Online JWT Token Decoder & Inspector
Decode and inspect JSON Web Tokens (JWT). Analyze headers, payloads, and verify token structure without requiring the secret key.
JWT Token Input
Paste your JWT token to decode and analyze
Supports .txt and .jwt files
Analysis Options
Sample JWT Tokens
JWT (JSON Web Token) Guide
What is JWT?
JWT is a compact, URL-safe means of representing claims between two parties. It consists of three parts separated by dots: Header.Payload.Signature
Structure
Header: Token metadata (algorithm, type)
Payload: Claims (user data, permissions)
Signature: Verification hash
Standard Claims
iss: Issuer
sub: Subject
aud: Audience
exp: Expiration time
nbf: Not before
iat: Issued at
jti: JWT ID
Common Algorithms
HS256: HMAC with SHA-256
RS256: RSA with SHA-256
ES256: ECDSA with SHA-256
none: Unsecured (not recommended)
Security Best Practices
- Always verify signatures
- Use strong signing algorithms
- Set appropriate expiration times
- Validate all claims
- Store tokens securely
- Use HTTPS for transmission
- Implement proper key management
Common Use Cases
- Authentication & authorization
- Single sign-on (SSO)
- API access tokens
- Information exchange
- Microservices communication
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