About This JWT Expiration Checker
Our free JWT expiration checker allows you to decode JSON Web Tokens (JWT) and check their expiration status locally in your browser. JWT tokens are widely used for authentication and authorization in web applications. This tool decodes the Base64URL-encoded header and payload, extracts timestamp claims (exp, iat, nbf), and displays human-readable expiration information. All processing happens client-side with no server communication, making it safe for examining non-production tokens.
Features
Decode JWT tokens locally
Display expiration status (expired or valid)
Show time until expiration or time since expiry
Display issued at (iat) timestamp
Show not before (nbf) timestamp
Pretty-print JSON header and payload
Copy header or payload to clipboard
Human-readable time formatting
All processing done client-side
No server communication
Benefits
Privacy-focused - no tokens sent to server
Instant decoding and analysis
Works completely offline
Free with unlimited use
No registration required
Easy-to-read expiration information
Developer-friendly interface
Mobile-responsive design
Safe for development tokens
Quick debugging tool
Common Use Cases
Check if authentication tokens are expired
Debug JWT token issues in development
Verify token expiration times
Inspect JWT claims and structure
Troubleshoot API authentication
Review token timestamps
Validate token format
Development and testing
Learning about JWT structure
API integration debugging