JWT decode

Decode a JWT without verification: header, payload, expiry status, and time remaining. (Decoding only — signatures are NOT verified.)

Input

Field	Type	Description
token *	string	The JWT string

Example output

{
  "header": {
    "alg": "HS256"
  },
  "payload": {
    "sub": "123",
    "exp": 1760000000
  },
  "expired": false,
  "expiresInSeconds": 3600
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/jwt-decode \
  -H "Content-Type: application/json" \
  -d '{"token":"eyJhbGciOi…"}'

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/jwt-decode", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "token": "eyJhbGciOi…"
  }),
});

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