JSON diff

Deep-compare two JSON values. Returns a list of changed/added/removed paths (capped at 1000 differences).

Input

Field	Type	Description
a *	any	First JSON value
b *	any	Second JSON value

Example output

{
  "equal": false,
  "differences": [
    {
      "path": "y",
      "type": "changed",
      "a": 2,
      "b": 3
    },
    {
      "path": "z",
      "type": "added",
      "b": 4
    }
  ]
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/json-diff \
  -H "Content-Type: application/json" \
  -d '{"a":{"x":1,"y":2},"b":{"x":1,"y":3,"z":4}}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/json-diff", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "a": {
      "x": 1,
      "y": 2
    },
    "b": {
      "x": 1,
      "y": 3,
      "z": 4
    }
  }),
});

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