Compare JSON

by unitstack

176 downloads

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About

A lightweight, dependency-free MCP for deep comparison of JSON values. Detects additions, deletions, type changes, and value changes between two JSON structures with fine-grained control over comparison behavior.

Details

Author: unitstack
Downloads: 176
Categories: Developer Tools

- compare_json tool with multiple input options (raw, string, file path).
- Configurable array comparison: byIndex, lcs, or unordered.
- Case‑insensitive key and value comparison toggles.
- Numeric‑string equals number comparison option.
- Returns an array of JSONValueDifference objects with path and diff type.

Setting up with Highlight

This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:

Download and install Highlight from highlightai.com/download
Navigate to the plugins tab and select "Add Custom Plugin"
Configure the plugin with the settings below

Plugin Name Compare JSON

Command (node, npx, python, etc.)

Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
Enable "Start Automatically" if you want the plugin to start when Highlight launches

Setting up with Cursor

Open Cursor's settings
Navigate to the MCP section
Click "Add new Global MCP server"
Copy and paste the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

Setting up with Claude Desktop

Open Claude Desktop's settings
Go to the Integrations tab
Click "Add MCP Server"
Use the configuration below based on your operating system

Note: Make sure Claude Desktop is running before attempting to connect.

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

Setting up with Windsurf

Open Windsurf's preferences
Go to the Integrations section
Click "Add MCP Integration"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

Setting up with Cline

Open Cline's settings
Navigate to the Integrations section
Click "Add MCP Server"
Copy and paste the configuration below based on your operating system

Note: Make sure to restart Cline after adding the configuration.

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

Setting up with Goose

Open Goose's preferences
Go to the Integrations tab
Select "MCP Servers"
Click "Add New Server"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

From the repository

Start the server by running compare-json --mcp from a global install or npx @compare-json/cli --mcp. It communicates over stdio. Add the provided configuration to your MCP client (e.g., mcp.json) to register the compare-json server.

`compare_json`

Compare two JSON values and return differences. Supports various comparison options including comparisons case-insensitive comparisons, and numeric string handling.

Claude Desktop / Cursor

Paste into your MCP client config file to install this server.

{
    "mcpServers": {
        "compare json": {
            "compare-json": {
                "command": "npx",
                "args": [
                    "@compare-json/cli@latest",
                    "--mcp"
                ]
            }
        }
    }
}

McpServers

{
    "compare-json": {
        "command": "npx",
        "args": [
            "@compare-json/cli@latest",
            "--mcp"
        ]
    }
}

MCP Server

@compare-json/cli also ships an MCP (Model Context Protocol) server that exposes the comparison engine as a tool for AI assistants.

Online Playground

Try it out at https://comparejson.com

Start the MCP Server

bash
from a global install

compare-json --mcp

or via npx

npx @compare-json/cli --mcp



The server communicates over stdio.

Available Tools

compare_json



Compare two JSON values and return their differences.

Input parameters:

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
|

baseJSON | any

 | conditional | Base JSON value (already parsed). |
|

baseJSONString | string

 | conditional | Base JSON as a stringified value (parsed by the server). |
|

baseJSONFilePath | string

 | conditional | Path to a base JSON file (read and parsed by the server). |
|

contrastJSON | any

 | conditional | Contrast JSON value (already parsed). |
|

contrastJSONString | string

 | conditional | Contrast JSON as a stringified value. |
|

contrastJSONFilePath | string

 | conditional | Path to a contrast JSON file. |
|

options | object

 | No | Comparison options (see below). |

At least one of

baseJSON / baseJSONString / baseJSONFilePath must be provided, and at least one of contrastJSON / contrastJSONString / contrastJSONFilePath

. When more than one is set for a side, file path takes precedence, then string, then raw value.

Options:

| Option | Type | Default | Description |
|--------|------|---------|-------------|
|

arrayCompareMethod | 'byIndex' \| 'lcs' \| 'unordered' | 'byIndex'

 | Array comparison strategy. |
|

keyCaseInsensitive | boolean | false

 | Case-insensitive key comparison. |
|

valueCaseInsensitive | boolean | false

 | Case-insensitive value comparison. |
|

numericStringEqualsNumber | boolean | false

 | Treat numeric strings as equal to numbers. |

Output:

Returns

structuredContent.differences — an array of JSONValueDifference objects — and a content[0].text

 mirror of the same data as JSON text.

json
{
  "differences": [
    {
      "pathSegments": ["name"],
      "pathString": "name",
      "pathBelongsTo": "both",
      "diffType": "valueChanged"
    }
  ]
}



MCP Client Configuration


Add the following to your MCP client config (e.g.

mcp.json

):

json
{
  "mcpServers": {
    "compare-json": {
      "command": "npx",
      "args": ["@compare-json/cli@latest", "--mcp"]
    }
  }
}

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Compare JSON

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Setting up with Highlight

Setting up with Cursor

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Setting up with Claude Desktop

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Setting up with Windsurf

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Setting up with Cline

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Setting up with Goose

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From the repository

`compare_json`

Claude Desktop / Cursor

McpServers

MCP Server

Online Playground

Start the MCP Server

from a global install

or via npx

Available Tools

compare_json

MCP Client Configuration

Install

About

Details

Jump to

Setting up with Highlight

From the repository

compare_json

Claude Desktop / Cursor

McpServers

MCP Server

Online Playground

Start the MCP Server

from a global install

or via npx

Available Tools

compare_json

MCP Client Configuration

Install

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