSON MCP Server

A JSON Model Context Protocol (MCP) server implementation for querying and manipulating JSON data. This server enables LLMs to interact with JSON data through a set of standardized tools.

Installation & Usage

# Using npx with specific version (recommended)
npx @gongrzhe/[email protected]

# Install specific version globally
npm install -g @gongrzhe/[email protected]

# Run after global installation
server-json-mcp

Components

Tools

• query
• Query JSON data using JSONPath syntax with extended operations

• Input:

  • url (string): URL of the JSON data source
  • jsonPath (string): JSONPath expression with optional operations

• filter

• Filter JSON data using conditions
• Input:
  • url (string): URL of the JSON data source
  • jsonPath (string): Base JSONPath expression
  • condition (string): Filter condition

Supported Operations

Array Operations

• Slicing: $[0:5], $[-3:], $[1:4]
• Sorting: $.sort(price), $.sort(-price)
• Distinct: $.distinct()
• Transformations:
• Map: $.map(fieldName)
• Flatten: $.flatten()
• Union: $.union([1,2,3])
• Intersection: $.intersection([1,2,3])

String Operations

• Case: $.toLowerCase(), $.toUpperCase()
• Tests: $.startsWith('test'), $.endsWith('test')
• Search: $.contains('test'), $.matches('pattern')

Numeric Operations

• Math: $.math(+10), $.pow2()
• Rounding: $.round(), $.floor(), $.ceil()
• Functions: $.abs(), $.sqrt()

Date Operations

• Format: $.format('YYYY-MM-DD')
• Check: $.isToday()
• Modify: $.add(1, 'days')

Aggregation Operations

• Group: $.groupBy(category)
• Stats: $.sum(price), $.avg(price), $.min(price), $.max(price)

Configuration

Usage with Claude Desktop

To use this server with the Claude Desktop app, add the following configuration to your claude_desktop_config.json:

{
  "json": {
    "command": "npx",
    "args": [
      "@gongrzhe/[email protected]"
    ]
  }
}

Alternatively, you can use the node command directly if you have the package installed:

{
  "json": {
    "command": "node",
    "args": [
      "path/to/build/index.js"
    ]
  }
}

Development

Building from Source

1. Clone the repository
2. Install dependencies:

   npm install

3. Build the project:

   npm run build

Notes

1. All JSONPath expressions start with $ representing the root object
2. Array indices are zero-based
3. String values in operations should be wrapped in quotes
4. Date operations support 'days', 'months', and 'years' units
5. Numeric operations support basic arithmetic operators (+, -, *, /)

License

MIT