JWT Token Decoder & Debugger - Decode and Analyze JSON Web Tokens
Professional JWT debugging tool for developers and security professionals. Decode, verify, and analyze JSON Web Tokens with detailed header and payload inspection. Features include signature verification, claims validation, expiration checking, and algorithm analysis. Privacy-focused - all token processing happens in your browser, tokens are never stored or transmitted.
Key Features
- Complete JWT token decoding with header and payload analysis
- Signature verification and algorithm detection
- Claims inspection with automatic type recognition
- Token expiration and validity checking
- Support for all standard JWT algorithms (RS256, HS256, ES256, etc.)
- Real-time decoding as you type
- Privacy-safe - tokens never leave your browser
- Copy decoded sections to clipboard
Use Cases
- API authentication debugging
- OAuth and OpenID Connect token analysis
- JWT implementation testing and validation
- Security auditing and token inspection
- Development and troubleshooting JWT workflows
- Educational purposes for understanding JWT structure
JWT Debugger
Decode and inspect JWT tokens. Paste your token to see the decoded header and payload with all claims.
Security Notice: For debugging only - Never paste production tokens containing sensitive data. All processing happens client-side; no tokens are sent to servers.
JWT Token
Paste your JWT token (header.payload.signature format)
Header
Header will appear here when a valid JWT is entered
Payload
Payload will appear here when a valid JWT is entered
Signature Status
Signature status will appear here when a valid JWT is entered
Signature
Signature will appear here when a valid JWT is entered