Decode a JWT

$0.003 per call · failed calls are never charged · no account or API key needed

Decode a JSON Web Token's header and payload without verifying the signature, and report issued-at, not-before and expiry as dates and whether it has expired. The token is not stored. Do not use the result to trust a token. Use to debug auth flows.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
token (required)stringThe JWT

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/jwt/decode?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE3OTIyODE2MDB9.sig"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/jwt/decode?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE3OTIyODE2MDB9.sig&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "123",
    "exp": 1792281600
  },
  "expiresAt": "2026-10-18T00:00:00.000Z",
  "expired": true,
  "signatureVerified": false
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is jwt_decode, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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