JSON to CSV

Convert a JSON array of objects to CSV. Nested objects are flattened to dot-path columns.

Input

Field	Type	Description
json *	any	Array of objects (or a JSON string of one)
delimiter	string	Default ,

Example output

{
  "csv": "name,role.title\nAda,Engineer\n",
  "rows": 1,
  "columns": 2
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/json-to-csv \
  -H "Content-Type: application/json" \
  -d '{"json":[{"name":"Ada","role":{"title":"Engineer"}}]}'

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-to-csv", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "json": [
      {
        "name": "Ada",
        "role": {
          "title": "Engineer"
        }
      }
    ]
  }),
});

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