JWT Decoder
Decode and verify JSON Web Tokens (JWT). Analyze headers, payloads, and signatures.
JWT Options
JWT Token Input
JWT Structure:
header
.
payload
.
signature
Decoded JWT
Ready to decode
Paste a JWT token above to decode and analyze it
JWT Information
JWT Structure
Header: Algorithm and token type
Payload: Claims and data
Signature: Verification signature
Format: Base64URL encoded
Standard Claims
iss: Issuer
sub: Subject
aud: Audience
exp: Expiration time
iat: Issued at
Security Notes
• Never expose secret keys
• Validate signatures in production
• Check expiration times
• Use HTTPS for token transmission