JWT Decoder

live Utility

Decode a JSON Web Token offline (keyless): header, payload, and standard claims (exp/iat/nbf as dates, expiry status, alg, kid). Decodes only — does NOT verify the signature.

1 tools
0ms auth
free tier 50 calls/day

Tools

decode_jwt

Decode a JSON Web Token (keyless, offline): returns the header and payload JSON plus a summary of the standard claims (iss, sub, aud, exp/iat/nbf as ISO dates, and whether it is expired). NOTE: this d

No parameters required.

▶ Try it

Test with curl

The gateway speaks JSON-RPC 2.0 over HTTP POST. You can test any pack directly from the terminal.

List available tools
bash 
curl -X POST https://gateway.pipeworx.io/jwt/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
Call a tool
bash 
curl -X POST https://gateway.pipeworx.io/jwt/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"decode_jwt","arguments":{}}}'

Use with the SDK

Install @pipeworx/sdk to call tools from any TypeScript/Node project.

TypeScript 
import { Pipeworx } from '@pipeworx/sdk';
const px = new Pipeworx();
const result = await px.call("decode_jwt", {});
ask_pipeworx 
// Or ask in plain English:
const answer = await px.ask("decode a json web token offline (keyless): header, payload, and standard claims (exp/iat/nbf as dates, expiry status, alg, kid)");