JWT Decoder
JWT Token Input
No token provided
About JWT Decoder
Professional JWT (JSON Web Token) decoder and validator with header and payload analysis, signature verification, and expiration checking for security analysis and debugging. All processing happens locally in your browser for privacy.
JWT tokens are fundamental to modern authentication and authorization systems. This tool is essential for developers, security professionals, and DevOps engineers working with token-based authentication.
- Token Validation: Decode and validate JWT structure, format, and encoding
- Header Analysis: Examine algorithm, token type, and signing method details
- Payload Inspection: View claims, expiration times, and user data within tokens
- Security Analysis: Check token expiration, issuer, audience, and timing claims
- Debugging Support: Identify malformed tokens and validation errors for troubleshooting
Security Notice
- This tool is for debugging and development only
- Never use client-side JWT validation for authentication decisions
- Always verify JWT signatures and claims server-side
- All JWT processing happens locally in your browser - no data is transmitted
- Treat JWT payloads as public information - never store secrets in them