Simple-Dev-ToolsHello.World Consulting

Security & Tokens

Decode and verify JWTs (HS256/RS256/ES256), compute hashes, and generate HMACs using Web Crypto — no secrets leave the browser.

All operations run locally in your browser. Do not paste production secrets or private keys.

JWT

Secret (HS256)

Public Key (PEM SPKI or JWK JSON) for RS256/ES256

(decode to view)

(decode to view)