Json Diff API

POST https://api.findutils.com/api/tools/json-diff/execute

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.

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Request body

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
  }
}

curl -X POST https://api.findutils.com/api/tools/json-diff/execute \
  -H "Content-Type: application/json" \
  -d '{
    "left": "{\"a\":1,\"b\":2}",
    "right": "{\"a\":1,\"b\":3}"
  }'

const response = await fetch('https://api.findutils.com/api/tools/json-diff/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"left":"{\"a\":1,\"b\":2}","right":"{\"a\":1,\"b\":3}"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/json-diff/execute",
    json={"left":"{\"a\":1,\"b\":2}","right":"{\"a\":1,\"b\":3}"},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/json-diff/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"left":"{\"a\":1,\"b\":2}","right":"{\"a\":1,\"b\":3}"}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call json_diff from Claude, Cursor or any MCP client. Same arguments, same output.

https://mcp.findutils.com

MCP reference

Rate limit: 60 a minute, per IP
Auth: None
REST id: json-diff
MCP name: json_diff
Category: Data
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

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