🔑 JWT Debugger

Decode header & payload, verify HMAC signature, inspect claims — all in your browser

📋 JWT Input

Paste your JWT token

🔐 Signature Verification

Secret / Key

Base64 encoded secret

⚠️ Signature verification for HS256/384/512 uses the Web Crypto API in your browser. RS256/ES256 verification requires PEM public key (coming soon).

Paste a JWT token on the left to decode it