Json Diff MCP tool

MCP findutils:json_diff

Returns the semantic differences between two JSON documents as a list of added, removed and modified paths with their old and new values, plus counts. Compares structure and values, not text lines; key order is ignored by default.

Needs an API key. Running a tool needs an API key. Keys are not for sale yet: ask for early access. About API keys

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Arguments

application/json

left

string required

The original JSON document (text).
right

string required

The changed JSON document (text).
ignore_key_order

boolean optional

Sort object keys before comparing so key order does not count as a change. Default: true. Default true.
include_unchanged

boolean optional

Also list unchanged leaf paths. Default: false. Default false.

Example arguments

Verified

{
  "left": {
    "a": 1,
    "b": 2
  },
  "right": {
    "a": 1,
    "b": 3
  }
}

claude mcp add findutils --transport http https://mcp.findutils.com/ --header "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

curl -X POST https://mcp.findutils.com/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "json_diff",
      "arguments": {
        "left": "{\"a\":1,\"b\":2}",
        "right": "{\"a\":1,\"b\":3}"
      }
    }
  }'

Also a REST endpoint

The same tool answers plain HTTP at POST /api/tools/json-diff/execute.

REST reference

Rate limit: 120 a minute, per IP
Auth: API key
REST id: json-diff
MCP name: json_diff
Category: Data
Machine-readable: openapi.json · markdown.md

Arguments

Example arguments

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