🪙 JWT Decoder
Decode and inspect JSON Web Tokens. See header, payload, and signature. Runs entirely in your browser — your token is never sent to a server.
🔤 JWT Token
💡 Try a Sample Token
What is a JWT?
JSON Web Token is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object, signed using a secret or public/private key.
Structure
Header — algorithm & token type.
Payload — claims (sub, exp, iat, etc.).
Signature — verifies token integrity.
Security
JWTs are base64-encoded, not encrypted by default. Never store sensitive data in the payload unless you use JWE (encrypted JWTs).