JWT Decoder & Verifier
Analyze JWT (JSON Web Token) tokens, view their content and check their validity.
Signature Algorithm
Header
Header contains the token type and the hash algorithm used.
Payload
Payload contains the actual data within the token. User information and validity period data are found here.
Signature
Signature is used to verify that the token has not been tampered with. Header and payload are signed using a secret key.
Note: Signature verification requires a secret key on the server side. This tool only parses the token.
JWT Decoder & Token Analyzer
Decode, analyze, and validate JSON Web Tokens (JWT) with detailed header and payload inspection. Essential for debugging authentication systems and API security.
Token Decoding
Decode JWT tokens to reveal header, payload, and signature components with syntax highlighting.
Security Analysis
Analyze token expiration, algorithm compatibility, and security best practices validation.
Time Validation
Check token validity periods with issued at (iat), expires at (exp), and not before (nbf) claims.
Authentication Applications
- API Authentication
Debug JWT tokens used in REST API and GraphQL authentication flows
- OAuth & SSO Systems
Analyze tokens from OAuth providers and Single Sign-On implementations
- Microservices Security
Validate service-to-service authentication tokens in distributed systems
- Mobile App Integration
Debug authentication tokens in mobile applications and native apps
JWT Structure & Algorithms
🔐 JWT Security Best Practices
• Use strong signing algorithms
Prefer RS256 over HS256 for production systems
• Set appropriate expiration times
Short-lived tokens reduce security risks
• Validate all token claims
Check iss, aud, exp, and custom claims
• Never store sensitive data in payload
JWT payload is only encoded, not encrypted