JWT Decoder Online
Decode JSON Web Tokens (JWT) to view header, payload, and signature. Check token expiration and validate JWT format. Free, secure, and privacy-first.
Decoded JWT will appear here
Enter a JWT token above to decode it
About JWT Decoder
This free online tool decodes JSON Web Tokens (JWT) and displays their header, payload, and signature components. Perfect for developers working with authentication and authorization systems.
Key Features
- Complete JWT decoding for header, payload, and signature components
- Token validation to check JWT format and detect expired tokens
- Automatic timestamp conversion from Unix time to readable dates
- Copy individual components or download complete decoded data
- File upload support for JWT tokens from files
- Auto-decode functionality as you type for instant results
- Detailed claim information with explanations
Use Cases
- Authentication debugging and token inspection
- API development and JWT integration testing
- Security analysis and token validation
- Learning JWT structure and understanding claims
- Troubleshooting expired or malformed tokens
- Development workflow optimization for auth systems
Supported Formats
Related Keywords
Security Note
This tool only decodes JWT tokens - it does not verify signatures. Never paste production tokens containing sensitive information into online tools. For signature verification, use server-side validation with the appropriate secret key.
Privacy & Security
All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.